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@@ -0,0 +1,362 @@
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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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+let xxx
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+let yyy
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+let selectWidth
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+let selectHeight
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+let cyka
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+let blyat
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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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+ ellipse: {
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+ mousedown(e) {
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+ current = new Ellipse(e.clientX, e.clientY, 5, 5, Math.PI / 2, 0, 2 * Math.PI, 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.radiusX = Math.abs(e.clientY - current.y)
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+ current.radiusY = Math.abs(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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+ 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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+ rect: {
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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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+ if (current.width < 0) {
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+ current.x = current.x + current.width
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+ current.width = Math.abs(current.width)
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+ }
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+ if (current.height < 0) {
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+ current.y = current.y + current.height
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+ current.height = Math.abs(current.height)
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+ }
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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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+ if (!blyat) {
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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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+ cyka = false
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+ blyat = false
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+ },
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+ mousedown(e) {
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+ xxx = e.clientX,
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+ yyy = e.clientY
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+ cyka = true
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+ current = new RectangleForSelect(xxx, yyy, selectWidth, selectHeight)
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+ },
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+ mousemove(e) {
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+ if (cyka && current) {
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+ blyat = true
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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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+ selectWidth = current.width
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+ selectHeight = current.height
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+
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+ Drawable.drawAll(selection)
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+ }
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+ },
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+
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+ mouseup(e) {
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+ if (current.width < 0) {
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+ xxx += current.width
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+ selectWidth = Math.abs(current.width)
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+ }
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+ if (current.height < 0) {
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+ yyy += current.height
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+ selectHeight = Math.abs(current.height)
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+ }
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+ Drawable.instances.pop()
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+ current = null
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+
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+ let found = Drawable.instances.filter(c => c.inBounds && c.inBounds(xxx, yyy, selectWidth, selectHeight))
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+ if (found.length) {
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+ selection.push(...found)
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+ } else {
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+ selection = [...selection]
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+ }
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+ Drawable.drawAll(selection)
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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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+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(selected){
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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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+ if (selected){
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+ ctx.lineWidth = 5
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+ ctx.strokeStyle = 'yellow'
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+ ctx.stroke();
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+ }
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+ ctx.fill();
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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;
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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.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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+
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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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+
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+ draw(selected) {
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+ ctx.beginPath();
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+ ctx.rect(this.x, this.y, this.width, this.height);
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+ ctx.closePath();
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+ ctx.fillStyle = this.color;
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+ if (selected) {
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+ ctx.lineWidth = 5
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+ ctx.strokeStyle = 'yellow'
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+ ctx.stroke();
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+ }
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+ ctx.fill();
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+ }
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+
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+ in(x,y){
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+ return x > this.x && y > this.y && x < this.x + this.width && y < this.y + this.height
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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 + this.width <= x + w &&
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+ this.y >= y && this.y + this.height <= y + h
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+ }
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+}
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+
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+class RectangleForSelect extends Rectangle {
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+ constructor(x, y, width, height) {
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+ super(x, y, width, height)
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+ }
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+
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+ draw() {
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+ ctx.beginPath();
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+ ctx.rect(this.x, this.y, this.width, this.height);
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+ ctx.closePath();
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+ ctx.strokeStyle = 'black'
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+ ctx.lineWidth = '2'
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+ ctx.stroke();
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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, rotation, startAngle, endAngle, 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.rotation = rotation;
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+ this.startAngle = startAngle
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+ this.endAngle = endAngle
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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(selected){
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+ ctx.beginPath();
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+ ctx.ellipse(this.x, this.y, this.radiusX, this.radiusY, this.rotation, this.startAngle, this.endAngle);
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+ ctx.closePath();
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+ ctx.fillStyle = this.color;
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+ if (selected){
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+ ctx.lineWidth = 5
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+ ctx.strokeStyle = 'yellow'
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+ ctx.stroke();
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+ }
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+ ctx.fill();
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+ }
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+
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+ in(x,y){
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+ return (Math.abs(y - this.y) < this.radiusX && Math.abs(x - this.x) < this.radiusY)
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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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+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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+ Drawable.instances.pop()
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+ Drawable.drawAll()
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+}
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