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an Open Source BPMN 2.0 Modeler

There is a newer version: 2.2.18

package org.yaoqiang.graph.shape;

import java.awt.Polygon;
import java.awt.Rectangle;
import java.awt.Shape;
import java.util.Map;

import com.mxgraph.canvas.mxGraphics2DCanvas;
import com.mxgraph.shape.mxBasicShape;
import com.mxgraph.util.mxConstants;
import com.mxgraph.util.mxUtils;
import com.mxgraph.view.mxCellState;

/**
 * ConversationNodeShape
 * 
 * @author Shi Yaoqiang([email protected])
 */
public class ConversationNodeShape extends mxBasicShape {

	public Shape createShape(mxGraphics2DCanvas canvas, mxCellState state) {
		Rectangle temp = state.getRectangle();
		int x = temp.x;
		int y = temp.y;
		int w = temp.width;
		int h = temp.height;
		Polygon hexagon = new Polygon();

		hexagon.addPoint(x + (int) (0.25 * w), y);
		hexagon.addPoint(x + (int) (0.75 * w), y);
		hexagon.addPoint(x + w, y + (int) (0.5 * h));
		hexagon.addPoint(x + (int) (0.75 * w), y + h);
		hexagon.addPoint(x + (int) (0.25 * w), y + h);
		hexagon.addPoint(x, y + (int) (0.5 * h));

		return hexagon;
	}

	public void paintShape(mxGraphics2DCanvas canvas, mxCellState state) {
		super.paintShape(canvas, state);
		Map style = state.getStyle();
		String image = mxUtils.getString(style, mxConstants.STYLE_IMAGE, "");

		if (image != null) {
			double scale = canvas.getScale();
			double imgWidth = 16 * scale;
			double imgHeight = 16 * scale;

			Rectangle imageBounds = state.getRectangle();
			imageBounds.setRect(imageBounds.getX() + (imageBounds.getWidth() - imgWidth) / 2, imageBounds.getY() + imageBounds.getHeight() - imgHeight,
					imgWidth, imgHeight);
			canvas.drawImage(imageBounds, canvas.getImageForStyle(style));
		}
	}
}