simogl.util
Class Calc

java.lang.Object
  simogl.util.Calc

public class Calc
extends java.lang.Object

This class provides some usefull methods for calculations

Author:

Frank Bruns

Constructor Summary

Calc()

Method Summary

static void	billboardCylindricalBegin(javax.media.opengl.GL gl) Applies the cylindrical billboarding technique by performing some undo calculations on the current modelview matrix.
static void	billboardEnd(javax.media.opengl.GL gl) Finishes the application of the current billboarding technique
static void	billboardSphericalBegin(javax.media.opengl.GL gl) Applies the sphericla billboarding technique by performing some undo calculations on the current modelview matrix.
static double	cos(double value) Returns the cosine value for the specified value
static float[]	removeRotations(javax.media.opengl.GL gl) This method returns a float array with 16 values, that represents the modelview matrix with all rotation operations eliminated.
static float[]	removeTranslations(javax.media.opengl.GL gl) This method returns a float array with 16 values, that represents the modelview matrix with all translate operations eliminated.
static double	sin(double value) Returns the sine value for the specified value
static double	tan(double value) Returns the tangent value for the specified value

Methods inherited from class java.lang.Object

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

Constructor Detail

Calc

public Calc()

Method Detail

sin

public static double sin(double value)

Returns the sine value for the specified value

Parameters:

value - value in degrees, not radians

Returns:

sinus

cos

public static double cos(double value)

Returns the cosine value for the specified value

Parameters:

value - value in degrees, not radians

Returns:

cosine

tan

public static double tan(double value)

Returns the tangent value for the specified value

Parameters:

value - value in degrees, not radians

Returns:

tangent

billboardSphericalBegin

public static void billboardSphericalBegin(javax.media.opengl.GL gl)

Applies the sphericla billboarding technique by performing some undo calculations on the current modelview matrix. The effect of this is that the objects which are drawn between the billboardSphericalBegin()- and billboardEnd()-methods always face the camera. They even face the camera if you look up or down, which is the difference to the spherical billboarding technique.

Parameters:

gl -

billboardCylindricalBegin

public static void billboardCylindricalBegin(javax.media.opengl.GL gl)

Applies the cylindrical billboarding technique by performing some undo calculations on the current modelview matrix. The effect of this is that the objects which are drawn between the billboardCylindricalBegin()- and billboardEnd()-methods always face the camera. But if you look up with the camera you will still get a perspective effect, which is the difference to the spherical billboarding technique.

Parameters:

gl -

billboardEnd

public static void billboardEnd(javax.media.opengl.GL gl)

Finishes the application of the current billboarding technique

removeTranslations

public static float[] removeTranslations(javax.media.opengl.GL gl)

This method returns a float array with 16 values, that represents the modelview matrix with all translate operations eliminated. You can load the matrix with the gl.glLoadMatrixf()-method.

Parameters:

gl -

Returns:

modelview matrix without its translations

removeRotations

public static float[] removeRotations(javax.media.opengl.GL gl)

This method returns a float array with 16 values, that represents the modelview matrix with all rotation operations eliminated. You can load the matrix with the gl.glLoadMatrixf()-method.

Parameters:

gl -

Returns:

modelview matrix without its rotations