// SPDX-FileCopyrightText: Chris Pressey, the original author of this work, has dedicated it to the public domain.
// For more information, please refer to <https://unlicense.org/>
// SPDX-License-Identifier: Unlicense

// requires playfield.js
CanvasExperiment2 = function() {
    var p;
    var canvas;
    var ctx;
    var intervalId;
    var w = 40;
    var h = 40;

    var colors = ["red", "black", "green", "blue"];

    this.draw = function() {
        ctx.clearRect(0, 0, canvas.width, canvas.height);

        var c = colors[Math.floor(Math.random() * colors.length)];
        var x = Math.floor(Math.random() * 10);
        var y = Math.floor(Math.random() * 10);

        if (Math.random() > 0.25) {
            p.put(x, y, c);
        } else {
            p.put(x, y, undefined);
        }

        p.foreach(function (x, y, value) {
            ctx.beginPath();
            ctx.fillStyle = value;
            ctx.arc(x * w + (w / 2), y * h + (h / 2), w/2, 0, 2 * Math.PI, false);
            ctx.fill();
        });
    }

    this.start = function(c) {
        p = new Playfield();
        canvas = c;
        ctx = canvas.getContext('2d');
        this.draw();
        intervalId = setInterval(this.draw, 25);
    }
}