CameraCladogram.java

package org.iplantc.phyloviewer.shared.render;

import org.iplantc.phyloviewer.shared.math.Box2D;
import org.iplantc.phyloviewer.shared.math.Matrix33;

public class CameraCladogram extends Camera
{
	static final double zoomAboutX = 0.8;

	public CameraCladogram()
	{
		this.setPannable(false, true);
	}
	
	@Override
	public Camera create()
	{
		return new CameraCladogram();
	}

	public void panX(double dx)
	{
		Matrix33 T0 = Matrix33.makeTranslate(zoomAboutX, 0.0);
		Matrix33 S = Matrix33.makeScale(Math.max(1 + dx, 0.01), 1.0);
		Matrix33 T1 = Matrix33.makeTranslate(-zoomAboutX, 0.0);

		Matrix33 delta = T0.multiply(S.multiply(T1));
		Matrix33 matrix = delta.multiply(this.getViewMatrix());
		this.setViewMatrix(matrix);
	}

	@Override
	public void zoom(double factor)
	{
		zoom(0.0, 0.5, 1.0, factor);
	}

	@Override
	public void zoomToBoundingBox(Box2D boundingBox)
	{
		if(boundingBox != null && boundingBox.valid())
		{
			double yPosition = 0.5 - boundingBox.getCenter().getY();

			double horizontalScale = (1 != boundingBox.getMin().getX() ? -0.8
					/ (boundingBox.getMin().getX() - 0.8) : 0.8);

			double boundingBoxHeight = boundingBox.getMax().getY() - boundingBox.getMin().getY();

			if(boundingBoxHeight > 0)
			{
				double verticalScale = 1.0 / boundingBoxHeight;

				Matrix33 T0 = Matrix33.makeTranslate(0.8, 0.5);
				Matrix33 SY = Matrix33.makeScale(1, verticalScale);
				Matrix33 TY = Matrix33.makeTranslate(0.0, yPosition);
				Matrix33 SX = Matrix33.makeScale(horizontalScale, 1);
				Matrix33 T1 = Matrix33.makeTranslate(-0.8, -0.5);

				Matrix33 matrix = T0.multiply(SY.multiply(TY.multiply(SX.multiply(T1))));
				this.setViewMatrix(matrix);
			}
		}
	}
}