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/*
* Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.scenario.effect.light;
import com.sun.scenario.effect.Color4f;
/**
* Represents a light source at a given position in 3D space.
*/
public class PointLight extends Light {
private float x;
private float y;
private float z;
/**
* Constructs a new {@code PointLight} with default position (0,0,0)
* and color ({@code Color4f.WHITE}).
*/
public PointLight() {
this(0f, 0f, 0f, Color4f.WHITE);
}
/**
* Constructs a new {@code PointLight} with the given position and color.
*
* @param x the x coordinate of the light position
* @param y the y coordinate of the light position
* @param z the z coordinate of the light position
* @param color the color of the light
* @throws IllegalArgumentException if {@code color} is null
*/
public PointLight(float x, float y, float z, Color4f color) {
this(Type.POINT, x, y, z, color);
}
/**
* Package-private constructor.
*
* @param type the type of the light (either {@code POINT} or {@code SPOT})
* @param x the x coordinate of the light position
* @param y the y coordinate of the light position
* @param z the z coordinate of the light position
* @param color the color of the light
* @throws IllegalArgumentException if {@code color} is null
*/
PointLight(Type type, float x, float y, float z, Color4f color) {
super(type, color);
this.x = x;
this.y = y;
this.z = z;
}
/**
* Returns the x coordinate of the light position.
*
* @return the x coordinate of the light position
*/
public float getX() {
return x;
}
/**
* Sets the x coordinate of the light position.
*
*
* @param x the x coordinate of the light position
*/
public void setX(float x) {
this.x = x;
}
/**
* Returns the y coordinate of the light position.
*
* @return the y coordinate of the light position
*/
public float getY() {
return y;
}
/**
* Sets the y coordinate of the light position.
*
*
* @param y the y coordinate of the light position
*/
public void setY(float y) {
this.y = y;
}
/**
* Returns the z coordinate of the light position.
*
* @return the z coordinate of the light position
*/
public float getZ() {
return z;
}
/**
* Sets the z coordinate of the light position.
*
*
* @param z the z coordinate of the light position
*/
public void setZ(float z) {
this.z = z;
}
@Override
public float[] getNormalizedLightPosition() {
// normalize
float len = (float)Math.sqrt(x*x + y*y + z*z);
if (len == 0f) len = 1f;
float[] pos = new float[] {x/len, y/len, z/len};
return pos;
}
}
