Light.java :  » Java-3D » virtual-pool-zero » virtualPool » scenegraph » Java Open Source

package virtualPool.scenegraph;

import javax.media.opengl.GL;


public class Light extends Node
{
  public float diffuse[];
  public float ambient[];
  public float specular[];
  public float position[];
  public float attenuation[];

  public boolean is_on;

  protected int id;

  public Light(int id)
  {
    diffuse = new float[]{1.0f, 1.0f, 1.0f, 1.0f};
    ambient = new float[]{1.0f, 1.0f, 1.0f, 1.0f};
    specular = new float[]{1.0f, 1.0f, 1.0f, 1.0f};
    position = new float[]{0.0f, 0.0f, 0.0f, 0.0f};
    attenuation = new float[]{1.0f, 0.0f, 0.0f};

    is_on = true;
    this.id = id;
  }

  public int getId()
  {
    return id;
  }
  
  public void setPosition(float x, float y, float z)
  {
    position[0] = x;
    position[1] = y;
    position[2] = z;
  }

  public void setAttenuation(float r, float g, float b)
  {
    attenuation[0] = r;
    attenuation[1] = g;
    attenuation[2] = b;
  }

  public void setDiffuse(float r, float g, float b)
  {
    diffuse[0] = r;
    diffuse[1] = g;
    diffuse[2] = b;
  }

  public void setAmbient(float r, float g, float b)
  {
    ambient[0] = r;
    ambient[1] = g;
    ambient[2] = b;
  }

  public void setSpecular(float r, float g, float b)
  {
    specular[0] = r;
    specular[1] = g;
    specular[2] = b;
  }

  public void setDirectional(boolean isDirectional)
  {
    position[3] = (isDirectional ? 0.0f : 1.0f);
  }

  @Override
  public void render(GL gl)
  {
    gl.glLightfv(id, GL.GL_DIFFUSE, diffuse, 0);
    gl.glLightfv(id, GL.GL_AMBIENT, ambient, 0);
    gl.glLightfv(id, GL.GL_SPECULAR, specular, 0);
    gl.glLightfv(id, GL.GL_POSITION, position, 0);

    gl.glLightf(id, GL.GL_CONSTANT_ATTENUATION, attenuation[0]);
    gl.glLightf(id, GL.GL_LINEAR_ATTENUATION, attenuation[1]);
    gl.glLightf(id, GL.GL_QUADRATIC_ATTENUATION, attenuation[2]);

    if (is_on)
      gl.glEnable(id);
    else
      gl.glDisable(id);
  }
}