267 lines
8.9 KiB
JavaScript
267 lines
8.9 KiB
JavaScript
const socket = new WebSocket("ws://localhost:7865");
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var canvas = document.getElementById("board");
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var colorInput = document.getElementById("color");
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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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var currentColor = "#000000"
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canvas.width = 1920;
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canvas.height = 1080;
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canvasHidden.width = 1920;
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canvasHidden.height = 1080;
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var imgData = ctx2.createImageData(canvasHidden.width, canvasHidden.height)
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function drawPixel(x, y, color) {
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let pixelNumber;
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if (y > 0)
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pixelNumber = (y) * canvas.width + x
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if (y == 0)
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pixelNumber = x
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if (color == undefined) rgbColor = hexToRgb(currentColor);
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for (let l = 0; l < 4; l ++)
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for (let l = 0; l < 5; l ++){
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imgData.data[pixelNumber + 0] = color == undefined? rgbColor.r : color.r;
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imgData.data[pixelNumber + 1] = color == undefined? rgbColor.g : color.g;
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imgData.data[pixelNumber + 2] = color == undefined? rgbColor.b : color.b;
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imgData.data[pixelNumber + 3] = 255;
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}
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redraw();
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}
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function redraw() {
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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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ctx2.putImageData(imgData, 0, 0);
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ctx.drawImage(canvasHidden, 0, 0)
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ctx.imageSmoothingEnabled = false
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}
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socket.addEventListener("open", (event) => {
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socket.send("{\"code\":0}");
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});
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socket.addEventListener("message", (event) => {
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// console.log("Message from server ", JSON.stringify(event.data.toString()));
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event.data.text().then(function(packet){
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packet = JSON.parse(packet)
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let code = packet.code
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let content = packet.content
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switch (code){
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case 0:
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//Ineffective way to do that, fix that later ;)
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let converted = Uint8ClampedArray.from(content)
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for (let i = 0; i < converted.length; i ++)
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imgData.data[i] = converted[i]
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redraw();
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break;
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case 1:
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contentJson = JSON.parse(content);
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let color = {
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r: contentJson.r,
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g: contentJson.g,
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b: contentJson.b
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}
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drawPixel(contentJson.x * 4, contentJson.y * 4, color)
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redraw();
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break;
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}
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});
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});
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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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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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if (evt.button == 1 || 1 == evt.button&2){
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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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}
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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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if (evt.button == 1 || 1 == evt.button&2){
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dragStart = null;
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if (dragged) {
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let point = ctx.transformedPoint(
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evt.clientX - canvas.offsetLeft,
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evt.clientY - canvas.offsetTop
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);
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} else {
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let point = {
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x: Math.floor(ctx.transformedPoint(lastX,lastY).x) * 4,
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y: Math.floor(ctx.transformedPoint(lastX,lastY).y) * 4,
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};
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x = point.x; y = point.y;
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let pixelNumber;
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if (y > 0)
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pixelNumber = (y) * canvas.width + x
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if (y == 0)
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pixelNumber = x
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let color = {
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r: imgData.data[pixelNumber + 0],
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g: imgData.data[pixelNumber + 1],
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b: imgData.data[pixelNumber + 2]
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};
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changeColor(rgbToHex(color.r, color.g, color.b));
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}
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} else if (evt.button == 0) {
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let point = {
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x: Math.floor(ctx.transformedPoint(lastX,lastY).x) * 4,
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y: Math.floor(ctx.transformedPoint(lastX,lastY).y) * 4,
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};
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let rgbColor = hexToRgb(currentColor);
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let pixel = JSON.stringify({
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"x": `${point.x/4}`,
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"y": `${point.y/4}`,
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"r": `${rgbColor.r}`,
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"g": `${rgbColor.g}`,
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"b": `${rgbColor.b}`
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});
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let packet = {
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"code": 1,
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"content": pixel
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}
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socket.send(JSON.stringify(packet));
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// console.log(`{\"code\":1, \"content\":${pixel}}`)
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drawPixel(point.x, point.y, undefined);
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}
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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 evaulatePixelNumber(x, y) {
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let pixelNumber;
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if (y > 0)
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pixelNumber = (y) * canvas.width + x
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if (y == 0)
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pixelNumber = x
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return pixelNumber
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}
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function changeColor(color) {
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if (color == undefined) currentColor = colorInput.value;
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else {
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currentColor = color
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colorInput.value = color
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}
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}
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//Code from https://stackoverflow.com/questions/5623838/rgb-to-hex-and-hex-to-rgb#5624139
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function hexToRgb(hex) {
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// Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF")
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var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
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hex = hex.replace(shorthandRegex, function(m, r, g, b) {
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return r + r + g + g + b + b;
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});
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var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
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return result ? {
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r: parseInt(result[1], 16),
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g: parseInt(result[2], 16),
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b: parseInt(result[3], 16)
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} : null;
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}
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const rgbToHex = (r, g, b) => '#' + [r, g, b].map(x => {
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const hex = x.toString(16)
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return hex.length === 1 ? '0' + hex : hex
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}).join('')
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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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} |