atlas/web/_js/view.js

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JavaScript
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/*
========================================================================
The /r/place Atlas
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An Atlas of Reddit's /r/place, with information to each
artwork of the canvas provided by the community.
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Copyright (C) 2017 Roland Rytz <roland@draemm.li>
Licensed under the GNU Affero General Public License Version 3
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
For more information, see:
http://place-atlas.stefanocoding.me/license.txt
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========================================================================
*/
var linesCanvas = document.getElementById("linesCanvas");
var linesContext = linesCanvas.getContext("2d");
var hovered = [];
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var previousZoomOrigin = [0, 0];
var previousScaleZoomOrigin = [0, 0];
var backgroundCanvas = document.createElement("canvas");
backgroundCanvas.width = 2000;
backgroundCanvas.height = 2000;
var backgroundContext = backgroundCanvas.getContext("2d");
function updateLines(){
linesCanvas.width = linesCanvas.clientWidth;
linesCanvas.height = linesCanvas.clientHeight;
linesContext.lineCap = "round";
linesContext.lineWidth = Math.max(Math.min(zoom*1.5, 16*1.5), 6);
linesContext.strokeStyle = "#000000";
for(var i = 0; i < hovered.length; i++){
var element = hovered[i].element;
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if(element.getBoundingClientRect().left != 0){
linesContext.beginPath();
//linesContext.moveTo(element.offsetLeft + element.clientWidth - 10, element.offsetTop + 20);
linesContext.moveTo(
element.getBoundingClientRect().left + document.documentElement.scrollLeft + element.clientWidth/2
,element.getBoundingClientRect().top + document.documentElement.scrollTop + 20
);
linesContext.lineTo(
~~(hovered[i].center[0]*zoom) + innerContainer.offsetLeft
,~~(hovered[i].center[1]*zoom) + innerContainer.offsetTop
);
linesContext.stroke();
}
}
linesContext.lineWidth = Math.max(Math.min(zoom, 16), 4);
linesContext.strokeStyle = "#FFFFFF";
for(var i = 0; i < hovered.length; i++){
var element = hovered[i].element;
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if(element.getBoundingClientRect().left != 0){
linesContext.beginPath();
linesContext.moveTo(
element.getBoundingClientRect().left + document.documentElement.scrollLeft + element.clientWidth/2
,element.getBoundingClientRect().top + document.documentElement.scrollTop + 20
);
linesContext.lineTo(
~~(hovered[i].center[0]*zoom) + innerContainer.offsetLeft
,~~(hovered[i].center[1]*zoom) + innerContainer.offsetTop
);
linesContext.stroke();
}
}
}
function renderBackground(atlas){
backgroundContext.clearRect(0, 0, canvas.width, canvas.height);
//backgroundCanvas.width = 1000 * zoom;
//backgroundCanvas.height = 1000 * zoom;
//backgroundContext.lineWidth = zoom;
backgroundContext.fillStyle = "rgba(0, 0, 0, 0.6)";
backgroundContext.fillRect(0, 0, backgroundCanvas.width, backgroundCanvas.height);
for(var i = 0; i < atlas.length; i++){
var path = atlas[i].path;
backgroundContext.beginPath();
if(path[0]){
//backgroundContext.moveTo(path[0][0]*zoom, path[0][1]*zoom);
backgroundContext.moveTo(path[0][0], path[0][1]);
}
for(var p = 1; p < path.length; p++){
//backgroundContext.lineTo(path[p][0]*zoom, path[p][1]*zoom);
backgroundContext.lineTo(path[p][0], path[p][1]);
}
backgroundContext.closePath();
backgroundContext.strokeStyle = "rgba(255, 255, 255, 0.8)";
backgroundContext.stroke();
}
}
function initView(){
var wrapper = document.getElementById("wrapper");
var objectsContainer = document.getElementById("objectsList");
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var closeObjectsListButton = document.getElementById("closeObjectsListButton");
var filterInput = document.getElementById("searchList");
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var entriesList = document.getElementById("entriesList");
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var hideListButton = document.getElementById("hideListButton");
var entriesListShown = true;
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var sortedAtlas;
var entriesLimit = 50;
var entriesOffset = 0;
var moreEntriesButton = document.createElement("button");
moreEntriesButton.innerHTML = "Show "+entriesLimit+" more";
moreEntriesButton.id = "moreEntriesButton";
moreEntriesButton.onclick = function(){
buildObjectsList(null, null);
};
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var defaultSort = "shuffle";
document.getElementById("sort").value = defaultSort;
var lastPos = [0, 0];
var fixed = false; // Fix hovered items in place, so that clicking on links is possible
renderBackground(atlas);
render();
buildObjectsList(null, null);
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// parse linked atlas entry id from link hash
/*if (window.location.hash.substring(3)){
zoom = 4;
applyView();
highlightEntryFromUrl();
}*/
if(document.documentElement.clientWidth > 2000){
entriesListShown = true;
wrapper.className = wrapper.className.replace(/ listHidden/g, "");
}
if(document.documentElement.clientWidth < 2000){
entriesListShown = false;
wrapper.className += " listHidden";
}
applyView();
render();
updateLines();
var args = window.location.search;
if(args){
id = args.split("id=")[1];
if(id){
highlightEntryFromUrl();
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}
}
container.addEventListener("mousemove", function(e){
if(e.sourceCapabilities){
if(!e.sourceCapabilities.firesTouchEvents){
updateHovering(e);
}
} else {
updateHovering(e);
}
});
filterInput.addEventListener("input", function(e){
entriesOffset = 0;
entriesList.innerHTML = "";
entriesList.appendChild(moreEntriesButton);
if(this.value === ""){
document.getElementById("relevantOption").disabled = true;
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sortedAtlas = atlas.concat();
buildObjectsList(null, null);
} else {
document.getElementById("relevantOption").disabled = false;
buildObjectsList(this.value.toLowerCase(), "relevant");
}
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});
document.getElementById("sort").addEventListener("input", function(e){
entriesOffset = 0;
entriesList.innerHTML = "";
entriesList.appendChild(moreEntriesButton);
if(this.value != "relevant"){
defaultSort = this.value;
}
buildObjectsList(filterInput.value.toLowerCase(), this.value);
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});
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hideListButton.addEventListener("click", function(e){
entriesListShown = !entriesListShown;
if(entriesListShown){
wrapper.className = wrapper.className.replace(/ listHidden/g, "");
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} else {
wrapper.className += " listHidden";
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}
applyView();
render();
updateLines();
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return false;
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});
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closeObjectsListButton.addEventListener("click", function(e){
hovered = [];
objectsContainer.innerHTML = "";
updateLines();
closeObjectsListButton.className = "hidden";
fixed = false;
render();
});
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function shuffle(){
//console.log("shuffled atlas");
for (var i = sortedAtlas.length - 1; i > 0; i--) {
var j = Math.floor(Math.random() * (i + 1));
var temp = sortedAtlas[i];
sortedAtlas[i] = sortedAtlas[j];
sortedAtlas[j] = temp;
}
}
function createInfoBlock(entry){
var element = document.createElement("div");
element.className = "object";
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var html = "<h2><a href=\"?id="+entry.id+"\">"+entry.name+"</a></h2>";
if(entry.description){
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html += "<p>"+entry.description+"</p>";
}
if(entry.website){
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html += "<a target=\"_blank\" href="+entry.website+">Website</a>";
}
if(entry.subreddit){
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var subreddits = entry.subreddit.split(",");
for(var i in subreddits){
var subreddit = subreddits[i].trim();
if(subreddit.substring(0, 2) == "r/"){
subreddit = "/" + subreddit;
} else if(subreddit.substring(0, 1) != "/"){
subreddit = "/r/" + subreddit;
}
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html += "<a target=\"_blank\" href=https://reddit.com"+subreddit+">"+subreddit+"</a>";
}
}
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html+="<p style='font-family: Dejavu Sans Mono, sans, Sans-Serif;'>id: "+entry.id+"</p>";
element.innerHTML += html;
return element;
}
function highlightEntryFromUrl(){
var objectsContainer = document.getElementById("objectsList");
var id = 0;
var args = window.location.search;
if(args){
id = args.split("id=")[1];
if(id){
id = parseInt(id.split("&")[0]);
}
}
//var id = parseInt(window.location.hash.substring(3));
var entry = atlas.filter(function(e){
return e.id === id;
});
if (entry.length === 1){
entry = entry[0];
document.title = entry.name + " on the /r/place Atlas";
var infoElement = createInfoBlock(entry);
objectsContainer.innerHTML = "";
objectsContainer.appendChild(infoElement);
//console.log(entry.center[0]);
//console.log(entry.center[1]);
zoom = 4;
renderBackground(atlas);
applyView();
zoomOrigin = [
innerContainer.clientWidth/2 - entry.center[0]* zoom// + container.offsetLeft
,innerContainer.clientHeight/2 - entry.center[1]* zoom// + container.offsetTop
];
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scaleZoomOrigin = [
2000/2 - entry.center[0]// + container.offsetLeft
,2000/2 - entry.center[1]// + container.offsetTop
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];
//console.log(zoomOrigin);
applyView();
hovered = [entry];
render();
hovered[0].element = infoElement;
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closeObjectsListButton.className = "";
updateLines();
fixed = true;
}
}
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function updateHovering(e, tapped){
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if(!dragging && (!fixed || tapped)){
var pos = [
(e.clientX - (container.clientWidth/2 - innerContainer.clientWidth/2 + zoomOrigin[0] + container.offsetLeft))/zoom
,(e.clientY - (container.clientHeight/2 - innerContainer.clientHeight/2 + zoomOrigin[1] + container.offsetTop))/zoom
];
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if(pos[0] <= 2200 && pos[0] >= -100 && pos[0] <= 2200 && pos[0] >= -100){
var newHovered = [];
for(var i = 0; i < atlas.length; i++){
if(pointIsInPolygon(pos, atlas[i].path)){
newHovered.push(atlas[i]);
}
}
var changed = false;
if(hovered.length == newHovered.length){
for(var i = 0; i < hovered.length; i++){
if(hovered[i].id != newHovered[i].id){
changed = true;
break;
}
}
} else {
changed = true;
}
if(changed){
hovered = newHovered;
objectsContainer.innerHTML = "";
for(var i in hovered){
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var element = createInfoBlock(hovered[i]);
objectsContainer.appendChild(element);
hovered[i].element = element;
}
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if(hovered.length > 0){
closeObjectsListButton.className = "";
} else {
closeObjectsListButton.className = "hidden";
}
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render();
}
}
}
}
function buildObjectsList(filter, sort){
if(entriesList.contains(moreEntriesButton)){
entriesList.removeChild(moreEntriesButton);
}
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if(!sortedAtlas){
sortedAtlas = atlas.concat();
document.getElementById("atlasSize").innerHTML = "The Atlas contains "+sortedAtlas.length+" entries.";
}
if(filter){
sortedAtlas = atlas.filter(function(value){
return (
value.name.toLowerCase().indexOf(filter) !== -1
|| value.description.toLowerCase().indexOf(filter) !== -1
);
});
document.getElementById("atlasSize").innerHTML = "Found "+sortedAtlas.length+" entries.";
} else {
document.getElementById("atlasSize").innerHTML = "The Atlas contains "+sortedAtlas.length+" entries.";
}
if(sort === null){
sort = defaultSort;
}
renderBackground(sortedAtlas);
render();
document.getElementById("sort").value = sort;
//console.log(sort);
var sortFunction;
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//console.log(sort);
switch(sort){
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case "shuffle":
sortFunction = null;
if(entriesOffset == 0){
shuffle();
}
break;
case "alphaAsc":
sortFunction = function(a, b){
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return a.name.toLowerCase().localeCompare(b.name.toLowerCase());
}
break;
case "alphaDesc":
sortFunction = function(a, b){
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return b.name.toLowerCase().localeCompare(a.name.toLowerCase());
}
break;
case "newest":
sortFunction = function(a, b){
if (a.id > b.id) {
return -1;
}
if (a.id < b.id) {
return 1;
}
// a must be equal to b
return 0;
}
break;
case "oldest":
sortFunction = function(a, b){
if (a.id < b.id) {
return -1;
}
if (a.id > b.id) {
return 1;
}
// a must be equal to b
return 0;
}
break;
case "relevant":
sortFunction = function(a, b){
if(a.name.toLowerCase().indexOf(filter) !== -1 && b.name.toLowerCase().indexOf(filter) !== -1){
if (a.name.toLowerCase().indexOf(filter) < b.name.toLowerCase().indexOf(filter)) {
return -1;
}
else if (a.name.toLowerCase().indexOf(filter) > b.name.toLowerCase().indexOf(filter)) {
return 1;
} else {
return a.name.toLowerCase().localeCompare(b.name.toLowerCase());
}
} else if(a.name.toLowerCase().indexOf(filter) !== -1){
return -1;
} else if(b.name.toLowerCase().indexOf(filter) !== -1){
return 1;
} else {
if (a.description.toLowerCase().indexOf(filter) < b.description.toLowerCase().indexOf(filter)) {
return -1;
}
else if (a.description.toLowerCase().indexOf(filter) > b.description.toLowerCase().indexOf(filter)) {
return 1;
} else {
return a.name.toLowerCase().localeCompare(b.name.toLowerCase());
}
}
}
break;
}
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if(sortFunction){
sortedAtlas.sort(sortFunction);
}
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for(var i = entriesOffset; i < entriesOffset+entriesLimit; i++){
if(i >= sortedAtlas.length){
break;
}
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var element = createInfoBlock(sortedAtlas[i]);
element.entry = sortedAtlas[i];
element.addEventListener("mouseenter", function(e){
if(!fixed && !dragging){
objectsContainer.innerHTML = "";
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previousZoomOrigin = [zoomOrigin[0], zoomOrigin[1]];
previousScaleZoomOrigin = [scaleZoomOrigin[0], scaleZoomOrigin[1]];
applyView();
zoomOrigin = [
innerContainer.clientWidth/2 - this.entry.center[0]* zoom// + container.offsetLeft
,innerContainer.clientHeight/2 - this.entry.center[1]* zoom// + container.offsetTop
]
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scaleZoomOrigin = [
2000/2 - this.entry.center[0]
,2000/2 - this.entry.center[1]
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]
//console.log(zoomOrigin);
applyView();
hovered = [this.entry];
render();
hovered[0].element = this;
updateLines();
}
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});
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element.addEventListener("click", function(e){
toggleFixed(e);
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if(fixed){
previousZoomOrigin = [zoomOrigin[0], zoomOrigin[1]];
previousScaleZoomOrigin = [scaleZoomOrigin[0], scaleZoomOrigin[1]];
applyView();
}
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if(document.documentElement.clientWidth < 500){
objectsContainer.innerHTML = "";
entriesListShown = false;
wrapper.className += " listHidden";
zoom = 4;
renderBackground(atlas);
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applyView();
zoomOrigin = [
innerContainer.clientWidth/2 - this.entry.center[0]* zoom// + container.offsetLeft
,innerContainer.clientHeight/2 - this.entry.center[1]* zoom// + container.offsetTop
]
scaleZoomOrigin = [
2000/2 - this.entry.center[0]
,2000/2 - this.entry.center[1]
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]
previousZoomOrigin = [zoomOrigin[0], zoomOrigin[1]];
previousScaleZoomOrigin = [scaleZoomOrigin[0], scaleZoomOrigin[1]];
fixed = true;
hovered = [this.entry];
hovered[0].element = this;
applyView();
render();
updateLines();
}
});
element.addEventListener("mouseleave", function(e){
if(!fixed && !dragging){
zoomOrigin = [previousScaleZoomOrigin[0]*zoom, previousScaleZoomOrigin[1]*zoom];
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scaleZoomOrigin = [previousScaleZoomOrigin[0], previousScaleZoomOrigin[1]];
applyView();
hovered = [];
updateLines();
render();
}
});
entriesList.appendChild(element);
}
entriesOffset += entriesLimit;
if(sortedAtlas.length > entriesOffset){
moreEntriesButton.innerHTML = "Show "+Math.min(entriesLimit, sortedAtlas.length - entriesOffset)+" more";
entriesList.appendChild(moreEntriesButton);
}
}
function render(){
context.clearRect(0, 0, canvas.width, canvas.height);
//canvas.width = 1000*zoom;
//canvas.height = 1000*zoom;
context.globalCompositeOperation = "source-over";
context.clearRect(0, 0, canvas.width, canvas.height);
if(hovered.length > 0){
container.style.cursor = "pointer";
} else {
container.style.cursor = "default";
}
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for(var i = 0; i < hovered.length; i++){
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var path = hovered[i].path;
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context.beginPath();
if(path[0]){
//context.moveTo(path[0][0]*zoom, path[0][1]*zoom);
context.moveTo(path[0][0], path[0][1]);
}
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for(var p = 1; p < path.length; p++){
//context.lineTo(path[p][0]*zoom, path[p][1]*zoom);
context.lineTo(path[p][0], path[p][1]);
}
context.closePath();
context.globalCompositeOperation = "source-over";
context.fillStyle = "rgba(0, 0, 0, 1)";
context.fill();
}
context.globalCompositeOperation = "source-out";
context.drawImage(backgroundCanvas, 0, 0);
for(var i = 0; i < hovered.length; i++){
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var path = hovered[i].path;
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context.beginPath();
if(path[0]){
//context.moveTo(path[0][0]*zoom, path[0][1]*zoom);
context.moveTo(path[0][0], path[0][1]);
}
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for(var p = 1; p < path.length; p++){
//context.lineTo(path[p][0]*zoom, path[p][1]*zoom);
context.lineTo(path[p][0], path[p][1]);
}
context.closePath();
context.globalCompositeOperation = "source-over";
context.strokeStyle = "rgba(0, 0, 0, 1)";
//context.lineWidth = zoom;
context.stroke();
}
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}
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function toggleFixed(e, tapped){
if(!fixed && hovered.length == 0){
return 0;
}
fixed = !fixed;
if(!fixed){
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updateHovering(e, tapped);
render();
}
}
window.addEventListener("resize", updateLines);
window.addEventListener("mousemove", updateLines);
window.addEventListener("dblClick", updateLines);
window.addEventListener("wheel", updateLines);
container.addEventListener("mousedown", function(e){
lastPos = [
e.clientX
,e.clientY
];
});
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container.addEventListener("touchstart", function(e){
if(e.touches.length == 1){
lastPos = [
e.touches[0].clientX
,e.touches[0].clientY
];
}
});
container.addEventListener("mouseup", function(e){
if(Math.abs(lastPos[0] - e.clientX) + Math.abs(lastPos[1] - e.clientY) <= 4){
toggleFixed(e);
}
});
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container.addEventListener("touchend", function(e){
//console.log(e);
//console.log(e.changedTouches[0].clientX);
if(e.changedTouches.length == 1){
e = e.changedTouches[0];
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//console.log(lastPos[0] - e.clientX);
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if(Math.abs(lastPos[0] - e.clientX) + Math.abs(lastPos[1] - e.clientY) <= 4){
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//console.log("Foo!!");
dragging = false;
fixed = false;
setTimeout(
function(){
updateHovering(e, true);
}
, 10);
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}
}
});
objectsContainer.addEventListener("scroll", function(e){
updateLines();
});
window.addEventListener("resize", function(){
//console.log(document.documentElement.clientWidth, document.documentElement.clientHeight);
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var viewportWidth = document.documentElement.clientWidth;
if(document.documentElement.clientWidth > 2000 && viewportWidth <= 2000){
entriesListShown = true;
wrapper.className = wrapper.className.replace(/ listHidden/g, "");
}
if(document.documentElement.clientWidth < 2000 && viewportWidth >= 2000){
entriesListShown = false;
wrapper.className += " listHidden";
}
viewportWidth = document.documentElement.clientWidth;
applyView();
render();
updateLines();
});
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}