Example #1
0
  /**
   * Scales to the given zoom level, 1.0 being 100%, centered on the given point.
   *
   * @param level The level to zoom to.
   * @param center The center point for the scaling operation.
   * @return The new zoom level.
   */
  public float scaleTo(float level, Point2D center) {
    if (this.scrollPane == null) return 1.0f;
    float oldZoom = this.currentZoom;
    this.currentZoom = Math.max(minimumZoom, level);
    //		this.absoluteViewScaler.scale( this, level, center );
    Dimension viewSize;
    if (level < 1.0f) {
      viewSize = this.scrollPane.getSize();
    } else {
      viewSize = this.scrollPane.getViewport().getExtentSize();
    }
    Dimension newSize =
        new Dimension((int) (viewSize.width * currentZoom), (int) (viewSize.height * currentZoom));
    this.setPreferredSize(newSize);
    this.setSize(newSize);
    //		new LayoutScaler( this.getGraphLayout( )).setSize( newSize );
    if (Float.compare(level, 1.0f) <= 0) this.center();

    // translate the new view position so the mouse is in the same place
    // on the scaled view.
    JViewport vp = this.scrollPane.getViewport();
    double centerX = center.getX();
    double centerY = center.getY();
    double viewPortMouseX = centerX - vp.getViewPosition().getX();
    double viewPortMouseY = centerY - vp.getViewPosition().getY();
    centerX *= currentZoom / oldZoom;
    centerY *= currentZoom / oldZoom;
    viewPortMouseX = centerX - viewPortMouseX;
    viewPortMouseY = centerY - viewPortMouseY;
    vp.setViewPosition(new Point((int) viewPortMouseX, (int) viewPortMouseY));

    return this.currentZoom;
  }
Example #2
0
    /**
     * Changes the size of the underlying Layout.
     *
     * @param size The new size for the layout.
     */
    private void setSize(Dimension size) {
      ObservableCachingLayout<V, E> observableLayout = (ObservableCachingLayout) getGraphLayout();
      Layout<V, E> tmpLayout = observableLayout;
      while (!AbstractLayout.class.isAssignableFrom(tmpLayout.getClass()))
        tmpLayout = ((LayoutDecorator<V, E>) tmpLayout).getDelegate();
      AbstractLayout<V, E> layout = (AbstractLayout<V, E>) tmpLayout;

      // the first time the graph is resized, re-initialize the layout to make sure it gets
      // the right size.  Any other time, just scale it. The first resize should be when the
      // graph is made visible and laid out.
      // this is kind of a hack; there may be a better way to handle this.
      // I tried listening for componentShown, but it didn't work properly.
      if (layoutInitialized < 1) {
        layout.getSize().setSize(size);
        layout.initialize();
        layoutInitialized++;
        return;
      }

      // change the size of the layout without triggering the automatic resizing.
      double wScale = size.getWidth() / layout.getSize().getWidth();
      double hScale = size.getHeight() / layout.getSize().getHeight();
      double scale = Math.min(wScale, hScale);
      layout.getSize().setSize(size);
      Collection<V> vertices = new Vector(getVertices());
      synchronized (graph) {
        for (V v : vertices) {
          double x =
              layout.getX(v)
                  * scale; // Math.min( size.getWidth( ) - 10, Math.max( 10, layout.getX( v ) *
                           // scale ));
          double y =
              layout.getY(v)
                  * scale; // Math.min( size.getHeight( ) - 10, Math.max( 10, layout.getY( v ) *
                           // scale ));
          layout.setLocation(v, new Point2D.Double(x, y));
        }
      }
      // alert the ObservableLayout that things have changed.
      observableLayout.fireStateChanged();
    }