Mercurial > projects > dwt-linux
annotate dwt/graphics/Transform.d @ 259:c0d810de7093
Update SWT 3.4M7 to 3.4
| author | Frank Benoit <benoit@tionex.de> |
|---|---|
| date | Sun, 29 Jun 2008 14:33:38 +0200 |
| parents | ce446666f5a2 |
| children |
| rev | line source |
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| 72 | 1 /******************************************************************************* |
| 259 | 2 * Copyright (c) 2000, 2008 IBM Corporation and others. |
| 23 | 3 * All rights reserved. This program and the accompanying materials |
| 4 * are made available under the terms of the Eclipse Public License v1.0 | |
| 5 * which accompanies this distribution, and is available at | |
| 6 * http://www.eclipse.org/legal/epl-v10.html | |
| 7 * | |
| 8 * Contributors: | |
| 9 * IBM Corporation - initial API and implementation | |
| 72 | 10 * Port to the D programming language: |
| 11 * Frank Benoit <benoit@tionex.de> | |
| 23 | 12 *******************************************************************************/ |
| 13 module dwt.graphics.Transform; | |
| 14 | |
| 238 | 15 import dwt.dwthelper.utils; |
| 16 | |
| 71 | 17 import dwt.DWT; |
| 23 | 18 import dwt.internal.Compatibility; |
| 19 import dwt.internal.cairo.Cairo; | |
| 20 import dwt.graphics.Resource; | |
| 21 import dwt.graphics.Device; | |
| 22 | |
| 23 import tango.text.convert.Format; | |
| 24 | |
| 25 /** | |
| 26 * Instances of this class represent transformation matrices for | |
| 27 * points expressed as (x, y) pairs of floating point numbers. | |
| 28 * <p> | |
| 29 * Application code must explicitly invoke the <code>Transform.dispose()</code> | |
| 30 * method to release the operating system resources managed by each instance | |
| 31 * when those instances are no longer required. | |
| 32 * </p> | |
| 33 * <p> | |
| 34 * This class requires the operating system's advanced graphics subsystem | |
| 35 * which may not be available on some platforms. | |
| 36 * </p> | |
| 37 * | |
| 259 | 38 * @see <a href="http://www.eclipse.org/swt/examples.php">DWT Example: GraphicsExample</a> |
| 39 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> | |
| 40 * | |
| 23 | 41 * @since 3.1 |
| 42 */ | |
| 43 public class Transform : Resource { | |
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44 /** |
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45 * the OS resource for the Transform |
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46 * (Warning: This field is platform dependent) |
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47 * <p> |
| 71 | 48 * <b>IMPORTANT:</b> This field is <em>not</em> part of the DWT |
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49 * public API. It is marked public only so that it can be shared |
| 71 | 50 * within the packages provided by DWT. It is not available on all |
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51 * platforms and should never be accessed from application code. |
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52 * </p> |
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53 */ |
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54 public double[] handle; |
| 23 | 55 |
| 56 /** | |
| 57 * Constructs a new identity Transform. | |
| 58 * <p> | |
| 59 * This operation requires the operating system's advanced | |
| 60 * graphics subsystem which may not be available on some | |
| 61 * platforms. | |
| 62 * </p> | |
| 63 * | |
| 64 * @param device the device on which to allocate the Transform | |
| 65 * | |
| 66 * @exception IllegalArgumentException <ul> | |
| 67 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li> | |
| 68 * </ul> | |
| 71 | 69 * @exception DWTException <ul> |
| 23 | 70 * <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li> |
| 71 * </ul> | |
| 71 | 72 * @exception DWTError <ul> |
| 23 | 73 * <li>ERROR_NO_HANDLES if a handle for the Transform could not be obtained</li> |
| 74 * </ul> | |
| 75 * | |
| 76 * @see #dispose() | |
| 77 */ | |
| 78 public this (Device device) { | |
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79 this(device, 1, 0, 0, 1, 0, 0); |
| 23 | 80 } |
| 81 | |
| 82 /** | |
| 83 * Constructs a new Transform given an array of elements that represent the | |
| 84 * matrix that describes the transformation. | |
| 85 * <p> | |
| 86 * This operation requires the operating system's advanced | |
| 87 * graphics subsystem which may not be available on some | |
| 88 * platforms. | |
| 89 * </p> | |
| 90 * | |
| 91 * @param device the device on which to allocate the Transform | |
| 92 * @param elements an array of floats that describe the transformation matrix | |
| 93 * | |
| 94 * @exception IllegalArgumentException <ul> | |
| 95 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device, or the elements array is null</li> | |
| 96 * <li>ERROR_INVALID_ARGUMENT - if the elements array is too small to hold the matrix values</li> | |
| 97 * </ul> | |
| 71 | 98 * @exception DWTException <ul> |
| 23 | 99 * <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li> |
| 100 * </ul> | |
| 71 | 101 * @exception DWTError <ul> |
| 23 | 102 * <li>ERROR_NO_HANDLES if a handle for the Transform could not be obtained</li> |
| 103 * </ul> | |
| 104 * | |
| 105 * @see #dispose() | |
| 106 */ | |
| 107 public this(Device device, float[] elements) { | |
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108 this (device, checkTransform(elements)[0], elements[1], elements[2], elements[3], elements[4], elements[5]); |
| 23 | 109 } |
| 110 | |
| 111 /** | |
| 112 * Constructs a new Transform given all of the elements that represent the | |
| 113 * matrix that describes the transformation. | |
| 114 * <p> | |
| 115 * This operation requires the operating system's advanced | |
| 116 * graphics subsystem which may not be available on some | |
| 117 * platforms. | |
| 118 * </p> | |
| 119 * | |
| 120 * @param device the device on which to allocate the Transform | |
| 121 * @param m11 the first element of the first row of the matrix | |
| 122 * @param m12 the second element of the first row of the matrix | |
| 123 * @param m21 the first element of the second row of the matrix | |
| 124 * @param m22 the second element of the second row of the matrix | |
| 125 * @param dx the third element of the first row of the matrix | |
| 126 * @param dy the third element of the second row of the matrix | |
| 127 * | |
| 128 * @exception IllegalArgumentException <ul> | |
| 129 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li> | |
| 130 * </ul> | |
| 71 | 131 * @exception DWTException <ul> |
| 23 | 132 * <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li> |
| 133 * </ul> | |
| 71 | 134 * @exception DWTError <ul> |
| 23 | 135 * <li>ERROR_NO_HANDLES if a handle for the Transform could not be obtained</li> |
| 136 * </ul> | |
| 137 * | |
| 138 * @see #dispose() | |
| 139 */ | |
| 140 public this (Device device, float m11, float m12, float m21, float m22, float dx, float dy) { | |
| 240 | 141 super(device); |
| 142 this.device.checkCairo(); | |
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143 handle = new double[6]; |
| 71 | 144 if (handle is null) DWT.error(DWT.ERROR_NO_HANDLES); |
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145 Cairo.cairo_matrix_init( cast(cairo_matrix_t*)handle.ptr, m11, m12, m21, m22, dx, dy); |
| 240 | 146 init_(); |
| 23 | 147 } |
| 148 | |
| 149 static float[] checkTransform(float[] elements) { | |
| 194 | 150 if (elements is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
| 71 | 151 if (elements.length < 6) DWT.error(DWT.ERROR_INVALID_ARGUMENT); |
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152 return elements; |
| 23 | 153 } |
| 154 | |
| 240 | 155 void destroy() { |
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156 handle = null; |
| 23 | 157 } |
| 158 | |
| 159 /** | |
| 160 * Fills the parameter with the values of the transformation matrix | |
| 161 * that the receiver represents, in the order {m11, m12, m21, m22, dx, dy}. | |
| 162 * | |
| 163 * @param elements array to hold the matrix values | |
| 164 * | |
| 71 | 165 * @exception DWTException <ul> |
| 23 | 166 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| 167 * </ul> | |
| 168 * @exception IllegalArgumentException <ul> | |
| 169 * <li>ERROR_NULL_ARGUMENT - if the parameter is null</li> | |
| 170 * <li>ERROR_INVALID_ARGUMENT - if the parameter is too small to hold the matrix values</li> | |
| 171 * </ul> | |
| 172 */ | |
| 173 public void getElements(float[] elements) { | |
| 71 | 174 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
| 175 if (elements is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); | |
| 176 if (elements.length < 6) DWT.error(DWT.ERROR_INVALID_ARGUMENT); | |
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177 elements[0] = cast(float)handle[0]; |
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178 elements[1] = cast(float)handle[1]; |
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179 elements[2] = cast(float)handle[2]; |
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180 elements[3] = cast(float)handle[3]; |
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181 elements[4] = cast(float)handle[4]; |
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182 elements[5] = cast(float)handle[5]; |
| 23 | 183 } |
| 184 | |
| 259 | 185 /** |
| 186 * Modifies the receiver such that the matrix it represents becomes the | |
| 187 * identity matrix. | |
| 188 * | |
| 189 * @exception DWTException <ul> | |
| 190 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> | |
| 191 * </ul> | |
| 192 * | |
| 193 * @since 3.4 | |
| 194 */ | |
| 240 | 195 public void identity() { |
| 196 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); | |
| 197 Cairo.cairo_matrix_init(cast(cairo_matrix_t*)handle.ptr, 1, 0, 0, 1, 0, 0); | |
| 198 } | |
| 199 | |
| 23 | 200 /** |
| 259 | 201 * Modifies the receiver such that the matrix it represents becomes |
| 23 | 202 * the mathematical inverse of the matrix it previously represented. |
| 203 * | |
| 71 | 204 * @exception DWTException <ul> |
| 23 | 205 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| 206 * <li>ERROR_CANNOT_INVERT_MATRIX - if the matrix is not invertible</li> | |
| 207 * </ul> | |
| 208 */ | |
| 209 public void invert() { | |
| 71 | 210 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
| 194 | 211 if (Cairo.cairo_matrix_invert(cast(cairo_matrix_t*)handle.ptr) !is 0) { |
| 71 | 212 DWT.error(DWT.ERROR_CANNOT_INVERT_MATRIX); |
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213 } |
| 23 | 214 } |
| 215 | |
| 216 /** | |
| 217 * Returns <code>true</code> if the Transform has been disposed, | |
| 218 * and <code>false</code> otherwise. | |
| 219 * <p> | |
| 220 * This method gets the dispose state for the Transform. | |
| 221 * When a Transform has been disposed, it is an error to | |
| 222 * invoke any other method using the Transform. | |
| 223 * | |
| 224 * @return <code>true</code> when the Transform is disposed, and <code>false</code> otherwise | |
| 225 */ | |
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226 public override bool isDisposed() { |
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227 return handle is null; |
| 23 | 228 } |
| 229 | |
| 230 /** | |
| 231 * Returns <code>true</code> if the Transform represents the identity matrix | |
| 232 * and false otherwise. | |
| 233 * | |
| 234 * @return <code>true</code> if the receiver is an identity Transform, and <code>false</code> otherwise | |
| 235 */ | |
| 236 public bool isIdentity() { | |
| 71 | 237 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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238 float[] m = new float[6]; |
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239 getElements(m); |
| 194 | 240 return m[0] is 1 && m[1] is 0 && m[2] is 0 && m[3] is 1 && m[4] is 0 && m[5] is 0; |
| 23 | 241 } |
| 242 | |
| 243 /** | |
| 244 * Modifies the receiver such that the matrix it represents becomes the | |
| 245 * the result of multiplying the matrix it previously represented by the | |
| 246 * argument. | |
| 247 * | |
| 248 * @param matrix the matrix to multiply the receiver by | |
| 249 * | |
| 71 | 250 * @exception DWTException <ul> |
| 23 | 251 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| 252 * </ul> | |
| 253 * @exception IllegalArgumentException <ul> | |
| 254 * <li>ERROR_NULL_ARGUMENT - if the parameter is null</li> | |
| 255 * <li>ERROR_INVALID_ARGUMENT - if the parameter has been disposed</li> | |
| 256 * </ul> | |
| 257 */ | |
| 258 public void multiply(Transform matrix) { | |
| 71 | 259 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
| 194 | 260 if (matrix is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
| 71 | 261 if (matrix.isDisposed()) DWT.error(DWT.ERROR_INVALID_ARGUMENT); |
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262 Cairo.cairo_matrix_multiply(cast(cairo_matrix_t*)handle.ptr,cast(cairo_matrix_t*)matrix.handle.ptr, cast(cairo_matrix_t*)handle.ptr); |
| 23 | 263 } |
| 264 | |
| 265 /** | |
| 266 * Modifies the receiver so that it represents a transformation that is | |
| 267 * equivalent to its previous transformation rotated by the specified angle. | |
| 268 * The angle is specified in degrees and for the identity transform 0 degrees | |
| 269 * is at the 3 o'clock position. A positive value indicates a clockwise rotation | |
| 270 * while a negative value indicates a counter-clockwise rotation. | |
| 271 * | |
| 272 * @param angle the angle to rotate the transformation by | |
| 273 * | |
| 71 | 274 * @exception DWTException <ul> |
| 23 | 275 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| 276 * </ul> | |
| 277 */ | |
| 278 public void rotate(float angle) { | |
| 71 | 279 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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280 Cairo.cairo_matrix_rotate(cast(cairo_matrix_t*)handle.ptr, angle * cast(float)Compatibility.PI / 180); |
| 23 | 281 } |
| 282 | |
| 283 /** | |
| 284 * Modifies the receiver so that it represents a transformation that is | |
| 285 * equivalent to its previous transformation scaled by (scaleX, scaleY). | |
| 286 * | |
| 287 * @param scaleX the amount to scale in the X direction | |
| 288 * @param scaleY the amount to scale in the Y direction | |
| 289 * | |
| 71 | 290 * @exception DWTException <ul> |
| 23 | 291 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| 292 * </ul> | |
| 293 */ | |
| 294 public void scale(float scaleX, float scaleY) { | |
| 71 | 295 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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296 Cairo.cairo_matrix_scale(cast(cairo_matrix_t*)handle.ptr, scaleX, scaleY); |
| 23 | 297 } |
| 298 | |
| 299 /** | |
| 300 * Modifies the receiver to represent a new transformation given all of | |
| 301 * the elements that represent the matrix that describes that transformation. | |
| 302 * | |
| 303 * @param m11 the first element of the first row of the matrix | |
| 304 * @param m12 the second element of the first row of the matrix | |
| 305 * @param m21 the first element of the second row of the matrix | |
| 306 * @param m22 the second element of the second row of the matrix | |
| 307 * @param dx the third element of the first row of the matrix | |
| 308 * @param dy the third element of the second row of the matrix | |
| 309 * | |
| 71 | 310 * @exception DWTException <ul> |
| 23 | 311 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| 312 * </ul> | |
| 313 */ | |
| 314 public void setElements(float m11, float m12, float m21, float m22, float dx, float dy) { | |
| 71 | 315 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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316 Cairo.cairo_matrix_init(cast(cairo_matrix_t*)handle.ptr, m11, m12, m21, m22, dx, dy); |
| 23 | 317 } |
| 318 | |
| 259 | 319 /** |
| 320 * Modifies the receiver so that it represents a transformation that is | |
| 321 * equivalent to its previous transformation sheared by (shearX, shearY). | |
| 322 * | |
| 323 * @param shearX the shear factor in the X direction | |
| 324 * @param shearY the shear factor in the Y direction | |
| 325 * | |
| 326 * @exception DWTException <ul> | |
| 327 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> | |
| 328 * </ul> | |
| 329 * | |
| 330 * @since 3.4 | |
| 331 */ | |
| 240 | 332 public void shear(float shearX, float shearY) { |
| 333 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); | |
| 334 double[] matrix = [ 1.0, shearX, shearY, 1, 0, 0]; | |
| 335 Cairo.cairo_matrix_multiply(cast(cairo_matrix_t*)handle.ptr, cast(cairo_matrix_t*)matrix.ptr, cast(cairo_matrix_t*)handle.ptr); | |
| 336 } | |
| 337 | |
| 23 | 338 /** |
| 339 * Given an array containing points described by alternating x and y values, | |
| 340 * modify that array such that each point has been replaced with the result of | |
| 341 * applying the transformation represented by the receiver to that point. | |
| 342 * | |
| 343 * @param pointArray an array of alternating x and y values to be transformed | |
| 344 * | |
| 345 * @exception IllegalArgumentException <ul> | |
| 346 * <li>ERROR_NULL_ARGUMENT - if the point array is null</li> | |
| 347 * </ul> | |
| 71 | 348 * @exception DWTException <ul> |
| 23 | 349 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| 350 * </ul> | |
| 351 */ | |
| 352 public void transform(float[] pointArray) { | |
| 71 | 353 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
| 194 | 354 if (pointArray is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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355 double dx, dy; |
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356 int length = pointArray.length / 2; |
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357 for (int i = 0, j = 0; i < length; i++, j += 2) { |
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358 dx = pointArray[j]; |
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All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
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changeset
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359 dy = pointArray[j + 1]; |
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8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
33
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changeset
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360 Cairo.cairo_matrix_transform_point(cast(cairo_matrix_t*)handle.ptr, &dx, &dy); |
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8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
33
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changeset
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361 pointArray[j] = cast(float)dx; |
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8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
33
diff
changeset
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362 pointArray[j + 1] = cast(float)dy; |
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8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
33
diff
changeset
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363 } |
| 23 | 364 } |
| 365 | |
| 366 /** | |
| 367 * Modifies the receiver so that it represents a transformation that is | |
| 368 * equivalent to its previous transformation translated by (offsetX, offsetY). | |
| 369 * | |
| 370 * @param offsetX the distance to translate in the X direction | |
| 371 * @param offsetY the distance to translate in the Y direction | |
| 372 * | |
| 71 | 373 * @exception DWTException <ul> |
| 23 | 374 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| 375 * </ul> | |
| 376 */ | |
| 377 public void translate(float offsetX, float offsetY) { | |
| 71 | 378 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
33
diff
changeset
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379 Cairo.cairo_matrix_translate(cast(cairo_matrix_t*)handle.ptr, offsetX, offsetY); |
| 23 | 380 } |
| 381 | |
| 382 /** | |
| 383 * Returns a string containing a concise, human-readable | |
| 384 * description of the receiver. | |
| 385 * | |
| 386 * @return a string representation of the receiver | |
| 387 */ | |
| 238 | 388 public override String toString() { |
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All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
33
diff
changeset
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389 if (isDisposed()) return "Transform {*DISPOSED*}"; |
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8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
33
diff
changeset
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390 float[] elements = new float[6]; |
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8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
33
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changeset
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391 getElements(elements); |
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8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
33
diff
changeset
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392 return Format( "Transform {{{}}", elements ); |
| 23 | 393 } |
| 394 | |
| 395 } |