canvas如何绘制绚丽倒计时-创新互联
这篇文章给大家分享的是有关canvas如何绘制绚丽倒计时的内容。小编觉得挺实用的,因此分享给大家做个参考,一起跟随小编过来看看吧。
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html:
ball
digit_1.js在之前的 canvas基础绘制-倒计时 中有贴
countdown.js:
var WINDOW_WIDTH = 1024; var WINDOW_HEIGHT = 768; var RADIUS = 8; var MARGIN_TOP = 60; var MARGIN_LEFT = 30; var endTime = new Date();//const声明变量,不可修改,必须声明时赋值; endTime.setTime( endTime.getTime() + 3600*1000);//当前时间向后一小时; var curShowTimeSeconds = 0; var balls =[]; const colors = ["#33B5E5","#0099CC","#AA66CC","#9933CC","#99CC00","#669900","#FFBB33","#FF8800","#FF4444","#CC0000"]; window.onload = function () { //屏幕自适应 WINDOW_WIDTH = document.body.clientWidth; WINDOW_HEIGHT = document.body.clientHeight; RADIUS = Math.round(WINDOW_WIDTH*4/5/108)-1; MARGIN_TOP = Math.round(WINDOW_HEIGHT/5); MARGIN_LEFT = Math.round(WINDOW_WIDTH/10); var canvas = document.getElementById("canvas"); var context = canvas.getContext("2d"); canvas.width = WINDOW_WIDTH; canvas.height = WINDOW_HEIGHT; curShowTimeSeconds = getCurrentShowTimeSeconds(); setInterval( function () { update(); render(context); },50) }; function getCurrentShowTimeSeconds() { var curTime = new Date();//获取目前时间; var ret = endTime.getTime()-curTime.getTime(); ret = Math.round(ret/1000);//获取秒数差值; return ret>=0?ret:0; }
function update() { var nextShowTimeSeconds = getCurrentShowTimeSeconds(); var nextHours = parseInt(nextShowTimeSeconds/3600); var nextMinutes = parseInt((nextShowTimeSeconds-nextHours*3600)/60); var nextSeconds = nextShowTimeSeconds%60; var curHours = parseInt(curShowTimeSeconds/3600); var curMinutes = parseInt((curShowTimeSeconds-curHours*3600)/60); var curSeconds = curShowTimeSeconds%60; if(nextSeconds!=curSeconds){ if(parseInt(curHours/10)!=parseInt(nextHours/10)){ addBalls(MARGIN_LEFT+0,MARGIN_TOP,parseInt(curHours/10)); } if(parseInt(curHours%10)!=parseInt(nextHours%10)){ addBalls(MARGIN_LEFT+15*(RADIUS+1),MARGIN_TOP,parseInt(curHours%10)); } if(parseInt(curMinutes/10)!=parseInt(nextMinutes/10)){ addBalls(MARGIN_LEFT+39*(RADIUS+1),MARGIN_TOP,parseInt(curMinutes/10)); } if(parseInt(curMinutes%10)!=parseInt(nextMinutes%10)){ addBalls(MARGIN_LEFT+54*(RADIUS+1),MARGIN_TOP,parseInt(curMinutes%10)); } if(parseInt(curSeconds/10)!=parseInt(nextSeconds/10)){ addBalls(MARGIN_LEFT+78*(RADIUS+1),MARGIN_TOP,parseInt(curSeconds/10)); } if(parseInt(curSeconds%10)!=parseInt(nextSeconds%10)){ addBalls(MARGIN_LEFT+93*(RADIUS+1),MARGIN_TOP,parseInt(curSeconds%10)); } curShowTimeSeconds = nextShowTimeSeconds; } updateBalls(); } function updateBalls() { //循环遍历每一个彩色动画小球 for(var i=0;i=WINDOW_HEIGHT){ balls[i].y = WINDOW_HEIGHT-RADIUS; balls[i].vy = -balls[i].vy*0.75; } } // 如果小球出了画布,就清除小球,性能优化 var cnt = 0; for(var i=0;i 0&&balls[i].x+RADIUS Math.min(300,cnt)){ balls.pop(); } }
function addBalls(x,y,num) { for (var i = 0; i < digit[num].length; i++) {//数组行 for (var j = 0; j < digit[num][i].length; j++) {//数组列 if (digit[num][i][j] == 1) { var aBall = { 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() * 1000)) * 4,//pow(x,y),x 的 y 次幂;ceil()可对一个数进行上舍入; vy: -5, color: colors[Math.floor(Math.random() * colors.length)]//floor()对一个数进行下舍入 }; balls.push(aBall); } } } } function render(cxt) { //每一帧都要对动画进行刷新,不然就会新的旧的叠在一起; cxt.clearRect(0,0,WINDOW_WIDTH,WINDOW_HEIGHT);//对一个矩形空间里的动画进行刷新; //倒计时的时间绘制 var hours = parseInt(curShowTimeSeconds/3600); var minutes = parseInt((curShowTimeSeconds-hours*3600)/60); var seconds = curShowTimeSeconds%60; renderDigit(MARGIN_LEFT,MARGIN_TOP,parseInt(hours/10),cxt); renderDigit(MARGIN_LEFT+15*(RADIUS+1),MARGIN_TOP,parseInt(hours%10),cxt); renderDigit(MARGIN_LEFT+30*(RADIUS+1),MARGIN_TOP,10,cxt); renderDigit(MARGIN_LEFT+39*(RADIUS+1),MARGIN_TOP,parseInt(minutes/10),cxt); renderDigit(MARGIN_LEFT+54*(RADIUS+1),MARGIN_TOP,parseInt(minutes%10),cxt); renderDigit(MARGIN_LEFT+69*(RADIUS+1),MARGIN_TOP,10,cxt); renderDigit(MARGIN_LEFT+78*(RADIUS+1),MARGIN_TOP,parseInt(seconds/10),cxt); renderDigit(MARGIN_LEFT+93*(RADIUS+1),MARGIN_TOP,parseInt(seconds%10),cxt); //彩色动画小球的绘制 for(var i=0;i感谢各位的阅读!关于“canvas如何绘制绚丽倒计时”这篇文章就分享到这里了,希望以上内容可以对大家有一定的帮助,让大家可以学到更多知识,如果觉得文章不错,可以把它分享出去让更多的人看到吧!
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文章标题:canvas如何绘制绚丽倒计时-创新互联
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