somebody621
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Put me in for collision detection/physics/as3, even though nobody here probably cares about those subjects, cause I come here a lot, just feel too lazy to post. If I see some question that spurs my interest, I'll answer. Not trying to brag, I've done a whole ton of AS3, so I can answer some questions on that too.
I might submit some code soon too... Probably will do the rectangle-rectangle SAT collision detection, and maybe circle-line sweep testing.
Edit: Heck, some code just for the fact it's a new thread. It's a vector class, used mostly for motion.
public class Vector
{
public var x:Number;
public var y:Number;
public function Vector(functionX:Number, functionY:Number):void
{
x = functionX;
y = functionY;
}
//get a copy of the vector
public function getCopy():Vector{
return new Vector(x, y);
}
//get the direction of the vector
public function getDir():Number{
return Math.atan2(y, x);
}
//get the length of the vector
public function getMag():Number{
return Math.sqrt(x * x + y * y);
}
//get the length squared
public function getMagSq():Number{
return x*x+y*y;
}
//add this vector with another
public function add (vector:Vector):void{
x += vector.x;
y += vector.y;
}
//return this vector added to another
public function addNew (vector:Vector):Vector{
return new Vector(vector.x + x, vector.y + y);
}
//subtract another vector from this
public function subtract (vector:Vector):void{
x -= vector.x;
y -= vector.y;
}
//return another vector subtracted from this
public function subtractNew (vector:Vector):Vector{
return new Vector(x - vector.x, y - vector.y);
}
//scale this vector by a number
public function multiply (scalar : Number):void{
x *= scalar;
y *= scalar;
}
//return this vector scaled by a number
public function multiplyNew (scalar : Number):Vector{
return new Vector(x*scalar, y*scalar);
}
//divide this vector by a scalar-effects the scale
public function divide (scalar : Number):void{
if(scalar == 0)
throw new Error("Cannot divide by zero");
x /= scalar;
y /= scalar;
}
//return this vector divided by a scalar
public function divideNew (scalar : Number):Vector{
if(scalar == 0)
throw new Error("Cannot divide by zero");
return new Vector(x/scalar, y/scalar);
}
//return the dotproduct of this vector and another
public function dotProduct(vector : Vector):Number{
return x * vector.x + y * vector.y;
}
//turn this into a unit vector, which is a vector with a length of one
public function normalize():void{
var vLen:Number = getMag();
if(vLen==0)
throw new Error("Vector cannot be normalized; It is a zero length Vector");
x /= vLen;
y /= vLen;
}
//return the unit vector of this
public function unit():Vector{
var vLen:Number = getMag();
if(vLen==0)
throw new Error("Vector cannot be normalized; It is a zero length Vector");
return new Vector(x/vLen, y/vLen);
}
//set the vector
public function setTo(xToSet:Number, yToSet:Number):void{
x = xToSet;
y = yToSet;
}
//multiply by a matrix
public function matrixMultiply(m:Matrix2D):void{
var tmpX:Number=x;
x=m.i1j1*x+m.i2j1*y;
y=m.i2j1*tmpX+m.i2j2*y;
}
//multiply by a matrix and return the vector;
public function matrixMultiplyNew(m:Matrix2D):Vector{
return new Vector(m.i1j1*x+m.i1j2*y, m.i2j1*x+m.i2j2*y);
}
public function getInv():Vector{
return multiplyNew(-1);
}
public function toString():String{
return ("("+x+", "+y+")");
}
}
< Message edited by somebody621 -- 8/9/2007 23:31:59 >
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