/*******************************************************************************
 * Breakout Cave Survey Visualizer
 *
 * Copyright (C) 2014 James Edwards
 *
 * jedwards8 at fastmail dot fm
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program 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 for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *******************************************************************************/
package org.andork.jogl.awt.anim;

import java.util.function.Function;

import org.andork.awt.anim.Animation;
import org.andork.jogl.JoglViewSettings;
import org.andork.jogl.Projection;

import com.jogamp.opengl.GLAutoDrawable;

public class ProjXformAnimation implements Animation {
	JoglViewSettings viewSettings;

	GLAutoDrawable drawable;
	long elapsedTime = 0;

	long totalTime;

	boolean display;
	Function<Float, Projection> function;

	/**
	 * @param setup
	 * @param totalTime
	 * @param function
	 *            a function that takes the animation progress from 0 to 1 and
	 *            the inverted view matrix as arguments, and returns the new
	 *            inverted view matrix.
	 */
	public ProjXformAnimation(GLAutoDrawable drawable, JoglViewSettings viewSettings, long totalTime, boolean display,
			Function<Float, Projection> function) {
		this.viewSettings = viewSettings;
		this.drawable = drawable;
		this.totalTime = totalTime;
		this.display = display;
		this.function = function;
	}

	@Override
	public long animate(long animTime) {
		elapsedTime += animTime;

		float f = Math.min(1f, (float) elapsedTime / totalTime);

		viewSettings.setProjection(function.apply(f));
		if (display) {
			drawable.display();
		}

		return Math.min(30, Math.max(0, totalTime - elapsedTime));
	}
}