circle_packer/index.html at master · fischeversenker/circle_packer · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }
        body, html {
            overflow: hidden;
        }
    </style>
</head>
<body>
    <canvas id="canvas" width="400" height="400"></canvas>
    <script>
        const canvas = window.canvas;
        canvas.width = window.innerWidth;
        canvas.height = window.innerHeight;
        const padding = 10;

        let gameover = false;

        class CirclePacker {
            constructor(ctx) {
                this.ctx = ctx;
                this.circles = [];
                this.lastPointAdded = null;
                this.gameover = false;
                this.setSpawnInterval();
                this.spawner = -1;
            }
            setSpawnInterval(intv) {
                this.spawnInterval = intv || 21;
            }
            pack() {
                // spawn circles
                this.setupSpawner(this.spawnInterval);

                // tick, tack...
                function update() {
                    if (!this.gameover) {
                        requestAnimationFrame(update.bind(this));
                        packer.tick();
                    }
                }
                requestAnimationFrame(update.bind(this));
            }
            setupSpawner(interval) {
                this.spawner = setInterval(() => {
                    if (!this.gameover) {
                        this.addCircle(new Circle(this.getRandomCoords()));
                    } else {
                        clearInterval(spawner);
                    }
                }, interval);
            }
            addCircle(circle) {
                this.circles.push(circle);
                this.lastPointAdded = Date.now();
            }
            addCircleAt(coords) {
                this.addCircle(new Circle(coords));
            }
            getRandomCoords() {
                let x = Math.random() * this.ctx.canvas.width;
                let y = Math.random() * this.ctx.canvas.height;
                let c = 0; // to count the attempts
                while(!this.areCoordsFree(x, y)) {
                    x = Math.random() * this.ctx.canvas.width;
                    y = Math.random() * this.ctx.canvas.height;
                    c++;
                }
                if (c > 2000) {
                    this.gameover = true;
                    console.info('took more than 2000 tries to find an empty spot for a new circle. Restarting...');
                    this.restart();
                }
                return new Point(x, y);
            }
            areCoordsFree(x, y) {
                let res = true;
                this.circles.forEach(circle => {
                    if (res === true && circle.distance(new Point(x, y)) < circle.radius + padding) {
                        res = false;
                    }
                });
                return res;
            }
            tick() {
                this.ctx.clearRect(0, 0, this.ctx.canvas.width, this.ctx.canvas.height);
                this.circles.forEach(circle => {
                    this.drawCircle(circle);
                    if (circle.growing && this.mayCircleGrow(circle)) {
                        circle.grow();
                    } else {
                        circle.growing = false;
                    }
                });
            }
            mayCircleGrow(circle) {
                let can = true;
                if (circle.origin.x - circle.radius < padding || circle.origin.y - circle.radius < padding ||
                    circle.origin.x + circle.radius > canvas.width - padding || circle.origin.y + circle.radius > canvas.height - padding) {
                    return false;
                }
                this.circles.forEach(other => {
                    if (can === true && circle !== other) {
                        if (circle.distance(other.origin) <= circle.radius + other.radius + 5) {
                            can = false;
                        }
                    }
                });
                return can;
            }
            drawCircle(circle) {
                this.ctx.fillStyle = circle.color;
                this.ctx.beginPath();
                this.ctx.arc(circle.origin.x, circle.origin.y, circle.radius, 0, 2 * Math.PI);
                this.ctx.fill();
            }
            reset() {
                this.circles = [];
                this.gameover = false;
                clearInterval(this.spawner);
            }
            restart() {
                this.reset();
                this.pack();
            }
            clearAt(coords) {
                let circles = this.findCirclesAt(coords);
                if (circles.length > 0) {
                    this.removeCircle(circles[0]);
                }
                return circles.length > 0;
            }
            findCirclesAt(coords) {
                return this.circles.filter(circle => circle.distance(coords) < circle.radius);
            }
            removeCircle(circle) {
                this.circles = this.circles.filter(other => circle !== other);
            }
        }

        class Point {
            constructor(x, y) {
                this.x = x;
                this.y = y;
            }
        }

        class Circle {
            constructor(point, color) {
                this.origin = point;
                this.radius = 1;
                this.color = color || this.getColor();
                this.growing = true;
            }
            getColor() {
                let r = Math.min(Math.floor(255 * (this.origin.x / canvas.width)) + 40, 255);
                let g = Math.max(Math.floor(255 * (this.origin.x / canvas.width)) - 20, 16);
                let b = Math.floor(255 * (this.origin.x / canvas.width));
                return '#' + r.toString(16) + g.toString(16)  + '44';
            }
            grow() {
                this.radius++;
            }
            distance(point) {
                return Math.sqrt(Math.pow(point.x - this.origin.x, 2) + Math.pow(point.y - this.origin.y, 2))
            }
        }


        let packer = new CirclePacker(canvas.getContext('2d'));
        packer.pack();

        let dragging = false;
        let removing = false;
        canvas.addEventListener('mousedown', e => {
            dragging = true;
            let p = new Point(e.clientX, e.clientY);
            if (!packer.clearAt(p)) {
                packer.addCircleAt(p);
            } else {
                removing = true;
            }
        });

        canvas.addEventListener('mousemove', e => {
            if (dragging && removing) {
                let p = new Point(e.clientX, e.clientY);
                packer.clearAt(p);
            }
        });
        canvas.addEventListener('mouseup', e => {
            dragging = false;
            removing = false;
        });
        console.info('click in whitespace to place a new bubble\nclick (and drag) a bubble to remove bubbles');
        console.info('use reset(interval) to specify the time (in ms) before a new bubble appears (default is 21).\nusing reset() clears the entire canvas!');
        window.reset = function(interval) {
            packer.setSpawnInterval(interval);
            packer.restart();
        }

    </script>
</body>
</html>