361 lines
13 KiB
JavaScript
361 lines
13 KiB
JavaScript
/* global jQuery */
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(function($) {
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'use strict';
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var options = {
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zoom: {
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enableTouch: false
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},
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pan: {
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enableTouch: false,
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touchMode: 'manual'
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},
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recenter: {
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enableTouch: true
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}
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};
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var ZOOM_DISTANCE_MARGIN = $.plot.uiConstants.ZOOM_DISTANCE_MARGIN;
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function init(plot) {
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plot.hooks.processOptions.push(initTouchNavigation);
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}
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function initTouchNavigation(plot, options) {
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var gestureState = {
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zoomEnable: false,
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prevDistance: null,
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prevTapTime: 0,
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prevPanPosition: { x: 0, y: 0 },
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prevTapPosition: { x: 0, y: 0 }
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},
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navigationState = {
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prevTouchedAxis: 'none',
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currentTouchedAxis: 'none',
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touchedAxis: null,
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navigationConstraint: 'unconstrained',
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initialState: null
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},
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useManualPan = options.pan.interactive && options.pan.touchMode === 'manual',
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smartPanLock = options.pan.touchMode === 'smartLock',
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useSmartPan = options.pan.interactive && (smartPanLock || options.pan.touchMode === 'smart'),
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pan, pinch, doubleTap;
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function bindEvents(plot, eventHolder) {
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var o = plot.getOptions();
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if (o.zoom.interactive && o.zoom.enableTouch) {
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eventHolder[0].addEventListener('pinchstart', pinch.start, false);
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eventHolder[0].addEventListener('pinchdrag', pinch.drag, false);
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eventHolder[0].addEventListener('pinchend', pinch.end, false);
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}
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if (o.pan.interactive && o.pan.enableTouch) {
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eventHolder[0].addEventListener('panstart', pan.start, false);
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eventHolder[0].addEventListener('pandrag', pan.drag, false);
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eventHolder[0].addEventListener('panend', pan.end, false);
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}
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if ((o.recenter.interactive && o.recenter.enableTouch)) {
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eventHolder[0].addEventListener('doubletap', doubleTap.recenterPlot, false);
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}
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}
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function shutdown(plot, eventHolder) {
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eventHolder[0].removeEventListener('panstart', pan.start);
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eventHolder[0].removeEventListener('pandrag', pan.drag);
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eventHolder[0].removeEventListener('panend', pan.end);
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eventHolder[0].removeEventListener('pinchstart', pinch.start);
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eventHolder[0].removeEventListener('pinchdrag', pinch.drag);
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eventHolder[0].removeEventListener('pinchend', pinch.end);
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eventHolder[0].removeEventListener('doubletap', doubleTap.recenterPlot);
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}
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pan = {
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start: function(e) {
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presetNavigationState(e, 'pan', gestureState);
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updateData(e, 'pan', gestureState, navigationState);
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if (useSmartPan) {
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var point = getPoint(e, 'pan');
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navigationState.initialState = plot.navigationState(point.x, point.y);
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}
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},
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drag: function(e) {
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presetNavigationState(e, 'pan', gestureState);
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if (useSmartPan) {
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var point = getPoint(e, 'pan');
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plot.smartPan({
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x: navigationState.initialState.startPageX - point.x,
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y: navigationState.initialState.startPageY - point.y
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}, navigationState.initialState, navigationState.touchedAxis, false, smartPanLock);
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} else if (useManualPan) {
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plot.pan({
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left: -delta(e, 'pan', gestureState).x,
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top: -delta(e, 'pan', gestureState).y,
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axes: navigationState.touchedAxis
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});
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updatePrevPanPosition(e, 'pan', gestureState, navigationState);
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}
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},
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end: function(e) {
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presetNavigationState(e, 'pan', gestureState);
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if (useSmartPan) {
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plot.smartPan.end();
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}
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if (wasPinchEvent(e, gestureState)) {
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updateprevPanPosition(e, 'pan', gestureState, navigationState);
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}
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}
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};
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var pinchDragTimeout;
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pinch = {
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start: function(e) {
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if (pinchDragTimeout) {
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clearTimeout(pinchDragTimeout);
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pinchDragTimeout = null;
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}
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presetNavigationState(e, 'pinch', gestureState);
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setPrevDistance(e, gestureState);
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updateData(e, 'pinch', gestureState, navigationState);
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},
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drag: function(e) {
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if (pinchDragTimeout) {
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return;
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}
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pinchDragTimeout = setTimeout(function() {
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presetNavigationState(e, 'pinch', gestureState);
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plot.pan({
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left: -delta(e, 'pinch', gestureState).x,
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top: -delta(e, 'pinch', gestureState).y,
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axes: navigationState.touchedAxis
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});
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updatePrevPanPosition(e, 'pinch', gestureState, navigationState);
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var dist = pinchDistance(e);
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if (gestureState.zoomEnable || Math.abs(dist - gestureState.prevDistance) > ZOOM_DISTANCE_MARGIN) {
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zoomPlot(plot, e, gestureState, navigationState);
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//activate zoom mode
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gestureState.zoomEnable = true;
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}
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pinchDragTimeout = null;
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}, 1000 / 60);
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},
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end: function(e) {
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if (pinchDragTimeout) {
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clearTimeout(pinchDragTimeout);
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pinchDragTimeout = null;
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}
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presetNavigationState(e, 'pinch', gestureState);
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gestureState.prevDistance = null;
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}
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};
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doubleTap = {
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recenterPlot: function(e) {
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if (e && e.detail && e.detail.type === 'touchstart') {
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// only do not recenter for touch start;
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recenterPlotOnDoubleTap(plot, e, gestureState, navigationState);
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}
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}
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};
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if (options.pan.enableTouch === true || options.zoom.enableTouch === true) {
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plot.hooks.bindEvents.push(bindEvents);
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plot.hooks.shutdown.push(shutdown);
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}
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function presetNavigationState(e, gesture, gestureState) {
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navigationState.touchedAxis = getAxis(plot, e, gesture, navigationState);
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if (noAxisTouched(navigationState)) {
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navigationState.navigationConstraint = 'unconstrained';
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} else {
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navigationState.navigationConstraint = 'axisConstrained';
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}
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}
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}
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$.plot.plugins.push({
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init: init,
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options: options,
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name: 'navigateTouch',
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version: '0.3'
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});
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function recenterPlotOnDoubleTap(plot, e, gestureState, navigationState) {
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checkAxesForDoubleTap(plot, e, navigationState);
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if ((navigationState.currentTouchedAxis === 'x' && navigationState.prevTouchedAxis === 'x') ||
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(navigationState.currentTouchedAxis === 'y' && navigationState.prevTouchedAxis === 'y') ||
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(navigationState.currentTouchedAxis === 'none' && navigationState.prevTouchedAxis === 'none')) {
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var event;
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plot.recenter({ axes: navigationState.touchedAxis });
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if (navigationState.touchedAxis) {
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event = new $.Event('re-center', { detail: { axisTouched: navigationState.touchedAxis } });
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} else {
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event = new $.Event('re-center', { detail: e });
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}
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plot.getPlaceholder().trigger(event);
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}
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}
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function checkAxesForDoubleTap(plot, e, navigationState) {
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var axis = plot.getTouchedAxis(e.detail.firstTouch.x, e.detail.firstTouch.y);
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if (axis[0] !== undefined) {
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navigationState.prevTouchedAxis = axis[0].direction;
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}
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axis = plot.getTouchedAxis(e.detail.secondTouch.x, e.detail.secondTouch.y);
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if (axis[0] !== undefined) {
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navigationState.touchedAxis = axis;
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navigationState.currentTouchedAxis = axis[0].direction;
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}
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if (noAxisTouched(navigationState)) {
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navigationState.touchedAxis = null;
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navigationState.prevTouchedAxis = 'none';
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navigationState.currentTouchedAxis = 'none';
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}
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}
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function zoomPlot(plot, e, gestureState, navigationState) {
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var offset = plot.offset(),
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center = {
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left: 0,
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top: 0
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},
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zoomAmount = pinchDistance(e) / gestureState.prevDistance,
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dist = pinchDistance(e);
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center.left = getPoint(e, 'pinch').x - offset.left;
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center.top = getPoint(e, 'pinch').y - offset.top;
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// send the computed touched axis to the zoom function so that it only zooms on that one
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plot.zoom({
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center: center,
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amount: zoomAmount,
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axes: navigationState.touchedAxis
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});
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gestureState.prevDistance = dist;
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}
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function wasPinchEvent(e, gestureState) {
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return (gestureState.zoomEnable && e.detail.touches.length === 1);
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}
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function getAxis(plot, e, gesture, navigationState) {
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if (e.type === 'pinchstart') {
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var axisTouch1 = plot.getTouchedAxis(e.detail.touches[0].pageX, e.detail.touches[0].pageY);
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var axisTouch2 = plot.getTouchedAxis(e.detail.touches[1].pageX, e.detail.touches[1].pageY);
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if (axisTouch1.length === axisTouch2.length && axisTouch1.toString() === axisTouch2.toString()) {
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return axisTouch1;
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}
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} else if (e.type === 'panstart') {
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return plot.getTouchedAxis(e.detail.touches[0].pageX, e.detail.touches[0].pageY);
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} else if (e.type === 'pinchend') {
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//update axis since instead on pinch, a pan event is made
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return plot.getTouchedAxis(e.detail.touches[0].pageX, e.detail.touches[0].pageY);
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} else {
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return navigationState.touchedAxis;
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}
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}
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function noAxisTouched(navigationState) {
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return (!navigationState.touchedAxis || navigationState.touchedAxis.length === 0);
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}
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function setPrevDistance(e, gestureState) {
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gestureState.prevDistance = pinchDistance(e);
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}
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function updateData(e, gesture, gestureState, navigationState) {
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var axisDir,
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point = getPoint(e, gesture);
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switch (navigationState.navigationConstraint) {
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case 'unconstrained':
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navigationState.touchedAxis = null;
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gestureState.prevTapPosition = {
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x: gestureState.prevPanPosition.x,
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y: gestureState.prevPanPosition.y
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};
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gestureState.prevPanPosition = {
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x: point.x,
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y: point.y
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};
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break;
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case 'axisConstrained':
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axisDir = navigationState.touchedAxis[0].direction;
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navigationState.currentTouchedAxis = axisDir;
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gestureState.prevTapPosition[axisDir] = gestureState.prevPanPosition[axisDir];
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gestureState.prevPanPosition[axisDir] = point[axisDir];
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break;
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default:
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break;
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}
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}
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function distance(x1, y1, x2, y2) {
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return Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
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}
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function pinchDistance(e) {
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var t1 = e.detail.touches[0],
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t2 = e.detail.touches[1];
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return distance(t1.pageX, t1.pageY, t2.pageX, t2.pageY);
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}
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function updatePrevPanPosition(e, gesture, gestureState, navigationState) {
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var point = getPoint(e, gesture);
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switch (navigationState.navigationConstraint) {
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case 'unconstrained':
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gestureState.prevPanPosition.x = point.x;
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gestureState.prevPanPosition.y = point.y;
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break;
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case 'axisConstrained':
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gestureState.prevPanPosition[navigationState.currentTouchedAxis] =
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point[navigationState.currentTouchedAxis];
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break;
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default:
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break;
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}
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}
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function delta(e, gesture, gestureState) {
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var point = getPoint(e, gesture);
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return {
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x: point.x - gestureState.prevPanPosition.x,
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y: point.y - gestureState.prevPanPosition.y
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}
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}
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function getPoint(e, gesture) {
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if (gesture === 'pinch') {
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return {
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x: (e.detail.touches[0].pageX + e.detail.touches[1].pageX) / 2,
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y: (e.detail.touches[0].pageY + e.detail.touches[1].pageY) / 2
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}
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} else {
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return {
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x: e.detail.touches[0].pageX,
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y: e.detail.touches[0].pageY
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}
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}
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}
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})(jQuery);
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