/*******************************************************************************
 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
 * in Industry THTH ry.
 * 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
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.scenegraph.g2d.nodes;

import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;

/**
 * A scene graph node that renders multiple separately transformed instances of
 * a {@link Shape} by optionally filling or stroking it.
 * 
 * If filling is enabled, it will be performed before stroking the shape.
 * 
 * @author Tuukka Lehtonen
 */
public class InstancingShapeNode extends ShapeNode {

    private static final long serialVersionUID = -681327976554446434L;

    AffineTransform[] transforms = {};
    Paint[] paints = {};

    @SyncField({"instances", "paints"})
    public void setInstances(AffineTransform[] transforms, Paint[] paints) {
        if (transforms.length != paints.length)
            throw new IllegalArgumentException("transforms.length (" + transforms.length + ") != paints.length (" + paints.length + ")");

        this.transforms = transforms;
        this.paints = paints;
    }

    @Override
    public void render(Graphics2D g2d) {
        if (shape == null)
            return;
        if (transforms == null || transforms.length == 0)
            return;

        setupRender(g2d);

        AffineTransform startTr = g2d.getTransform();
        Paint startPaint = g2d.getPaint();

        for (int i = 0; i < transforms.length; ++i) {
            if (transforms[i] != null)
                g2d.transform(transforms[i]);

            if (paints[i] != null)
                g2d.setPaint(paints[i]);
            else
                g2d.setPaint(startPaint);

            renderShape(g2d, shape);

            g2d.setTransform(startTr);
        }
    }

    @Override
    public Rectangle2D getBoundsInLocal() {
        if (shape == null)
            return null;
        if (transforms == null || transforms.length == 0)
            return null;

        Rectangle2D result = null;
        Rectangle2D sb = shape.getBounds2D();
        for (AffineTransform at : transforms) {
            Rectangle2D instanceBounds = at.createTransformedShape(sb).getBounds2D();
            if (result == null)
                result = instanceBounds;
            else
                Rectangle2D.union(result, instanceBounds, result);
        }

        return result;
    }

}