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@@ -0,0 +1,306 @@
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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) {
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+ e.buttons & 1 &&
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+ 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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+ 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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+ 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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+ let found = Drawable.instances.filter(
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+ (c) => c.in && c.in(e.clientX, e.clientY)
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+ );
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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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+ } else {
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+ selection = [found.pop()];
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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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+ current.width = e.clientX - current.x;
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+ current.height = e.clientY - current.y;
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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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+ ellipse: {
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+ mousedown(e) {
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+ current = new Ellipse(e.clientX, e.clientY, 1, 1, color.value);
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+ },
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+ mousemove(e) {
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+ if (!current) return;
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+ const width = e.clientX - current.x;
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+ const height = e.clientY - current.y;
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+ current.width = width ? width : width * -1;
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+ current.height = height ? height : height * -1;
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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') 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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+
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+Drawable.prototype.distanceTo = function (x, y) {
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+ if (typeof this.x !== 'number' || 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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+
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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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+ 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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+
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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 = '#1f600e';
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+ ctx.stroke();
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+ }
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+ ctx.stroke();
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+ }
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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 (
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+ rotateX >= 0 &&
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+ rotateX <= this.length &&
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+ rotateY <= this.lineWidth / 2 &&
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+ rotateY >= -this.lineWidth / 2
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+ );
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+ }
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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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+
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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 = '#1f600e';
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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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+
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+ in(x, y) {
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+ return (
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+ x >= this.x &&
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+ x <= this.x + this.width &&
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+ y >= this.y &&
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+ y <= this.y + this.height
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+ );
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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, width, height, color) {
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+ super();
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+ this.x = x ? x : x * -1;
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+ this.y = y ? y : y * -1;
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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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+
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+ draw() {
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+ this.width = this.width > 0 ? this.width : this.width * -1;
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+ this.height = this.height > 0 ? this.height : this.height * -1;
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+ ctx.beginPath();
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+ ctx.moveTo(this.x, this.y);
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+ ctx.ellipse(
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+ this.x,
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+ this.y,
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+ this.height,
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+ this.width,
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+ Math.PI / 2,
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+ 0,
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+ 2 * Math.PI
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+ );
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+ ctx.closePath();
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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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+ 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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+document.getElementById('delete').onclick = () => {
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+ Drawable.instances = [];
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+ Drawable.drawAll();
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+};
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+
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+document.getElementById('undo').onclick = function () {
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+ Drawable.instances.pop();
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+ Drawable.drawAll();
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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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