atlas/web/_js/overlap.js

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/*
========================================================================
The /r/place Atlas
An Atlas of Reddit's /r/place, with information to each
artwork of the canvas provided by the community.
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
========================================================================
*/
function initOverlap(){
var wrapper = document.getElementById("wrapper");
var objectsContainer = document.getElementById("objectsList");
var linesCanvas = document.getElementById("linesCanvas");
var linesContext = linesCanvas.getContext("2d");
var backgroundCanvas = document.createElement("canvas");
backgroundCanvas.width = 2000;
backgroundCanvas.height = 2000;
var backgroundContext = backgroundCanvas.getContext("2d");
var filterInput = document.getElementById("searchList");
var entriesList = document.getElementById("entriesList");
var hideListButton = document.getElementById("hideListButton");
var entriesListShown = true;
var entriesLimit = 50;
var entriesOffset = 0;
var moreEntriesButton = document.createElement("button");
moreEntriesButton.innerHTML = "Show "+entriesLimit+" more";
moreEntriesButton.id = "moreEntriesButton";
moreEntriesButton.onclick = function(){
buildObjectsList();
};
var viewportWidth = document.documentElement.clientWidth;
var hovered = [];
var lastPos = [0, 0];
var fixed = false; // Fix hovered items in place, so that clicking on links is possible
renderBackground();
render();
buildObjectsList();
// 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();
}
}
container.addEventListener("mousemove", function(e){
updateHovering(e);
});
filterInput.addEventListener("input", function(e){
entriesOffset = 0;
entriesList.innerHTML = "";
entriesList.appendChild(moreEntriesButton);
buildObjectsList(this.value.toLowerCase());
});
document.getElementById("sort").addEventListener("input", function(e){
entriesOffset = 0;
entriesList.innerHTML = "";
entriesList.appendChild(moreEntriesButton);
buildObjectsList(filterInput.value.toLowerCase());
});
hideListButton.addEventListener("click", function(e){
entriesListShown = !entriesListShown;
if(entriesListShown){
wrapper.className = wrapper.className.replace(/ listHidden/g, "");
} else {
wrapper.className += " listHidden";
}
applyView();
updateHovering(e);
render();
updateLines();
});
function createInfoBlock(entry){
var element = document.createElement("div");
element.className = "object";
var html = '<h2><a href="?id='+entry.id+'">'+entry.name+'</a></h2>';
if(entry.description){
html += '<p>'+entry.description+'</p>';
}
if(entry.website){
html += '<a target="_blank" href='+entry.website+'>Website</a>';
}
if(entry.subreddit){
if(entry.subreddit.substring(0, 2) == "r/"){
entry.subreddit = "/" + entry.subreddit;
} else if(entry.subreddit.substring(0, 1) != "/"){
entry.subreddit = "/r/" + entry.subreddit;
}
html += '<a target="_blank" href=https://reddit.com'+entry.subreddit+'>'+entry.subreddit+'</a>';
}
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];
var infoElement = createInfoBlock(entry);
objectsContainer.innerHTML = "";
objectsContainer.appendChild(infoElement);
//console.log(entry.center[0]);
//console.log(entry.center[1]);
zoom = 4;
applyView();
zoomOrigin = [
innerContainer.clientWidth/2 - entry.center[0]* zoom// + container.offsetLeft
,innerContainer.clientHeight/2 - entry.center[1]* zoom// + container.offsetTop
];
//console.log(zoomOrigin);
applyView();
hovered = [entry];
render();
hovered[0].element = infoElement;
updateLines();
fixed = true;
}
}
function updateHovering(e){
if(!dragging && !fixed){
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
];
2022-04-03 21:38:16 +02:00
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){
var element = createInfoBlock(hovered[i]);
objectsContainer.appendChild(element);
hovered[i].element = element;
}
render();
}
}
}
}
function renderBackground(){
backgroundContext.clearRect(0, 0, canvas.width, canvas.height);
backgroundContext.fillStyle = "rgba(255, 255, 255, 1)";
backgroundContext.fillRect(0, 0, canvas.width, canvas.height);
for(var i = 0; i < atlas.length; i++){
var path = atlas[i].path;
backgroundContext.beginPath();
if(path[0]){
backgroundContext.moveTo(path[0][0], path[0][1]);
}
for(var p = 1; p < path.length; p++){
backgroundContext.lineTo(path[p][0], path[p][1]);
}
backgroundContext.closePath();
backgroundContext.fillStyle = "rgba(0, 0, 255, 0.2)";
backgroundContext.fill();
}
var pixels = backgroundContext.getImageData(0, 0, backgroundCanvas.width, backgroundCanvas.height).data;
var blank = 0;
for(var i = 0; i < pixels.length; i+=4){
if(pixels[i] == 255){
blank++;
}
}
console.log(blank+" blank pixels, which are "+Math.round(blank/100)/100+"% of the canvas ("+(100-Math.round(blank/100)/100)+"% mapped)");
}
function buildObjectsList(filter){
if(entriesList.contains(moreEntriesButton)){
entriesList.removeChild(moreEntriesButton);
}
var sortedAtlas;
if(filter){
sortedAtlas = atlas.filter(function(value){
return (value.name.toLowerCase().indexOf(filter) !== -1);
});
document.getElementById("atlasSize").innerHTML = "Found "+sortedAtlas.length+" entries.";
} else {
sortedAtlas = atlas.concat();
document.getElementById("atlasSize").innerHTML = "The Atlas contains "+sortedAtlas.length+" entries.";
}
var sort = document.getElementById("sort").value;
var sortFunction;
//console.log(sort);
switch(sort){
case "alphaAsc":
sortFunction = function(a, b){
return a.name.toLowerCase().localeCompare(b.name.toLowerCase());
}
break;
case "alphaDesc":
sortFunction = function(a, b){
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;
}
sortedAtlas.sort(sortFunction);
for(var i = entriesOffset; i < entriesOffset+entriesLimit; i++){
if(i >= sortedAtlas.length){
break;
}
var element = createInfoBlock(sortedAtlas[i]);
element.entry = sortedAtlas[i];
element.addEventListener("mouseenter", function(e){
if(!fixed && !dragging){
objectsContainer.innerHTML = "";
zoomOrigin = [
innerContainer.clientWidth/2 - this.entry.center[0]* zoom// + container.offsetLeft
,innerContainer.clientHeight/2 - this.entry.center[1]* zoom// + container.offsetTop
]
//console.log(zoomOrigin);
applyView();
hovered = [this.entry];
render();
hovered[0].element = this;
updateLines();
}
});
element.addEventListener("mouseleave", function(e){
if(!fixed && !dragging){
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.globalCompositeOperation = "source-over";
context.clearRect(0, 0, canvas.width, canvas.height);
if(hovered.length > 0){
container.style.cursor = "pointer";
} else {
container.style.cursor = "default";
}
for(var i = 0; i < hovered.length; i++){
var path = hovered[i].path;
context.beginPath();
if(path[0]){
context.moveTo(path[0][0], path[0][1]);
}
for(var p = 1; p < path.length; p++){
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++){
var path = hovered[i].path;
context.beginPath();
if(path[0]){
context.moveTo(path[0][0], path[0][1]);
}
for(var p = 1; p < path.length; p++){
context.lineTo(path[p][0], path[p][1]);
}
context.closePath();
context.globalCompositeOperation = "source-over";
context.strokeStyle = "rgba(0, 0, 0, 1)";
context.stroke();
}
}
function toggleFixed(e){
if(!fixed && hovered.length == 0){
return 0;
}
fixed = !fixed;
if(!fixed){
updateHovering(e);
render();
}
}
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;
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;
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();
}
}
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
];
});
container.addEventListener("mouseup", function(e){
if(Math.abs(lastPos[0] - e.clientX) + Math.abs(lastPos[1] - e.clientY) <= 4){
toggleFixed(e);
}
});
objectsContainer.addEventListener("scroll", function(e){
updateLines();
});
window.addEventListener("resize", function(){
//console.log(document.documentElement.clientWidth, document.documentElement.clientHeight);
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();
});
}