canvas如何实现七巧板图案和粒子时钟效果？（代码示例）

canvas如何实现七巧板图案和粒子时钟效果？下面本篇文章就来给大家介绍一下。有一定的参考价值，有需要的朋友可以参考一下，希望对大家有所帮助。

canvas实现七巧板

            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;                    }

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canvas实现粒子时钟 

                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  SCREEN_HEIGHT) {                    balls[i].y = SCREEN_HEIGHT - RADIUS;                    balls[i].vy = - balls[i].vy * 0.8;                }            }            var t = 0;            for (var i = 0; i  0 && balls[i].x - RADIUS  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()                    }        }    

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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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