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annotate dwtx/draw2d/PrintOperation.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwtx.draw2d.PrintOperation;
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14
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15 import dwt.dwthelper.utils;
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16
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17 static import dwt.graphics.Rectangle;
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18 static import dwt.graphics.Point;
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19
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20 import dwt.DWT;
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21 import dwt.graphics.GC;
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22 import dwt.printing.Printer;
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23 import dwtx.draw2d.geometry.Insets;
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24 import dwtx.draw2d.geometry.Rectangle;
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25 import dwtx.draw2d.PrinterGraphics;
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26 import dwtx.draw2d.SWTGraphics;
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27
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28
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29 /**
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30 * Implementation of draw2d's printing capabilities.
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31 *
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32 * @author Dan Lee
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33 * @author Eric Bordeau
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34 */
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35 public abstract class PrintOperation {
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36
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37 private GC printerGC; // Note: Only one GC instance should be created per print job
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38 private Insets printMargin;
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39 private Printer printer;
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40 private PrinterGraphics printerGraphics;
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41 private SWTGraphics g;
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42
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43 /**
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44 * Creates a new PrintOperation
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45 */
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46 public this() {
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47 printMargin = new Insets(0, 0, 0, 0);
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48 }
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49
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50 /**
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51 * Creates a new PrintOperation on Printer p
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52 * @param p The printer to print on
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53 */
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54 public this(Printer p) {
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55 this();
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56 setPrinter(p);
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57 }
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58
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59 /**
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60 * Disposes the PrinterGraphics and GC objects associated with this PrintOperation.
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61 */
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62 protected void cleanup() {
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63 if (g !is null) {
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64 printerGraphics.dispose();
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65 g.dispose();
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66 }
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67 if (printerGC !is null)
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68 printerGC.dispose();
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69 }
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70
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71 /**
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72 * Returns a new PrinterGraphics setup for the Printer associated with this
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73 * PrintOperation.
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74 *
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75 * @return PrinterGraphics The new PrinterGraphics
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76 */
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77 protected PrinterGraphics getFreshPrinterGraphics() {
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78 if (printerGraphics !is null) {
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79 printerGraphics.dispose();
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80 g.dispose();
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81 printerGraphics = null;
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82 g = null;
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83 }
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84 g = new SWTGraphics(printerGC);
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85 printerGraphics = new PrinterGraphics(g, printer);
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86 setupGraphicsForPage(printerGraphics);
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87 return printerGraphics;
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88 }
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89
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90 /**
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91 * This method is invoked by the {@link #run(String)} method to determine the orientation
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92 * of the GC to be used for printing. This default implementation always returns
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93 * DWT.LEFT_TO_RIGHT.
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94 * @return DWT.LEFT_TO_RIGHT or DWT.RIGHT_TO_LEFT
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95 * @since 3.1
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96 * @TODO Make protected post-3.1
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97 */
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98 int getGraphicsOrientation() {
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99 return DWT.LEFT_TO_RIGHT;
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100 }
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101
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102 /**
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103 * Returns the printer.
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104 * @return Printer
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105 */
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106 public Printer getPrinter() {
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107 return printer;
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108 }
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109
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110 /**
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111 * Returns a Rectangle that represents the region that can be printed to. The x, y,
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112 * height, and width values are using the printers coordinates.
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113 * @return the print region
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114 */
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115 public Rectangle getPrintRegion() {
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116 dwt.graphics.Rectangle.Rectangle trim = printer.computeTrim(0, 0, 0, 0);
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117 dwt.graphics.Point.Point printerDPI = printer.getDPI();
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118 Insets notAvailable = new Insets(-trim.y, -trim.x,
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119 trim.height + trim.y, trim.width + trim.x);
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120 Insets userPreferred = new Insets(
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121 (printMargin.top * printerDPI.x) / 72,
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122 (printMargin.left * printerDPI.x) / 72,
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123 (printMargin.bottom * printerDPI.x) / 72,
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124 (printMargin.right * printerDPI.x) / 72);
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125 Rectangle paperBounds = new Rectangle(printer.getBounds());
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126 Rectangle printRegion = paperBounds.getCropped(notAvailable);
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127 printRegion.intersect(paperBounds.getCropped(userPreferred));
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128 printRegion.translate(trim.x, trim.y);
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129 return printRegion;
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130 }
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131
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132 /**
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133 * This method contains all operations performed to sourceFigure prior to being printed.
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134 */
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135 protected void preparePrintSource() { }
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136
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137 /**
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138 * This method is responsible for printing pages. (A page is printed by calling
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139 * Printer.startPage(), followed by painting to the PrinterGraphics object, and then
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140 * calling Printer.endPage()).
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141 */
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142 protected abstract void printPages();
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143
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144 /**
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145 * This method contains all operations performed to
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146 * sourceFigure after being printed.
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147 */
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148 protected void restorePrintSource() { }
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149
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150 /**
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151 * Sets the print job into motion.
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152 *
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153 * @param jobName A String representing the name of the print job
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154 */
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155 public void run(String jobName) {
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156 preparePrintSource();
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157 if (printer.startJob(jobName)) {
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158 printerGC = new GC(getPrinter(), getGraphicsOrientation());
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159 printPages();
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160 printer.endJob();
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161 }
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162 restorePrintSource();
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163 cleanup();
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164 }
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165
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166 /**
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167 * Sets the printer.
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168 * @param printer The printer to set
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169 */
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170 public void setPrinter(Printer printer) {
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171 this.printer = printer;
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172 }
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173
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174 /**
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175 * Sets the page margin in pels (logical pixels) to the passed Insets.(72 pels is 1 inch)
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176 *
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177 * @param margin The margin to set on the page
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178 */
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179 public void setPrintMargin(Insets margin) {
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180 printMargin = margin;
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181 }
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182
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183 /**
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184 * Manipulates the PrinterGraphics to position it to paint in the desired region of the
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185 * page. (Default is the top left corner of the page).
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186 *
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187 * @param pg The PrinterGraphics to setup
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188 */
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189 protected void setupGraphicsForPage(PrinterGraphics pg) {
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190 Rectangle printRegion = getPrintRegion();
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191 pg.clipRect(printRegion);
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192 pg.translate(printRegion.getTopLeft());
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193 }
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194
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195 }