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@@ -0,0 +1,315 @@
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+const canvas = document.getElementById('canvas')
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+const ctx = canvas.getContext('2d')
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+
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+const width = canvas.width;
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+const height = canvas.height;
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+
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+let current;
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+let selection = []
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+
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+const tools = {
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+ graffity: {
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+ mousemove(e){ //e.buttons 0b00000x11 & 0b00000100 == x
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+ (e.buttons & 1) && new Circle(e.clientX, e.clientY, +size.value, color.value)
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+ }
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+ },
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+ circle: {
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+ mousedown(e){
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+ current = new Circle(e.clientX,e.clientY, 1, color.value)
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+ },
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+ mousemove(e){
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+ if (!current) return;
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+
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+ current.radius = current.distanceTo(e.clientX, e.clientY)
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+ Drawable.drawAll()
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+ },
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+
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+ mouseup(e){
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+ current = null
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+ }
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+ },
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+ line: {
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+ mousedown(e){
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+ current = new Line(e.clientX, e.clientY, 0, 0, color.value, +size.value)
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+ },
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+ mousemove(e){
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+ if (!current) return;
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+
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+ current.width = e.clientX - current.x
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+ current.height = e.clientY - current.y
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+
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+ Drawable.drawAll()
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+ },
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+
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+ mouseup(e){
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+ current = null
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+ }
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+ },
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+ rectangle: {
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+ mousedown(e){
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+ current = new Rectangle(e.clientX, e.clientY, 0, 0, color.value)
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+ },
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+ mousemove(e){
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+ if (!current) return;
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+
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+ current.width = e.clientX - current.x
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+ current.height = e.clientY - current.y
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+
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+ Drawable.drawAll()
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+ },
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+
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+ mouseup(e){
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+ current = null
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+ }
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+ },
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+ ellipse: {
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+ mousedown(e) {
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+ current = new Ellipse(e.clientX, e.clientY, 0, 0, color.value)
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+ },
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+ mousemove(e) {
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+ if (!current) return;
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+
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+ let resultX = e.clientX - current.x;
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+ let resultY = e.clientY - current.y;
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+ current.radiusX = resultX > 0 ? resultX : -resultX;
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+ current.radiusY = resultY > 0 ? resultY : - resultY;
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+
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+ Drawable.drawAll()
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+ },
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+
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+ mouseup(e) {
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+ current = null
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+ }
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+ },
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+ square: {
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+ mousedown(e){
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+ current = new Square(e.clientX, e.clientY, 0, color.value)
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+ },
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+ mousemove(e){
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+ if (!current) return;
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+
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+ current.width = e.clientX - current.x
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+
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+ Drawable.drawAll()
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+ },
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+
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+ mouseup(e){
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+ current = null
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+ }
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+ },
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+ select: {
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+ click(e){
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+ console.log(e)
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+ let found = Drawable.instances.filter(c => c.in && c.in(e.clientX, e.clientY))
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+ if (found.length){
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+ if (e.ctrlKey){
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+ selection.push(found.pop())
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+ }
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+ else {
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+ selection = [found.pop()]
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+ }
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+ }
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+ else {
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+ if (!e.ctrlKey) selection = []
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+ }
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+
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+ Drawable.drawAll(selection)
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+ },
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+ mousedown(e){
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+ current = new Rectangle(e.clientX, e.clientY, 0, 0, color.value)
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+ },
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+ mousemove(e){
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+ if (!current) return;
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+
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+ current.width = e.clientX - current.x
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+ current.height = e.clientY - current.y
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+
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+ Drawable.drawAll()
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+ },
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+ mouseup(e){
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+ current = null
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+ //x,y, w, h прямоугольника
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+ //selection - только те элеменеты Drawable.instances которые в границах прямоугольника.
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+ },
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+ }
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+}
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+
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+function superHandler(evt){
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+ let t = tools[tool.value]
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+ if (typeof t[evt.type] === 'function')
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+ t[evt.type].call(this, evt)
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+}
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+
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+canvas.onmousemove = superHandler
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+canvas.onmouseup = superHandler
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+canvas.onmousedown = superHandler
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+canvas.onclick = superHandler
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+
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+function Drawable(){
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+ Drawable.addInstance(this);
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+}
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+
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+const distance = (x1,y1, x2, y2) => ((x1-x2)**2 + (y1-y2)**2)**0.5
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+
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+Drawable.prototype.draw = function(){};
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+Drawable.prototype.distanceTo = function(x,y){
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+ if (typeof this.x !== 'number' ||
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+ typeof this.y !== 'number'){
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+ return NaN
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+ }
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+ return distance(this.x, this.y, x, y)
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+}
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+
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+Drawable.instances = [];
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+Drawable.addInstance = function(item){
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+ Drawable.instances.push(item);
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+}
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+
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+Drawable.drawAll = function(selection=[]){
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+ ctx.clearRect(0,0,width,height);
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+ Drawable.forAll(item => item.draw())
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+ selection.forEach(item => item.draw(true))
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+}
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+
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+Drawable.forAll = function(callback){
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+ for(var i = 0; i<Drawable.instances.length;i++){
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+ callback(Drawable.instances[i])
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+ }
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+}
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+
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+class Circle extends Drawable {
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+ constructor(x,y,radius, color){
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+ super()
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+ this.x = x;
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+ this.y = y;
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+ this.radius = radius;
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+ this.color = color;
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+
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+ this.draw();
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+ }
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+
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+ draw(){
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+ ctx.beginPath();
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+ ctx.arc(this.x, this.y, this.radius, 0, 2 * Math.PI);
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+ ctx.closePath();
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+ ctx.fillStyle = this.color;
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+ ctx.fill(); // рисует закрашенный circle
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+ // ctx.stroke(); // рисует границы circle
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+ }
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+
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+ in(x,y){
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+ return this.distanceTo(x,y) < this.radius
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+ }
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+
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+ inBounds(x,y,w,h){ // x = 100, this.x = 102, w = 5
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+ return this.x >= x && this.x <= x + w &&
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+ this.y >= y && this.y <= y + h
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+ }
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+}
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+
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+class Line extends Drawable {
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+ constructor(x,y, width, height, color, lineWidth){
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+ super()
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+ this.x = x;
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+ this.y = y;
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+ this.width = width;
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+ this.height = height;
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+ this.color = color;
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+ this.lineWidth = lineWidth; // можно задавать любую ширину
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+
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+ this.draw();
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+ }
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+
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+ draw(){
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+ ctx.beginPath();
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+ ctx.moveTo(this.x, this.y);
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+ ctx.lineTo(this.x + this.width, this.y + this.height);
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+ ctx.closePath();
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+ ctx.strokeStyle = this.color;
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+ ctx.lineWidth = this.lineWidth
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+ ctx.stroke();
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+ }
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+}
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+
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+class Rectangle extends Drawable {
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+ constructor(x,y, width, height, color){
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+ super()
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+ this.x = x;
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+ this.y = y;
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+ this.width = width;
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+ this.height = height;
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+ this.color = color;
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+
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+ this.draw();
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+ }
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+
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+ draw(){
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+ ctx.beginPath();
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+ ctx.strokeRect(this.x, this.y, this.width, this.height); // рисует границы rectangle
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+ // ctx.fillRect(this.x, this.y, this.width, this.height); // рисует закрашенный rectangle
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+ ctx.fillStyle = this.color;
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+ ctx.fill();
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+ }
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+}
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+
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+class Ellipse extends Drawable {
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+ constructor(x, y, radiusX, radiusY, color) {
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+ super()
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+ this.x = x;
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+ this.y = y;
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+ this.radiusX = radiusX;
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+ this.radiusY = radiusY;
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+ this.color = color;
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+
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+
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+ this.draw();
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+ }
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+
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+ draw() {
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+ ctx.beginPath();
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+ ctx.ellipse(this.x, this.y, this.radiusX, this.radiusY, 0, 0, 2 * Math.PI);
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+ ctx.closePath();
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+ ctx.fillStyle = this.color;
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+ // ctx.fill(); // рисует закрашенный ellipse
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+ ctx.stroke(); // рисует границы ellipse
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+ }
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+}
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+
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+class Square extends Drawable {
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+ constructor(x, y, width, color){
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+ super()
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+ this.x = x;
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+ this.y = y;
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+ this.width = width;
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+ this.color = color;
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+
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+ this.draw();
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+ }
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+
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+ draw(){
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+ ctx.beginPath();
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+ ctx.strokeRect(this.x, this.y, this.width, this.width); // рисует границы square
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+ // ctx.fillRect(this.x, this.y, this.width, this.width); // рисует закрашенный square
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+ ctx.fillStyle = this.color;
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+ ctx.fill();
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+ }
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+}
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+
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+color.onchange = () => {
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+ selection.forEach(c => c.color = color.value)
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+ Drawable.drawAll(selection)
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+}
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+
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+document.getElementById('delete').onclick = () =>{
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+ Drawable.instances = Drawable.instances.filter(item => !selection.includes(item))
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+ selection = []
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+ Drawable.drawAll()
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+}
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+
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+undo.onclick = function () {
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+ var popped = Drawable.instances.pop(); // удаление последнего элемента в массиве
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+ console.log(popped);
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+ // var epmted = Drawable.instances = []; // очищение массива полностью
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+ // console.log(epmted);
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+ Drawable.drawAll()
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+}
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Евгения Акиншина