RangeEffect.java

/*
 * Copyright (c) 2003-onwards Shaven Puppy Ltd
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'Shaven Puppy' nor the names of its contributors
 *   may be used to endorse or promote products derived from this software
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package worm.effects;

import net.puppygames.applet.effects.Effect;
import net.puppygames.applet.widgets.Ring;

import org.lwjgl.util.ReadableColor;

import worm.Layers;
import worm.Res;

import com.shavenpuppy.jglib.opengl.GLRenderable;

import static org.lwjgl.opengl.GL11.*;

/**
 * For showing the range of turrets & capacitors
 */
public class RangeEffect extends Effect {

	private static final int ALPHA_DELTA = 8;
	private static final float THICKNESS = 2.0f;

	private final Ring ring;

	private float radius;
	private float mapX, mapY;
	private int alpha;

	private boolean show = true;
	private boolean finished;
	private boolean done;

	/**
	 * C'tor
	 */
	public RangeEffect(ReadableColor color) {
		ring = new Ring();
		ring.setColor(color);
		ring.setThickness(THICKNESS);
	}

	/**
	 * @param radius the radius to set
	 */
	public void setRadius(float radius) {
		this.radius = radius;
	}

	/**
	 * Show or hide the effect.
	 * @param show the show to set
	 */
	public void setShow(boolean show) {
		this.show = show;
	}

	@Override
	public void finish() {
		finished = true;
		setShow(false);
	}

	@Override
	public boolean isFinished() {
		return finished;
	}

	@Override
	protected void doTick() {
		if (!show) {
			alpha = Math.max(0, alpha - ALPHA_DELTA);
			if (finished && alpha == 0) {
				remove();
				return;
			}
		} else {
			alpha = Math.min(255, alpha + ALPHA_DELTA);
		}
	}

	@Override
	protected void render() {
		if (!isVisible()) {
			return;
		}
		glRender(new GLRenderable() {
			@Override
			public void render() {
				glEnable(GL_BLEND);
				glEnable(GL_TEXTURE_2D);
				glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
				glBlendFunc(GL_ONE, GL_ONE);
				Res.getSolidTexture().bind();
			}
		});

		float x = getOffset().getX() + mapX;
		float y = getOffset().getY() + mapY;

		ring.setAlpha(alpha);
		ring.setLocation(x, y);
		ring.setRadius(radius);
		ring.render(this);

		glRender(new GLRenderable() {
			@Override
			public void render() {
				glDisable(GL_TEXTURE_2D);
			}
		});
	}

	@Override
	public int getDefaultLayer() {
		return Layers.BUILDING_INFO;
	}

	@Override
	protected void doRemove() {
		done = true;
	}

	@Override
	public boolean isEffectActive() {
		return !done;
	}

	/**
	 * Set the location of the effect
	 * @param mapX
	 * @param mapY
	 */
	public void setLocation(float mapX, float mapY) {
		this.mapX = mapX;
		this.mapY = mapY;
	}
}