/**
 * 
 */
package analyze;

import java.awt.*;
import java.awt.geom.*;

/**
 * @author John H. Krantz, Ph.D.
 *
 */
public class PlotDOG {
	
	// empty constructor
	public PlotDOG(){}
	
	// the painting routine
	public void plotDOG(Graphics2D g2d,
			Rectangle2D [][] rfArray, double [][] cellResp){

		// determine the maximum and minimum values
		double maxPos = 0;
		double maxNeg = 0;
		for (int y = 0; y < cellResp.length; y ++){
			for (int x = 0; x < cellResp[0].length; x ++){
				if (cellResp[y][x] > maxPos) maxPos = cellResp[y][x];
				if (cellResp[y][x] < maxNeg) maxNeg = cellResp[y][x];
			}
		}
		maxNeg = Math.abs(maxNeg);// convert to absolute value  
		
		double max = maxPos;
		if (maxNeg > max) max = maxNeg;
		// make 15 the smallest range limit
		if (max < 5) max = 5;
		// find the largest range of responses

		// now fill the rectangles
		for (int y = 0; y < cellResp.length; y ++){
			for (int x = 0; x < cellResp[0].length; x ++){
				int lum = 0;  // luminance step
				// determine luminance steps
				lum = (int)(255.0*(Math.abs(cellResp[y][x]))
						/max);
				if (cellResp[y][x] > 0){
					g2d.setPaint(new 
							Color(lum,lum,lum));
				}	
				else {
					g2d.setPaint(new Color(lum,0,lum/3));
				}
				g2d.fill(rfArray[y][x]);
			}// end x axis
		} // end y axis
	}  // end plotDOG
	
}