ifsm
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a jQuery State Machine (FSM / HSM) to design and manage javascript web user interfaces, simulators, games...
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JavaScript
/**
*
* https://github.com/sebleedelisle
* https://github.com/sebleedelisle/JSTouchController/blob/master/js/Vector2.js
*
* multi-touch game controller demo. for more information http://sebleedelisle.com/2011/04/multi-touch-game-controller-in-javascripthtml5-for-ipad
*
* Intersel - E.Podvin - added features :
* * truncate
Copyright (c)2010-2011, Seb Lee-Delisle, sebleedelisle.com
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
OF SUCH DAMAGE.
*/
var Vector2 = function (x,y) {
this.x= x || 0;
this.y = y || 0;
};
Vector2.prototype = {
reset: function ( x, y ) {
this.x = x;
this.y = y;
return this;
},
toString : function (decPlaces) {
decPlaces = decPlaces || 3;
var scalar = Math.pow(10,decPlaces);
return "[" + Math.round (this.x * scalar) / scalar + ", " + Math.round (this.y * scalar) / scalar + "]";
},
clone : function () {
return new Vector2(this.x, this.y);
},
copyTo : function (v) {
v.x = this.x;
v.y = this.y;
},
copyFrom : function (v) {
this.x = v.x;
this.y = v.y;
},
magnitude : function () {
return Math.sqrt((this.x*this.x)+(this.y*this.y));
},
magnitudeSquared : function () {
return (this.x*this.x)+(this.y*this.y);
},
normalise : function () {
var m = this.magnitude();
if (m<=0) return this;
this.x = this.x/m;
this.y = this.y/m;
return this;
},
reverse : function () {
this.x = -this.x;
this.y = -this.y;
return this;
},
plusEq : function (v) {
this.x+=v.x;
this.y+=v.y;
return this;
},
plusNew : function (v) {
return new Vector2(this.x+v.x, this.y+v.y);
},
minusEq : function (v) {
this.x-=v.x;
this.y-=v.y;
return this;
},
minusNew : function (v) {
return new Vector2(this.x-v.x, this.y-v.y);
},
multiplyEq : function (scalar) {
this.x*=scalar;
this.y*=scalar;
return this;
},
multiplyNew : function (scalar) {
var returnvec = this.clone();
return returnvec.multiplyEq(scalar);
},
divideEq : function (scalar) {
this.x/=scalar;
this.y/=scalar;
return this;
},
divideNew : function (scalar) {
var returnvec = this.clone();
return returnvec.divideEq(scalar);
},
dot : function (v) {
return (this.x * v.x) + (this.y * v.y) ;
},
angle : function (useRadians) {
return Math.atan2(this.y,this.x) * (useRadians ? 1 : Vector2Const.TO_DEGREES);
},
rotate : function (angle, useRadians) {
var cosRY = Math.cos(angle * (useRadians ? 1 : Vector2Const.TO_RADIANS));
var sinRY = Math.sin(angle * (useRadians ? 1 : Vector2Const.TO_RADIANS));
Vector2Const.temp.copyFrom(this);
this.x= (Vector2Const.temp.x*cosRY)-(Vector2Const.temp.y*sinRY);
this.y= (Vector2Const.temp.x*sinRY)+(Vector2Const.temp.y*cosRY);
return this;
},
equals : function (v) {
return((this.x==v.x)&&(this.y==v.x));
},
truncate : function (max)
{
if (this.magnitude() > max)
{
this.normalise();
this.multiplyEq(max);
}
return this;
},
isCloseTo : function (v, tolerance) {
if(this.equals(v)) return true;
Vector2Const.temp.copyFrom(this);
Vector2Const.temp.minusEq(v);
return(Vector2Const.temp.magnitudeSquared() < tolerance*tolerance);
},
rotateAroundPoint : function (point, angle, useRadians) {
Vector2Const.temp.copyFrom(this);
//trace("rotate around point "+t+" "+point+" " +angle);
Vector2Const.temp.minusEq(point);
//trace("after subtract "+t);
Vector2Const.temp.rotate(angle, useRadians);
//trace("after rotate "+t);
Vector2Const.temp.plusEq(point);
//trace("after add "+t);
this.copyFrom(Vector2Const.temp);
},
isMagLessThan : function (distance) {
return(this.magnitudeSquared()<distance*distance);
},
isMagGreaterThan : function (distance) {
return(this.magnitudeSquared()>distance*distance);
}
// still AS3 to convert :
// public function projectOnto(v:Vector2) : Vector2
// {
// var dp:Number = dot(v);
//
// var f:Number = dp / ( v.x*v.x + v.y*v.y );
//
// return new Vector2( f*v.x , f*v.y);
// }
//
//
// public function convertToNormal():void
// {
// var tempx:Number = x;
// x = -y;
// y = tempx;
//
//
// }
// public function getNormal():Vector2
// {
//
// return new Vector2(-y,x);
//
// }
//
//
//
// public function getClosestPointOnLine ( vectorposition : Point, targetpoint : Point ) : Point
// {
// var m1 : Number = y / x ;
// var m2 : Number = x / -y ;
//
// var b1 : Number = vectorposition.y - ( m1 * vectorposition.x ) ;
// var b2 : Number = targetpoint.y - ( m2 * targetpoint.x ) ;
//
// var cx : Number = ( b2 - b1 ) / ( m1 - m2 ) ;
// var cy : Number = m1 * cx + b1 ;
//
// return new Point ( cx, cy ) ;
// }
//
};
Vector2Const = {
TO_DEGREES : 180 / Math.PI,
TO_RADIANS : Math.PI / 180,
temp : new Vector2()
};