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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.SWT;
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14 import dwt.internal.Compatibility;
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15 import dwt.internal.cairo.Cairo;
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16 import dwt.internal.gtk.c.cairotypes;
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17 import dwt.graphics.Resource;
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18 import dwt.graphics.Device;
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19
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20 import tango.text.convert.Format;
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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 */
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37 public class Transform : Resource {
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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 SWT
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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 SWT. 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 double[] 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 SWTException <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 SWTError <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 this (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 SWTException <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 SWTError <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 this(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 SWTException <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 SWTError <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 this (Device device, float m11, float m12, float m21, float m22, float dx, float dy) {
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135 if (device is null) device = Device.getDevice();
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136 if (device is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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137 this.device = device;
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138 device.checkCairo();
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139 handle = new double[6];
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140 if (handle is null) SWT.error(SWT.ERROR_NO_HANDLES);
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141 Cairo.cairo_matrix_init( cast(cairo_matrix_t*)handle.ptr, m11, m12, m21, m22, dx, dy);
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142 if (device.tracking) device.new_Object(this);
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143 }
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144
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145 static float[] checkTransform(float[] elements) {
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146 if (elements == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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147 if (elements.length < 6) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
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148 return elements;
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149 }
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150
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151 /**
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152 * Disposes of the operating system resources associated with
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153 * the Transform. Applications must dispose of all Transforms that
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154 * they allocate.
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155 */
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156 public void dispose() {
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157 if (handle is null) return;
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158 if (device.isDisposed()) return;
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159 handle = null;
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160 if (device.tracking) device.dispose_Object(this);
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161 device = null;
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162 }
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163
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164 /**
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165 * Fills the parameter with the values of the transformation matrix
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166 * that the receiver represents, in the order {m11, m12, m21, m22, dx, dy}.
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167 *
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168 * @param elements array to hold the matrix values
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169 *
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170 * @exception SWTException <ul>
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171 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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172 * </ul>
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173 * @exception IllegalArgumentException <ul>
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174 * <li>ERROR_NULL_ARGUMENT - if the parameter is null</li>
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175 * <li>ERROR_INVALID_ARGUMENT - if the parameter is too small to hold the matrix values</li>
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176 * </ul>
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177 */
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178 public void getElements(float[] elements) {
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179 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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180 if (elements is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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181 if (elements.length < 6) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
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182 elements[0] = cast(float)handle[0];
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183 elements[1] = cast(float)handle[1];
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184 elements[2] = cast(float)handle[2];
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185 elements[3] = cast(float)handle[3];
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186 elements[4] = cast(float)handle[4];
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187 elements[5] = cast(float)handle[5];
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188 }
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189
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190 /**
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191 * Modifies the receiver such that the matrix it represents becomes the
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192 * the mathematical inverse of the matrix it previously represented.
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193 *
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194 * @exception SWTException <ul>
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195 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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196 * <li>ERROR_CANNOT_INVERT_MATRIX - if the matrix is not invertible</li>
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197 * </ul>
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198 */
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199 public void invert() {
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200 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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201 if (Cairo.cairo_matrix_invert(cast(cairo_matrix_t*)handle.ptr) != 0) {
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202 SWT.error(SWT.ERROR_CANNOT_INVERT_MATRIX);
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203 }
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204 }
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205
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206 /**
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207 * Returns <code>true</code> if the Transform has been disposed,
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208 * and <code>false</code> otherwise.
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209 * <p>
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210 * This method gets the dispose state for the Transform.
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211 * When a Transform has been disposed, it is an error to
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212 * invoke any other method using the Transform.
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213 *
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214 * @return <code>true</code> when the Transform is disposed, and <code>false</code> otherwise
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215 */
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216 public bool isDisposed() {
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217 return handle is null;
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218 }
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219
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220 /**
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221 * Returns <code>true</code> if the Transform represents the identity matrix
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222 * and false otherwise.
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223 *
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224 * @return <code>true</code> if the receiver is an identity Transform, and <code>false</code> otherwise
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225 */
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226 public bool isIdentity() {
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227 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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228 float[] m = new float[6];
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229 getElements(m);
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230 return m[0] == 1 && m[1] == 0 && m[2] == 0 && m[3] == 1 && m[4] == 0 && m[5] == 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 SWTException <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()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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250 if (matrix == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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251 if (matrix.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
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252 Cairo.cairo_matrix_multiply(cast(cairo_matrix_t*)handle.ptr,cast(cairo_matrix_t*)matrix.handle.ptr, cast(cairo_matrix_t*)handle.ptr);
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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 SWTException <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()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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270 Cairo.cairo_matrix_rotate(cast(cairo_matrix_t*)handle.ptr, angle * cast(float)Compatibility.PI / 180);
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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 SWTException <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()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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286 Cairo.cairo_matrix_scale(cast(cairo_matrix_t*)handle.ptr, 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 SWTException <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()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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306 Cairo.cairo_matrix_init(cast(cairo_matrix_t*)handle.ptr, m11, m12, m21, m22, dx, dy);
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307 }
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308
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309 /**
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310 * Given an array containing points described by alternating x and y values,
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311 * modify that array such that each point has been replaced with the result of
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312 * applying the transformation represented by the receiver to that point.
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313 *
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314 * @param pointArray an array of alternating x and y values to be transformed
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315 *
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316 * @exception IllegalArgumentException <ul>
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317 * <li>ERROR_NULL_ARGUMENT - if the point array is null</li>
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318 * </ul>
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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 public void transform(float[] pointArray) {
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324 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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325 if (pointArray == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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326 double dx, dy;
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327 int length = pointArray.length / 2;
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328 for (int i = 0, j = 0; i < length; i++, j += 2) {
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329 dx = pointArray[j];
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330 dy = pointArray[j + 1];
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331 Cairo.cairo_matrix_transform_point(cast(cairo_matrix_t*)handle.ptr, &dx, &dy);
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332 pointArray[j] = cast(float)dx;
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333 pointArray[j + 1] = cast(float)dy;
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334 }
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335 }
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336
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337 /**
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338 * Modifies the receiver so that it represents a transformation that is
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339 * equivalent to its previous transformation translated by (offsetX, offsetY).
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340 *
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341 * @param offsetX the distance to translate in the X direction
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342 * @param offsetY the distance to translate in the Y direction
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343 *
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344 * @exception SWTException <ul>
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345 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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346 * </ul>
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347 */
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348 public void translate(float offsetX, float offsetY) {
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349 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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350 Cairo.cairo_matrix_translate(cast(cairo_matrix_t*)handle.ptr, offsetX, offsetY);
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351 }
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352
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353 /**
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354 * Returns a string containing a concise, human-readable
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355 * description of the receiver.
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356 *
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357 * @return a string representation of the receiver
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358 */
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359 public char[] toString() {
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360 if (isDisposed()) return "Transform {*DISPOSED*}";
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361 float[] elements = new float[6];
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362 getElements(elements);
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363 return Format( "Transform {{{}}", elements );
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364 }
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365
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366 }
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