| 1 | '\" |
| 2 | '\" Copyright (c) 1994 The Regents of the University of California. |
| 3 | '\" Copyright (c) 1994-1996 Sun Microsystems, Inc. |
| 4 | '\" |
| 5 | '\" See the file "license.terms" for information on usage and redistribution |
| 6 | '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
| 7 | '\" |
| 8 | '\" RCS: @(#) $Id: GetImage.3,v 1.5 2002/08/05 04:30:38 dgp Exp $ |
| 9 | '\" |
| 10 | '\" The definitions below are for supplemental macros used in Tcl/Tk |
| 11 | '\" manual entries. |
| 12 | '\" |
| 13 | '\" .AP type name in/out ?indent? |
| 14 | '\" Start paragraph describing an argument to a library procedure. |
| 15 | '\" type is type of argument (int, etc.), in/out is either "in", "out", |
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| 20 | '\" .AS ?type? ?name? |
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| 32 | '\" .CS |
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| 38 | '\" .VS ?version? ?br? |
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| 40 | '\" of man pages. The first argument is ignored and used for recording |
| 41 | '\" the version when the .VS was added, so that the sidebars can be |
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| 54 | '\" .SO |
| 55 | '\" Start of list of standard options for a Tk widget. The |
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| 58 | '\" |
| 59 | '\" .SE |
| 60 | '\" End of list of standard options for a Tk widget. |
| 61 | '\" |
| 62 | '\" .OP cmdName dbName dbClass |
| 63 | '\" Start of description of a specific option. cmdName gives the |
| 64 | '\" option's name as specified in the class command, dbName gives |
| 65 | '\" the option's name in the option database, and dbClass gives |
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| 71 | '\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $ |
| 72 | '\" |
| 73 | '\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages. |
| 74 | .if t .wh -1.3i ^B |
| 75 | .nr ^l \n(.l |
| 76 | .ad b |
| 77 | '\" # Start an argument description |
| 78 | .de AP |
| 79 | .ie !"\\$4"" .TP \\$4 |
| 80 | .el \{\ |
| 81 | . ie !"\\$2"" .TP \\n()Cu |
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| 85 | .ie !"\\$3"" \{\ |
| 86 | \&\\$1 \\fI\\$2\\fP (\\$3) |
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| 91 | .ie !"\\$2"" \{\ |
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| 108 | .AS Tcl_Interp Tcl_CreateInterp in/out |
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| 134 | \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul' |
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| 177 | .el \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c |
| 178 | .\} |
| 179 | .if \\n(^v \{\ |
| 180 | .nr ^x \\n(^tu+1v-\\n(^Yu |
| 181 | \kx\h'-\\nxu'\h'|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'|0u'\c |
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| 206 | '\" # SO - start of list of standard options |
| 207 | .de SO |
| 208 | .SH "STANDARD OPTIONS" |
| 209 | .LP |
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| 211 | .ta 5.5c 11c |
| 212 | .ft B |
| 213 | .. |
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| 218 | .LP |
| 219 | See the \\fBoptions\\fR manual entry for details on the standard options. |
| 220 | .. |
| 221 | '\" # OP - start of full description for a single option |
| 222 | .de OP |
| 223 | .LP |
| 224 | .nf |
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| 226 | Command-Line Name: \\fB\\$1\\fR |
| 227 | Database Name: \\fB\\$2\\fR |
| 228 | Database Class: \\fB\\$3\\fR |
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| 230 | .IP |
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| 242 | .. |
| 243 | .de UL |
| 244 | \\$1\l'|0\(ul'\\$2 |
| 245 | .. |
| 246 | .TH Tk_GetImage 3 4.0 Tk "Tk Library Procedures" |
| 247 | .BS |
| 248 | .SH NAME |
| 249 | Tk_GetImage, Tk_RedrawImage, Tk_SizeOfImage, Tk_FreeImage \- use an image in a widget |
| 250 | .SH SYNOPSIS |
| 251 | .nf |
| 252 | \fB#include <tk.h>\fR |
| 253 | .sp |
| 254 | Tk_Image |
| 255 | \fBTk_GetImage\fR(\fIinterp, tkwin, name, changeProc, clientData\fR) |
| 256 | .sp |
| 257 | \fBTk_RedrawImage\fR(\fIimage, imageX, imageY, width, height, drawable, drawableX, drawableY\fR) |
| 258 | .sp |
| 259 | \fBTk_SizeOfImage\fR(\fIimage, widthPtr, heightPtr\fR) |
| 260 | .sp |
| 261 | \fBTk_FreeImage\fR(\fIimage\fR) |
| 262 | .SH ARGUMENTS |
| 263 | .AS Tk_ImageChangedProc *changeProc |
| 264 | .AP Tcl_Interp *interp in |
| 265 | Place to leave error message. |
| 266 | .AP Tk_Window tkwin in |
| 267 | Window in which image will be used. |
| 268 | .AP "CONST char" *name in |
| 269 | Name of image. |
| 270 | .AP Tk_ImageChangedProc *changeProc in |
| 271 | Procedure for Tk to invoke whenever image content or size changes. |
| 272 | .AP ClientData clientData in |
| 273 | One-word value for Tk to pass to \fIchangeProc\fR. |
| 274 | .AP Tk_Image image in |
| 275 | Token for image instance; must have been returned by a previous |
| 276 | call to \fBTk_GetImage\fR. |
| 277 | .AP int imageX in |
| 278 | X-coordinate of upper-left corner of region of image to redisplay |
| 279 | (measured in pixels from the image's upper-left corner). |
| 280 | .AP int imageY in |
| 281 | Y-coordinate of upper-left corner of region of image to redisplay |
| 282 | (measured in pixels from the image's upper-left corner). |
| 283 | .AP "int" width (in) |
| 284 | Width of region of image to redisplay. |
| 285 | .AP "int" height (in) |
| 286 | Height of region of image to redisplay. |
| 287 | .AP Drawable drawable in |
| 288 | Where to display image. Must either be window specified to |
| 289 | \fBTk_GetImage\fR or a pixmap compatible with that window. |
| 290 | .AP int drawableX in |
| 291 | Where to display image in \fIdrawable\fR: this is the x-coordinate |
| 292 | in \fIdrawable\fR where x-coordinate \fIimageX\fR of the image |
| 293 | should be displayed. |
| 294 | .AP int drawableY in |
| 295 | Where to display image in \fIdrawable\fR: this is the y-coordinate |
| 296 | in \fIdrawable\fR where y-coordinate \fIimageY\fR of the image |
| 297 | should be displayed. |
| 298 | .AP "int" widthPtr out |
| 299 | Store width of \fIimage\fR (in pixels) here. |
| 300 | .AP "int" heightPtr out |
| 301 | Store height of \fIimage\fR (in pixels) here. |
| 302 | .BE |
| 303 | |
| 304 | .SH DESCRIPTION |
| 305 | .PP |
| 306 | These procedures are invoked by widgets that wish to display images. |
| 307 | \fBTk_GetImage\fR is invoked by a widget when it first decides to |
| 308 | display an image. |
| 309 | \fIname\fR gives the name of the desired image and \fItkwin\fR |
| 310 | identifies the window where the image will be displayed. |
| 311 | \fBTk_GetImage\fR looks up the image in the table of existing |
| 312 | images and returns a token for a new instance of the image. |
| 313 | If the image doesn't exist then \fBTk_GetImage\fR returns NULL |
| 314 | and leaves an error message in \fIinterp->result\fR. |
| 315 | .PP |
| 316 | When a widget wishes to actually display an image it must |
| 317 | call \fBTk_RedrawImage\fR, identifying the image (\fIimage\fR), |
| 318 | a region within the image to redisplay (\fIimageX\fR, \fIimageY\fR, |
| 319 | \fIwidth\fR, and \fIheight\fR), and a place to display the |
| 320 | image (\fIdrawable\fR, \fIdrawableX\fR, and \fIdrawableY\fR). |
| 321 | Tk will then invoke the appropriate image manager, which will |
| 322 | display the requested portion of the image before returning. |
| 323 | .PP |
| 324 | A widget can find out the dimensions of an image by calling |
| 325 | \fBTk_SizeOfImage\fR: the width and height will be stored |
| 326 | in the locations given by \fIwidthPtr\fR and \fIheightPtr\fR, |
| 327 | respectively. |
| 328 | .PP |
| 329 | When a widget is finished with an image (e.g., the widget is |
| 330 | being deleted or it is going to use a different image instead |
| 331 | of the current one), it must call \fBTk_FreeImage\fR to |
| 332 | release the image instance. |
| 333 | The widget should never again use the image token after passing |
| 334 | it to \fBTk_FreeImage\fR. |
| 335 | There must be exactly one call to \fBTk_FreeImage\fR for each |
| 336 | call to \fBTk_GetImage\fR. |
| 337 | .PP |
| 338 | If the contents or size of an image changes, then any widgets |
| 339 | using the image will need to find out about the changes so that |
| 340 | they can redisplay themselves. |
| 341 | The \fIchangeProc\fR and \fIclientData\fR arguments to |
| 342 | \fBTk_GetImage\fR are used for this purpose. |
| 343 | \fIchangeProc\fR will be called by Tk whenever a change occurs |
| 344 | in the image; it must match the following prototype: |
| 345 | .CS |
| 346 | typedef void Tk_ImageChangedProc( |
| 347 | ClientData \fIclientData\fR, |
| 348 | int \fIx\fR, |
| 349 | int \fIy\fR, |
| 350 | int \fIwidth\fR, |
| 351 | int \fIheight\fR, |
| 352 | int \fIimageWidth\fR, |
| 353 | int \fIimageHeight\fR); |
| 354 | .CE |
| 355 | The \fIclientData\fR argument to \fIchangeProc\fR is the same as the |
| 356 | \fIclientData\fR argument to \fBTk_GetImage\fR. |
| 357 | It is usually a pointer to the widget record for the widget or |
| 358 | some other data structure managed by the widget. |
| 359 | The arguments \fIx\fR, \fIy\fR, \fIwidth\fR, and \fIheight\fR |
| 360 | identify a region within the image that must be redisplayed; |
| 361 | they are specified in pixels measured from the upper-left |
| 362 | corner of the image. |
| 363 | The arguments \fIimageWidth\fR and \fIimageHeight\fR give |
| 364 | the image's (new) size. |
| 365 | |
| 366 | .SH "SEE ALSO" |
| 367 | Tk_CreateImageType |
| 368 | |
| 369 | .SH KEYWORDS |
| 370 | images, redisplay |