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annotate org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/graphics/Transform.d @ 0:6dd524f61e62

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add dwt win and basic java stuff
author Frank Benoit <benoit@tionex.de>
date Mon, 02 Mar 2009 14:44:16 +0100
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children 6bf2837c50fe
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 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 org.eclipse.swt.graphics.Transform;
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14
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15 import org.eclipse.swt.SWT;
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16 import org.eclipse.swt.SWTError;
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17 import org.eclipse.swt.SWTException;
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18 import org.eclipse.swt.internal.gdip.Gdip;
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19
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20 import org.eclipse.swt.graphics.Resource;
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21 import org.eclipse.swt.graphics.Device;
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22
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23 import tango.text.convert.Format;
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24 import java.lang.all;
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25
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26 /**
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27 * Instances of this class represent transformation matrices for
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28 * points expressed as (x, y) pairs of floating point numbers.
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29 * <p>
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30 * Application code must explicitly invoke the <code>Transform.dispose()</code>
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31 * method to release the operating system resources managed by each instance
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32 * when those instances are no longer required.
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33 * </p>
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34 * <p>
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35 * This class requires the operating system's advanced graphics subsystem
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36 * which may not be available on some platforms.
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37 * </p>
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38 *
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39 * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: GraphicsExample</a>
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40 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
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41 *
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42 * @since 3.1
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43 */
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44 public class Transform : Resource {
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45 alias Resource.init_ init_;
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46 /**
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47 * the OS resource for the Transform
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48 * (Warning: This field is platform dependent)
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49 * <p>
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50 * <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT
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51 * public API. It is marked public only so that it can be shared
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52 * within the packages provided by SWT. It is not available on all
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53 * platforms and should never be accessed from application code.
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54 * </p>
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55 */
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56 public Gdip.Matrix handle;
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57
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58 /**
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59 * Constructs a new identity Transform.
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60 * <p>
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61 * This operation requires the operating system's advanced
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62 * graphics subsystem which may not be available on some
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63 * platforms.
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64 * </p>
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65 *
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66 * @param device the device on which to allocate the Transform
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67 *
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68 * @exception IllegalArgumentException <ul>
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69 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
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70 * </ul>
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71 * @exception SWTException <ul>
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72 * <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
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73 * </ul>
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74 * @exception SWTError <ul>
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75 * <li>ERROR_NO_HANDLES if a handle for the Transform could not be obtained</li>
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76 * </ul>
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77 *
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78 * @see #dispose()
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79 */
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80 public this (Device device) {
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81 this(device, 1, 0, 0, 1, 0, 0);
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82 }
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83
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84 /**
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85 * Constructs a new Transform given an array of elements that represent the
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86 * matrix that describes the transformation.
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87 * <p>
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88 * This operation requires the operating system's advanced
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89 * graphics subsystem which may not be available on some
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90 * platforms.
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91 * </p>
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92 *
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93 * @param device the device on which to allocate the Transform
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94 * @param elements an array of floats that describe the transformation matrix
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95 *
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96 * @exception IllegalArgumentException <ul>
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97 * <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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98 * <li>ERROR_INVALID_ARGUMENT - if the elements array is too small to hold the matrix values</li>
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99 * </ul>
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100 * @exception SWTException <ul>
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101 * <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
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102 * </ul>
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103 * @exception SWTError <ul>
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104 * <li>ERROR_NO_HANDLES if a handle for the Transform could not be obtained</li>
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105 * </ul>
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106 *
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107 * @see #dispose()
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108 */
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109 public this(Device device, float[] elements) {
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110 this (device, checkTransform(elements)[0], elements[1], elements[2], elements[3], elements[4], elements[5]);
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111 }
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112
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113 /**
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114 * Constructs a new Transform given all of the elements that represent the
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115 * matrix that describes the transformation.
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116 * <p>
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117 * This operation requires the operating system's advanced
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118 * graphics subsystem which may not be available on some
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119 * platforms.
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120 * </p>
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121 *
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122 * @param device the device on which to allocate the Transform
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123 * @param m11 the first element of the first row of the matrix
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124 * @param m12 the second element of the first row of the matrix
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125 * @param m21 the first element of the second row of the matrix
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126 * @param m22 the second element of the second row of the matrix
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127 * @param dx the third element of the first row of the matrix
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128 * @param dy the third element of the second row of the matrix
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129 *
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130 * @exception IllegalArgumentException <ul>
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131 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
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132 * </ul>
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133 * @exception SWTException <ul>
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134 * <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
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135 * </ul>
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136 * @exception SWTError <ul>
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137 * <li>ERROR_NO_HANDLES if a handle for the Transform could not be obtained</li>
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138 * </ul>
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139 *
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140 * @see #dispose()
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141 */
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142 public this (Device device, float m11, float m12, float m21, float m22, float dx, float dy) {
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143 super(device);
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144 this.device.checkGDIP();
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145 handle = Gdip.Matrix_new(m11, m12, m21, m22, dx, dy);
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146 if (handle is null) SWT.error(SWT.ERROR_NO_HANDLES);
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147 init_();
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148 }
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149
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150 static float[] checkTransform(float[] elements) {
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151 if (elements is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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152 if (elements.length < 6) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
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153 return elements;
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154 }
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155
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156 void destroy() {
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157 Gdip.Matrix_delete(handle);
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158 handle = null;
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159 }
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160
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161 /**
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162 * Fills the parameter with the values of the transformation matrix
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163 * that the receiver represents, in the order {m11, m12, m21, m22, dx, dy}.
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164 *
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165 * @param elements array to hold the matrix values
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166 *
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167 * @exception SWTException <ul>
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168 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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169 * </ul>
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170 * @exception IllegalArgumentException <ul>
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171 * <li>ERROR_NULL_ARGUMENT - if the parameter is null</li>
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172 * <li>ERROR_INVALID_ARGUMENT - if the parameter is too small to hold the matrix values</li>
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173 * </ul>
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174 */
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175 public void getElements(float[] elements) {
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176 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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177 if (elements is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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178 if (elements.length < 6) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
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179 Gdip.Matrix_GetElements(handle, elements.ptr);
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180 }
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181
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182 /**
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183 * Modifies the receiver such that the matrix it represents becomes the
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184 * identity matrix.
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185 *
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186 * @exception SWTException <ul>
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187 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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188 * </ul>
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189 *
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190 * @since 3.4
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191 */
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192 public void identity() {
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193 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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194 Gdip.Matrix_SetElements(handle, 1, 0, 0, 1, 0, 0);
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195 }
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196
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197 /**
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198 * Modifies the receiver such that the matrix it represents becomes
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199 * the mathematical inverse of the matrix it previously represented.
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200 *
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201 * @exception SWTException <ul>
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202 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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203 * <li>ERROR_CANNOT_INVERT_MATRIX - if the matrix is not invertible</li>
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204 * </ul>
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205 */
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206 public void invert() {
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207 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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208 if (Gdip.Matrix_Invert(handle) !is 0) SWT.error(SWT.ERROR_CANNOT_INVERT_MATRIX);
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209 }
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210
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211 /**
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212 * Returns <code>true</code> if the Transform has been disposed,
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213 * and <code>false</code> otherwise.
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214 * <p>
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215 * This method gets the dispose state for the Transform.
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216 * When a Transform has been disposed, it is an error to
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217 * invoke any other method using the Transform.
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218 *
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219 * @return <code>true</code> when the Transform is disposed, and <code>false</code> otherwise
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220 */
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221 override public bool isDisposed() {
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222 return handle is null;
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223 }
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224
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225 /**
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226 * Returns <code>true</code> if the Transform represents the identity matrix
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227 * and false otherwise.
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228 *
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229 * @return <code>true</code> if the receiver is an identity Transform, and <code>false</code> otherwise
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230 */
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231 public bool isIdentity() {
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232 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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233 return cast(bool) Gdip.Matrix_IsIdentity(handle);
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234 }
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235
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236 /**
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237 * Modifies the receiver such that the matrix it represents becomes the
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238 * the result of multiplying the matrix it previously represented by the
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239 * argument.
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240 *
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241 * @param matrix the matrix to multiply the receiver by
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242 *
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243 * @exception SWTException <ul>
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244 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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245 * </ul>
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246 * @exception IllegalArgumentException <ul>
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247 * <li>ERROR_NULL_ARGUMENT - if the parameter is null</li>
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248 * <li>ERROR_INVALID_ARGUMENT - if the parameter has been disposed</li>
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249 * </ul>
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250 */
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251 public void multiply(Transform matrix) {
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252 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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253 if (matrix is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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254 if (matrix.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
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255 Gdip.Matrix_Multiply(handle, matrix.handle, Gdip.MatrixOrderPrepend);
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256 }
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257
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258 /**
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259 * Modifies the receiver so that it represents a transformation that is
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260 * equivalent to its previous transformation rotated by the specified angle.
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261 * The angle is specified in degrees and for the identity transform 0 degrees
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262 * is at the 3 o'clock position. A positive value indicates a clockwise rotation
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263 * while a negative value indicates a counter-clockwise rotation.
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264 *
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265 * @param angle the angle to rotate the transformation by
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266 *
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267 * @exception SWTException <ul>
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268 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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269 * </ul>
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270 */
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271 public void rotate(float angle) {
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272 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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273 Gdip.Matrix_Rotate(handle, angle, Gdip.MatrixOrderPrepend);
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274 }
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275
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276 /**
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277 * Modifies the receiver so that it represents a transformation that is
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278 * equivalent to its previous transformation scaled by (scaleX, scaleY).
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279 *
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280 * @param scaleX the amount to scale in the X direction
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281 * @param scaleY the amount to scale in the Y direction
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282 *
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283 * @exception SWTException <ul>
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284 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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285 * </ul>
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286 */
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287 public void scale(float scaleX, float scaleY) {
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288 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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289 Gdip.Matrix_Scale(handle, scaleX, scaleY, Gdip.MatrixOrderPrepend);
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290 }
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291
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292 /**
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293 * Modifies the receiver to represent a new transformation given all of
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294 * the elements that represent the matrix that describes that transformation.
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295 *
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296 * @param m11 the first element of the first row of the matrix
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297 * @param m12 the second element of the first row of the matrix
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298 * @param m21 the first element of the second row of the matrix
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299 * @param m22 the second element of the second row of the matrix
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300 * @param dx the third element of the first row of the matrix
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301 * @param dy the third element of the second row of the matrix
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302 *
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303 * @exception SWTException <ul>
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304 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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305 * </ul>
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306 */
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307 public void setElements(float m11, float m12, float m21, float m22, float dx, float dy) {
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308 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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309 Gdip.Matrix_SetElements(handle, m11, m12, m21, m22, dx, dy);
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310 }
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311
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312 /**
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313 * Modifies the receiver so that it represents a transformation that is
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314 * equivalent to its previous transformation sheared by (shearX, shearY).
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315 *
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316 * @param shearX the shear factor in the X direction
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317 * @param shearY the shear factor in the Y direction
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318 *
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319 * @exception SWTException <ul>
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320 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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321 * </ul>
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322 *
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323 * @since 3.4
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324 */
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325 public void shear(float shearX, float shearY) {
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326 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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327 Gdip.Matrix_Shear(handle, shearX, shearY, Gdip.MatrixOrderPrepend);
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328 }
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329
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330 /**
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331 * Given an array containing points described by alternating x and y values,
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332 * modify that array such that each point has been replaced with the result of
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333 * applying the transformation represented by the receiver to that point.
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334 *
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335 * @param pointArray an array of alternating x and y values to be transformed
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336 *
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337 * @exception IllegalArgumentException <ul>
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338 * <li>ERROR_NULL_ARGUMENT - if the point array is null</li>
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339 * </ul>
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340 * @exception SWTException <ul>
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341 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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342 * </ul>
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343 */
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344 public void transform(float[] pointArray) {
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345 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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346 if (pointArray is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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347 Gdip.Matrix_TransformPoints(handle, cast(Gdip.PointF*)pointArray.ptr, pointArray.length / 2);
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348 }
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349
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350 /**
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351 * Modifies the receiver so that it represents a transformation that is
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352 * equivalent to its previous transformation translated by (offsetX, offsetY).
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353 *
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354 * @param offsetX the distance to translate in the X direction
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355 * @param offsetY the distance to translate in the Y direction
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356 *
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357 * @exception SWTException <ul>
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358 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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359 * </ul>
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360 */
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361 public void translate(float offsetX, float offsetY) {
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362 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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363 Gdip.Matrix_Translate(handle, offsetX, offsetY, Gdip.MatrixOrderPrepend);
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364 }
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365
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366 /**
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367 * Returns a string containing a concise, human-readable
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368 * description of the receiver.
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369 *
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370 * @return a string representation of the receiver
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371 */
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372 override public String toString() {
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373 if (isDisposed()) return "Transform {*DISPOSED*}";
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374 float[6] elements;
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375 getElements(elements);
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376 return Format("Transform {{{},{},{},{},{}}", elements [0], elements [1], elements [2], elements [3], elements [4], elements [5] );
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377 }
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378
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379 }