package org.jzy3d.plot3d.primitives;

import org.jzy3d.maths.Utils;
import org.jzy3d.plot3d.rendering.compat.GLES2CompatUtils;

import com.jogamp.opengl.GL;
import com.jogamp.opengl.GL2;

/**
 * A {@link Quad} extends a {@link Polygon} in order to provide a specific
 * {@link draw()} method that relies on a dedicated GL2 call (GL_QUADS), and to
 * ensure the number of points is never greater than 4.
 * 
 * @see {@link Polygon}
 * 
 * @author Martin Pernollet
 */
public class Quad extends Polygon {
	/**
	 * Initializes an empty {@link Quad} with face status defaulting to true,
	 * and wireframe status defaulting to false.
	 */
	public Quad() {
		super();
	}
	
    @Override
    protected void begin(GL gl) {
        if (gl.isGL2()) {
            gl.getGL2().glBegin(GL2.GL_QUADS);
        } else {
            GLES2CompatUtils.glBegin(GL2.GL_QUADS);
        }
    }


	/** Add a point to the polygon. */
	@Override
    public void add(Point point) {
		if (points.size() == 4)
			throw new RuntimeException(
					"The Quad allready has 4 points registered");

		super.add(point);
	}

	@Override
    public String toString(int depth) {
		return Utils.blanks(depth) + "(Quad) #points:" + points.size();
	}
}