canvas如何实现七巧板图案和粒子时钟效果？（代码示例）

canvas实现七巧板

<canvas id="canvas" width="800" height="800"></canvas>
    <script>
        var rangram = [
            { p: [{ x: 0, y: 0 }, { x: 800, y: 0 }, { x: 400, y: 400 }], color: "#caff67" },
            { p: [{ x: 0, y: 0 }, { x: 400, y: 400 }, { x: 0, y: 800 }], color: "#67becf" },
            { p: [{ x: 800, y: 0 }, { x: 800, y: 400 }, { x: 600, y: 600 }, { x: 600, y: 200 }], color: "#ef3d61" },
            { p: [{ x: 600, y: 200 }, { x: 600, y: 600 }, { x: 400, y: 400 }], color: "#f9f51a" },
            { p: [{ x: 400, y: 400 }, { x: 600, y: 600 }, { x: 400, y: 800 }, { x: 200, y: 600 }], color: "#a594c0" },
            { p: [{ x: 200, y: 600 }, { x: 400, y: 800 }, { x: 0, y: 800 }], color: "#fa8ecc" },
            { p: [{ x: 800, y: 400 }, { x: 800, y: 800 }, { x: 400, y: 800 }], color: "#f6ca29" },
        ]
        var canvas = document.getElementById('canvas');
        if (canvas.getContext) {
            var context = canvas.getContext("2d");
            for(var i = 0; i < rangram.length; i++){
                draw(rangram[i],context);
            }
        }
        function draw(seat,context){
            context.beginPath();
            var pointArr = seat.p;
            context.moveTo(pointArr[0].x, pointArr[0].y);
            
            for(var i = 1; i < pointArr.length; i++){
                context.lineTo(pointArr[i].x, pointArr[i].y);
            }
            context.closePath();
            context.fillStyle=seat.color;
            context.fill();
            
            context.lineWidth=3;
            context.stroke();
            
            context.shadowColor='#ddd';
            context.shadowBlur=30;
            
        }

canvas实现粒子时钟

<canvas id="canvas"></canvas>
    <script src="./digit.js"></script>
    <script>
        var SCREEN_WIDTH = document.body.clientWidth;  
        var SCREEN_HEIGHT = document.body.clientHeight;
        var currentTime = null;
        var MARGIN_LEFT = Math.round(SCREEN_WIDTH / 10);
        var MARGIN_TOP = Math.round(SCREEN_HEIGHT / 10);
        var RADIUS = Math.round(SCREEN_WIDTH * 4 / 5 / 108) - 1;
        var timerArr = [];
        var balls = [];
        const colors = ["#33B5E5", "#0099CC", "#AA66CC", "#9933CC", "#99CC00", "#669900", "#FFBB33", "#FF8800", "#FF4444", "#CC0000"]

        window.onload = function () {
            var canvas = document.getElementById('canvas');
            var context = canvas.getContext("2d");
            canvas.width = SCREEN_WIDTH;
            canvas.height = SCREEN_HEIGHT;
            if (canvas.getContext) {
                var context = canvas.getContext('2d');
                setInterval(function () {
                    upData();
                    rander(context);
                }, 50);
            }
        }

        function upData() {
            currentTime = new Date();

            var curHours = currentTime.getHours();
            var curMinutes = currentTime.getMinutes();
            var curSeconds = currentTime.getSeconds();

            var HoursOne = parseInt(curHours / 10);
            var HoursTwo = parseInt(curHours % 10);
            var MinutesOne = parseInt(curMinutes / 10);
            var MinutesTwo = parseInt(curMinutes % 10);
            var SecondsOne = parseInt(curSeconds / 10);
            var SecondsTwo = parseInt(curSeconds % 10);

            if (HoursOne != timerArr[0]) {
                addBalls(MARGIN_LEFT + 0, MARGIN_TOP, HoursOne);
            }
            if (HoursTwo != timerArr[1]) {
                addBalls(MARGIN_LEFT + 15 * (RADIUS + 1), MARGIN_TOP, HoursTwo);
            }

            if (MinutesOne != timerArr[2]) {
                addBalls(MARGIN_LEFT + 39 * (RADIUS + 1), MARGIN_TOP, MinutesOne);
            }
            if (MinutesTwo != timerArr[3]) {
                addBalls(MARGIN_LEFT + 54 * (RADIUS + 1), MARGIN_TOP, MinutesTwo);
            }

            if (SecondsOne != timerArr[4]) {
                addBalls(MARGIN_LEFT + 78 * (RADIUS + 1), MARGIN_TOP, SecondsOne);
            }
            if (SecondsTwo != timerArr[5]) {
                addBalls(MARGIN_LEFT + 93 * (RADIUS + 1), MARGIN_TOP, SecondsTwo);
            }
            timerArr = [HoursOne, HoursTwo, MinutesOne, MinutesTwo, SecondsOne, SecondsTwo];
            updataBall();

        }
        function updataBall() {
            for (var i = 0; i < balls.length; i++) {
                balls[i].x = balls[i].x + balls[i].vx;
                balls[i].vy = balls[i].vy + balls[i].g;
                balls[i].y = balls[i].y + balls[i].vy;
                if (balls[i].y + RADIUS > SCREEN_HEIGHT) {
                    balls[i].y = SCREEN_HEIGHT - RADIUS;
                    balls[i].vy = - balls[i].vy * 0.8;
                }

            }
            var t = 0;
            for (var i = 0; i < balls.length; i++) {
                if (balls[i].x + RADIUS > 0 && balls[i].x - RADIUS < SCREEN_WIDTH) {
                    balls[t++] = balls[i];
                }
            }
            while(balls.length > t){
                balls.pop();
            }

        }
        function addBalls(x, y, number) {
            for (var i = 0; i < digit[number].length; i++)
                for (var j = 0; j < digit[number][i].length; j++)
                    if (digit[number][i][j] == 1) {
                        var obj = {
                            x: x + j * 2 * (RADIUS + 1) + (RADIUS + 1),
                            y: y + i * 2 * (RADIUS + 1) + (RADIUS + 1),
                            g: 1.5 + Math.random(),
                            vx: Math.pow(-1, Math.ceil(Math.random() * 100)) * 4,
                            vy: -5,
                            color: colors[Math.floor(Math.random() * colors.length)]
                        }
                        balls.push(obj);
                    }
        }

        function rander(context) {
            context.clearRect(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
            var hours = currentTime.getHours();
            var minutes = currentTime.getMinutes();
            var seconds = currentTime.getSeconds();
            renderDigit(MARGIN_LEFT, MARGIN_TOP, parseInt(hours / 10), context)
            renderDigit(MARGIN_LEFT + 15 * (RADIUS + 1), MARGIN_TOP, parseInt(hours % 10), context)
            renderDigit(MARGIN_LEFT + 30 * (RADIUS + 1), MARGIN_TOP, 10, context)
            renderDigit(MARGIN_LEFT + 39 * (RADIUS + 1), MARGIN_TOP, parseInt(minutes / 10), context);
            renderDigit(MARGIN_LEFT + 54 * (RADIUS + 1), MARGIN_TOP, parseInt(minutes % 10), context);
            renderDigit(MARGIN_LEFT + 69 * (RADIUS + 1), MARGIN_TOP, 10, context);
            renderDigit(MARGIN_LEFT + 78 * (RADIUS + 1), MARGIN_TOP, parseInt(seconds / 10), context);
            renderDigit(MARGIN_LEFT + 93 * (RADIUS + 1), MARGIN_TOP, parseInt(seconds % 10), context);
            randerBall(context);
        }
        function randerBall(context) {
            for (var i = 0; i < balls.length; i++) {
                context.fillStyle = balls[i].color;
                context.beginPath();
                context.arc(balls[i].x, balls[i].y, RADIUS, 0, Math.PI * 2, 0);
                context.closePath();
                context.fill();

            }
        }
        function renderDigit(x, y, number, context) {
            context.fillStyle = 'rgb(0,102,153)';
            for (var i = 0; i < digit[number].length; i++)
                for (var j = 0; j < digit[number][i].length; j++)
                    if (digit[number][i][j] == 1) {
                        context.beginPath();
                        context.arc(x + j * 2 * (RADIUS + 1) + (RADIUS + 1), y + i * 2 * (RADIUS + 1) + (RADIUS + 1), RADIUS, 0, 2 * Math.PI)
                        context.closePath();
                        context.fill()
                    }

        }
    </script>

digit =
    [
        [
            [0,0,1,1,1,0,0],
            [0,1,1,0,1,1,0],
            [1,1,0,0,0,1,1],
            [1,1,0,0,0,1,1],
            [1,1,0,0,0,1,1],
            [1,1,0,0,0,1,1],
            [1,1,0,0,0,1,1],
            [1,1,0,0,0,1,1],
            [0,1,1,0,1,1,0],
            [0,0,1,1,1,0,0]
        ],//0
        [
            [0,0,0,1,1,0,0],
            [0,1,1,1,1,0,0],
            [0,0,0,1,1,0,0],
            [0,0,0,1,1,0,0],
            [0,0,0,1,1,0,0],
            [0,0,0,1,1,0,0],
            [0,0,0,1,1,0,0],
            [0,0,0,1,1,0,0],
            [0,0,0,1,1,0,0],
            [1,1,1,1,1,1,1]
        ],//1
        ......

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