jQuery+css3音量调节旋钮插件

PetitQ 按钮图标 2018-10-27 2.18K 0 0

这是一款实用 jQuery 和 css3 制作的音量调节旋钮插件。该 jQuery 旋钮的 UI 使用 css3 来渲染，旋钮的旋转控制则使用 jquery 来实现。

HTML 代码：

```
<figure class="dial">
```

  <div class="center"><span>0</span></div>

```
  <div class="wrapper">
```
```
    <div class="knob">
```
```
      <div class="handle"></div>
```
```
      <div class="indicator"></div>
```
```
    </div>
```
```
  </div>
```
```
  <canvas class="progress"></canvas>
```
```
</figure>
```

也想出现在这里？联系我们吧

JAVASCRIPT 代码：

```
(function() {
```
```
  var Dial, dial,
```

    __bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; };

```
  Dial = (function() {
```
```
    Dial.prototype.raf = null;
```
```
 
```
```
    Dial.prototype.mdown = false;
```
```
 
```
```
    Dial.prototype.mPos = {
```
```
      x: 0,
```
```
      y: 0
```
```
    };
```
```
    Dial.prototype.elementPosition = {
```
```
      x: 0,
```
```
      y: 0
```
```
    };
```
```
    Dial.prototype.target = 0;
```
```
    Dial.prototype.steps = 60;
```
```
    Dial.prototype.radius = 150;
```
```
    Dial.prototype.maxDiff = 150;
```
```
    Dial.prototype.constraint = 360;
```
```
    Dial.prototype.currentVal = 0;
```
```
    function Dial($context) {
```
```
      var knobOffset;
```
```
      this.$context = $context;
```

      this.onMouseMove = __bind(this.onMouseMove, this);

      this.onMouseUp = __bind(this.onMouseUp, this);

      this.onMouseDown = __bind(this.onMouseDown, this);

      this.$knob = this.$context.find(".knob");

      this.$handle = this.$context.find(".handle");

      this.$progress = this.$context.find(".progress");

      this.$center = this.$context.find(".center");

      this.$textOutput = this.$center.find("span");

      this.ctx = this.$progress.get(0).getContext("2d");

```
      knobOffset = this.$knob.offset();
```
```
      this.elementPosition = {
```
```
        x: knobOffset.left,
```
```
        y: knobOffset.top
```
```
      };
```

      this.centerX = this.$progress.width() / 2;

      this.centerY = this.$progress.height() / 2;

      this.canvasSize = this.$progress.width();

```
      this.addEventListeners();
```
```
      this.draw();
```
```
      return;
```
```
    }
```

    Dial.prototype.addEventListeners = function() {

      this.$context.on("mousedown", this.onMouseDown);

      this.$context.on("mousemove", this.onMouseMove);

      $("body").on("mouseup", this.onMouseUp);

```
    };
```

    Dial.prototype.setDialPosition = function() {

```
      this.$knob.css({
```

        transform: "rotate(" + this.target + "deg)"

```
      });
```
```
      this.$handle.css({
```

        transform: "rotate(-" + this.target + "deg)"

```
      });
```
```
      this.draw();
```
```
    };
```
```
    Dial.prototype.draw = function() {
```
```
      var i, _i, _ref;
```

      this.$progress.get(0).height = this.canvasSize;

      this.$progress.get(0).width = this.canvasSize;

```
      this.ctx.save();
```

      this.ctx.translate(this.centerX, this.centerY);

      this.ctx.rotate((-90 * (Math.PI / 180)) - (Math.PI * 2 / this.steps));

      for (i = _i = 0, _ref = this.steps - 1; _i <= _ref; i = _i += 1) {

```
        this.ctx.beginPath();
```

        this.ctx.rotate(Math.PI * 2 / this.steps);

```
        this.ctx.lineWidth = 2;
```
```
        this.ctx.lineTo(160, 0);
```
```
        this.ctx.lineTo(170, 0);
```

        if (i <= Math.floor(this.currentVal)) {

```
          this.ctx.shadowBlur = 10;
```

          this.ctx.strokeStyle = "#fff";

          this.ctx.shadowColor = "#fff";

          if (i > (this.steps * 0.75) && this.currentVal > (this.steps * 0.75)) {

            this.ctx.strokeStyle = "#ff9306";

            this.ctx.shadowColor = "#ff9306";

```
          }
```

          if (i > (this.steps * 0.88) && this.currentVal > (this.steps * 0.88)) {

            this.ctx.strokeStyle = "#ff0606";

            this.ctx.shadowColor = "#ff0606";

```
          }
```
```
        } else {
```

          this.ctx.strokeStyle = "#444";

```
          this.ctx.shadowBlur = 0;
```

          this.ctx.shadowColor = "#fff";

```
        }
```
```
        this.ctx.stroke();
```
```
      }
```
```
      this.ctx.restore();
```
```
    };
```

    Dial.prototype.setMousePosition = function(event) {

```
      var atan, diff, target;
```
```
      this.mPos = {
```

        x: event.pageX - this.elementPosition.x,

        y: event.pageY - this.elementPosition.y

```
      };
```

      atan = Math.atan2(this.mPos.x - this.radius, this.mPos.y - this.radius);

      target = -atan / (Math.PI / 180) + 180;

      diff = Math.abs(target - this.target);

      if (diff < this.maxDiff && target < this.constraint) {

```
        this.target = target;
```

        this.currentVal = this.map(this.target, 0, 360, 0, this.steps);

```
        this.setDialPosition();
```
```
        this.updateOutput();
```
```
      }
```
```
    };
```

    Dial.prototype.updateOutput = function() {

      this.$textOutput.text(Math.round(this.currentVal));

```
    };
```

    Dial.prototype.onMouseDown = function(event) {

```
      this.mdown = true;
```
```
    };
```

    Dial.prototype.onMouseUp = function(event) {

```
      this.mdown = false;
```
```
    };
```

    Dial.prototype.onMouseMove = function(event) {

```
      if (this.mdown) {
```
```
        this.setMousePosition(event);
```
```
      }
```
```
    };
```

    Dial.prototype.map = function(value, low1, high1, low2, high2) {

      return low2 + (high2 - low2) * (value - low1) / (high1 - low1);

```
    };
```
```
    return Dial;
```
```
  })();
```
```
  this.$dial = $(".dial");
```
```
  dial = new Dial(this.$dial);
```
```
}).call(this);
```

更多详细信息请参看：http://codepen.io/jon-walstedt/pen/qbjEu

jQuery+css3 音量调节旋钮插件

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jQuery+css3音量调节旋钮插件

HTML 代码：

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jQuery+css3 音量调节旋钮插件

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