Cabal Common Library Doc 2DCollision

Overview

This is the main class for the 2D helpers with its members. Scripts can instantiate a copy, e.g.

	this.myHelper = new Cabal_Common_2DCollision();

Properties

internalVersion

Number. Property to give OXPs a chance to check the required lib min. version easily. This number will be raised with every release.

	var a = this.myHelper.internalVersion; a -> 15

Methods

All methods are ignoring the z-coordinate .-)

boundingBox()

	boundingBox: function( minmax, pos )

Checks if point is inside the bounding box.

Parameters:

minmax

Array. 4 positions in a.x,a.y,b.x,b.y

pos

Vector. Position to be checked.

Returns:

inside

Boolean. True if inside.

pointInPoly()

	pointInPoly: function( nvert, vertx, verty, pos, con )

Checks if a point is inside a polygon.

Parameters:

nvert

Number of vertices in the polygon.

vertx, verty

Arrays containing the x- and y-coordinates of the polygon's vertices.

pos

Vector. x- and y-coordinate of the test point.

con

Boolean. Concave shapes may need to set it.

Returns:

inside

Boolean. True if inside.

pointOnLine()

	pointOnLine: function( pa, pb, pos )

Checks if point is on a specified line with a tolerance of 0.4. This method has a problem with vertical lines. If it needs to be more accurate use .pointOnLineB().

Parameters:

pa

Vector. Starting point of the line.

pb

Vector. End point of the line.

pos

Vector. Position to be checked.

Returns:

online

Boolean. True if on line (within tolerance).

pointOnLineB()

	pointOnLineB: function( p1,p2,p3,tol )

Checks if point is on a specified line. Based on Paul Bourkes explanation ([1]).

Parameters:

p1

Vector. Starting point of the line.

p2

Vector. End point of the line.

p3

Vector. Position to be checked.

tol

Number. Tolerance. Default 0.01.

Returns:

online

Boolean. True if on line (within tolerance).