896 lines
27 KiB
JavaScript
Executable file
896 lines
27 KiB
JavaScript
Executable file
/*global window: false */
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/*global document: false */
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"use strict";
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var color = require('chartjs-color');
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module.exports = function(Chart) {
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//Global Chart helpers object for utility methods and classes
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var helpers = Chart.helpers = {};
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//-- Basic js utility methods
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helpers.each = function(loopable, callback, self, reverse) {
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// Check to see if null or undefined firstly.
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var i, len;
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if (helpers.isArray(loopable)) {
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len = loopable.length;
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if (reverse) {
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for (i = len - 1; i >= 0; i--) {
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callback.call(self, loopable[i], i);
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}
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} else {
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for (i = 0; i < len; i++) {
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callback.call(self, loopable[i], i);
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}
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}
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} else if (typeof loopable === 'object') {
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var keys = Object.keys(loopable);
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len = keys.length;
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for (i = 0; i < len; i++) {
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callback.call(self, loopable[keys[i]], keys[i]);
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}
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}
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};
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helpers.clone = function(obj) {
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var objClone = {};
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helpers.each(obj, function(value, key) {
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if (obj.hasOwnProperty(key)) {
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if (helpers.isArray(value)) {
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objClone[key] = value.slice(0);
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} else if (typeof value === 'object' && value !== null) {
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objClone[key] = helpers.clone(value);
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} else {
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objClone[key] = value;
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}
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}
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});
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return objClone;
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};
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helpers.extend = function(base) {
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var len = arguments.length;
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var additionalArgs = [];
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for (var i = 1; i < len; i++) {
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additionalArgs.push(arguments[i]);
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}
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helpers.each(additionalArgs, function(extensionObject) {
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helpers.each(extensionObject, function(value, key) {
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if (extensionObject.hasOwnProperty(key)) {
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base[key] = value;
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}
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});
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});
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return base;
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};
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// Need a special merge function to chart configs since they are now grouped
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helpers.configMerge = function(_base) {
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var base = helpers.clone(_base);
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helpers.each(Array.prototype.slice.call(arguments, 1), function(extension) {
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helpers.each(extension, function(value, key) {
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if (extension.hasOwnProperty(key)) {
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if (key === 'scales') {
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// Scale config merging is complex. Add out own function here for that
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base[key] = helpers.scaleMerge(base.hasOwnProperty(key) ? base[key] : {}, value);
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} else if (key === 'scale') {
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// Used in polar area & radar charts since there is only one scale
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base[key] = helpers.configMerge(base.hasOwnProperty(key) ? base[key] : {}, Chart.scaleService.getScaleDefaults(value.type), value);
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} else if (base.hasOwnProperty(key) && helpers.isArray(base[key]) && helpers.isArray(value)) {
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// In this case we have an array of objects replacing another array. Rather than doing a strict replace,
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// merge. This allows easy scale option merging
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var baseArray = base[key];
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helpers.each(value, function(valueObj, index) {
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if (index < baseArray.length) {
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if (typeof baseArray[index] === 'object' && baseArray[index] !== null && typeof valueObj === 'object' && valueObj !== null) {
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// Two objects are coming together. Do a merge of them.
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baseArray[index] = helpers.configMerge(baseArray[index], valueObj);
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} else {
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// Just overwrite in this case since there is nothing to merge
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baseArray[index] = valueObj;
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}
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} else {
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baseArray.push(valueObj); // nothing to merge
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}
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});
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} else if (base.hasOwnProperty(key) && typeof base[key] === "object" && base[key] !== null && typeof value === "object") {
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// If we are overwriting an object with an object, do a merge of the properties.
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base[key] = helpers.configMerge(base[key], value);
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} else {
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// can just overwrite the value in this case
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base[key] = value;
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}
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}
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});
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});
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return base;
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};
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helpers.extendDeep = function(_base) {
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return _extendDeep.apply(this, arguments);
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function _extendDeep(dst) {
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helpers.each(arguments, function(obj) {
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if (obj !== dst) {
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helpers.each(obj, function(value, key) {
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if (dst[key] && dst[key].constructor && dst[key].constructor === Object) {
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_extendDeep(dst[key], value);
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} else {
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dst[key] = value;
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}
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});
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}
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});
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return dst;
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}
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};
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helpers.scaleMerge = function(_base, extension) {
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var base = helpers.clone(_base);
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helpers.each(extension, function(value, key) {
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if (extension.hasOwnProperty(key)) {
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if (key === 'xAxes' || key === 'yAxes') {
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// These properties are arrays of items
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if (base.hasOwnProperty(key)) {
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helpers.each(value, function(valueObj, index) {
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if (index >= base[key].length || !base[key][index].type) {
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base[key].push(helpers.configMerge(valueObj.type ? Chart.scaleService.getScaleDefaults(valueObj.type) : {}, valueObj));
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} else if (valueObj.type !== base[key][index].type) {
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// Type changed. Bring in the new defaults before we bring in valueObj so that valueObj can override the correct scale defaults
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base[key][index] = helpers.configMerge(base[key][index], valueObj.type ? Chart.scaleService.getScaleDefaults(valueObj.type) : {}, valueObj);
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} else {
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// Type is the same
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base[key][index] = helpers.configMerge(base[key][index], valueObj);
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}
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});
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} else {
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base[key] = [];
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helpers.each(value, function(valueObj) {
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base[key].push(helpers.configMerge(valueObj.type ? Chart.scaleService.getScaleDefaults(valueObj.type) : {}, valueObj));
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});
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}
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} else if (base.hasOwnProperty(key) && typeof base[key] === "object" && base[key] !== null && typeof value === "object") {
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// If we are overwriting an object with an object, do a merge of the properties.
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base[key] = helpers.configMerge(base[key], value);
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} else {
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// can just overwrite the value in this case
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base[key] = value;
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}
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}
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});
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return base;
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};
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helpers.getValueAtIndexOrDefault = function(value, index, defaultValue) {
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if (value === undefined || value === null) {
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return defaultValue;
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}
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if (helpers.isArray(value)) {
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return index < value.length ? value[index] : defaultValue;
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}
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return value;
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};
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helpers.getValueOrDefault = function(value, defaultValue) {
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return value === undefined ? defaultValue : value;
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};
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helpers.indexOf = function(arrayToSearch, item) {
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if (Array.prototype.indexOf) {
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return arrayToSearch.indexOf(item);
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} else {
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for (var i = 0; i < arrayToSearch.length; i++) {
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if (arrayToSearch[i] === item)
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return i;
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}
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return -1;
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}
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};
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helpers.where = function(collection, filterCallback) {
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var filtered = [];
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helpers.each(collection, function(item) {
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if (filterCallback(item)) {
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filtered.push(item);
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}
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});
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return filtered;
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};
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helpers.findNextWhere = function(arrayToSearch, filterCallback, startIndex) {
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// Default to start of the array
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if (startIndex === undefined || startIndex === null) {
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startIndex = -1;
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}
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for (var i = startIndex + 1; i < arrayToSearch.length; i++) {
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var currentItem = arrayToSearch[i];
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if (filterCallback(currentItem)) {
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return currentItem;
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}
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}
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};
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helpers.findPreviousWhere = function(arrayToSearch, filterCallback, startIndex) {
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// Default to end of the array
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if (startIndex === undefined || startIndex === null) {
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startIndex = arrayToSearch.length;
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}
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for (var i = startIndex - 1; i >= 0; i--) {
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var currentItem = arrayToSearch[i];
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if (filterCallback(currentItem)) {
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return currentItem;
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}
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}
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};
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helpers.inherits = function(extensions) {
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//Basic javascript inheritance based on the model created in Backbone.js
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var parent = this;
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var ChartElement = (extensions && extensions.hasOwnProperty("constructor")) ? extensions.constructor : function() {
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return parent.apply(this, arguments);
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};
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var Surrogate = function() {
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this.constructor = ChartElement;
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};
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Surrogate.prototype = parent.prototype;
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ChartElement.prototype = new Surrogate();
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ChartElement.extend = helpers.inherits;
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if (extensions) {
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helpers.extend(ChartElement.prototype, extensions);
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}
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ChartElement.__super__ = parent.prototype;
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return ChartElement;
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};
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helpers.noop = function() {};
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helpers.uid = (function() {
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var id = 0;
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return function() {
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return "chart-" + id++;
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};
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})();
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helpers.warn = function(str) {
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//Method for warning of errors
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if (console && typeof console.warn === "function") {
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console.warn(str);
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}
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};
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//-- Math methods
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helpers.isNumber = function(n) {
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return !isNaN(parseFloat(n)) && isFinite(n);
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};
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helpers.almostEquals = function(x, y, epsilon) {
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return Math.abs(x - y) < epsilon;
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};
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helpers.max = function(array) {
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return array.reduce(function(max, value) {
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if (!isNaN(value)) {
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return Math.max(max, value);
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} else {
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return max;
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}
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}, Number.NEGATIVE_INFINITY);
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};
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helpers.min = function(array) {
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return array.reduce(function(min, value) {
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if (!isNaN(value)) {
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return Math.min(min, value);
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} else {
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return min;
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}
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}, Number.POSITIVE_INFINITY);
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};
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helpers.sign = function(x) {
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if (Math.sign) {
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return Math.sign(x);
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} else {
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x = +x; // convert to a number
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if (x === 0 || isNaN(x)) {
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return x;
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}
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return x > 0 ? 1 : -1;
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}
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};
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helpers.log10 = function(x) {
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if (Math.log10) {
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return Math.log10(x);
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} else {
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return Math.log(x) / Math.LN10;
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}
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};
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helpers.toRadians = function(degrees) {
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return degrees * (Math.PI / 180);
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};
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helpers.toDegrees = function(radians) {
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return radians * (180 / Math.PI);
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};
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// Gets the angle from vertical upright to the point about a centre.
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helpers.getAngleFromPoint = function(centrePoint, anglePoint) {
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var distanceFromXCenter = anglePoint.x - centrePoint.x,
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distanceFromYCenter = anglePoint.y - centrePoint.y,
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radialDistanceFromCenter = Math.sqrt(distanceFromXCenter * distanceFromXCenter + distanceFromYCenter * distanceFromYCenter);
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var angle = Math.atan2(distanceFromYCenter, distanceFromXCenter);
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if (angle < (-0.5 * Math.PI)) {
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angle += 2.0 * Math.PI; // make sure the returned angle is in the range of (-PI/2, 3PI/2]
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}
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return {
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angle: angle,
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distance: radialDistanceFromCenter
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};
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};
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helpers.aliasPixel = function(pixelWidth) {
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return (pixelWidth % 2 === 0) ? 0 : 0.5;
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};
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helpers.splineCurve = function(firstPoint, middlePoint, afterPoint, t) {
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//Props to Rob Spencer at scaled innovation for his post on splining between points
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//http://scaledinnovation.com/analytics/splines/aboutSplines.html
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// This function must also respect "skipped" points
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var previous = firstPoint.skip ? middlePoint : firstPoint,
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current = middlePoint,
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next = afterPoint.skip ? middlePoint : afterPoint;
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var d01 = Math.sqrt(Math.pow(current.x - previous.x, 2) + Math.pow(current.y - previous.y, 2));
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var d12 = Math.sqrt(Math.pow(next.x - current.x, 2) + Math.pow(next.y - current.y, 2));
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var s01 = d01 / (d01 + d12);
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var s12 = d12 / (d01 + d12);
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// If all points are the same, s01 & s02 will be inf
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s01 = isNaN(s01) ? 0 : s01;
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s12 = isNaN(s12) ? 0 : s12;
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var fa = t * s01; // scaling factor for triangle Ta
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var fb = t * s12;
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return {
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previous: {
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x: current.x - fa * (next.x - previous.x),
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y: current.y - fa * (next.y - previous.y)
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},
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next: {
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x: current.x + fb * (next.x - previous.x),
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y: current.y + fb * (next.y - previous.y)
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}
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};
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};
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helpers.nextItem = function(collection, index, loop) {
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if (loop) {
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return index >= collection.length - 1 ? collection[0] : collection[index + 1];
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}
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return index >= collection.length - 1 ? collection[collection.length - 1] : collection[index + 1];
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};
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helpers.previousItem = function(collection, index, loop) {
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if (loop) {
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return index <= 0 ? collection[collection.length - 1] : collection[index - 1];
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}
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return index <= 0 ? collection[0] : collection[index - 1];
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};
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// Implementation of the nice number algorithm used in determining where axis labels will go
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helpers.niceNum = function(range, round) {
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var exponent = Math.floor(helpers.log10(range));
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var fraction = range / Math.pow(10, exponent);
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var niceFraction;
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if (round) {
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if (fraction < 1.5) {
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niceFraction = 1;
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} else if (fraction < 3) {
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niceFraction = 2;
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} else if (fraction < 7) {
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niceFraction = 5;
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} else {
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niceFraction = 10;
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}
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} else {
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if (fraction <= 1.0) {
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niceFraction = 1;
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} else if (fraction <= 2) {
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niceFraction = 2;
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} else if (fraction <= 5) {
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niceFraction = 5;
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} else {
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niceFraction = 10;
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}
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}
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return niceFraction * Math.pow(10, exponent);
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};
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//Easing functions adapted from Robert Penner's easing equations
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//http://www.robertpenner.com/easing/
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var easingEffects = helpers.easingEffects = {
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linear: function(t) {
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return t;
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},
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easeInQuad: function(t) {
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return t * t;
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},
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easeOutQuad: function(t) {
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return -1 * t * (t - 2);
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},
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easeInOutQuad: function(t) {
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if ((t /= 1 / 2) < 1) {
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return 1 / 2 * t * t;
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}
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return -1 / 2 * ((--t) * (t - 2) - 1);
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},
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easeInCubic: function(t) {
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return t * t * t;
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},
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easeOutCubic: function(t) {
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return 1 * ((t = t / 1 - 1) * t * t + 1);
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},
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easeInOutCubic: function(t) {
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if ((t /= 1 / 2) < 1) {
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return 1 / 2 * t * t * t;
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}
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return 1 / 2 * ((t -= 2) * t * t + 2);
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},
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easeInQuart: function(t) {
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return t * t * t * t;
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},
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easeOutQuart: function(t) {
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return -1 * ((t = t / 1 - 1) * t * t * t - 1);
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},
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easeInOutQuart: function(t) {
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if ((t /= 1 / 2) < 1) {
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return 1 / 2 * t * t * t * t;
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}
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return -1 / 2 * ((t -= 2) * t * t * t - 2);
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},
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easeInQuint: function(t) {
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return 1 * (t /= 1) * t * t * t * t;
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},
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easeOutQuint: function(t) {
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return 1 * ((t = t / 1 - 1) * t * t * t * t + 1);
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},
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easeInOutQuint: function(t) {
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if ((t /= 1 / 2) < 1) {
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return 1 / 2 * t * t * t * t * t;
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}
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return 1 / 2 * ((t -= 2) * t * t * t * t + 2);
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},
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easeInSine: function(t) {
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return -1 * Math.cos(t / 1 * (Math.PI / 2)) + 1;
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},
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easeOutSine: function(t) {
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return 1 * Math.sin(t / 1 * (Math.PI / 2));
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},
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easeInOutSine: function(t) {
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return -1 / 2 * (Math.cos(Math.PI * t / 1) - 1);
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},
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easeInExpo: function(t) {
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return (t === 0) ? 1 : 1 * Math.pow(2, 10 * (t / 1 - 1));
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},
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easeOutExpo: function(t) {
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return (t === 1) ? 1 : 1 * (-Math.pow(2, -10 * t / 1) + 1);
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},
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easeInOutExpo: function(t) {
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if (t === 0) {
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return 0;
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}
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if (t === 1) {
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return 1;
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}
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if ((t /= 1 / 2) < 1) {
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return 1 / 2 * Math.pow(2, 10 * (t - 1));
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}
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return 1 / 2 * (-Math.pow(2, -10 * --t) + 2);
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},
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easeInCirc: function(t) {
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if (t >= 1) {
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return t;
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}
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return -1 * (Math.sqrt(1 - (t /= 1) * t) - 1);
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},
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easeOutCirc: function(t) {
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return 1 * Math.sqrt(1 - (t = t / 1 - 1) * t);
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},
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easeInOutCirc: function(t) {
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if ((t /= 1 / 2) < 1) {
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return -1 / 2 * (Math.sqrt(1 - t * t) - 1);
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|
}
|
|
return 1 / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1);
|
|
},
|
|
easeInElastic: function(t) {
|
|
var s = 1.70158;
|
|
var p = 0;
|
|
var a = 1;
|
|
if (t === 0) {
|
|
return 0;
|
|
}
|
|
if ((t /= 1) === 1) {
|
|
return 1;
|
|
}
|
|
if (!p) {
|
|
p = 1 * 0.3;
|
|
}
|
|
if (a < Math.abs(1)) {
|
|
a = 1;
|
|
s = p / 4;
|
|
} else {
|
|
s = p / (2 * Math.PI) * Math.asin(1 / a);
|
|
}
|
|
return -(a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * 1 - s) * (2 * Math.PI) / p));
|
|
},
|
|
easeOutElastic: function(t) {
|
|
var s = 1.70158;
|
|
var p = 0;
|
|
var a = 1;
|
|
if (t === 0) {
|
|
return 0;
|
|
}
|
|
if ((t /= 1) === 1) {
|
|
return 1;
|
|
}
|
|
if (!p) {
|
|
p = 1 * 0.3;
|
|
}
|
|
if (a < Math.abs(1)) {
|
|
a = 1;
|
|
s = p / 4;
|
|
} else {
|
|
s = p / (2 * Math.PI) * Math.asin(1 / a);
|
|
}
|
|
return a * Math.pow(2, -10 * t) * Math.sin((t * 1 - s) * (2 * Math.PI) / p) + 1;
|
|
},
|
|
easeInOutElastic: function(t) {
|
|
var s = 1.70158;
|
|
var p = 0;
|
|
var a = 1;
|
|
if (t === 0) {
|
|
return 0;
|
|
}
|
|
if ((t /= 1 / 2) === 2) {
|
|
return 1;
|
|
}
|
|
if (!p) {
|
|
p = 1 * (0.3 * 1.5);
|
|
}
|
|
if (a < Math.abs(1)) {
|
|
a = 1;
|
|
s = p / 4;
|
|
} else {
|
|
s = p / (2 * Math.PI) * Math.asin(1 / a);
|
|
}
|
|
if (t < 1) {
|
|
return -0.5 * (a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * 1 - s) * (2 * Math.PI) / p));
|
|
}
|
|
return a * Math.pow(2, -10 * (t -= 1)) * Math.sin((t * 1 - s) * (2 * Math.PI) / p) * 0.5 + 1;
|
|
},
|
|
easeInBack: function(t) {
|
|
var s = 1.70158;
|
|
return 1 * (t /= 1) * t * ((s + 1) * t - s);
|
|
},
|
|
easeOutBack: function(t) {
|
|
var s = 1.70158;
|
|
return 1 * ((t = t / 1 - 1) * t * ((s + 1) * t + s) + 1);
|
|
},
|
|
easeInOutBack: function(t) {
|
|
var s = 1.70158;
|
|
if ((t /= 1 / 2) < 1) {
|
|
return 1 / 2 * (t * t * (((s *= (1.525)) + 1) * t - s));
|
|
}
|
|
return 1 / 2 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2);
|
|
},
|
|
easeInBounce: function(t) {
|
|
return 1 - easingEffects.easeOutBounce(1 - t);
|
|
},
|
|
easeOutBounce: function(t) {
|
|
if ((t /= 1) < (1 / 2.75)) {
|
|
return 1 * (7.5625 * t * t);
|
|
} else if (t < (2 / 2.75)) {
|
|
return 1 * (7.5625 * (t -= (1.5 / 2.75)) * t + 0.75);
|
|
} else if (t < (2.5 / 2.75)) {
|
|
return 1 * (7.5625 * (t -= (2.25 / 2.75)) * t + 0.9375);
|
|
} else {
|
|
return 1 * (7.5625 * (t -= (2.625 / 2.75)) * t + 0.984375);
|
|
}
|
|
},
|
|
easeInOutBounce: function(t) {
|
|
if (t < 1 / 2) {
|
|
return easingEffects.easeInBounce(t * 2) * 0.5;
|
|
}
|
|
return easingEffects.easeOutBounce(t * 2 - 1) * 0.5 + 1 * 0.5;
|
|
}
|
|
};
|
|
//Request animation polyfill - http://www.paulirish.com/2011/requestanimationframe-for-smart-animating/
|
|
helpers.requestAnimFrame = (function() {
|
|
return window.requestAnimationFrame ||
|
|
window.webkitRequestAnimationFrame ||
|
|
window.mozRequestAnimationFrame ||
|
|
window.oRequestAnimationFrame ||
|
|
window.msRequestAnimationFrame ||
|
|
function(callback) {
|
|
return window.setTimeout(callback, 1000 / 60);
|
|
};
|
|
})();
|
|
helpers.cancelAnimFrame = (function() {
|
|
return window.cancelAnimationFrame ||
|
|
window.webkitCancelAnimationFrame ||
|
|
window.mozCancelAnimationFrame ||
|
|
window.oCancelAnimationFrame ||
|
|
window.msCancelAnimationFrame ||
|
|
function(callback) {
|
|
return window.clearTimeout(callback, 1000 / 60);
|
|
};
|
|
})();
|
|
//-- DOM methods
|
|
helpers.getRelativePosition = function(evt, chart) {
|
|
var mouseX, mouseY;
|
|
var e = evt.originalEvent || evt,
|
|
canvas = evt.currentTarget || evt.srcElement,
|
|
boundingRect = canvas.getBoundingClientRect();
|
|
|
|
if (e.touches && e.touches.length > 0) {
|
|
mouseX = e.touches[0].clientX;
|
|
mouseY = e.touches[0].clientY;
|
|
|
|
} else {
|
|
mouseX = e.clientX;
|
|
mouseY = e.clientY;
|
|
}
|
|
|
|
// Scale mouse coordinates into canvas coordinates
|
|
// by following the pattern laid out by 'jerryj' in the comments of
|
|
// http://www.html5canvastutorials.com/advanced/html5-canvas-mouse-coordinates/
|
|
|
|
// We divide by the current device pixel ratio, because the canvas is scaled up by that amount in each direction. However
|
|
// the backend model is in unscaled coordinates. Since we are going to deal with our model coordinates, we go back here
|
|
mouseX = Math.round((mouseX - boundingRect.left) / (boundingRect.right - boundingRect.left) * canvas.width / chart.currentDevicePixelRatio);
|
|
mouseY = Math.round((mouseY - boundingRect.top) / (boundingRect.bottom - boundingRect.top) * canvas.height / chart.currentDevicePixelRatio);
|
|
|
|
return {
|
|
x: mouseX,
|
|
y: mouseY
|
|
};
|
|
|
|
};
|
|
helpers.addEvent = function(node, eventType, method) {
|
|
if (node.addEventListener) {
|
|
node.addEventListener(eventType, method);
|
|
} else if (node.attachEvent) {
|
|
node.attachEvent("on" + eventType, method);
|
|
} else {
|
|
node["on" + eventType] = method;
|
|
}
|
|
};
|
|
helpers.removeEvent = function(node, eventType, handler) {
|
|
if (node.removeEventListener) {
|
|
node.removeEventListener(eventType, handler, false);
|
|
} else if (node.detachEvent) {
|
|
node.detachEvent("on" + eventType, handler);
|
|
} else {
|
|
node["on" + eventType] = helpers.noop;
|
|
}
|
|
};
|
|
helpers.bindEvents = function(chartInstance, arrayOfEvents, handler) {
|
|
// Create the events object if it's not already present
|
|
if (!chartInstance.events)
|
|
chartInstance.events = {};
|
|
|
|
helpers.each(arrayOfEvents, function(eventName) {
|
|
chartInstance.events[eventName] = function() {
|
|
handler.apply(chartInstance, arguments);
|
|
};
|
|
helpers.addEvent(chartInstance.chart.canvas, eventName, chartInstance.events[eventName]);
|
|
});
|
|
};
|
|
helpers.unbindEvents = function(chartInstance, arrayOfEvents) {
|
|
helpers.each(arrayOfEvents, function(handler, eventName) {
|
|
helpers.removeEvent(chartInstance.chart.canvas, eventName, handler);
|
|
});
|
|
};
|
|
helpers.getConstraintWidth = function(domNode) { // returns Number or undefined if no constraint
|
|
var constrainedWidth;
|
|
var constrainedWNode = document.defaultView.getComputedStyle(domNode)['max-width'];
|
|
var constrainedWContainer = document.defaultView.getComputedStyle(domNode.parentNode)['max-width'];
|
|
var hasCWNode = constrainedWNode !== null && constrainedWNode !== "none";
|
|
var hasCWContainer = constrainedWContainer !== null && constrainedWContainer !== "none";
|
|
|
|
if (hasCWNode || hasCWContainer) {
|
|
constrainedWidth = Math.min((hasCWNode ? parseInt(constrainedWNode, 10) : Number.POSITIVE_INFINITY), (hasCWContainer ? parseInt(constrainedWContainer, 10) : Number.POSITIVE_INFINITY));
|
|
}
|
|
return constrainedWidth;
|
|
};
|
|
// returns Number or undefined if no constraint
|
|
helpers.getConstraintHeight = function(domNode) {
|
|
var constrainedHeight;
|
|
var constrainedHNode = document.defaultView.getComputedStyle(domNode)['max-height'];
|
|
var constrainedHContainer = document.defaultView.getComputedStyle(domNode.parentNode)['max-height'];
|
|
var hasCHNode = constrainedHNode !== null && constrainedHNode !== "none";
|
|
var hasCHContainer = constrainedHContainer !== null && constrainedHContainer !== "none";
|
|
|
|
if (constrainedHNode || constrainedHContainer) {
|
|
constrainedHeight = Math.min((hasCHNode ? parseInt(constrainedHNode, 10) : Number.POSITIVE_INFINITY), (hasCHContainer ? parseInt(constrainedHContainer, 10) : Number.POSITIVE_INFINITY));
|
|
}
|
|
return constrainedHeight;
|
|
};
|
|
helpers.getMaximumWidth = function(domNode) {
|
|
var container = domNode.parentNode;
|
|
var padding = parseInt(helpers.getStyle(container, 'padding-left')) + parseInt(helpers.getStyle(container, 'padding-right'));
|
|
|
|
var w = container.clientWidth - padding;
|
|
var cw = helpers.getConstraintWidth(domNode);
|
|
if (cw !== undefined) {
|
|
w = Math.min(w, cw);
|
|
}
|
|
|
|
return w;
|
|
};
|
|
helpers.getMaximumHeight = function(domNode) {
|
|
var container = domNode.parentNode;
|
|
var padding = parseInt(helpers.getStyle(container, 'padding-top')) + parseInt(helpers.getStyle(container, 'padding-bottom'));
|
|
|
|
var h = container.clientHeight - padding;
|
|
var ch = helpers.getConstraintHeight(domNode);
|
|
if (ch !== undefined) {
|
|
h = Math.min(h, ch);
|
|
}
|
|
|
|
return h;
|
|
};
|
|
helpers.getStyle = function(el, property) {
|
|
return el.currentStyle ?
|
|
el.currentStyle[property] :
|
|
document.defaultView.getComputedStyle(el, null).getPropertyValue(property);
|
|
};
|
|
helpers.retinaScale = function(chart) {
|
|
var ctx = chart.ctx;
|
|
var width = chart.canvas.width;
|
|
var height = chart.canvas.height;
|
|
var pixelRatio = chart.currentDevicePixelRatio = window.devicePixelRatio || 1;
|
|
|
|
if (pixelRatio !== 1) {
|
|
ctx.canvas.height = height * pixelRatio;
|
|
ctx.canvas.width = width * pixelRatio;
|
|
ctx.scale(pixelRatio, pixelRatio);
|
|
|
|
ctx.canvas.style.width = width + 'px';
|
|
ctx.canvas.style.height = height + 'px';
|
|
|
|
// Store the device pixel ratio so that we can go backwards in `destroy`.
|
|
// The devicePixelRatio changes with zoom, so there are no guarantees that it is the same
|
|
// when destroy is called
|
|
chart.originalDevicePixelRatio = chart.originalDevicePixelRatio || pixelRatio;
|
|
}
|
|
};
|
|
//-- Canvas methods
|
|
helpers.clear = function(chart) {
|
|
chart.ctx.clearRect(0, 0, chart.width, chart.height);
|
|
};
|
|
helpers.fontString = function(pixelSize, fontStyle, fontFamily) {
|
|
return fontStyle + " " + pixelSize + "px " + fontFamily;
|
|
};
|
|
helpers.longestText = function(ctx, font, arrayOfStrings, cache) {
|
|
cache = cache || {};
|
|
cache.data = cache.data || {};
|
|
cache.garbageCollect = cache.garbageCollect || [];
|
|
|
|
if (cache.font !== font) {
|
|
cache.data = {};
|
|
cache.garbageCollect = [];
|
|
cache.font = font;
|
|
}
|
|
|
|
ctx.font = font;
|
|
var longest = 0;
|
|
helpers.each(arrayOfStrings, function(string) {
|
|
var textWidth = cache.data[string];
|
|
if (!textWidth) {
|
|
textWidth = cache.data[string] = ctx.measureText(string).width;
|
|
cache.garbageCollect.push(string);
|
|
}
|
|
if (textWidth > longest)
|
|
longest = textWidth;
|
|
});
|
|
|
|
var gcLen = cache.garbageCollect.length / 2;
|
|
if (gcLen > arrayOfStrings.length) {
|
|
for (var i = 0; i < gcLen; i++) {
|
|
var key = cache.garbageCollect.shift();
|
|
delete cache.data[key];
|
|
}
|
|
}
|
|
|
|
return longest;
|
|
};
|
|
helpers.drawRoundedRectangle = function(ctx, x, y, width, height, radius) {
|
|
ctx.beginPath();
|
|
ctx.moveTo(x + radius, y);
|
|
ctx.lineTo(x + width - radius, y);
|
|
ctx.quadraticCurveTo(x + width, y, x + width, y + radius);
|
|
ctx.lineTo(x + width, y + height - radius);
|
|
ctx.quadraticCurveTo(x + width, y + height, x + width - radius, y + height);
|
|
ctx.lineTo(x + radius, y + height);
|
|
ctx.quadraticCurveTo(x, y + height, x, y + height - radius);
|
|
ctx.lineTo(x, y + radius);
|
|
ctx.quadraticCurveTo(x, y, x + radius, y);
|
|
ctx.closePath();
|
|
};
|
|
helpers.color = function(c) {
|
|
if (!color) {
|
|
console.log('Color.js not found!');
|
|
return c;
|
|
}
|
|
return color(c);
|
|
};
|
|
helpers.addResizeListener = function(node, callback) {
|
|
// Hide an iframe before the node
|
|
var hiddenIframe = document.createElement('iframe');
|
|
var hiddenIframeClass = 'chartjs-hidden-iframe';
|
|
|
|
if (hiddenIframe.classlist) {
|
|
// can use classlist
|
|
hiddenIframe.classlist.add(hiddenIframeClass);
|
|
} else {
|
|
hiddenIframe.setAttribute('class', hiddenIframeClass);
|
|
}
|
|
|
|
// Set the style
|
|
hiddenIframe.style.width = '100%';
|
|
hiddenIframe.style.display = 'block';
|
|
hiddenIframe.style.border = 0;
|
|
hiddenIframe.style.height = 0;
|
|
hiddenIframe.style.margin = 0;
|
|
hiddenIframe.style.position = 'absolute';
|
|
hiddenIframe.style.left = 0;
|
|
hiddenIframe.style.right = 0;
|
|
hiddenIframe.style.top = 0;
|
|
hiddenIframe.style.bottom = 0;
|
|
|
|
// Insert the iframe so that contentWindow is available
|
|
node.insertBefore(hiddenIframe, node.firstChild);
|
|
|
|
(hiddenIframe.contentWindow || hiddenIframe).onresize = function() {
|
|
if (callback) {
|
|
callback();
|
|
}
|
|
};
|
|
};
|
|
helpers.removeResizeListener = function(node) {
|
|
var hiddenIframe = node.querySelector('.chartjs-hidden-iframe');
|
|
|
|
// Remove the resize detect iframe
|
|
if (hiddenIframe) {
|
|
hiddenIframe.parentNode.removeChild(hiddenIframe);
|
|
}
|
|
};
|
|
helpers.isArray = function(obj) {
|
|
if (!Array.isArray) {
|
|
return Object.prototype.toString.call(obj) === '[object Array]';
|
|
}
|
|
return Array.isArray(obj);
|
|
};
|
|
helpers.pushAllIfDefined = function(element, array) {
|
|
if (typeof element === "undefined") {
|
|
return;
|
|
}
|
|
|
|
if (helpers.isArray(element)) {
|
|
array.push.apply(array, element);
|
|
} else {
|
|
array.push(element);
|
|
}
|
|
};
|
|
helpers.isDatasetVisible = function(dataset) {
|
|
return !dataset.hidden;
|
|
};
|
|
helpers.callCallback = function(fn, args, _tArg) {
|
|
if (fn && typeof fn.call === 'function') {
|
|
fn.apply(_tArg, args);
|
|
}
|
|
};
|
|
|
|
}; |