<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>canvas 倒数计时</title>
</head>
<body>
<canvas id="canvas" style="margin-left:200px; margin-top:120px" height="500" width="700"></canvas>
<script>
var HEIGHT = 500;
var WIDTH = 700;
var r = 4;
var R = 5;
var MARGIN_TOP = 30;
var MARGIN_LEFT = 20;
window.onload = function () {
var canvas = document.getElementById("canvas");
var context = canvas.getContext("2d");
canvas.height = HEIGHT;
canvas.width = WIDTH;
var 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
[
[0, 1, 1, 1, 1, 1, 0],
[1, 1, 0, 0, 0, 1, 1],
[0, 0, 0, 0, 0, 1, 1],
[0, 0, 0, 0, 1, 1, 0],
[0, 0, 0, 1, 1, 0, 0],
[0, 0, 1, 1, 0, 0, 0],
[0, 1, 1, 0, 0, 0, 0],
[1, 1, 0, 0, 0, 0, 0],
[1, 1, 0, 0, 0, 1, 1],
[1, 1, 1, 1, 1, 1, 1]
],//2
[
[1, 1, 1, 1, 1, 1, 1],
[0, 0, 0, 0, 0, 1, 1],
[0, 0, 0, 0, 1, 1, 0],
[0, 0, 0, 1, 1, 0, 0],
[0, 0, 1, 1, 1, 0, 0],
[0, 0, 0, 0, 1, 1, 0],
[0, 0, 0, 0, 0, 1, 1],
[0, 0, 0, 0, 0, 1, 1],
[1, 1, 0, 0, 0, 1, 1],
[0, 1, 1, 1, 1, 1, 0]
],//3
[
[0, 0, 0, 0, 1, 1, 0],
[0, 0, 0, 1, 1, 1, 0],
[0, 0, 1, 1, 1, 1, 0],
[0, 1, 1, 0, 1, 1, 0],
[1, 1, 0, 0, 1, 1, 0],
[1, 1, 1, 1, 1, 1, 1],
[0, 0, 0, 0, 1, 1, 0],
[0, 0, 0, 0, 1, 1, 0],
[0, 0, 0, 0, 1, 1, 0],
[0, 0, 0, 1, 1, 1, 1]
],//4
[
[1, 1, 1, 1, 1, 1, 1],
[1, 1, 0, 0, 0, 0, 0],
[1, 1, 0, 0, 0, 0, 0],
[1, 1, 1, 1, 1, 1, 0],
[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],
[1, 1, 0, 0, 0, 1, 1],
[0, 1, 1, 1, 1, 1, 0]
],//5
[
[0, 0, 0, 0, 1, 1, 0],
[0, 0, 1, 1, 0, 0, 0],
[0, 1, 1, 0, 0, 0, 0],
[1, 1, 0, 0, 0, 0, 0],
[1, 1, 0, 1, 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],
[0, 1, 1, 1, 1, 1, 0]
],//6
[
[1, 1, 1, 1, 1, 1, 1],
[1, 1, 0, 0, 0, 1, 1],
[0, 0, 0, 0, 1, 1, 0],
[0, 0, 0, 0, 1, 1, 0],
[0, 0, 0, 1, 1, 0, 0],
[0, 0, 0, 1, 1, 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]
],//7
[
[0, 1, 1, 1, 1, 1, 0],
[1, 1, 0, 0, 0, 1, 1],
[1, 1, 0, 0, 0, 1, 1],
[1, 1, 0, 0, 0, 1, 1],
[0, 1, 1, 1, 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],
[0, 1, 1, 1, 1, 1, 0]
],//8
[
[0, 1, 1, 1, 1, 1, 0],
[1, 1, 0, 0, 0, 1, 1],
[1, 1, 0, 0, 0, 1, 1],
[1, 1, 0, 0, 0, 1, 1],
[0, 1, 1, 1, 0, 1, 1],
[0, 0, 0, 0, 0, 1, 1],
[0, 0, 0, 0, 0, 1, 1],
[0, 0, 0, 0, 1, 1, 0],
[0, 0, 0, 1, 1, 0, 0],
[0, 1, 1, 0, 0, 0, 0]
],//9
[
[0, 0, 0, 0],
[0, 0, 0, 0],
[0, 1, 1, 0],
[0, 1, 1, 0],
[0, 0, 0, 0],
[0, 0, 0, 0],
[0, 1, 1, 0],
[0, 1, 1, 0],
[0, 0, 0, 0],
[0, 0, 0, 0]
]//:
];
var colors = ["#def", "#FF8DB5", "#79D3FB", "#EE941B", "#4CB849"];
// 倒计时两分钟
var minutes = 2;
var seconds = 0;
var countTimes=2*60; // 所需倒计时的次数
paint(context,minutes,seconds,countTimes);
function paint(context, minutes, seconds,countTimes) {
console.log(minutes,seconds,'---------paint()-----------')
drawNum(Math.floor(minutes / 10), context, r, R, MARGIN_LEFT, MARGIN_TOP);
drawNum(minutes % 10, context, r, R, 110 + MARGIN_LEFT, MARGIN_TOP);
drawColon((digit.length) - 1, context, r, R, 220 + MARGIN_LEFT, MARGIN_TOP); // 画冒号
drawNum(Math.floor(seconds / 10), context, r, R, 330 + MARGIN_LEFT, MARGIN_TOP);
drawNum(seconds % 10, context, r, R, 440 + MARGIN_LEFT, MARGIN_TOP);
function drawNum(number, context, r, R, MARGIN_LEFT, MARGIN_TOP) {
for (var i = 0; i < digit[0].length; i++) {
for (var j = 0; j < digit[0][0].length; j++) {
if (digit[number][i][j] == 1) {
context.beginPath();
context.arc((2 * R * j + r * j) + MARGIN_LEFT, (2 * R * i + r * i) + MARGIN_TOP, r, 0, 2 * Math.PI, false);
//context.fillStyle = "#ade";
var color = Math.ceil(Math.random() * (4 - 0) + 0);
context.fillStyle = colors[color];
context.fill();
context.closePath();
}
}
}
}
function drawColon(number, context, r, R, MARGIN_LEFT, MARGIN_TOP) {
