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annotate dwt/graphics/Transform.d @ 3:649b8e223d5a

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fix extends
author Frank Benoit <benoit@tionex.de>
date Wed, 27 Aug 2008 13:48:25 +0200
parents 380af2bdd8e5
children 1a8b3cb347e0
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2007 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 *******************************************************************************/
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11 module dwt.graphics.Transform;
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12
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13 import dwt.dwthelper.utils;
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14
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15 import dwt.DWT;
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16 import dwt.DWTError;
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17 import dwt.DWTException;
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18 import dwt.internal.cocoa.NSAffineTransform;
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19 import dwt.internal.cocoa.NSAffineTransformStruct;
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20 import dwt.internal.cocoa.NSPoint;
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21
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22 /**
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23 * Instances of this class represent transformation matrices for
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24 * points expressed as (x, y) pairs of floating point numbers.
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25 * <p>
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26 * Application code must explicitly invoke the <code>Transform.dispose()</code>
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27 * method to release the operating system resources managed by each instance
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28 * when those instances are no longer required.
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29 * </p>
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30 * <p>
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31 * This class requires the operating system's advanced graphics subsystem
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32 * which may not be available on some platforms.
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33 * </p>
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34 *
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35 * @since 3.1
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36 */
3
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37 public class Transform : Resource {
0
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38 /**
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39 * the OS resource for the Transform
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40 * (Warning: This field is platform dependent)
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41 * <p>
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42 * <b>IMPORTANT:</b> This field is <em>not</em> part of the DWT
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43 * public API. It is marked public only so that it can be shared
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44 * within the packages provided by DWT. It is not available on all
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45 * platforms and should never be accessed from application code.
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46 * </p>
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47 */
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48 public NSAffineTransform handle;
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49
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50 /**
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51 * Constructs a new identity Transform.
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52 * <p>
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53 * This operation requires the operating system's advanced
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54 * graphics subsystem which may not be available on some
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55 * platforms.
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56 * </p>
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57 *
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58 * @param device the device on which to allocate the Transform
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59 *
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60 * @exception IllegalArgumentException <ul>
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61 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
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62 * </ul>
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63 * @exception DWTException <ul>
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64 * <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
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65 * </ul>
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66 * @exception DWTError <ul>
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67 * <li>ERROR_NO_HANDLES if a handle for the Transform could not be obtained</li>
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68 * </ul>
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69 *
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70 * @see #dispose()
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71 */
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72 public Transform (Device device) {
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73 this(device, 1, 0, 0, 1, 0, 0);
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74 }
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75
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76 /**
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77 * Constructs a new Transform given an array of elements that represent the
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78 * matrix that describes the transformation.
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79 * <p>
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80 * This operation requires the operating system's advanced
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81 * graphics subsystem which may not be available on some
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82 * platforms.
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83 * </p>
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84 *
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85 * @param device the device on which to allocate the Transform
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86 * @param elements an array of floats that describe the transformation matrix
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87 *
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88 * @exception IllegalArgumentException <ul>
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89 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device, or the elements array is null</li>
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90 * <li>ERROR_INVALID_ARGUMENT - if the elements array is too small to hold the matrix values</li>
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91 * </ul>
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92 * @exception DWTException <ul>
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93 * <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
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94 * </ul>
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95 * @exception DWTError <ul>
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96 * <li>ERROR_NO_HANDLES if a handle for the Transform could not be obtained</li>
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97 * </ul>
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98 *
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99 * @see #dispose()
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100 */
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101 public Transform(Device device, float[] elements) {
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102 this (device, checkTransform(elements)[0], elements[1], elements[2], elements[3], elements[4], elements[5]);
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103 }
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104
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105 /**
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106 * Constructs a new Transform given all of the elements that represent the
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107 * matrix that describes the transformation.
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108 * <p>
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109 * This operation requires the operating system's advanced
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110 * graphics subsystem which may not be available on some
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111 * platforms.
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112 * </p>
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113 *
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114 * @param device the device on which to allocate the Transform
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115 * @param m11 the first element of the first row of the matrix
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116 * @param m12 the second element of the first row of the matrix
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117 * @param m21 the first element of the second row of the matrix
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118 * @param m22 the second element of the second row of the matrix
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119 * @param dx the third element of the first row of the matrix
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120 * @param dy the third element of the second row of the matrix
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121 *
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122 * @exception IllegalArgumentException <ul>
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123 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
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124 * </ul>
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125 * @exception DWTException <ul>
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126 * <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
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127 * </ul>
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128 * @exception DWTError <ul>
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129 * <li>ERROR_NO_HANDLES if a handle for the Transform could not be obtained</li>
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130 * </ul>
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131 *
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132 * @see #dispose()
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133 */
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134 public Transform (Device device, float m11, float m12, float m21, float m22, float dx, float dy) {
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135 super(device);
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136 handle = NSAffineTransform.transform();
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137 if (handle is null) DWT.error(DWT.ERROR_NO_HANDLES);
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138 handle.retain();
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139 setElements(m11, m12, m21, m22, dx, dy);
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140 init();
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141 }
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142
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143 static float[] checkTransform(float[] elements) {
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144 if (elements is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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145 if (elements.length < 6) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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146 return elements;
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147 }
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148
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149 void destroy() {
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150 handle.release();
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151 handle = null;
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152 }
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153
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154 /**
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155 * Fills the parameter with the values of the transformation matrix
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156 * that the receiver represents, in the order {m11, m12, m21, m22, dx, dy}.
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157 *
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158 * @param elements array to hold the matrix values
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159 *
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160 * @exception DWTException <ul>
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161 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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162 * </ul>
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163 * @exception IllegalArgumentException <ul>
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164 * <li>ERROR_NULL_ARGUMENT - if the parameter is null</li>
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165 * <li>ERROR_INVALID_ARGUMENT - if the parameter is too small to hold the matrix values</li>
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166 * </ul>
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167 */
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168 public void getElements(float[] elements) {
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169 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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170 if (elements is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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171 if (elements.length < 6) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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172 NSAffineTransformStruct struct = handle.transformStruct();
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173 elements[0] = struct.m11;
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174 elements[1] = struct.m12;
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175 elements[2] = struct.m21;
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176 elements[3] = struct.m22;
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177 elements[4] = struct.tX;
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178 elements[5] = struct.tY;
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179 }
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180
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181 public void identity() {
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182 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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183 NSAffineTransformStruct struct = new NSAffineTransformStruct();
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184 struct.m11 = 1;
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185 struct.m22 = 1;
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186 handle.setTransformStruct(struct);
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187 }
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188
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189 /**
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190 * Modifies the receiver such that the matrix it represents becomes the
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191 * the mathematical inverse of the matrix it previously represented.
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192 *
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193 * @exception DWTException <ul>
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194 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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195 * <li>ERROR_CANNOT_INVERT_MATRIX - if the matrix is not invertible</li>
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196 * </ul>
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197 */
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198 public void invert() {
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199 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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200 NSAffineTransformStruct struct = handle.transformStruct();
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201 if ((struct.m11 * struct.m22 - struct.m12 * struct.m21) is 0) {
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202 DWT.error(DWT.ERROR_CANNOT_INVERT_MATRIX);
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203 }
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204 handle.invert();
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205 }
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206
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207 /**
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208 * Returns <code>true</code> if the Transform has been disposed,
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209 * and <code>false</code> otherwise.
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210 * <p>
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211 * This method gets the dispose state for the Transform.
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212 * When a Transform has been disposed, it is an error to
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213 * invoke any other method using the Transform.
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214 *
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215 * @return <code>true</code> when the Transform is disposed, and <code>false</code> otherwise
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216 */
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217 public bool isDisposed() {
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218 return handle is null;
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219 }
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220
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221 /**
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222 * Returns <code>true</code> if the Transform represents the identity matrix
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223 * and false otherwise.
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224 *
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225 * @return <code>true</code> if the receiver is an identity Transform, and <code>false</code> otherwise
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226 */
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227 public bool isIdentity() {
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228 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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229 NSAffineTransformStruct struct = handle.transformStruct();
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230 return struct.m11 is 1 && struct.m12 is 0 && struct.m21 is 0 && struct.m22 is 1 && struct.tX is 0 && struct.tY is 0;
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231 }
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232
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233 /**
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234 * Modifies the receiver such that the matrix it represents becomes the
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235 * the result of multiplying the matrix it previously represented by the
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236 * argument.
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237 *
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238 * @param matrix the matrix to multiply the receiver by
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239 *
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240 * @exception DWTException <ul>
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241 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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242 * </ul>
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243 * @exception IllegalArgumentException <ul>
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244 * <li>ERROR_NULL_ARGUMENT - if the parameter is null</li>
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245 * <li>ERROR_INVALID_ARGUMENT - if the parameter has been disposed</li>
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246 * </ul>
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247 */
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248 public void multiply(Transform matrix) {
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249 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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250 if (matrix is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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251 if (matrix.isDisposed()) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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252 handle.prependTransform(matrix.handle);
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253 }
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254
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255 /**
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256 * Modifies the receiver so that it represents a transformation that is
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257 * equivalent to its previous transformation rotated by the specified angle.
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258 * The angle is specified in degrees and for the identity transform 0 degrees
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259 * is at the 3 o'clock position. A positive value indicates a clockwise rotation
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260 * while a negative value indicates a counter-clockwise rotation.
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261 *
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262 * @param angle the angle to rotate the transformation by
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263 *
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264 * @exception DWTException <ul>
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265 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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266 * </ul>
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267 */
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268 public void rotate(float angle) {
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269 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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270 handle.rotateByDegrees(angle);
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271 }
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272
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273 /**
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274 * Modifies the receiver so that it represents a transformation that is
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275 * equivalent to its previous transformation scaled by (scaleX, scaleY).
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276 *
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277 * @param scaleX the amount to scale in the X direction
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278 * @param scaleY the amount to scale in the Y direction
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279 *
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280 * @exception DWTException <ul>
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281 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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282 * </ul>
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283 */
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284 public void scale(float scaleX, float scaleY) {
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285 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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286 handle.scaleXBy(scaleX, scaleY);
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287 }
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288
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289 /**
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290 * Modifies the receiver to represent a new transformation given all of
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291 * the elements that represent the matrix that describes that transformation.
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292 *
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293 * @param m11 the first element of the first row of the matrix
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294 * @param m12 the second element of the first row of the matrix
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295 * @param m21 the first element of the second row of the matrix
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296 * @param m22 the second element of the second row of the matrix
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297 * @param dx the third element of the first row of the matrix
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298 * @param dy the third element of the second row of the matrix
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299 *
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300 * @exception DWTException <ul>
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301 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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302 * </ul>
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303 */
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304 public void setElements(float m11, float m12, float m21, float m22, float dx, float dy) {
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305 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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306 NSAffineTransformStruct struct = new NSAffineTransformStruct();
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307 struct.m11 = m11;
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308 struct.m12 = m12;
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309 struct.m21 = m21;
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310 struct.m22 = m22;
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311 struct.tX = dx;
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312 struct.tY = dy;
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313 handle.setTransformStruct(struct);
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314 }
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315
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316 public void shear(float shearX, float shearY) {
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317 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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318 NSAffineTransformStruct struct = new NSAffineTransformStruct();
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319 struct.m11 = 1;
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320 struct.m12 = shearX;
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321 struct.m21 = shearY;
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322 struct.m22 = 1;
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323 NSAffineTransform matrix = NSAffineTransform.transform();
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324 matrix.setTransformStruct(struct);
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325 handle.prependTransform(matrix);
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326 }
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327
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328 /**
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329 * Given an array containing points described by alternating x and y values,
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330 * modify that array such that each point has been replaced with the result of
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331 * applying the transformation represented by the receiver to that point.
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332 *
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333 * @param pointArray an array of alternating x and y values to be transformed
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334 *
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335 * @exception IllegalArgumentException <ul>
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336 * <li>ERROR_NULL_ARGUMENT - if the point array is null</li>
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337 * </ul>
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338 * @exception DWTException <ul>
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339 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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340 * </ul>
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341 */
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342 public void transform(float[] pointArray) {
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343 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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344 if (pointArray is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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345 NSPoint point = new NSPoint();
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346 int length = pointArray.length / 2;
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347 for (int i = 0, j = 0; i < length; i++, j += 2) {
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348 point.x = pointArray[j];
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349 point.y = pointArray[j + 1];
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350 point = handle.transformPoint(point);
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351 pointArray[j] = point.x;
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352 pointArray[j + 1] = point.y;
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353 }
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354 }
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355
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356 /**
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357 * Modifies the receiver so that it represents a transformation that is
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358 * equivalent to its previous transformation translated by (offsetX, offsetY).
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359 *
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360 * @param offsetX the distance to translate in the X direction
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361 * @param offsetY the distance to translate in the Y direction
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362 *
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363 * @exception DWTException <ul>
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364 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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365 * </ul>
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366 */
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367 public void translate(float offsetX, float offsetY) {
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368 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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369 handle.translateXBy(offsetX, offsetY);
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370 }
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371
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372 /**
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373 * Returns a string containing a concise, human-readable
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374 * description of the receiver.
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375 *
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376 * @return a string representation of the receiver
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377 */
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378 public String toString() {
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379 if (isDisposed()) return "Transform {*DISPOSED*}";
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380 float[] elements = new float[6];
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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381 getElements(elements);
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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382 return "Transform {" + elements [0] + ", " + elements [1] + ", " +elements [2] + ", " +elements [3] + ", " +elements [4] + ", " +elements [5] + "}";
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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383 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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384
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385 }