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[gef3d-dev] Render3DEditPart
Hi all,

Here is just a convenience class that steals code from SolidCube to delegate a renderer back to the enclosing edit part. (There are some other classes that handle the location bits, etc..)  I'm finding it useful for simplifying custom rendering within GEF as all you have to do is provide the factory for the edit part and then return an implementing (anonymous) class from EditPartFactory.

/**
 * <copyright>
 *
 * Copyright (c) 2009 Metascape, LLC.
 * Copyright (c) 2008 Jens von Pilgrim and others.
 * All rights reserved.   This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 *
 * </copyright>
 *
 */
package org.eclipse.amp.agf3d;

import org.eclipse.draw2d.IFigure;
import org.eclipse.draw3d.Figure3D;
import org.eclipse.draw3d.IFigure3D;
import org.eclipse.draw3d.RenderContext;
import org.eclipse.draw3d.geometry.Position3D;
import org.eclipse.draw3d.geometry.Vector3fImpl;
import org.eclipse.draw3d.graphics3d.Graphics3D;
import org.eclipse.draw3d.graphics3d.Graphics3DDraw;
import org.eclipse.draw3d.shapes.AbstractModelShape;
import org.eclipse.draw3d.util.ColorConverter;
import org.eclipse.gef.editparts.AbstractGraphicalEditPart;
import org.eclipse.swt.graphics.Color;

/**
 * An edit part that allows drawing of arbitrary figures into the current rendering context.
 * 
 * @author Miles Parker
 * @author Kristian Duske
 */
public class RenderEdit3DPart extends AbstractGraphicalEditPart {

    public static final int SCALE = 20;
    private static final float[] DEFAULT_COLOR = new float[] { 0, 0, 0, 1 };
    private final float[] m_color = new float[] { DEFAULT_COLOR[0], DEFAULT_COLOR[1], DEFAULT_COLOR[2],
        DEFAULT_COLOR[3] };

    AbstractModelShape shape;

    boolean update = true;

    /**
     * @return
     * @see org.eclipse.gef.editparts.AbstractGraphicalEditPart#createFigure()
     */
    protected IFigure createFigure() {
        final IFigure3D figure = new Figure3D() {
            public void render(RenderContext renderContext) {
                Position3D fp = getPosition3D();
                shape.setPosition(fp);
                shape.render(renderContext);
            }
        };
        shape = new AbstractModelShape() {
            protected void performRender(RenderContext renderContext) {
                Graphics3D g3d = renderContext.getGraphics3D();
                glSetColor(g3d);
                renderShape(g3d);
            }

            @Override
            protected void setup(RenderContext renderContext) {
                Graphics3D g3d = renderContext.getGraphics3D();
                g3d.glPolygonMode(Graphics3DDraw.GL_FRONT_AND_BACK, Graphics3DDraw.GL_FILL);
            }
        };
        figure.getPosition3D().setSize3D(new Vector3fImpl(SCALE, SCALE, SCALE));
        return figure;
    }

    /**
     * Render shape.
     * 
     * @param g3d the g3d
     */
    protected void renderShape(Graphics3D g3d) {
    }

    /**
     * Sets the color of this cube.
     * 
     * @param i_color the color
     * @param i_alpha the alpha value
     * 
     * @throws NullPointerException if the given color is <code>null</code>
     */
    public void setColor(Color i_color, int i_alpha) {

        if (i_color == null) {
            throw new NullPointerException("i_color must not be null");
        }

        ColorConverter.toFloatArray(i_color, i_alpha, m_color);
    }

    /**
     * Sets the color of the given face.
     * 
     * @param i_color the color as an int value (fomat 0x00BBGGRR)
     * @param i_alpha the alpha value
     */
    public void setColor(int i_color, int i_alpha) {

        ColorConverter.toFloatArray(i_color, i_alpha, m_color);
    }

    /**
     * Gl set color.
     * 
     * @param g3d the g3d
     */
    private void glSetColor(Graphics3D g3d) {

        float r = m_color[0];
        float g = m_color[1];
        float b = m_color[2];
        float a = m_color[3];

        g3d.glColor4f(r, g, b, a);
    }

    /**
     * 
     * @see org.eclipse.gef.editparts.AbstractEditPart#createEditPolicies()
     */
    protected void createEditPolicies() {
    }
}

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