canvas實現的絢麗的電子時鐘效果

admin發表於2017-02-10

本章節分享一段程式碼例項，它實現了絢麗的電子時鐘效果。

當電子時鐘在走動的時候，會出現離子狀散落效果，程式碼例項如下:

[HTML] 純文字檢視 複製程式碼
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.softwhy.com/" />
<title>螞蟻部落</title>
</head>
<body>
<canvas id="canvas" width="1024" height="500" style="margin:0 auto;border-bottom:1px solid #aaa;"></canvas>
<script>
// 數字矩陣
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 RADIUS = 6;
var MARGIN_TOP = 100;
var MARGIN_LEFT = 50;
var ballColors = ["#9f90cd", "#ddd", "#af672d", "#aaafff", "yellow", "#0912af", "pink", "#346a231", "#a91eed"];
var balls = [];
var curDate;
/** 繪製數字
  * @param  ctx繪圖上下文
  * @param  x座標軸
  * @param  y座標軸
  * @param  num數字
*/
var draw = function (ctx, x, y, num) {
  var points = digit[num];
  for (var i = 0; i < points.length; i++) {
    for (var j = 0; j < points<i>.length; j++) {
      if (points<i>[j] == 1) {
        ctx.beginPath();
        ctx.arc(x + j * (RADIUS * 2 + 1), y + i * (RADIUS * 2 + 1), RADIUS, 0, 2 * Math.PI);
        ctx.fillStyle = "#aaa";
        ctx.fill();
      }
    }
  }
}
var ball = {
  x: 512,
  y: 10,
  g: 2,
  vx: -4,
  vy: 0,
  color: "#a368dc"
};
// 渲染時鐘
var renderClock = function (context) {
  var date = new Date();
  var HOUR = date.getHours();
  var MINUTE = date.getMinutes();
  var SECOND = date.getSeconds();
 
  draw(context, MARGIN_LEFT, MARGIN_TOP, parseInt(HOUR / 10));
  draw(context, MARGIN_LEFT + 1 * 18 * RADIUS, MARGIN_TOP, HOUR % 10);
  draw(context, MARGIN_LEFT + 2 * 18 * RADIUS, MARGIN_TOP, 10);
  draw(context, MARGIN_LEFT + 3 * 18 * RADIUS, MARGIN_TOP, parseInt(MINUTE / 10));
  draw(context, MARGIN_LEFT + 4 * 18 * RADIUS, MARGIN_TOP, MINUTE % 10);
  draw(context, MARGIN_LEFT + 5 * 18 * RADIUS, MARGIN_TOP, 10);
  draw(context, MARGIN_LEFT + 6 * 18 * RADIUS, MARGIN_TOP, parseInt(SECOND / 10));
  draw(context, MARGIN_LEFT + 7 * 18 * RADIUS, MARGIN_TOP, SECOND % 10);
  var nextDate = new Date();
  if (curDate.getSeconds() != nextDate.getSeconds()) {
    curDate = nextDate;
    addBalls(context, MARGIN_LEFT + 7 * 18 * RADIUS, MARGIN_TOP, curDate % 10);
    // 防止效能損耗，移去多餘的球
    var curIndex = 0;
    while (balls.length > 200) {
      balls.splice(curIndex, 1);
      curIndex++;
    }
  }
  console.log(balls.length);
}
// 加小球
var addBalls = function (context, x, y, num) {
  var points = digit[num];
  for (var i = 0; i < points.length; i++) {
    for (var j = 0; j < points<i>.length; j++) {
      if (points<i>[j] == 1) {
        var rad = parseInt(Math.random(0, 1) * 9) + 1;
        var ball = {
          x: x + j * (RADIUS * 2 + 1),
          y: y + i * (RADIUS * 2 + 1),
          color: ballColors[rad],
          vx: Math.pow(-1, j) * rad,
          vy: Math.pow(-1, j + 1) * rad,
          g: rad
        };
        balls.push(ball);
      }
    }
  }
}
// 畫小球
var renderBall = function (context) {
 
  for (var i = 0; i < balls.length; i++) {
    var ball = balls<i>;
    ball.x += ball.vx;
    ball.y += ball.vy;
    ball.vy += ball.g;
    if (ball.y > 500 - RADIUS) {
      ball.y = 500 - RADIUS;
      ball.vy = -ball.vy * 0.5;
    }
    context.beginPath();
    context.arc(ball.x, ball.y, RADIUS, 0, 2 * Math.PI);
    context.closePath();
    context.fillStyle = ball.color;
    context.fill();
  }
}
// 初始化
var init = function () {
  var canvas = document.getElementById("canvas");
  var context = canvas.getContext("2d");
  curDate = new Date();
  window.setInterval(function () {
    context.clearRect(0, 0, canvas.width, canvas.height);
    renderClock(context);
    renderBall(context);
  }, 50);
}
// 載入
window.onload = function () {
  init();
}
</script>
</body>
</html>

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