atlas/view.js

251 lines
6.6 KiB
JavaScript

/*
========================================================================
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:
https://draemm.li/various/place-atlas/license.txt
========================================================================
*/
function initView(){
var objectsContainer = document.getElementById("objectsList");
var linesCanvas = document.getElementById("linesCanvas");
var linesContext = linesCanvas.getContext("2d");
var backgroundCanvas = document.createElement("canvas");
backgroundCanvas.width = 1000;
backgroundCanvas.height = 1000;
var backgroundContext = backgroundCanvas.getContext("2d");
var hovered = [];
var lastPos = [0, 0];
var fixed = false; // Fix hovered items in place, so that clicking on links is possible
renderBackground();
render();
container.addEventListener("mousemove", function(e){
updateHovering(e);
});
function updateHovering(e){
if(!dragging && !fixed){
var pos = [
(e.clientX - (container.clientWidth/2 - innerContainer.clientWidth/2 + zoomOrigin[0]))/zoom
,(e.clientY - (container.clientHeight/2 - innerContainer.clientHeight/2 + zoomOrigin[1]))/zoom
];
if(pos[0] <= 1000 && pos[0] >= 0 && pos[0] <= 1000 && pos[0] >= 0){
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;
render();
}
}
}
}
function renderBackground(){
backgroundContext.clearRect(0, 0, canvas.width, canvas.height);
backgroundContext.fillStyle = "rgba(0, 0, 0, 0.6)";
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.strokeStyle = "rgba(255, 255, 255, 1)";
backgroundContext.stroke();
}
}
function render(){
context.globalCompositeOperation = "source-over";
context.clearRect(0, 0, canvas.width, canvas.height);
objectsContainer.innerHTML = "";
if(hovered.length > 0){
container.style.cursor = "pointer";
} else {
container.style.cursor = "default";
}
for(var i = 0; i < hovered.length; i++){
var element = document.createElement("div");
element.className = "object";
var html = '<h2>'+hovered[i].name+'</h2>';
if(hovered[i].description){
html += '<p>'+hovered[i].description+'</p>';
}
if(hovered[i].website){
html += '<a target="_blank" href='+hovered[i].website+'>Website</a>';
}
if(hovered[i].subreddit){
if(hovered[i].subreddit.substring(0, 2) == "r/"){
hovered[i].subreddit = "/" + hovered[i].subreddit;
} else if(hovered[i].subreddit.substring(0, 1) != "/"){
hovered[i].subreddit = "/r/" + hovered[i].subreddit;
}
html += '<a target="_blank" href=https://reddit.com'+hovered[i].subreddit+'>'+hovered[i].subreddit+'</a>';
}
element.innerHTML = html;
objectsContainer.appendChild(element);
hovered[i].element = element;
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.strokeStyle = "rgba(255, 255, 255, 1)";
//context.stroke();
context.globalCompositeOperation = "source-over";
context.fillStyle = "rgba(0, 0, 0, 1)";
context.fill();
}
updateLines();
context.globalCompositeOperation = "source-out";
context.drawImage(backgroundCanvas, 0, 0);
}
function toggleFixed(e){
if(!fixed && hovered.length == 0){
return 0;
}
fixed = !fixed;
if(!fixed){
updateHovering(e);
render();
}
}
function updateLines(){
linesCanvas.width = container.clientWidth;
linesCanvas.height = container.clientHeight;
linesContext.lineCap = "round";
linesContext.lineWidth = Math.max(Math.min(zoom*1.5, 16*1.5), 1);
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.lineTo(
~~(hovered[i].center[0]*zoom) + innerContainer.offsetLeft// + container.clientWidth/2 - innerContainer.clientWidth/2
,~~(hovered[i].center[1]*zoom) + innerContainer.offsetTop - 50// + container.clientHeight/2 - innerContainer.clientHeight/2
);
linesContext.stroke();
}
linesContext.lineWidth = Math.max(Math.min(zoom, 16), 1);
linesContext.strokeStyle = "#FFFFFF";
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.lineTo(
~~(hovered[i].center[0]*zoom) + innerContainer.offsetLeft// + container.clientWidth/2 - innerContainer.clientWidth/2
,~~(hovered[i].center[1]*zoom) + innerContainer.offsetTop - 50// + container.clientHeight/2 - innerContainer.clientHeight/2
);
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);
}
});
}