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sources/apps/impressionist/js/knobdial.js
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/**
* Knob - jQuery Plugin
* Nice, configurable, backward compatible knob UI component
*
* Copyright (c) 2011 - 2013 Anthony Terrien
* Version: 1.0.0 (23/11/2011)
* Requires: jQuery v1.7+
*
* Under MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
*/
$(function() {
$.fn.knob = function( gopt ) {
return this.each(
function() {
var $this = $(this);
if( $this.data('knobed') ) return $this;
$this.data('knobed',true);
var opt = $.extend(
{
'min' : $this.data('min') || 0
,'max' : $this.data('max') || 100
,'cursor' : $this.data('cursor')
,'thickness' : $this.data('thickness') || .3
,'width' : $this.data('width') || 200
,'displayInput' : $this.data('displayinput')==null || $this.data('displayinput')
,'fgColor' : $this.data('fgcolor') || '#87CEEB' //#222222'
,'bgColor' : $this.data('bgcolor') || '#EEEEEE'
,'readOnly' : $this.data('readonly')
,'skin' : $this.data('skin') || 'default'
,'draw' :
/**
* @param int a angle
* @param int v current value
* @param array opt plugin options
* @param context ctx Canvas context 2d
*/
function( a, v, opt, ctx ) {
var sa = 1.5*Math.PI
,ea = sa+a
,r = opt.width/2
,lw = r*opt.thickness;
ctx.clearRect(0, 0, opt.width, opt.width);
ctx.lineWidth = lw;
opt.cursor
&& ( sa = ea-0.3 )
&& ( ea = ea+0.3 );
ctx.beginPath();
ctx.strokeStyle = opt.fgColor;
ctx.arc( r, r, r-lw, sa, ea, false);
ctx.stroke();
switch(opt.skin){
case 'default' :
ctx.beginPath();
ctx.strokeStyle = opt.bgColor;
ctx.arc(
r, r, r-lw ,sa
,(v==opt.min && !opt.cursor)
? sa+0.0001
: ea
, true
);
ctx.stroke();
break;
case 'tron' :
ctx.lineWidth = 2;
ctx.beginPath();
ctx.strokeStyle = opt.fgColor;
ctx.arc( r, r, r-lw+1+lw*2/3, 0, 2*Math.PI, false);
ctx.stroke();
break;
}
}
,'change' :
/**
* @param int v Current value
*/
function(v) {}
,'release' :
/**
* @param int v Current value
* @param jQuery ipt Input
*/
function(v,ipt) {}
}
,gopt
);
var c = $('<canvas width="'+opt.width+'" height="'+opt.width+'"></canvas>')
,wd = $('<div style=width:'+opt.width+'px;display:inline;"></div>')
,k;
$this.wrap( wd ).before( c );
opt.displayInput
&& $this.css(
{
'width' : opt.width/2+'px'
,'position' : 'absolute'
,'margin-top' : (opt.width*4.5/13)+'px'
,'margin-left' : '-'+3*opt.width/4+'px'
,'font-size' : opt.width/4+'px'
,'border' : 'none'
,'background' : 'none'
,'font-family' : 'Arial'
,'font-weight' : 'bold'
,'text-align' : 'center'
,'color' : opt.fgColor
,'padding' : '0px'
,'-webkit-appearance': 'none'
}
)
|| $this.css(
{
'width' : '0px'
, 'visibility' : 'hidden'
}
);
k = new Knob( c, opt );
k.onRelease = function(v) {
opt.release(v,$this);
};
k.val( parseInt($this.val()) || 0 );
k.onChange = function(v) {
$this.val(v);
opt.change(v);
};
// bind change on input
$this.bind(
'change'
,function( e ) {
k.val( $this.val() );
}
);
if( !opt.readOnly ){
c.bind(
"mousedown touchstart"
,function( e ) {
e.preventDefault();
k.startDrag( e );
}
);
}else{
$this.attr('readonly','readonly');
}
}
).parent();
}
Knob = function( c, opt ) {
var v = null
,ctx = c[0].getContext("2d")
,a = Math.PI*0.0001
,PI2 = 2*Math.PI
,mx ,my ,x ,y
,_self = this;
this.onChange = function() {}
this.onRelease = function() {}
this.val = function(_v) {
if(null!=_v){
if( v==_v ) return;
v=_v;
this.onChange(_v);
a = (_v-opt.min)*PI2/(opt.max-opt.min);
opt.draw( a, _v, opt, ctx );
}else{
var b = a = Math.atan2( mx-x, -(my-y-opt.width/2) );
(a<0) && (b=a+PI2);
_v = Math.round( b*(opt.max-opt.min)/PI2 ) + opt.min;
return ( _v>opt.max ) ? opt.max : _v;
}
}
this.capture = function(e) {
switch( e.type ){
case 'mousemove' :
case 'mousedown' :
mx = e.pageX;
my = e.pageY;
break;
case 'touchmove' :
case 'touchstart' :
mx = e.originalEvent.touches[0].pageX;
my = e.originalEvent.touches[0].pageY;
break;
}
this.val( this.val() );
}
this.startDrag = function(e) {
var p = c.position();
x = p.left+(opt.width/2);
y = p.top;
this.capture(e);
$(document).bind(
"mousemove.knob touchmove.knob"
,function(e) {
_self.capture(e);
}
)
.bind(
"mouseup.knob touchend.knob"
,function() {
$(document).unbind('mousemove.knob touchmove.knob mouseup.knob touchend.knob');
_self.onRelease(v);
}
);
}
}
});
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