canvas基础绘制-绚丽倒计时的实例
程序员文章站
2022-04-29 07:51:35
效果图：
html：
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;
}
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<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
var cnt = 0;
for(var i=0;i<balls.length;i++){
if(balls[i].x-radius>0&&balls[i].x+radius<window_width){
balls[cnt++] = balls[i];
}
}
while (balls.length>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<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。