Java VisualizationViewer.getCenter方法代碼示例

import edu.uci.ics.jung.visualization.VisualizationViewer; //導入方法依賴的package包/類
/**
   * check the modifiers. If accepted, use the mouse drag motion
   * to rotate the graph
*/
  public void mouseDragged(MouseEvent e) {
      if(down == null) return;
      VisualizationViewer vv = (VisualizationViewer)e.getSource();
      boolean accepted = checkModifiers(e);
      if(accepted) {
          MutableTransformer modelTransformer =
              vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.LAYOUT);
          // rotate
          vv.setCursor(cursor);
          
          Point2D center = vv.getCenter();
          Point2D q = down;
          Point2D p = e.getPoint();
          Point2D v1 = new Point2D.Double(center.getX()-p.getX(), center.getY()-p.getY());
          Point2D v2 = new Point2D.Double(center.getX()-q.getX(), center.getY()-q.getY());
          double theta = angleBetween(v1, v2);
          modelTransformer.rotate(theta, vv.getRenderContext().getMultiLayerTransformer().inverseTransform(Layer.VIEW, center));
          down.x = e.getX();
          down.y = e.getY();
      
          e.consume();
      }
  }
 

import edu.uci.ics.jung.visualization.VisualizationViewer; //導入方法依賴的package包/類
/**
 * zoom the display in or out, depending on the direction of the
 * mouse wheel motion.
 */
public void mouseWheelMoved(MouseWheelEvent e) {
       boolean accepted = checkModifiers(e);
       if(accepted == true) {
           VisualizationViewer vv = (VisualizationViewer)e.getSource();
           Point2D mouse = e.getPoint();
           Point2D center = vv.getCenter();
           int amount = e.getWheelRotation();
           if(zoomAtMouse) {
               if(amount > 0) {
                   scaler.scale(vv, in, mouse);
               } else if(amount < 0) {
                   scaler.scale(vv, out, mouse);
               }
           } else {
               if(amount > 0) {
                   scaler.scale(vv, in, center);
               } else if(amount < 0) {
                   scaler.scale(vv, out, center);
               }
           }
           e.consume();
           vv.repaint();
       }
}
 

import edu.uci.ics.jung.visualization.VisualizationViewer; //導入方法依賴的package包/類
/**
* 
* 
* 
* 
*/
  public void mouseDragged(MouseEvent e) {
      if(down == null) return;
      VisualizationViewer vv = (VisualizationViewer)e.getSource();
      boolean accepted = checkModifiers(e);
      if(accepted) {
          MutableTransformer modelTransformer = 
          	vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.LAYOUT);
          vv.setCursor(cursor);
          Point2D q = down;
          Point2D p = e.getPoint();
          float dx = (float) (p.getX()-q.getX());
          float dy = (float) (p.getY()-q.getY());

          Dimension d = vv.getSize();
          float shx = 2.f*dx/d.height;
          float shy = 2.f*dy/d.width;
          Point2D center = vv.getCenter();
          if(p.getX() < center.getX()) {
              shy = -shy;
          }
          if(p.getY() < center.getY()) {
              shx = -shx;
          }
          modelTransformer.shear(shx, shy, center);
          down.x = e.getX();
          down.y = e.getY();
      
          e.consume();
      }
  }
 

import edu.uci.ics.jung.visualization.VisualizationViewer; //導入方法依賴的package包/類
/**
 * This method finds the location of the graph relative to the viewer and
 * shifts is so that it appears in the center of JUNG's VisualizationViewer.
 */
public static Point2D centerGraph(VisualizationViewer<Vertex, Edge> vv, BrowsableNetwork network, Layout<Vertex, Edge> layout,
		EditingModalGraphMouse<Vertex, Edge> mouse) {

	MutableTransformer layout2 = vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.LAYOUT);
	double top = Double.MAX_VALUE;
	double bottom = Double.MAX_VALUE;
	double left = Double.MAX_VALUE;
	double right = Double.MAX_VALUE;

	for (Vertex v : network.getVertices()) {
		Point2D p;
		if (layout instanceof AbstractLayout)
			p = ((AbstractLayout<Vertex, Edge>) layout).transform(v);
		else
			p = ((TreeLayout<Vertex, Edge>) layout).transform(v);
		Point2D invP = layout2.transform(p);
		if (top < invP.getY() || top == Double.MAX_VALUE)
			top = invP.getY();
		if (bottom > invP.getY() || bottom == Double.MAX_VALUE)
			bottom = invP.getY();
		if (left > invP.getX() || left == Double.MAX_VALUE)
			left = invP.getX();
		if (right < invP.getX() || right == Double.MAX_VALUE)
			right = invP.getX();
	}
	if (mouse != null) {
		double scale = 0;
		do {
			scale = vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.VIEW).getScale();
			mouse.mouseWheelMoved(new MouseWheelEvent(vv, 0, 0, 0, vv.getWidth() / 2, vv.getHeight() / 2, 1, false, 1, -1, -1));
		} while (scale >= 1);
	}
	vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.VIEW)
			.setScale(1, 1, new Point((int) (vv.getCenter().getX() - (right + left) / 2), (int) (vv.getCenter().getY() - (top + bottom) / 2)));

	double deltaX = vv.getCenter().getX() - (right + left) / 2;
	double deltaY = vv.getCenter().getY() - (top + bottom) / 2;
	if (!Double.isInfinite(deltaX) && !Double.isInfinite(deltaY) && !Double.isNaN(deltaX) && !Double.isNaN(deltaY)) {
		layout2.translate(deltaX, deltaY);
	}

	return vv.getCenter();
}