toxi.geom
Class Triangle2D

java.lang.Object
  toxi.geom.Triangle2D

All Implemented Interfaces:

Shape2D

public class Triangle2D
extends java.lang.Object
implements Shape2D

Field Summary

Vec2D	a
Vec2D	b
Vec2D	c
Vec2D	centroid

Constructor Summary

Triangle2D()

Triangle2D(ReadonlyVec2D a, ReadonlyVec2D b, ReadonlyVec2D c)

Method Summary

Triangle2D	adjustTriangleSizeBy(float offset)
Triangle2D	adjustTriangleSizeBy(float offAB, float offBC, float offCA)
Vec2D	computeCentroid()
boolean	containsPoint(ReadonlyVec2D p) Checks if point vector is inside the triangle created by the points a, b and c.
Triangle2D	copy()
static Triangle2D	createEquilateralFrom(ReadonlyVec2D a, ReadonlyVec2D b)
Triangle2D	flipVertexOrder()
Vec2D	fromBarycentric(ReadonlyVec3D p)
float	getArea() Computes the area of the shape.
Rect	getBounds()
Circle	getCircumCircle()
float	getCircumference() Computes the shape's circumference.
Vec2D	getClosestPointTo(ReadonlyVec2D p) Finds and returns the closest point on any of the triangle edges to the point given.
boolean	intersectsTriangle(Triangle2D tri)
boolean	isClockwise()
static boolean	isClockwise(Vec2D a, Vec2D b, Vec2D c)
void	set(Vec2D a2, Vec2D b2, Vec2D c2)
Polygon2D	toPolygon2D() Creates a Polygon2D instance of the triangle.
java.lang.String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

a

public Vec2D a

b

public Vec2D b

c

public Vec2D c

centroid

public Vec2D centroid

Constructor Detail

Triangle2D

public Triangle2D()

Triangle2D

public Triangle2D(ReadonlyVec2D a,
                  ReadonlyVec2D b,
                  ReadonlyVec2D c)

Method Detail

createEquilateralFrom

public static Triangle2D createEquilateralFrom(ReadonlyVec2D a,
                                               ReadonlyVec2D b)

isClockwise

public static boolean isClockwise(Vec2D a,
                                  Vec2D b,
                                  Vec2D c)

adjustTriangleSizeBy

public Triangle2D adjustTriangleSizeBy(float offset)

adjustTriangleSizeBy

public Triangle2D adjustTriangleSizeBy(float offAB,
                                       float offBC,
                                       float offCA)

computeCentroid

public Vec2D computeCentroid()

containsPoint

public boolean containsPoint(ReadonlyVec2D p)

Checks if point vector is inside the triangle created by the points a, b and c. These points will create a plane and the point checked will have to be on this plane in the region between a,b,c. Note: The triangle must be defined in clockwise order a,b,c

Specified by:

containsPoint in interface Shape2D

Returns:

true, if point is in triangle.

copy

public Triangle2D copy()

flipVertexOrder

public Triangle2D flipVertexOrder()

fromBarycentric

public Vec2D fromBarycentric(ReadonlyVec3D p)

getArea

public float getArea()

Description copied from interface: Shape2D

Computes the area of the shape.

Specified by:

getArea in interface Shape2D

Returns:

area

getBounds

public Rect getBounds()

getCircumCircle

public Circle getCircumCircle()

getCircumference

public float getCircumference()

Description copied from interface: Shape2D

Computes the shape's circumference.

Specified by:

getCircumference in interface Shape2D

Returns:

circumference

getClosestPointTo

public Vec2D getClosestPointTo(ReadonlyVec2D p)

Finds and returns the closest point on any of the triangle edges to the point given.

Parameters:

p - point to check

Returns:

closest point

intersectsTriangle

public boolean intersectsTriangle(Triangle2D tri)

isClockwise

public boolean isClockwise()

set

public void set(Vec2D a2,
                Vec2D b2,
                Vec2D c2)

toPolygon2D

public Polygon2D toPolygon2D()

Creates a Polygon2D instance of the triangle. The vertices of this polygon are disconnected from the ones defining this triangle.

Returns:

triangle as polygon

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object