mxgraphoutline.java

经典的java图像处理程序源码

			tripleBufferGraphics.dispose();
			tripleBufferGraphics = null;
		}
	}

	/**
	 * Clears and repaints the triple buffer at the given rectangle or repaints
	 * the complete buffer if no rectangle is specified.
	 * 
	 * @param clip
	 */
	public void repaintTripleBuffer(Rectangle clip)
	{
		if (tripleBuffered && tripleBufferGraphics != null)
		{
			if (clip == null)
			{
				clip = new Rectangle(tripleBuffer.getWidth(), tripleBuffer
						.getHeight());
			}

			// Clears and repaints the dirty rectangle using the
			// graphics canvas of the graph component as a renderer
			mxUtils.clearRect(tripleBufferGraphics, clip, null);
			tripleBufferGraphics.setClip(clip);
			paintGraph(tripleBufferGraphics);
			tripleBufferGraphics.setClip(null);

			repaintBuffer = false;
			repaintClip = null;
		}
	}

	/**
	 * 
	 */
	public void updateFinder(boolean repaint)
	{
		Rectangle rect = graphComponent.getViewport().getViewRect();

		int x = (int) Math.round(rect.x * scale);
		int y = (int) Math.round(rect.y * scale);
		int w = (int) Math.round((rect.x + rect.width) * scale) - x;
		int h = (int) Math.round((rect.y + rect.height) * scale) - y;

		updateFinderBounds(new Rectangle(x + translate.x, y + translate.y,
				w + 1, h + 1), repaint);
	}

	/**
	 * 
	 */
	public void updateFinderBounds(Rectangle bounds, boolean repaint)
	{
		if (bounds != null && !bounds.equals(finderBounds))
		{
			Rectangle old = new Rectangle(finderBounds);
			finderBounds = bounds;

			// LATER: Fix repaint region to be smaller
			if (repaint)
			{
				old = old.union(finderBounds);
				old.grow(3, 3);
				repaint(old);
			}
		}
	}

	/**
	 * 
	 */
	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		paintBackground(g);

		if (graphComponent != null)
		{
			// Creates or destroys the triple buffer as needed
			if (tripleBuffered)
			{
				checkTripleBuffer();
			}
			else if (tripleBuffer != null)
			{
				destroyTripleBuffer();
			}

			// Updates the dirty region from the buffered graph image
			if (tripleBuffer != null)
			{
				if (repaintBuffer)
				{
					repaintTripleBuffer(null);
				}
				else if (repaintClip != null)
				{
					repaintClip.grow(1 / scale);

					repaintClip.setX(repaintClip.getX() * scale + translate.x);
					repaintClip.setY(repaintClip.getY() * scale + translate.y);
					repaintClip.setWidth(repaintClip.getWidth() * scale);
					repaintClip.setHeight(repaintClip.getHeight() * scale);

					repaintTripleBuffer(repaintClip.getRectangle());
				}

				mxUtils.drawImageClip(g, tripleBuffer, this);
			}

			// Paints the graph directly onto the graphics
			else
			{
				paintGraph(g);
			}

			paintForeground(g);
		}
	}

	/**
	 * Paints the background.
	 */
	protected void paintBackground(Graphics g)
	{
		if (graphComponent != null)
		{
			Graphics2D g2 = (Graphics2D) g;
			AffineTransform tx = g2.getTransform();

			try
			{
				// Draws the background of the outline if a graph exists 
				g.setColor(graphComponent.getPageBackgroundColor());
				mxUtils.fillClippedRect(g, 0, 0, getWidth(), getHeight());

				g2.translate(translate.x, translate.y);
				g2.scale(scale, scale);

				// Draws the scaled page background
				if (!graphComponent.isPageVisible())
				{
					g.setColor(graphComponent.getBackground());
					Dimension size = graphComponent.getGraphControl().getSize();

					// Paints the background of the drawing surface
					mxUtils.fillClippedRect(g, 0, 0, size.width, size.height);
					g.setColor(g.getColor().darker().darker());
					g.drawRect(0, 0, size.width, size.height);
				}
				else
				{
					// Paints the page background using the graphics scaling
					graphComponent.paintBackgroundPage(g);
				}
			}
			finally
			{
				g2.setTransform(tx);
			}
		}
		else
		{
			// Draws the background of the outline if no graph exists 
			g.setColor(getBackground());
			mxUtils.fillClippedRect(g, 0, 0, getWidth(), getHeight());
		}
	}

	/**
	 * Paints the graph outline.
	 */
	public void paintGraph(Graphics g)
	{
		if (graphComponent != null)
		{
			Graphics2D g2 = (Graphics2D) g;
			AffineTransform tx = g2.getTransform();

			try
			{
				g2.translate(translate.x, translate.y);
				g2.scale(scale, scale);

				// Draws the scaled graph
				graphComponent.paintGraph(g2, drawLabels);
			}
			finally
			{
				g2.setTransform(tx);
			}
		}
	}

	/**
	 * Paints the foreground. Foreground is dynamic and should never be made
	 * part of the triple buffer. It is painted on top of the buffer.
	 */
	protected void paintForeground(Graphics g)
	{
		if (graphComponent != null)
		{
			Graphics2D g2 = (Graphics2D) g;

			Stroke stroke = g2.getStroke();
			g.setColor(Color.BLUE);
			g2.setStroke(new BasicStroke(3));
			g.drawRect(finderBounds.x, finderBounds.y, finderBounds.width,
					finderBounds.height);

			g2.setStroke(stroke);
			g.setColor(DEFAULT_ZOOMHANDLE_FILL);
			g.fillRect(finderBounds.x + finderBounds.width - 6, finderBounds.y
					+ finderBounds.height - 6, 8, 8);
			g.setColor(Color.BLACK);
			g.drawRect(finderBounds.x + finderBounds.width - 6, finderBounds.y
					+ finderBounds.height - 6, 8, 8);
		}
	}

	/**
	 * Returns true if the scale or translate has changed.
	 */
	public boolean updateScaleAndTranslate()
	{
		double newScale = 1;
		int dx = 0;
		int dy = 0;

		if (this.graphComponent != null)
		{
			Dimension graphSize = graphComponent.getGraphControl().getSize();
			Dimension outlineSize = getSize();

			int gw = (int) graphSize.getWidth();
			int gh = (int) graphSize.getHeight();

			if (gw > 0 && gh > 0)
			{
				boolean magnifyPage = graphComponent.isPageVisible()
						&& isFitPage()
						&& graphComponent.getHorizontalScrollBar().isVisible()
						&& graphComponent.getVerticalScrollBar().isVisible();
				double graphScale = graphComponent.getGraph().getView()
						.getScale();
				mxPoint trans = graphComponent.getGraph().getView()
						.getTranslate();

				int w = (int) outlineSize.getWidth() - 2 * outlineBorder;
				int h = (int) outlineSize.getHeight() - 2 * outlineBorder;

				if (magnifyPage)
				{
					gw -= 2 * Math.round(trans.getX() * graphScale);
					gh -= 2 * Math.round(trans.getY() * graphScale);
				}

				newScale = Math.min((double) w / gw, (double) h / gh);

				dx += (int) Math
						.round((outlineSize.getWidth() - gw * newScale) / 2);
				dy += (int) Math
						.round((outlineSize.getHeight() - gh * newScale) / 2);

				if (magnifyPage)
				{
					dx -= Math.round(trans.getX() * newScale * graphScale);
					dy -= Math.round(trans.getY() * newScale * graphScale);
				}
			}
		}

		if (newScale != scale || translate.x != dx || translate.y != dy)
		{
			scale = newScale;
			translate.setLocation(dx, dy);

			return true;
		}
		else
		{
			return false;
		}
	}

	/**
	 *
	 */
	public class MouseTracker implements MouseListener, MouseMotionListener
	{
		/**
		 * 
		 */
		protected Point start = null;

		/*
		 * (non-Javadoc)
		 * @see java.awt.event.MouseListener#mousePressed(java.awt.event.MouseEvent)
		 */
		public void mousePressed(MouseEvent e)
		{
			zoomGesture = hitZoomHandle(e.getX(), e.getY());

			if (graphComponent != null && !e.isConsumed()
					&& !e.isPopupTrigger()
					&& (finderBounds.contains(e.getPoint()) || zoomGesture))
			{
				start = e.getPoint();
			}
		}

		/*
		 * (non-Javadoc)
		 * @see java.awt.event.MouseMotionListener#mouseDragged(java.awt.event.MouseEvent)
		 */
		public void mouseDragged(MouseEvent e)
		{
			if (isEnabled() && start != null)
			{
				if (zoomGesture)
				{
					Rectangle bounds = graphComponent.getViewport()
							.getViewRect();
					double viewRatio = bounds.getWidth() / bounds.getHeight();

					bounds = new Rectangle(finderBounds);
					bounds.width = (int) Math
							.max(0, (e.getX() - bounds.getX()));
					bounds.height = (int) Math.max(0,
							(bounds.getWidth() / viewRatio));

					updateFinderBounds(bounds, true);
				}
				else
				{
					// TODO: To enable constrained moving, that is, moving
					// into only x- or y-direction when shift is pressed,
					// we need the location of the first mouse event, since
					// the movement can not be constrained for incremental
					// steps as used below.
					int dx = (int) ((e.getX() - start.getX()) / scale);
					int dy = (int) ((e.getY() - start.getY()) / scale);

					// Keeps current location as start for delta movement
					// of the scrollbars
					start = e.getPoint();

					graphComponent.getHorizontalScrollBar().setValue(
							graphComponent.getHorizontalScrollBar().getValue()
									+ dx);
					graphComponent.getVerticalScrollBar().setValue(
							graphComponent.getVerticalScrollBar().getValue()
									+ dy);
				}
			}
		}

		/*
		 * (non-Javadoc)
		 * @see java.awt.event.MouseListener#mouseReleased(java.awt.event.MouseEvent)
		 */
		public void mouseReleased(MouseEvent e)
		{
			if (start != null)
			{
				if (zoomGesture)
				{
					double dx = e.getX() - start.getX();
					double w = finderBounds.getWidth();

					final JScrollBar hs = graphComponent
							.getHorizontalScrollBar();
					final double sx;

					if (hs != null)
					{
						sx = (double) hs.getValue() / hs.getMaximum();
					}
					else
					{
						sx = 0;
					}

					final JScrollBar vs = graphComponent.getVerticalScrollBar();
					final double sy;

					if (vs != null)
					{
						sy = (double) vs.getValue() / vs.getMaximum();
					}
					else
					{
						sy = 0;
					}

					mxGraphView view = graphComponent.getGraph().getView();
					double scale = view.getScale();
					double newScale = scale - (dx * scale) / w;
					double factor = newScale / scale;
					view.setScale(newScale);

					if (hs != null)
					{
						hs.setValue((int) (sx * hs.getMaximum() * factor));
					}

					if (vs != null)
					{
						vs.setValue((int) (sy * vs.getMaximum() * factor));
					}
				}

				zoomGesture = false;
				start = null;
			}
		}

		/**
		 * 
		 */
		public boolean hitZoomHandle(int x, int y)
		{
			return new Rectangle(finderBounds.x + finderBounds.width - 6,
					finderBounds.y + finderBounds.height - 6, 8, 8).contains(x,
					y);
		}

		/*
		 * (non-Javadoc)
		 * @see java.awt.event.MouseMotionListener#mouseMoved(java.awt.event.MouseEvent)
		 */
		public void mouseMoved(MouseEvent e)
		{
			if (hitZoomHandle(e.getX(), e.getY()))
			{
				setCursor(new Cursor(Cursor.HAND_CURSOR));
			}
			else if (finderBounds.contains(e.getPoint()))
			{
				setCursor(new Cursor(Cursor.MOVE_CURSOR));
			}
			else
			{
				setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
			}
		}

		/*
		 * (non-Javadoc)
		 * @see java.awt.event.MouseListener#mouseClicked(java.awt.event.MouseEvent)
		 */
		public void mouseClicked(MouseEvent e)
		{
			// ignore
		}

		/*
		 * (non-Javadoc)
		 * @see java.awt.event.MouseListener#mouseEntered(java.awt.event.MouseEvent)
		 */
		public void mouseEntered(MouseEvent e)
		{
			// ignore
		}

		/*
		 * (non-Javadoc)
		 * @see java.awt.event.MouseListener#mouseExited(java.awt.event.MouseEvent)
		 */
		public void mouseExited(MouseEvent e)
		{
			// ignore
		}

	}

}