/*******************************************************************************
* 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;
import org.andork.math3d.Vecmath;
public class OrthoProjection implements Projection {
public float zNear;
public float zFar;
public float hSpan;
public float vSpan;
public OrthoProjection(float hSpan, float zNear, float zFar) {
this.hSpan = hSpan;
this.zNear = zNear;
this.zFar = zFar;
}
@Override
public void calculate(JoglDrawContext dc, float[] pOut) {
float width = dc.width();
float height = dc.height();
float left, right, bottom, top;
if (vSpan / hSpan > height / width) {
top = vSpan / 2;
bottom = -top;
right = top * width / height;
left = -right;
} else {
right = hSpan / 2;
left = -right;
top = right * height / width;
bottom = -top;
}
Vecmath.ortho(pOut, left, right, bottom, top, zNear, zFar);
}
}