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Add a knob to the widget #195

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Add a knob to the widget #195

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8be26fb
Add an optionnal circle knob
gabrielnau Apr 14, 2014
af09da3
Remove wrong margin calculation
gabrielnau Apr 14, 2014
5fb5da0
Add an example of knob usage
gabrielnau Apr 14, 2014
8212679
Default knob radius to 0.7 (of lineWidth)
gabrielnau Apr 14, 2014
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10 changes: 10 additions & 0 deletions index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -166,6 +166,16 @@ <h1>jQuery Knob</h1>
<input class="knob" data-min="-15000" data-displayPrevious=true data-max="15000" data-step="1000" value="-11000">
</div>
<div style="clear:both"></div>
<div class="demo" >
<p>&#215; knob</p>
<pre>
data-displayknob="true"
data-knobcolor="#5bbce4"
data-knobradius="1.4"
</pre>
<input class="knob" data-displayknob="true" data-knobcolor="#5bbce4" data-knobradius="0.7" value="35">
</div>
<div style="clear:both"></div>
<div style="text-align: center">
<p style="font-size: 20px">&#215; Overloaded 'draw' method</p>
</div>
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21 changes: 19 additions & 2 deletions js/jquery.knob.js
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Original file line number Diff line number Diff line change
Expand Up @@ -104,13 +104,16 @@
height : this.$.data('height') || 200,
displayInput : this.$.data('displayinput') == null || this.$.data('displayinput'),
displayPrevious : this.$.data('displayprevious'),
displayKnob: this.$.data('displayknob') || false,
fgColor : this.$.data('fgcolor') || '#87CEEB',
inputColor: this.$.data('inputcolor'),
font: this.$.data('font') || 'Arial',
fontWeight: this.$.data('font-weight') || 'bold',
inline : false,
step : this.$.data('step') || 1,
rotation: this.$.data('rotation'),
knobColor: this.$.data('knobcolor'),
knobRadius: this.$.data('knobradius') || 0.7,

// Hooks
draw : null, // function () {}
Expand All @@ -134,6 +137,10 @@
this.o.inputColor = this.o.fgColor;
}

if(!this.o.knobColor) {
this.o.knobColor = this.o.fgColor;
}

// routing value
if(this.$.is('fieldset')) {

Expand Down Expand Up @@ -669,7 +676,7 @@
this.xy = this.w2 * this.scale;
this.lineWidth = this.xy * this.o.thickness;
this.lineCap = this.o.lineCap;
this.radius = this.xy - this.lineWidth / 2;
this.radius = this.xy - this.lineWidth / 2 - this.o.knobRadius * this.lineWidth / 2;

this.o.angleOffset
&& (this.o.angleOffset = isNaN(this.o.angleOffset) ? 0 : this.o.angleOffset);
Expand Down Expand Up @@ -697,7 +704,7 @@
,'height' : ((this.w / 3) >> 0) + 'px'
,'position' : 'absolute'
,'vertical-align' : 'middle'
,'margin-top' : ((this.w / 3) >> 0) + 'px'
,'margin-top' : (this.w / 3 >> 0) + 'px'
,'margin-left' : '-' + ((this.w * 3 / 4 + 2) >> 0) + 'px'
,'border' : 0
,'background' : 'none'
Expand Down Expand Up @@ -768,6 +775,16 @@
c.strokeStyle = r ? this.o.fgColor : this.fgColor ;
c.arc(this.xy, this.xy, this.radius, a.s, a.e, a.d);
c.stroke();

if(this.o.displayKnob) {
var dx = Math.sin(a.e - a.s) * this.radius;
var dy = - Math.cos(a.e - a.s) * this.radius;

c.beginPath();
c.arc(this.xy + dx, this.xy + dy, this.o.knobRadius * this.lineWidth, 0, 2 * Math.PI, false);
c.fillStyle = this.o.knobColor;
c.fill();
}
};

this.cancel = function () {
Expand Down