tesseract(google关于ocr的一个开源库)

// 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 wanke@google.com */ 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 / canvasSiz