Added index.html
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<!DOCTYPE html>
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<html>
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<head>
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<title>Pixel Battle</title>
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<meta charset="UTF-8">
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</head>
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<body>
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<canvas id="board" width="1920" height="1080" style="border:1px solid #000000;" display="block">
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<canvas hidden id="hidden" width="1920" height="1080" style="border:1px solid #000000;" display="block">
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</canvas>
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<script>
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var canvas = document.getElementById("board");
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var canvasHidden = document.getElementById("hidden");
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var ctx = canvas.getContext("2d");
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var ctx2 = canvasHidden.getContext("2d");
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canvas.width = 1920;
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canvas.height = 1080;
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var imgData = ctx2.createImageData(canvasHidden.width, canvasHidden.height)
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// All the code that is making zooms and moving around cavnas is made with big help of http://phrogz.net/tmp/canvas_zoom_to_cursor.html. Thanks alot!
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window.onload = function() {
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var ctx = canvas.getContext("2d");
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trackTransforms(ctx);
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function redraw(x ,y) {
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ctx.save();
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ctx.setTransform(1,0,0,1,0,0);
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ctx.clearRect(0,0,canvas.width,canvas.height);
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ctx.restore();
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for (let i = 0; i < 1000; i += 4) {
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imgData.data[i+0] = 255;
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imgData.data[i+1] = 0;
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imgData.data[i+2] = 0;
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imgData.data[i+3] = 255;
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}
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ctx2.putImageData(imgData, 10, 50);
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ctx.drawImage(canvasHidden, 0, 0)
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}
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function drawPixel(x, y, color) {
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let pixelNumber = y * canvas.width + x // THIS IS NOT CORRECT. MUST BE FIXED
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for (let i = 0; i < 4; i ++)
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imgData.data[pixelNumber+i] = color[i]
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redraw();
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}
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redraw();
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var lastX=canvas.width/2, lastY=canvas.height/2;
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var dragStart,dragged;
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canvas.addEventListener('mousedown',function(evt){
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document.body.style.mozUserSelect = document.body.style.webkitUserSelect = document.body.style.userSelect = 'none';
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lastX = evt.offsetX || (evt.pageX - canvas.offsetLeft);
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lastY = evt.offsetY || (evt.pageY - canvas.offsetTop);
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dragStart = ctx.transformedPoint(lastX,lastY);
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dragged = false;
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},false);
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canvas.addEventListener('mousemove',function(evt){
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lastX = evt.offsetX || (evt.pageX - canvas.offsetLeft);
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lastY = evt.offsetY || (evt.pageY - canvas.offsetTop);
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dragged = true;
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if (dragStart){
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var pt = ctx.transformedPoint(lastX,lastY);
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ctx.translate(pt.x-dragStart.x,pt.y-dragStart.y);
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redraw();
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}
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},false);
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canvas.addEventListener('mouseup',function(evt){
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dragStart = null;
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if (!dragged) drawPixel(
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Math.round(ctx.transformedPoint(lastX,lastY).x),
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Math.round(ctx.transformedPoint(lastX,lastY).y)
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)
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// if (!dragged) zoom(evt.shiftKey ? -1 : 1 );
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},false);
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var scaleFactor = 1.1;
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var zoom = function(clicks){
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var pt = ctx.transformedPoint(lastX,lastY);
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ctx.translate(pt.x,pt.y);
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var factor = Math.pow(scaleFactor,clicks);
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ctx.scale(factor,factor);
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ctx.translate(-pt.x,-pt.y);
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redraw();
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}
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var handleScroll = function(evt){
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var delta = evt.wheelDelta ? evt.wheelDelta/40 : evt.detail ? -evt.detail : 0;
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if (delta) zoom(delta);
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return evt.preventDefault() && false;
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};
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canvas.addEventListener('DOMMouseScroll',handleScroll,false);
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canvas.addEventListener('mousewheel',handleScroll,false);
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};
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function trackTransforms(ctx){
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var svg = document.createElementNS("http://www.w3.org/2000/svg",'svg');
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var xform = svg.createSVGMatrix();
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ctx.getTransform = function(){ return xform; };
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var savedTransforms = [];
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var save = ctx.save;
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ctx.save = function(){
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savedTransforms.push(xform.translate(0,0));
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return save.call(ctx);
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};
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var restore = ctx.restore;
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ctx.restore = function(){
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xform = savedTransforms.pop();
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return restore.call(ctx);
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};
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var scale = ctx.scale;
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ctx.scale = function(sx,sy){
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xform = xform.scaleNonUniform(sx,sy);
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return scale.call(ctx,sx,sy);
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};
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var rotate = ctx.rotate;
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ctx.rotate = function(radians){
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xform = xform.rotate(radians*180/Math.PI);
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return rotate.call(ctx,radians);
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};
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var translate = ctx.translate;
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ctx.translate = function(dx,dy){
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xform = xform.translate(dx,dy);
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return translate.call(ctx,dx,dy);
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};
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var transform = ctx.transform;
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ctx.transform = function(a,b,c,d,e,f){
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var m2 = svg.createSVGMatrix();
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m2.a=a; m2.b=b; m2.c=c; m2.d=d; m2.e=e; m2.f=f;
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xform = xform.multiply(m2);
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return transform.call(ctx,a,b,c,d,e,f);
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};
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var setTransform = ctx.setTransform;
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ctx.setTransform = function(a,b,c,d,e,f){
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xform.a = a;
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xform.b = b;
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xform.c = c;
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xform.d = d;
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xform.e = e;
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xform.f = f;
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return setTransform.call(ctx,a,b,c,d,e,f);
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};
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var pt = svg.createSVGPoint();
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ctx.transformedPoint = function(x,y){
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pt.x=x; pt.y=y;
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return pt.matrixTransform(xform.inverse());
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}
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}
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</script>
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</body>
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</html>
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