格式化JGraphX邊緣

Question

我正在使用JGraphX mxCompactTreeLayout，默認情況下，該佈局如下圖（A）所示。我想知道是否有可能通過JGraphX實現（B）顯示的內容。這種要求的原因是，如果來自同一個來源的邊緣很多，則該圖看起來很混亂。

Answer 1

使用EDGESTYLE_ELBOW是個不錯的選擇，但如果你想使用的佈局可以或許適應以下。

CompactTreeLayout創建三個點的邊緣。如果擴展布局，則可以將邊的前2個點編輯爲源頂點邊界的x中點。以下是CompactTreeLayout垂直佈局選項的示例。

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

import javax.swing.JFrame; 

import mxgraph.layout.mxCompactTreeLayout; 
import mxgraph.layout.mxIGraphLayout; 
import mxgraph.model.mxGraphModel; 
import mxgraph.model.mxICell; 
import mxgraph.swing.mxGraphComponent; 
import mxgraph.util.mxConstants; 
import mxgraph.util.mxPoint; 
import mxgraph.util.mxRectangle; 
import mxgraph.view.mxGraph; 

public class FormatEdges extends JFrame 
{ 

    public FormatEdges() { 
      mxGraph graph = new mxGraph(); 
      Object parent = graph.getDefaultParent(); 

      Map<String, Object> edgeStyle = graph.getStylesheet().getDefaultEdgeStyle(); 
      edgeStyle.put(mxConstants.STYLE_ENDARROW, mxConstants.NONE); 

      graph.getModel().beginUpdate(); 
      try 
      { 
       // Create vertexes 
       Object vertex1 = graph.insertVertex(parent, null, "01", 10, 20, 80, 30); 
       Object vertex2 = graph.insertVertex(parent, null, "010", 10, 20, 80, 30); 
       Object vertex3 = graph.insertVertex(parent, null, "011", 10, 20, 80, 30); 
       Object vertex4 = graph.insertVertex(parent, null, "B", 115, 200, 50, 50, "shape=ellipse"); 

       // Connect 
       mxICell edge1 = ((mxICell)(graph.insertEdge(parent, "01", "", vertex1, vertex2))); 
       mxICell edge2 = ((mxICell)(graph.insertEdge(parent, "02", "", vertex1, vertex3))); 

       // Layout 
       mxIGraphLayout layout = new ExtendedCompactTreeLayout(graph); 
       layout.execute(parent); 
      } finally 
      { 
       graph.getModel().endUpdate(); 
      } 

      mxGraphComponent graphComponent = new mxGraphComponent(graph); 
      getContentPane().add(graphComponent); 
    } 

    public static void main(String[] args) 
    { 
     FormatEdges frame = new FormatEdges(); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.setSize(400, 320); 
     frame.setVisible(true); 
    } 

    public class ExtendedCompactTreeLayout extends mxCompactTreeLayout 
    { 

     public ExtendedCompactTreeLayout(mxGraph graph) { 
      super(graph, false); 
      super.prefVertEdgeOff = 0; 
     } 

     @Override 
     public void execute(Object parent) 
     { 
      // Execute the CompactTreeLayout 
      super.execute(parent); 

      // Modify the edges to ensure they exit the source cell at the midpoint 
      if(!horizontal) 
      { 
       // get all the vertexes 
       Object[] vertexes = ((mxGraphModel)graph.getModel()).getChildVertices(graph.getModel(), graph.getDefaultParent()); 
       for(int i=0; i < vertexes.length; i++) 
       { 
        mxICell parentCell = ((mxICell)(vertexes[i])); 
        // For each edge of the vertex 
        for(int j=0; j < parentCell.getEdgeCount(); j++) 
        { 
         mxICell edge = parentCell.getEdgeAt(j); 
         // Only consider edges that are from the cell 
         if(edge.getTerminal(true) != parentCell) 
         { 
          continue; 
         } 
         mxRectangle parentBounds = getVertexBounds(parentCell); 
         List<mxPoint> edgePoints = edge.getGeometry().getPoints(); 

         // Need to check that there is always 3 points to an edge, but this will get you started 
         mxPoint outPort = edgePoints.get(0); 
         mxPoint elbowPoint = edgePoints.get(1); 
         if(outPort.getX() != parentBounds.getCenterX()) 
         { 
          outPort.setX(parentBounds.getCenterX()); 
          elbowPoint.setX(parentBounds.getCenterX()); 
         } 
        } 
       } 
      }    
     } 
    } 
} 

Resulting Layout Image