EleDebugView.java

package org.osm2world.viewer.view.debug;

import static java.lang.Math.*;

import java.awt.Color;

import org.osm2world.core.target.jogl.JOGLTarget;

/**
 * view that shows points with a color depending on their elevation
 */
public class EleDebugView extends DebugView {

	@Override
	public String getDescription() {
		return "shows points with a color depending on their elevation";
	}
	
	@Override
	public boolean canBeUsed() {
		return false;
	}
	
	@Override
	protected void fillTarget(JOGLTarget target) {
		
		//TODO port functionality to new elevation calculation
		
//		/* collect all points */
//
//		List<VectorXYZ> points = new ArrayList<VectorXYZ>();
//
//		for (TerrainPatch patch : terrain.getPatches()) {
//			for (TriangleXYZ t : patch.getTriangulation()) {
//				points.addAll(t.getVertices());
//			}
//		}
//
//		for (MapElement element : map.getMapElements()) {
//			if (element.getElevationProfile() != null) {
//				points.addAll(element.getElevationProfile().getPointsWithEle());
//			}
//		}
//
//		/* determine minimum and maximum elevations */
//
//		double minEle = Double.POSITIVE_INFINITY;
//		double maxEle = Double.NEGATIVE_INFINITY;
//
//		for (VectorXYZ point : points) {
//			minEle = min(minEle, point.y);
//			maxEle = max(maxEle, point.y);
//		}
//
//		/* choose a range for distributing the colors */
//
//		double eleRange = max (maxEle - minEle, 10);
//
//		/* draw the points */
//
//		for (VectorXYZ point : points) {
//
//			double colorGradientValue = (point.y - minEle) / eleRange;
//
//			Color color = interpolateGradientColor((float)colorGradientValue,
//					Color.GREEN, Color.YELLOW, Color.RED);
//
//			drawBoxAround(target, point, color, 0.4f);
//
//		}
		
	}

	/**
	 * chooses a color value from a sequence of linear color gradients
	 */
	private Color interpolateGradientColor(float value, Color... colors) {

		assert colors.length > 1;
		
		int sections = colors.length - 1;
		float sectionLength = 1.0f / sections;
		
		int sectionOfValue = min(max(
				(int)( value / sectionLength ), 0), sections-1);
				
		return interpolateGradientColor(
				 (value - sectionLength * sectionOfValue) / sectionLength,
				 colors[sectionOfValue], colors[sectionOfValue+1]);
				
	}
	
	/**
	 * chooses a color value from linear color gradient
	 */
	private Color interpolateGradientColor(float value, Color c0, Color c1) {
		
		return new Color(
				round(c0.getRed() * (1 - value) + c1.getRed() * value),
				round(c0.getGreen() * (1 - value) + c1.getGreen() * value),
				round(c0.getBlue() * (1 - value) + c1.getBlue() * value));
		
	}

	
}