/*******************************************************************************
 * 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 org.andork.awt.anim.Animation;
import org.andork.jogl.JoglViewSettings;
import org.andork.math3d.Vecmath;

import com.jogamp.opengl.GLAutoDrawable;

public class SinusoidalViewTranslationAnimation implements Animation {

	JoglViewSettings viewSettings;

	GLAutoDrawable drawable;
	final float[] start = new float[3];

	final float[] end = new float[3];
	final float[] v = Vecmath.newMat4f();

	long period;

	long duration;
	long elapsed;

	public SinusoidalViewTranslationAnimation(GLAutoDrawable drawable, JoglViewSettings viewSettings, float[] end,
			long period, long duration) {
		if (period <= 0) {
			throw new IllegalArgumentException("period must be > 0");
		}
		if (duration <= 0) {
			throw new IllegalArgumentException("duration must be > 0");
		}
		this.viewSettings = viewSettings;
		this.drawable = drawable;
		Vecmath.setf(this.end, end);
		this.period = period;
		this.duration = duration;
	}

	@Override
	public long animate(long animTime) {
		viewSettings.getViewXform(v);

		Vecmath.invAffine(v);

		if (elapsed == 0) {
			Vecmath.getColumn3(v, 3, start);
		}

		elapsed = Math.min(duration, elapsed + animTime);

		float f = (float) (0.5 * (1 - Math.cos(Math.PI * elapsed / duration)));
		float rf = 1f - f;

		v[12] = rf * start[0] + f * end[0];
		v[13] = rf * start[1] + f * end[1];
		v[14] = rf * start[2] + f * end[2];

		Vecmath.invAffine(v);

		viewSettings.setViewXform(v);

		drawable.display();

		return elapsed >= duration ? 0 : Math.min(period, duration - elapsed);
	}
}