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// 创建一个连线的实例
        PolylineConnection conn = new PolylineConnection();
        conn.setConnectionRouter(new ManhattanConnectionRouter());
        conn.setLineStyle(SWT.LINE_SOLID);
        conn.setForegroundColor(ColorConstants.yellow);  //设置线的颜色  
//        conn.setLineStyle(SWT.LINE_DOT);//设置虚线 

        // 设置连线起点的锚点
        conn.setSourceAnchor(new ChopboxAnchor(node1));
        // 设置连线目标的锚点
        conn.setTargetAnchor(new ChopboxAnchor(node2));
        // 设置连线目标的装饰器
        conn.setTargetDecoration(new PolygonDecoration());