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html 代码
<!DOCTYPE html>
<html>
<head>
<meta charset=”UTF-8″ />
<title>canvas时钟</title>
<style type=”text/css”>
* {
margin: 0;
padding: 0;
}
</style>
<script>
window.onload = function() {
var WINDOW_WIDTH = document.body.scrollWidth
var WINDOW_HEIGHT = document.body.scrollHeight – 10
var RADIUS = 7 //球半径
var NUMBER_GAP = 10 //数字之间的间隙
var u = 0.65 //碰撞能量损耗系数
var context //Canvas绘制上下文
var balls = [] //存储彩色的小球
const colors = [
‘#33B5E5’,
‘#0099CC’,
‘#AA66CC’,
‘#9933CC’,
‘#99CC00’,
‘#669900’,
‘#FFBB33’,
‘#FF8800’,
‘#FF4444’,
‘#CC0000’,
] //彩色小球的颜色
var currentNums = [] //屏幕显示的8个字符
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],
], //:
]
function drawDatetime(cxt) {
var nums = []
var date = new Date()
var hours = date.getHours()
var num1 = Math.floor(hours / 10)
var num2 = hours % 10
context.fillStyle = colors[date.getSeconds() % 10]
var offsetX = WINDOW_WIDTH / 4,
offsetY = 30
nums.push({
num: num1,
})
nums.push({
num: num2,
})
nums.push({
num: 10,
}) //冒号
var minutes = date.getMinutes()
var num1 = Math.floor(minutes / 10)
var num2 = minutes % 10
nums.push({
num: num1,
})
nums.push({
num: num2,
})
nums.push({
num: 10,
}) //冒号
var seconds = date.getSeconds()
var num1 = Math.floor(seconds / 10)
var num2 = seconds % 10
nums.push({
num: num1,
})
nums.push({
num: num2,
})
for (var x = 0; x < nums.length; x++) {
nums[x].offsetX = offsetX
offsetX = drawSingleNumber(
offsetX,
offsetY,
nums[x].num,
cxt,
)
//两个数字连一块，应该间隔一些距离
if (x < nums.length – 1) {
if (nums[x].num != 10 && nums[x + 1].num != 10) {
offsetX += NUMBER_GAP
}
}
}
//说明这是初始化
if (currentNums.length == 0) {
currentNums = nums
} else {
//进行比较
for (
var index = 0;
index < currentNums.length;
index++
) {
if (currentNums[index].num != nums[index].num) {
//不一样时，添加彩色小球
addBalls(nums[index])
currentNums[index].num = nums[index].num
}
}
}
renderBalls(cxt)
updateBalls()
return date
}
function addBalls(item) {
var num = item.num
var numMatrix = digit[num]
for (var y = 0; y < numMatrix.length; y++) {
for (var x = 0; x < numMatrix[y].length; x++) {
if (numMatrix[y][x] == 1) {
var ball = {
offsetX:
item.offsetX + RADIUS + RADIUS * 2 * x,
offsetY: 30 + RADIUS + RADIUS * 2 * y,
color:
colors[
Math.floor(
Math.random() * colors.length,
)
],
g: 1.5 + Math.random(),
vx:
Math.pow(
-1,
Math.ceil(Math.random() * 10),
) *
4 +
Math.random(),
vy: -5,
}
balls.push(ball)
}
}
}
}
function renderBalls(cxt) {
for (var index = 0; index < balls.length; index++) {
cxt.beginPath()
cxt.fillStyle = balls[index].color
cxt.arc(
balls[index].offsetX,
balls[index].offsetY,
RADIUS,
0,
2 * Math.PI,
)
cxt.fill()
}
}
function updateBalls() {
var i = 0
for (var index = 0; index < balls.length; index++) {
var ball = balls[index]
ball.offsetX += ball.vx
ball.offsetY += ball.vy
ball.vy += ball.g
if (ball.offsetY > WINDOW_HEIGHT – RADIUS) {
ball.offsetY = WINDOW_HEIGHT – RADIUS
ball.vy = -ball.vy * u
}
if (
ball.offsetX > RADIUS &&
ball.offsetX < WINDOW_WIDTH – RADIUS
) {
balls[i] = balls[index]
i++
}
}
//去除出边界的球
for (; i < balls.length; i++) {
balls.pop()
}
}
function drawSingleNumber(offsetX, offsetY, num, cxt) {
var numMatrix = digit[num]
for (var y = 0; y < numMatrix.length; y++) {
for (var x = 0; x < numMatrix[y].length; x++) {
if (numMatrix[y][x] == 1) {
cxt.beginPath()
cxt.arc(
offsetX + RADIUS + RADIUS * 2 * x,
offsetY + RADIUS + RADIUS * 2 * y,
RADIUS,
0,
2 * Math.PI,
)
cxt.fill()
}
}
}
cxt.beginPath()
offsetX += numMatrix[0].length * RADIUS * 2
return offsetX
}
var canvas = document.getElementById(‘canvas’)
canvas.width = WINDOW_WIDTH
canvas.height = WINDOW_HEIGHT
context = canvas.getContext(‘2d’)
//记录当前绘制的时刻
var currentDate = new Date()
setInterval(function() {
//清空整个Canvas，重新绘制内容
context.clearRect(
0,
0,
context.canvas.width,
context.canvas.height,
)
drawDatetime(context)
}, 50)
}
</script>
</head>
<body>
<canvas id=”canvas”></canvas>
</body>
</html>
改一下变成了弹性球
html 代码
<!DOCTYPE html>
<html>
<head>
<meta charset=”UTF-8″ />
<title>canvas时钟</title>
<style type=”text/css”>
* {
margin: 0;
padding: 0;
}
</style>
<script>
window.onload = function() {
var WINDOW_WIDTH = document.body.scrollWidth
var WINDOW_HEIGHT = document.body.scrollHeight – 10
var RADIUS = 7 //球半径
var NUMBER_GAP = 10 //数字之间的间隙
var u = 0.95 //碰撞能量损耗系数
var context //Canvas绘制上下文
var balls = [] //存储彩色的小球
const colors = [
‘#33B5E5’,
‘#0099CC’,
‘#AA66CC’,
‘#9933CC’,
‘#99CC00’,
‘#669900’,
‘#FFBB33’,
‘#FF8800’,
‘#FF4444’,
‘#CC0000’,
] //彩色小球的颜色
var currentNums = [] //屏幕显示的8个字符
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],
], //:
]
function drawDatetime(cxt) {
var nums = []
var date = new Date()
var hours = date.getHours()
var num1 = Math.floor(hours / 10)
var num2 = hours % 10
context.fillStyle = colors[date.getSeconds() % 10]
var offsetX = 100,
offsetY = -200
nums.push({
num: num1,
})
nums.push({
num: num2,
})
nums.push({
num: 10,
}) //冒号
var minutes = date.getMinutes()
var num1 = Math.floor(minutes / 10)
var num2 = minutes % 10
nums.push({
num: num1,
})
nums.push({
num: num2,
})
nums.push({
num: 10,
}) //冒号
var seconds = date.getSeconds()
var num1 = Math.floor(seconds / 10)
var num2 = seconds % 10
nums.push({
num: num1,
})
nums.push({
num: num2,
})
for (var x = 0; x < nums.length; x++) {
nums[x].offsetX = offsetX
offsetX = drawSingleNumber(
offsetX,
offsetY,
nums[x].num,
cxt,
)
//两个数字连一块，应该间隔一些距离
if (x < nums.length – 1) {
if (nums[x].num != 10 && nums[x + 1].num != 10) {
offsetX += NUMBER_GAP
}
}
}
//说明这是初始化
if (currentNums.length == 0) {
currentNums = nums
} else {
//进行比较
for (
var index = 0;
index < currentNums.length;
index++
) {
if (currentNums[index].num != nums[index].num) {
//不一样时，添加彩色小球
addBalls(nums[index])
currentNums[index].num = nums[index].num
}
}
}
renderBalls(cxt)
updateBalls()
return date
}
function addBalls(item) {
var num = item.num
var numMatrix = digit[num]
for (var y = 0; y < numMatrix.length; y++) {
for (var x = 0; x < numMatrix[y].length; x++) {
if (numMatrix[y][x] == 1) {
var ball = {
offsetX:
item.offsetX + RADIUS + RADIUS * 2 * x,
offsetY: -200 + RADIUS + RADIUS * 2 * y,
color:
colors[
Math.floor(
Math.random() * colors.length,
)
],
g: 1.5 + Math.random(),
vx:
Math.pow(
-1,
Math.ceil(Math.random() * 10),
) *
4 +
Math.random(),
vy: -5,
}
balls.push(ball)
}
}
}
}
function renderBalls(cxt) {
for (var index = 0; index < balls.length; index++) {
cxt.beginPath()
cxt.fillStyle = balls[index].color
cxt.arc(
balls[index].offsetX,
balls[index].offsetY,
RADIUS,
0,
2 * Math.PI,
)
cxt.fill()
}
}
function updateBalls() {
var i = 0
for (var index = 0; index < balls.length; index++) {
var ball = balls[index]
ball.offsetX += ball.vx
ball.offsetY += ball.vy
ball.vy += ball.g
if (ball.offsetY > WINDOW_HEIGHT – RADIUS) {
ball.offsetY = WINDOW_HEIGHT – RADIUS
ball.vy = -ball.vy * u
}
if (
ball.offsetX > RADIUS &&
ball.offsetX < WINDOW_WIDTH – RADIUS
) {
balls[i] = balls[index]
i++
}
}
//去除出边界的球
for (; i < balls.length; i++) {
balls.pop()
}
}
function drawSingleNumber(offsetX, offsetY, num, cxt) {
var numMatrix = digit[num]
for (var y = 0; y < numMatrix.length; y++) {
for (var x = 0; x < numMatrix[y].length; x++) {
if (numMatrix[y][x] == 1) {
cxt.beginPath()
cxt.arc(
offsetX + RADIUS + RADIUS * 2 * x,
offsetY + RADIUS + RADIUS * 2 * y,
RADIUS,
0,
2 * Math.PI,
)
cxt.fill()
}
}
}
cxt.beginPath()
offsetX += numMatrix[0].length * RADIUS * 2
return offsetX
}
var canvas = document.getElementById(‘canvas’)
canvas.width = WINDOW_WIDTH
canvas.height = WINDOW_HEIGHT
context = canvas.getContext(‘2d’)
//记录当前绘制的时刻
var currentDate = new Date()
setInterval(function() {
//清空整个Canvas，重新绘制内容
context.clearRect(
0,
0,
context.canvas.width,
context.canvas.height,
)
drawDatetime(context)
}, 50)
}
</script>
</head>
<body>
<canvas id=”canvas”></canvas>
</body>
</html>
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