svwindow.java

来自「一个google的OCR源码」· Java 代码 · 共 644 行 · 第 1/2 页

// Copyright 2007 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"); You may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by
// applicable law or agreed to in writing, software distributed under the
// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
// OF ANY KIND, either express or implied. See the License for the specific
// language governing permissions and limitations under the License.

package com.google.scrollview.ui;

import com.google.scrollview.ScrollView;
import com.google.scrollview.events.SVEvent;
import com.google.scrollview.events.SVEventHandler;
import com.google.scrollview.events.SVEventType;
import com.google.scrollview.ui.SVImageHandler;
import com.google.scrollview.ui.SVMenuBar;
import com.google.scrollview.ui.SVPopupMenu;

import edu.umd.cs.piccolo.PCamera;
import edu.umd.cs.piccolo.PCanvas;
import edu.umd.cs.piccolo.PLayer;

import edu.umd.cs.piccolo.nodes.PImage;
import edu.umd.cs.piccolo.nodes.PPath;
import edu.umd.cs.piccolo.nodes.PText;
import edu.umd.cs.piccolo.util.PPaintContext;
import edu.umd.cs.piccolox.swing.PScrollPane;

import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GraphicsEnvironment;
import java.awt.geom.IllegalPathStateException;
import java.awt.Rectangle;
import java.awt.TextArea;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;

/**
 * The SVWindow is the top-level ui class. It should get instantiated whenever
 * the user intends to create a new window. It contains helper functions to draw
 * on the canvas, add new menu items, show modal dialogs etc.
 *
 * @author [e-mail]
 */
public class SVWindow extends JFrame {
  /**
   * Constants defining the maximum initial size of the window.
   */
  private static final int MAX_WINDOW_X = 1000;
  private static final int MAX_WINDOW_Y = 800;

  /* Constant defining the (approx) height of the default message box*/
  private static final int DEF_MESSAGEBOX_HEIGHT = 200;

  /** Constant defining the "speed" at which to zoom in and out. */
  public static final double SCALING_FACTOR = 2;

  /** The top level layer we add our PNodes to (root node). */
  PLayer layer;

  /** The current color of the pen. It is used to draw edges, text, etc. */
  Color currentPenColor;

  /**
   * The current color of the brush. It is used to draw the interior of
   * primitives.
   */
  Color currentBrushColor;

  /** The system name of the current font we are using (e.g.
   *  "Times New Roman"). */
  Font currentFont;

  /** The stroke width to be used. */
  // This really needs to be a fixed width stroke as the basic stroke is
  // anti-aliased and gets too faint, but the piccolo fixed width stroke
  // is too buggy and generates missing initial moveto in path definition
  // errors with a IllegalPathStateException that cannot be caught because
  // it is in the automatic repaint function. If we can fix the exceptions
  // in piccolo, then we can use the following instead of BasicStroke:
  //   import edu.umd.cs.piccolox.util.PFixedWidthStroke;
  //   PFixedWidthStroke stroke = new PFixedWidthStroke(0.5f);
  // Instead we use the BasicStroke and turn off anti-aliasing.
  BasicStroke stroke = new BasicStroke(0.5f);

  /**
   * A unique representation for the window, also known by the client. It is
   * used when sending messages from server to client to identify him.
   */
  public int hash;

  /**
   * The total number of created Windows. If this ever reaches 0 (apart from the
   * beginning), quit the server.
   */
  public static int nrWindows = 0;

  /**
   * The Canvas, MessageBox, EventHandler, Menubar and Popupmenu associated with
   * this window.
   */
  private SVEventHandler svEventHandler = null;
  private SVMenuBar svMenuBar = null;
  private TextArea ta = null;
  public SVPopupMenu svPuMenu = null;
  public PCanvas canvas;
  private int winSizeX;
  private int winSizeY;

  /** Set the brush to an RGB color */
  public void brush(int red, int green, int blue) {
    brush(red, green, blue, 255);
  }

  /** Set the brush to an RGBA color */
  public void brush(int red, int green, int blue, int alpha) {
    // If alpha is zero, use a null brush to save rendering time.
    if (alpha == 0) {
      currentBrushColor = null;
    } else {
      currentBrushColor = new Color(red, green, blue, alpha);
    }
  }

  /** Erase all content from the window, but do not destroy it. */
  public void clear() {
    layer.removeAllChildren();
  }

  /**
   * Start setting up a new image. The server will now expect image data until
   * the image is complete.
   *
   * @param internalName The unique name of the new image
   * @param width Image width
   * @param height Image height
   * @param bitsPerPixel The bit depth (currently supported: 1 (binary) and 32
   *        (ARGB))
   */
  public void createImage(String internalName, int width, int height,
      int bitsPerPixel) {
    SVImageHandler.createImage(internalName, width, height, bitsPerPixel);
  }

  /**
   * Start setting up a new polyline. The server will now expect
   * polyline data until the polyline is complete.
   *
   * @param length number of coordinate pairs
   */
  public void createPolyline(int length) {
    ScrollView.polylineXCoords = new float[length];
    ScrollView.polylineYCoords = new float[length];
    ScrollView.polylineSize = length;
    ScrollView.polylineScanned = 0;
  }

  /**
   * Draw the now complete polyline.
   */
  public void drawPolyline() {
    PPath pn = PPath.createPolyline(ScrollView.polylineXCoords,
                                    ScrollView.polylineYCoords);
    ScrollView.polylineSize = 0;
    pn.setStrokePaint(currentPenColor);
    pn.setPaint(null);  // Don't fill the polygon - this is just a polyline.
    pn.setStroke(stroke);
    layer.addChild(pn);
  }

  /**
   * Construct a new SVWindow and set it visible.
   *
   * @param name Title of the window.
   * @param hash Unique internal representation. This has to be the same as
   *        defined by the client, as they use this to refer to the windows.
   * @param posX X position of where to draw the window (upper left).
   * @param posY Y position of where to draw the window (upper left).
   * @param sizeX The width of the window.
   * @param sizeY The height of the window.
   * @param canvasSizeX The canvas width of the window.
   * @param canvasSizeY The canvas height of the window.
   */
  public SVWindow(String name, int hash, int posX, int posY, int sizeX,
                  int sizeY, int canvasSizeX, int canvasSizeY) {
    super(name);

    // Provide defaults for sizes.
    if (sizeX == 0) sizeX = canvasSizeX;
    if (sizeY == 0) sizeY = canvasSizeY;
    if (canvasSizeX == 0) canvasSizeX = sizeX;
    if (canvasSizeY == 0) canvasSizeY = sizeY;

    // Initialize variables
    nrWindows++;
    this.hash = hash;
    this.svEventHandler = new SVEventHandler(this);
    this.currentPenColor = Color.BLACK;
    this.currentBrushColor = Color.BLACK;
    this.currentFont = new Font("Times New Roman", Font.PLAIN, 12);

    // Determine the initial size and zoom factor of the window.
    // If the window is too big, rescale it and zoom out.
    int shrinkfactor = 1;

    if (sizeX > MAX_WINDOW_X) {
      shrinkfactor = (sizeX + MAX_WINDOW_X - 1) / MAX_WINDOW_X;
    }
    if (sizeY / shrinkfactor > MAX_WINDOW_Y) {
      shrinkfactor = (sizeY + MAX_WINDOW_Y - 1) / MAX_WINDOW_Y;
    }
    winSizeX = sizeX / shrinkfactor;
    winSizeY = sizeY / shrinkfactor;
    double initialScalingfactor = 1.0 / shrinkfactor;
    if (winSizeX > canvasSizeX || winSizeY > canvasSizeY) {
      initialScalingfactor = Math.min(1.0 * winSizeX / canvasSizeX,
                                      1.0 * winSizeY / canvasSizeY);
    }

    // Setup the actual window (its size, camera, title, etc.)
    if (canvas == null) {
      canvas = new PCanvas();
      getContentPane().add(canvas, BorderLayout.CENTER);
    }

    layer = canvas.getLayer();
    canvas.setBackground(Color.BLACK);

    // Disable anitaliasing to make the lines more visible.
    canvas.setDefaultRenderQuality(PPaintContext.LOW_QUALITY_RENDERING);

    setLayout(new BorderLayout());

    setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);

    validate();
    canvas.requestFocus();

    // Manipulation of Piccolo's scene graph should be done from Swings
    // event dispatch thread since Piccolo is not thread safe. This code calls
    // initialize() from that thread once the PFrame is initialized, so you are
    // safe to start working with Piccolo in the initialize() method.
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        repaint();
      }
    });

    setSize(winSizeX, winSizeY);
    setLocation(posX, posY);
    setTitle(name);

    // Add a Scrollpane to be able to scroll within the canvas
    PScrollPane scrollPane = new PScrollPane(canvas);
    getContentPane().add(scrollPane);
    scrollPane.setWheelScrollingEnabled(false);
    PCamera lc = canvas.getCamera();
    lc.scaleViewAboutPoint(initialScalingfactor, 0, 0);

    // Disable the default event handlers and add our own.
    addWindowListener(svEventHandler);
    canvas.removeInputEventListener(canvas.getPanEventHandler());
    canvas.removeInputEventListener(canvas.getZoomEventHandler());
    canvas.addInputEventListener(svEventHandler);
    canvas.addKeyListener(svEventHandler);

    // Make the window visible.
    validate();
    setVisible(true);

  }

  /**
   * Convenience function to add a message box to the window which can be used
   * to output debug information.
   */
  public void addMessageBox() {
    if (ta == null) {
      ta = new TextArea();
      ta.setEditable(false);
      getContentPane().add(ta, BorderLayout.SOUTH);
    }
    // We need to make the window bigger to accomodate the message box.
    winSizeY += DEF_MESSAGEBOX_HEIGHT;
    setSize(winSizeX, winSizeY);
  }

  /**
   * Allows you to specify the thickness with which to draw lines, recantgles
   * and ellipses.
   * @param width The new thickness.
   */
  public void setStrokeWidth(float width) {
    // If this worked we wouldn't need the antialiased rendering off.
    // stroke = new PFixedWidthStroke(width);
    stroke = new BasicStroke(width);
  }

  /**
   * Draw an ellipse at (x,y) with given width and height, using the
   * current stroke, the current brush color to fill it and the
   * current pen color for the outline.
   */
  public void drawEllipse(int x, int y, int width, int height) {
    PPath pn = PPath.createEllipse(x, y, width, height);
    pn.setStrokePaint(currentPenColor);
    pn.setStroke(stroke);
    pn.setPaint(currentBrushColor);
    layer.addChild(pn);
  }

  /**
   * Draw the image with the given name at (x,y). Any image loaded stays in