mxgraphoutline.java

经典的java图像处理程序源码

/**
 * $Id: mxGraphOutline.java,v 1.18 2009/03/20 08:56:45 gaudenz Exp $
 * Copyright (c) 2008, Gaudenz Alder
 */
package com.mxgraph.swing;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Stroke;
import java.awt.event.AdjustmentEvent;
import java.awt.event.AdjustmentListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

import javax.swing.JComponent;
import javax.swing.JScrollBar;

import com.mxgraph.util.mxEvent;
import com.mxgraph.util.mxEventObject;
import com.mxgraph.util.mxPoint;
import com.mxgraph.util.mxRectangle;
import com.mxgraph.util.mxUtils;
import com.mxgraph.util.mxEventSource.mxIEventListener;
import com.mxgraph.view.mxGraphView;

/**
 * An outline view for a specific graph component.
 */
public class mxGraphOutline extends JComponent
{

	/**
	 * 
	 */
	public static Color DEFAULT_ZOOMHANDLE_FILL = new Color(0, 255, 255);

	/**
	 * 
	 */
	protected mxGraphComponent graphComponent;

	/**
	 * TODO: Not yet implemented.
	 */
	protected BufferedImage tripleBuffer;

	/**
	 * Holds the graphics of the triple buffer.
	 */
	protected Graphics2D tripleBufferGraphics;

	/**
	 * True if the triple buffer needs a full repaint.
	 */
	protected boolean repaintBuffer = false;

	/**
	 * Clip of the triple buffer to be repainted.
	 */
	protected mxRectangle repaintClip = null;

	/**
	 * 
	 */
	protected boolean tripleBuffered = true;

	/**
	 * 
	 */
	protected Rectangle finderBounds = new Rectangle();

	/**
	 * 
	 */
	protected Point zoomHandleLocation = null;

	/**
	 * 
	 */
	protected boolean finderVisible = true;

	/**
	 * 
	 */
	protected boolean zoomHandleVisible = true;

	/**
	 * 
	 */
	protected boolean useScaledInstance = false;

	/**
	 * 
	 */
	protected boolean antiAlias = false;

	/**
	 * 
	 */
	protected boolean drawLabels = false;

	/**
	 * Specifies if the outline should be zoomed to the page if the graph
	 * component is in page layout mode. Default is true.
	 */
	protected boolean fitPage = true;

	/**
	 * Not yet implemented.
	 * 
	 * Border to add around the page bounds if wholePage is true.
	 * Default is 4.
	 */
	protected int outlineBorder = 10;

	/**
	 * 
	 */
	protected MouseTracker tracker = new MouseTracker();

	/**
	 * 
	 */
	protected double scale = 1;

	/**
	 * 
	 */
	protected Point translate = new Point();

	/**
	 * 
	 */
	protected transient boolean zoomGesture = false;

	/**
	 * 
	 */
	protected mxIEventListener repaintHandler = new mxIEventListener()
	{
		public void invoke(Object source, mxEventObject evt)
		{
			updateScaleAndTranslate();
			mxRectangle dirty = (evt.getArgCount() > 0) ? (mxRectangle) evt
					.getArgAt(0) : null;

			if (dirty != null)
			{
				repaintClip = new mxRectangle(dirty);
			}
			else
			{
				repaintBuffer = true;
			}

			if (dirty != null)
			{
				updateFinder(true);

				dirty.grow(1 / scale);

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

				repaint(dirty.getRectangle());
			}
			else
			{
				updateFinder(false);
				repaint();
			}
		}
	};

	/**
	 * 
	 */
	protected ComponentListener componentHandler = new ComponentAdapter()
	{
		public void componentResized(ComponentEvent e)
		{
			if (updateScaleAndTranslate())
			{
				repaintBuffer = true;
				updateFinder(false);
				repaint();
			}
			else
			{
				updateFinder(true);
			}
		}
	};

	/**
	 * 
	 */
	protected AdjustmentListener adjustmentHandler = new AdjustmentListener()
	{

		/**
		 * 
		 */
		public void adjustmentValueChanged(AdjustmentEvent e)
		{
			if (updateScaleAndTranslate())
			{
				repaintBuffer = true;
				updateFinder(false);
				repaint();
			}
			else
			{
				updateFinder(true);
			}
		}

	};

	/**
	 * 
	 */
	public mxGraphOutline(mxGraphComponent graphComponent)
	{
		addComponentListener(componentHandler);
		addMouseMotionListener(tracker);
		addMouseListener(tracker);
		setGraphComponent(graphComponent);
		setEnabled(true);
		setOpaque(true);
	}

	/**
	 * Fires a property change event for <code>tripleBuffered</code>.
	 * 
	 * @param tripleBuffered the tripleBuffered to set
	 */
	public void setTripleBuffered(boolean tripleBuffered)
	{
		boolean oldValue = this.tripleBuffered;
		this.tripleBuffered = tripleBuffered;

		if (!tripleBuffered)
		{
			destroyTripleBuffer();
		}

		firePropertyChange("tripleBuffered", oldValue, tripleBuffered);
	}

	/**
	 * 
	 */
	public boolean isTripleBuffered()
	{
		return tripleBuffered;
	}

	/**
	 * Fires a property change event for <code>drawLabels</code>.
	 * 
	 * @param drawLabels the drawLabels to set
	 */
	public void setDrawLabels(boolean drawLabels)
	{
		boolean oldValue = this.drawLabels;
		this.drawLabels = drawLabels;
		repaintTripleBuffer(null);

		firePropertyChange("drawLabels", oldValue, drawLabels);
	}

	/**
	 * 
	 */
	public boolean isDrawLabels()
	{
		return drawLabels;
	}

	/**
	 * Fires a property change event for <code>antiAlias</code>.
	 * 
	 * @param antiAlias the antiAlias to set
	 */
	public void setAntiAlias(boolean antiAlias)
	{
		boolean oldValue = this.antiAlias;
		this.antiAlias = antiAlias;
		repaintTripleBuffer(null);

		firePropertyChange("antiAlias", oldValue, antiAlias);
	}

	/**
	 * @return the antiAlias
	 */
	public boolean isAntiAlias()
	{
		return antiAlias;
	}

	/**
	 * 
	 */
	public void setVisible(boolean visible)
	{
		super.setVisible(visible);

		// Frees memory if the outline is hidden
		if (!visible)
		{
			destroyTripleBuffer();
		}
	}

	/**
	 * 
	 */
	public void setFinderVisible(boolean visible)
	{
		finderVisible = visible;
	}

	/**
	 * 
	 */
	public void setZoomHandleVisible(boolean visible)
	{
		zoomHandleVisible = visible;
	}

	/**
	 * Fires a property change event for <code>fitPage</code>.
	 * 
	 * @param fitPage the fitPage to set
	 */
	public void setFitPage(boolean fitPage)
	{
		boolean oldValue = this.fitPage;
		this.fitPage = fitPage;

		if (updateScaleAndTranslate())
		{
			repaintBuffer = true;
			updateFinder(false);
		}

		firePropertyChange("fitPage", oldValue, fitPage);
	}

	/**
	 * 
	 */
	public boolean isFitPage()
	{
		return fitPage;
	}

	/**
	 * 
	 */
	public mxGraphComponent getGraphComponent()
	{
		return graphComponent;
	}

	/**
	 * Fires a property change event for <code>graphComponent</code>.
	 * 
	 * @param graphComponent the graphComponent to set
	 */
	public void setGraphComponent(mxGraphComponent graphComponent)
	{
		mxGraphComponent oldValue = this.graphComponent;

		if (this.graphComponent != null)
		{
			this.graphComponent.getGraph().removeListener(repaintHandler);
			this.graphComponent.getGraphControl().removeComponentListener(
					componentHandler);
			this.graphComponent.getHorizontalScrollBar()
					.removeAdjustmentListener(adjustmentHandler);
			this.graphComponent.getVerticalScrollBar()
					.removeAdjustmentListener(adjustmentHandler);
		}

		this.graphComponent = graphComponent;

		if (this.graphComponent != null)
		{
			this.graphComponent.getGraph().addListener(mxEvent.REPAINT,
					repaintHandler);
			this.graphComponent.getGraphControl().addComponentListener(
					componentHandler);
			this.graphComponent.getHorizontalScrollBar().addAdjustmentListener(
					adjustmentHandler);
			this.graphComponent.getVerticalScrollBar().addAdjustmentListener(
					adjustmentHandler);
		}

		if (updateScaleAndTranslate())
		{
			repaintBuffer = true;
			repaint();
		}

		firePropertyChange("graphComponent", oldValue, graphComponent);
	}

	/**
	 * Checks if the triple buffer exists and creates a new one if
	 * it does not. Also compares the size of the buffer with the
	 * size of the graph and drops the buffer if it has a
	 * different size.
	 */
	public void checkTripleBuffer()
	{
		if (tripleBuffer != null)
		{
			if (tripleBuffer.getWidth() != getWidth()
					|| tripleBuffer.getHeight() != getHeight())
			{
				// Resizes the buffer (destroys existing and creates new)
				destroyTripleBuffer();
			}
		}

		if (tripleBuffer == null)
		{
			createTripleBuffer(getWidth(), getHeight());
		}
	}

	/**
	 * Creates the tripleBufferGraphics and tripleBuffer for the given
	 * dimension and draws the complete graph onto the triplebuffer.
	 * 
	 * @param width
	 * @param height
	 */
	protected void createTripleBuffer(int width, int height)
	{
		try
		{
			tripleBuffer = mxUtils.createBufferedImage(width, height, null);
			tripleBufferGraphics = tripleBuffer.createGraphics();

			// Repaints the complete buffer
			repaintTripleBuffer(null);
		}
		catch (OutOfMemoryError error)
		{
			// ignore
		}
	}

	/**
	 * Destroys the tripleBuffer and tripleBufferGraphics objects.
	 */
	public void destroyTripleBuffer()
	{
		if (tripleBuffer != null)
		{
			tripleBuffer = null;