BeautifulClock/index.html at master · CreateChen/BeautifulClock · GitHub

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<html>
<head>
	<meta charset="utf-8"/>
	<script type="text/javascript" src="digit.js"></script>
</head>
<body>
	<canvas id="canvas"></canvas>
	<style>
		html,body{
			margin:0;padding: 0;
		}
		#canvas{
		}
	</style>
	<script>
		var WINDOW_WIDTH = window.innerWidth;
		var WINDOW_HEIGHT = window.innerHeight;
		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 hoursOffset, minutesOffset, secondsOffset; //分别代表小时、分钟、秒数的X轴偏移距离
		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
		function drawDatetime(cxt){
			var nums = [];

			context.fillStyle="#005eac"
			var date = new Date();
			var offsetX = 0, offsetY = 0;
			var hours = date.getHours();
			var num1 = Math.floor(hours/10);
			var num2 = hours%10;
			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: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>
</body>
</html>