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World Wind is a collection of components that interactively display 3D geographic information within Java applications or applets.
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/*
 * Copyright (C) 2012 United States Government as represented by the Administrator of the
 * National Aeronautics and Space Administration.
 * All Rights Reserved.
 */

package gov.nasa.worldwind.util.tree;

import gov.nasa.worldwind.avlist.AVKey;
import gov.nasa.worldwind.pick.PickSupport;
import gov.nasa.worldwind.render.DrawContext;
import gov.nasa.worldwind.util.*;

import javax.media.opengl.*;
import java.awt.*;

/**
 * Utility methods for drawing tree controls.
 *
 * @author pabercrombie
 * @version $Id: TreeUtil.java 1171 2013-02-11 21:45:02Z dcollins $
 */
public class TreeUtil
{
    /**
     * Draw a rectangle in a unique pick color, and associate the color with a pickable object.
     *
     * @param dc           Draw context.
     * @param pickSupport  Pick support.
     * @param pickedObject Object to associate with pickable rectangle.
     * @param bounds       Bounds of the pickable rectangle.
     */
    public static void drawPickableRect(DrawContext dc, PickSupport pickSupport, Object pickedObject, Rectangle bounds)
    {
        if (dc == null)
        {
            String message = Logging.getMessage("nullValue.DrawingContextIsNull");
            Logging.logger().severe(message);
            throw new IllegalArgumentException(message);
        }

        GL2 gl = dc.getGL().getGL2(); // GL initialization checks for GL2 compatibility.

        Color color = dc.getUniquePickColor();
        int colorCode = color.getRGB();
        pickSupport.addPickableObject(colorCode, pickedObject);
        gl.glColor3ub((byte) color.getRed(), (byte) color.getGreen(), (byte) color.getBlue());

        drawRect(gl, bounds);
    }

    /**
     * Draw a rectangle.
     *
     * @param gl     GL
     * @param bounds Bounds of the rectangle, in GL coordinates.
     */
    public static void drawRect(GL2 gl, Rectangle bounds)
    {
        if (gl == null)
        {
            String message = Logging.getMessage("nullValue.DrawingContextGLIsNull");
            Logging.logger().severe(message);
            throw new IllegalArgumentException(message);
        }

        if (bounds == null)
        {
            String message = Logging.getMessage("nullValue.BoundingBoxIsNull");
            Logging.logger().severe(message);
            throw new IllegalArgumentException(message);
        }

        gl.glRecti(bounds.x, bounds.y, bounds.x + bounds.width, bounds.y + bounds.height);
    }

    public static void drawRectWithGradient(GL2 gl, Rectangle bounds, Color color1, Color color2, double opacity,
        String gradientDirection)
    {
        if (gl == null)
        {
            String message = Logging.getMessage("nullValue.DrawingContextGLIsNull");
            Logging.logger().severe(message);
            throw new IllegalArgumentException(message);
        }

        if (bounds == null)
        {
            String message = Logging.getMessage("nullValue.BoundingBoxIsNull");
            Logging.logger().severe(message);
            throw new IllegalArgumentException(message);
        }

        gl.glBegin(GL2.GL_QUADS);

        if (AVKey.HORIZONTAL.equals(gradientDirection))
        {
            OGLUtil.applyColor(gl, color1, opacity, false);
            gl.glVertex2d(bounds.getMinX(), bounds.getMaxY());
            gl.glVertex2d(bounds.getMinX(), bounds.getMinY());

            OGLUtil.applyColor(gl, color2, opacity, false);
            gl.glVertex2d(bounds.getMaxX(), bounds.getMinY());
            gl.glVertex2d(bounds.getMaxX(), bounds.getMaxY());
        }
        else
        {
            OGLUtil.applyColor(gl, color1, opacity, false);
            gl.glVertex2d(bounds.getMaxX(), bounds.getMaxY());
            gl.glVertex2d(bounds.getMinX(), bounds.getMaxY());

            OGLUtil.applyColor(gl, color2, opacity, false);
            gl.glVertex2d(bounds.getMinX(), bounds.getMinY());
            gl.glVertex2d(bounds.getMaxX(), bounds.getMinY());
        }
        gl.glEnd();
    }
}