/**
* Copyright (c) 2008-2012 Ardor Labs, Inc.
*
* This file is part of Ardor3D.
*
* Ardor3D is free software: you can redistribute it and/or modify it
* under the terms of its license which may be found in the accompanying
* LICENSE file or at <http://www.ardor3d.com/LICENSE>.
*/
package com.ardor3d.extension.ui.backdrop;
import com.ardor3d.extension.ui.UIComponent;
import com.ardor3d.extension.ui.util.UIQuad;
import com.ardor3d.math.ColorRGBA;
import com.ardor3d.math.Transform;
import com.ardor3d.math.Vector3;
import com.ardor3d.math.type.ReadOnlyColorRGBA;
import com.ardor3d.renderer.Renderer;
import com.ardor3d.renderer.state.BlendState;
import com.ardor3d.renderer.state.BlendState.DestinationFunction;
import com.ardor3d.renderer.state.BlendState.SourceFunction;
/**
* This backdrop paints a solid rectangle of color behind a UI component.
*/
public class SolidBackdrop extends UIBackdrop {
/** The color to draw */
private final ColorRGBA _color = new ColorRGBA(ColorRGBA.GRAY);
/** The quad used across all solid backdrops to render with. */
private static UIQuad _standin = SolidBackdrop.createStandinQuad();
/**
* Construct this backdrop, using the given color.
*
* @param color
* the color of the backdrop
*/
public SolidBackdrop(final ReadOnlyColorRGBA color) {
setColor(color);
}
/**
* @return the color of this back drop.
*/
public ReadOnlyColorRGBA getColor() {
return _color;
}
/**
* Set the color of this back drop.
*
* @param color
* the color to use
*/
public void setColor(final ReadOnlyColorRGBA color) {
if (color != null) {
_color.set(color);
}
}
@Override
public void draw(final Renderer renderer, final UIComponent comp) {
final float oldA = _color.getAlpha();
if (oldA == 0) {
// no need to draw.
return;
}
_color.setAlpha(oldA * UIComponent.getCurrentOpacity());
SolidBackdrop._standin.setDefaultColor(_color);
final Vector3 v = Vector3.fetchTempInstance();
v.set(comp.getMargin().getLeft() + comp.getBorder().getLeft(), comp.getMargin().getBottom()
+ comp.getBorder().getBottom(), 0);
final Transform t = Transform.fetchTempInstance();
t.set(comp.getWorldTransform());
t.applyForwardVector(v);
t.translate(v);
Vector3.releaseTempInstance(v);
SolidBackdrop._standin.setWorldTransform(t);
Transform.releaseTempInstance(t);
final float width = UIBackdrop.getBackdropWidth(comp);
final float height = UIBackdrop.getBackdropHeight(comp);
SolidBackdrop._standin.resize(width, height);
SolidBackdrop._standin.render(renderer);
_color.setAlpha(oldA);
}
private static UIQuad createStandinQuad() {
final UIQuad quad = new UIQuad("standin", 1, 1);
final BlendState blend = new BlendState();
blend.setBlendEnabled(true);
blend.setSourceFunction(SourceFunction.SourceAlpha);
blend.setDestinationFunction(DestinationFunction.OneMinusSourceAlpha);
quad.setRenderState(blend);
quad.updateWorldRenderStates(false);
return quad;
}
}