org.yaoqiang.graph.shape.ConversationLinkShape Maven / Gradle / Ivy

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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.util.ArrayList;
import java.util.List;
import java.util.Map;

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

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

	public void paintShape(mxGraphics2DCanvas canvas, mxCellState state) {
		if (state.getAbsolutePointCount() > 1 && configureGraphics(canvas, state, false)) {
			List pts = new ArrayList(state.getAbsolutePoints());
			Map style = state.getStyle();
			paintPolyline(canvas, pts, style);
		}
	}

	protected void paintPolyline(mxGraphics2DCanvas canvas, List points, Map style) {
		boolean rounded = isRounded(style) && canvas.getScale() > mxConstants.MIN_SCALE_FOR_ROUNDED_LINES;
		canvas.paintPolyline(points.toArray(new mxPoint[points.size()]), rounded);

		double scale = canvas.getScale() * 3;
		List pointsB = new ArrayList();
		mxPoint[] p = points.toArray(new mxPoint[points.size()]);
		double a = p[0].getX() - p[p.length - 1].getX();
		double b = p[0].getY() - p[p.length - 1].getY();
		
		if ((int) p[0].getX() == (int) p[1].getX()) {
			pointsB.add(new mxPoint(p[0].getX() - scale, p[0].getY()));
			if (a * b < 0) {
				pointsB.add(new mxPoint(p[1].getX() - scale, p[1].getY() - scale));
				if (p.length == 3) {
					pointsB.add(new mxPoint(p[2].getX(), p[2].getY() - scale));
				} else {
					pointsB.add(new mxPoint(p[2].getX() - scale, p[2].getY() - scale));
				}
			}
		} else {
			pointsB.add(new mxPoint(p[0].getX(), p[0].getY() + scale));
			if (a * b < 0) {
				pointsB.add(new mxPoint(p[1].getX() + scale, p[1].getY() + scale));
				if (p.length == 3) {
					pointsB.add(new mxPoint(p[2].getX() + scale, p[2].getY()));
				} else {
					pointsB.add(new mxPoint(p[2].getX() + scale, p[2].getY() + scale));
				}
			}
		}
		if (a * b > 0) {
			pointsB.add(new mxPoint(p[1].getX() - scale, p[1].getY() + scale));
			if (p.length == 3) {
				if ((int) p[0].getX() == (int) p[1].getX()) {
					pointsB.add(new mxPoint(p[2].getX(), p[2].getY() + scale));
				} else {
					pointsB.add(new mxPoint(p[2].getX() - scale, p[2].getY()));
				}
			} else {
				pointsB.add(new mxPoint(p[2].getX() - scale, p[2].getY() + scale));
			}
		}
		
		if (p.length != 3 || (int)a == 0 || (int)b == 0) {
			if ((int) p[p.length - 2].getX() == (int) p[p.length - 1].getX()) {
				pointsB.add(new mxPoint(p[p.length - 1].getX() - scale, p[p.length - 1].getY()));
			} else if ((int) p[p.length - 2].getY() == (int) p[p.length - 1].getY()) {
				pointsB.add(new mxPoint(p[p.length - 1].getX(), p[p.length - 1].getY() + scale));
			}			
		}
		canvas.paintPolyline(pointsB.toArray(new mxPoint[pointsB.size()]), rounded);
	}

	public boolean isRounded(Map style) {
		return mxUtils.isTrue(style, mxConstants.STYLE_ROUNDED, false);
	}

}