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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 org.yaoqiang.bpmn.model.elements.data.DataInput;
import org.yaoqiang.bpmn.model.elements.data.DataObject;
import org.yaoqiang.bpmn.model.elements.data.DataOutput;
import org.yaoqiang.bpmn.model.elements.data.ItemAwareElement;
import org.yaoqiang.graph.model.GraphModel;
import org.yaoqiang.util.Constants;

import com.mxgraph.canvas.mxGraphics2DCanvas;
import com.mxgraph.model.mxICell;
import com.mxgraph.shape.mxBasicShape;
import com.mxgraph.view.mxCellState;

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

	public void paintShape(mxGraphics2DCanvas canvas, mxCellState state) {
		super.paintShape(canvas, state);

		ItemAwareElement dataObject = null;
		Object value = ((mxICell)state.getCell()).getValue();
		if (value instanceof String) {
			dataObject = new DataObject((String) value, false);
		} else if (value instanceof ItemAwareElement) {
			dataObject = (ItemAwareElement) value;
		}
		GraphModel model = (GraphModel) state.getView().getGraph().getModel();

		double scale = canvas.getScale();
		double imgWidth = 16 * scale;
		double imgHeight = 16 * scale;

		Rectangle imageBounds = state.getRectangle();
		imageBounds.setRect(imageBounds.getX() + (imageBounds.getWidth() - imgWidth) / 4, imageBounds.getY(), imgWidth, imgHeight);

		String image = null;
		if (dataObject instanceof DataInput) {
			image = Constants.SHAPE_MARKER + "event_link.png";
		} else if (dataObject instanceof DataOutput) {
			image = Constants.SHAPE_MARKER + "event_link_throwing.png";
		}
		canvas.drawImage(imageBounds, image);

		if (model.isCollectionDataObject(state.getCell())) {
			Rectangle markerImageBounds = state.getRectangle();
			markerImageBounds.setRect(markerImageBounds.getX() + (markerImageBounds.getWidth() - imgWidth) / 2,
					markerImageBounds.getY() + markerImageBounds.getHeight() - imgHeight, imgWidth, imgHeight);
			canvas.drawImage(markerImageBounds, Constants.SHAPE_MARKER + "loop_multiple.png");
		}

		Rectangle rec = state.getRectangle();
		int x = rec.x;
		int y = rec.y;
		int w = rec.width;
		int a = rec.width / 3;

		canvas.getGraphics().drawLine(x + w - a, y, x + w - a, y + a);
		canvas.getGraphics().drawLine(x + w - a, y + a, x + w, y + a);

	}

	public Shape createShape(mxGraphics2DCanvas canvas, mxCellState state) {
		Rectangle rec = state.getRectangle();
		int x = rec.x;
		int y = rec.y;
		int w = rec.width;
		int h = rec.height;
		int a = rec.width / 3;

		Polygon dataObject = new Polygon();
		dataObject.addPoint(x, y);
		dataObject.addPoint(x, y + h);
		dataObject.addPoint(x + w, y + h);
		dataObject.addPoint(x + w, y + a);
		dataObject.addPoint(x + w - a, y);

		return dataObject;
	}
}