18720358503 在线客服 人才招聘 返回顶部
企业动态 技术分享 行业动态

h5转微信小程序工具_canvas基础绘制

2021-01-11分享 "> 对不起,没有下一图集了!">
canvas基础绘制-绚丽倒计时的实例       下面小编就为大家带来一篇canvas基础绘制-绚丽倒计时的实例。小编觉得挺不错的,现在就分享给大家,也给大家做个参考。一起跟随小编过来看看吧

效果图:

html:

 !DOCTYPE html 
 html lang="en" 
 head 
 meta charset="UTF-8" 
 title ball /title 
 script src="digit_1.js" /script 
 script src="countdown.js" /script 
 /head 
 body 
 canvas id="canvas" /canvas 
 /body 
 /html 

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;
}

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 balls.length;i++){ balls[i].x+=balls[i].vx; balls[i].y+=balls[i].vy; balls[i].vy+=balls[i].g; //落到画布最底部时反弹起来 if(balls[i].y =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 t = 0; for(var i=0;i balls.length;i++){ if(balls[i].x-RADIUS 0 balls[i].x+RADIUS WINDOW_WIDTH){ t++] = balls[i]; while (balls.length Math.min(t)){ balls.pop(); }
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 balls.length;i++){ cxt.fillStyle = balls[i].color; cxt.beginPath(); cxt.arc(balls[i].x,balls[i].y,RADIUS,0,2*Math.PI,true); cxt.closePath(); cxt.fill(); function renderDigit(x,y,num,cxt) { cxt.fillStyle = "rgb(0,102,153)"; 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) { cxt.beginPath(); cxt.arc(x + j * 2 * (RADIUS + 1) + (RADIUS + 1), y + i * 2 * (RADIUS + 1) + (RADIUS + 1), RADIUS, 0, 2 * Math.PI); cxt.closePath(); cxt.fill(); }

以上这篇canvas基础绘制-绚丽倒计时的实例就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持凡科。


"> 对不起,没有下一图集了!">
在线咨询