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| 245 | .. |
| 246 | .TH Tk_GetPixelsFromObj 3 8.1 Tk "Tk Library Procedures" |
| 247 | .BS |
| 248 | .SH NAME |
| 249 | Tk_GetPixelsFromObj, Tk_GetPixels, Tk_GetMMFromObj, Tk_GetScreenMM \- translate between strings and screen units |
| 250 | .SH SYNOPSIS |
| 251 | .nf |
| 252 | \fB#include <tk.h>\fR |
| 253 | .sp |
| 254 | .VS 8.1 |
| 255 | int |
| 256 | \fBTk_GetPixelsFromObj(\fIinterp, tkwin, objPtr, intPtr\fB)\fR |
| 257 | .VE |
| 258 | .sp |
| 259 | int |
| 260 | \fBTk_GetPixels(\fIinterp, tkwin, string, intPtr\fB)\fR |
| 261 | .sp |
| 262 | .VS 8.1 |
| 263 | int |
| 264 | \fBTk_GetMMFromObj(\fIinterp, tkwin, objPtr, doublePtr\fB)\fR |
| 265 | .VE |
| 266 | .sp |
| 267 | int |
| 268 | \fBTk_GetScreenMM(\fIinterp, tkwin, string, doublePtr\fB)\fR |
| 269 | .SH ARGUMENTS |
| 270 | .AS "Tcl_Interp" *joinPtr |
| 271 | .AP Tcl_Interp *interp in |
| 272 | Interpreter to use for error reporting. |
| 273 | .AP Tk_Window tkwin in |
| 274 | Window whose screen geometry determines the conversion between absolute |
| 275 | units and pixels. |
| 276 | .VS 8.1 br |
| 277 | .AP Tcl_Obj *objPtr in/out |
| 278 | String value specifies a distance on the screen; |
| 279 | internal rep will be modified to cache converted distance. |
| 280 | .AP "CONST char" *string in |
| 281 | Same as \fIobjPtr\fR except specification of distance is passed as |
| 282 | a string. |
| 283 | .VE |
| 284 | .AP int *intPtr out |
| 285 | Pointer to location in which to store converted distance in pixels. |
| 286 | .AP double *doublePtr out |
| 287 | Pointer to location in which to store converted distance in millimeters. |
| 288 | .BE |
| 289 | |
| 290 | .SH DESCRIPTION |
| 291 | .PP |
| 292 | These procedures take as argument a specification of distance on |
| 293 | .VS 8.1 |
| 294 | the screen (\fIobjPtr\fR or \fIstring\fR) and compute the |
| 295 | .VE |
| 296 | corresponding distance either in integer pixels or floating-point millimeters. |
| 297 | In either case, |
| 298 | .VS 8.1 |
| 299 | \fIobjPtr\fR or \fIstring\fR |
| 300 | .VE |
| 301 | specifies a screen distance as a |
| 302 | floating-point number followed by one of the following characters |
| 303 | that indicates units: |
| 304 | .TP |
| 305 | <none> |
| 306 | The number specifies a distance in pixels. |
| 307 | .TP |
| 308 | \fBc\fR |
| 309 | The number specifies a distance in centimeters on the screen. |
| 310 | .TP |
| 311 | \fBi\fR |
| 312 | The number specifies a distance in inches on the screen. |
| 313 | .TP |
| 314 | \fBm\fR |
| 315 | The number specifies a distance in millimeters on the screen. |
| 316 | .TP |
| 317 | \fBp\fR |
| 318 | The number specifies a distance in printer's points (1/72 inch) |
| 319 | on the screen. |
| 320 | .PP |
| 321 | .VS 8.1 |
| 322 | \fBTk_GetPixelsFromObj\fR converts the value of \fIobjPtr\fR to the |
| 323 | nearest even number of pixels and stores that value at \fI*intPtr\fR. |
| 324 | It returns \fBTCL_OK\fR under normal circumstances. |
| 325 | If an error occurs (e.g. \fIobjPtr\fR contains a number followed |
| 326 | by a character that isn't one of the ones above) then |
| 327 | \fBTCL_ERROR\fR is returned and an error message is left |
| 328 | in \fIinterp\fR's result if \fIinterp\fR isn't NULL. |
| 329 | \fBTk_GetPixelsFromObj\fR caches information about the return |
| 330 | value in \fIobjPtr\fR, which speeds up future calls to |
| 331 | \fBTk_GetPixelsFromObj\fR with the same \fIobjPtr\fR. |
| 332 | .PP |
| 333 | \fBTk_GetPixels\fR is identical to \fBTk_GetPixelsFromObj\fR except |
| 334 | that the screen distance is specified with a string instead |
| 335 | of an object. This prevents \fBTk_GetPixels\fR from caching the |
| 336 | return value, so \fBTk_GetAnchor\fR is less efficient than |
| 337 | \fBTk_GetPixelsFromObj\fR. |
| 338 | .PP |
| 339 | \fBTk_GetMMFromObj\fR and \fBTk_GetScreenMM\fR are similar to |
| 340 | \fBTk_GetPixelsFromObj\fR and \fBTk_GetPixels\fR (respectively) except |
| 341 | that they convert the screen distance to millimeters and |
| 342 | store a double-precision floating-point result at \fI*doublePtr\fR. |
| 343 | .VE |
| 344 | |
| 345 | .SH KEYWORDS |
| 346 | centimeters, convert, inches, millimeters, pixels, points, screen units |