edu.umd.cs.jazz.util
Class ZUtil

java.lang.Object
  |
  +--edu.umd.cs.jazz.util.ZUtil

public class ZUtil

extends java.lang.Object

Provide some generic, useful routines

Constructor Summary

ZUtil()

Method Summary

static float	angleBetweenPoints(java.awt.geom.Point2D pt, java.awt.geom.Point2D a, java.awt.geom.Point2D b) Returns the angle in radians between point a and point b from point pt, that is the angle between a-pt-b.
static double	lerp(double t, double a, double b) Linearly interpolates between a and b, based on t.
static float	lerp(float t, float a, float b) Linearly interpolates between a and b, based on t.
static boolean	rectIntersectsPolyline(java.awt.geom.Rectangle2D rect, float[] xp, float[] yp, float penWidth) Determine if the specified rectangle intersects the specified polyline.
static void	transform(java.awt.geom.Rectangle2D rect, java.awt.geom.AffineTransform tf) Apply the specified transform to the specified rectangle, modifying the rect.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ZUtil

public ZUtil()

Method Detail

lerp

public static float lerp(float t,
                         float a,
                         float b)

Linearly interpolates between a and b, based on t. Specifically, it computes lerp(a, b, t) = a + t*(b - a). This produces a result that changes from a (when t = 0) to b (when t = 1).

Parameters:

a - from point

b - to Point

t - variable 'time' parameter

lerp

public static double lerp(double t,
                          double a,
                          double b)

Linearly interpolates between a and b, based on t. Specifically, it computes lerp(a, b, t) = a + t*(b - a). This produces a result that changes from a (when t = 0) to b (when t = 1).

Parameters:

a - from point

b - to Point

t - variable 'time' parameter

transform

public static void transform(java.awt.geom.Rectangle2D rect,
                             java.awt.geom.AffineTransform tf)

Apply the specified transform to the specified rectangle, modifying the rect.

rectIntersectsPolyline

public static boolean rectIntersectsPolyline(java.awt.geom.Rectangle2D rect,
                                             float[] xp,
                                             float[] yp,
                                             float penWidth)

Determine if the specified rectangle intersects the specified polyline.

Parameters:

rect - The rectangle that is being tested for intersection

xp - The array of X-coordinates that determines the polyline

yp - The array of Y-coordinates that determines the polyline

penWidth - The width of the polyline

Returns:

true if the rectangle intersects the polyline.

angleBetweenPoints

public static float angleBetweenPoints(java.awt.geom.Point2D pt,
                                       java.awt.geom.Point2D a,
                                       java.awt.geom.Point2D b)

Returns the angle in radians between point a and point b from point pt, that is the angle between a-pt-b.

Parameters:

pt,a,b - The points that specify the angle

Returns:

the angle