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@@ -0,0 +1,311 @@
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+const canvas = document.getElementById('canvas')
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+const ctx = canvas.getContext('2d')
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+const width = canvas.width;
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+const height = canvas.height;
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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){
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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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+ 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.altKey){
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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.altKey) 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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+ mousemove(e){},
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+ mouseup(e){},
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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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+ 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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+ }
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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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+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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+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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+ 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 = 2
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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){
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+ return this.x >= x && this.x <= x + w && 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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+ this.draw()
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+ }
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+ draw(selected){
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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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+ if (selected){
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+ ctx.strokeStyle = '#f0f'
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+ ctx.stroke()
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+ }
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+ ctx.stroke()
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+ }
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+ in(x, y) {
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+ let rotateLine = Math.atan2(this.height, this.width)
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+ let rotCursor = Math.atan2(y - this.y, x - this.x)
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+ let distanceToPoint = distance(x, y, this.x, this.y)
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+ let angleLine = rotCursor - rotateLine
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+ let rotateX = Math.cos(angleLine) * distanceToPoint
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+ let rotateY = Math.sin(angleLine) * distanceToPoint
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+ return rotateX >= 0 && rotateX <= this.length && rotateY <= this.lineWidth/2 && rotateY >= -this.lineWidth/2
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+ }
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+ get length(){
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+ return this.distanceTo(this.x + this.width, this.y + this.height)
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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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+ this.draw()
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+ }
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+ draw(selected){
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+ ctx.beginPath()
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+ ctx.moveTo(this.x, this.y)
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+ ctx.fillRect(this.x, this.y, this.width, this.height)
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+ if (selected){
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+ ctx.rect(this.x, this.y, this.width, this.height)
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+ ctx.strokeStyle = '#f0f'
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+ ctx.stroke()
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+ }
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+ ctx.fillStyle = this.color
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+ ctx.stroke()
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+ }
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+ in(x, y){
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+ return x >= this.x && x <= this.x + this.width && y >= this.y && y <= this.y + this.height
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+ }
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+}
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+
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+class Ellipse extends Drawable{
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+ #width = 0
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+ #height = 0
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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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+ this.draw()
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+ }
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+ draw(selected){
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+ ctx.beginPath()
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+ ctx.moveTo(this.x, this.y)
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+ ctx.ellipse(this.x + this.rx, this.y + this.ry, this.rx, this.ry, 0, 0, 2 * Math.PI)
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+ ctx.closePath()
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+ if (selected){
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+ ctx.lineWidth = 2
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+ ctx.fill()
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+ }
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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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+ in(x, y) {
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+ let h = this.x + this.rx
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+ let k = this.y + this.ry
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+ return Math.pow((x - h), 2)/Math.pow(this.rx, 2) + Math.pow((y - k), 2)/Math.pow(this.ry, 2) <= 1
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+ }
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+
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+ set width(newWidth){
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+ if (newWidth < 0){
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+ this.#width = -newWidth
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+ this.x += newWidth
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+ }
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+ else
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+ this.#width = newWidth
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+ }
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+ set height(newHeight){
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+ if (newHeight < 0){
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+ this.#height = -newHeight
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+ this.y += newHeight
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+ }
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+ else
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+ this.#height = newHeight
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+ }
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+ get width(){
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+ return this.#width
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+ }
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+ get height(){
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+ return this.#height
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+ }
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+ get rx(){
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+ return this.#width/2
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+ }
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+ get ry(){
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+ return this.#height/2
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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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+undo.onclick = function(){
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+ Drawable.instances.pop()
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+ Drawable.drawAll()
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+}
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+document.getElementById('delete').onclick = () =>{
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+ Drawable.instances = []
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+ Drawable.drawAll()
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+}
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