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| 129 | .\" ======================================================================== |
| 130 | .\" |
| 131 | .IX Title "IMAGE 1" |
| 132 | .TH IMAGE 1 "2000-12-30" "perl v5.8.0" "User Contributed Perl Documentation" |
| 133 | .SH "NAME" |
| 134 | Tk::Image \- Create and manipulate images |
| 135 | .SH "SYNOPSIS" |
| 136 | .IX Header "SYNOPSIS" |
| 137 | \&\fI$image\fR = \fI$widget\fR\->\fItype\fR(?\fIarg arg ...\fR?) |
| 138 | .PP |
| 139 | \&\fI$image\fR\->\fImethod\fR(?\fIarg arg ...\fR?) |
| 140 | .SH "DESCRIPTION" |
| 141 | .IX Header "DESCRIPTION" |
| 142 | The \fBimage\fR constructors and methods are used to create, delete, and query images. |
| 143 | It can take several different forms, depending on the |
| 144 | \&\fItype\fR. |
| 145 | .PP |
| 146 | The constructors require a \fI$widget\fR to invoke them, this is used |
| 147 | to locate a \fBMainWindow\fR. (This is because the underlying Tk code |
| 148 | registers the images in the data structure for the \fBMainWindow\fR.) |
| 149 | .PP |
| 150 | The legal forms are: |
| 151 | .IP "\fI$widget\fR\->\fItype\fR?(?\fIname\fR?,?\fIoption\fR=>\fIvalue ...\fR)?" 4 |
| 152 | .IX Item "$widget->type?(?name?,?option=>value ...)?" |
| 153 | Creates a new image and returns an object. |
| 154 | \&\fItype\fR specifies the type of the image, which must be one of |
| 155 | the types currently defined (e.g., \fBBitmap\fR). |
| 156 | \&\fIname\fR specifies the name for the image; if it is omitted then |
| 157 | Tk picks a name of the form \fBimage\fR\fIx\fR, where \fIx\fR is |
| 158 | an integer. |
| 159 | There may be any number of \fIoption\fR=>\fIvalue\fR pairs, |
| 160 | which provide configuration options for the new image. |
| 161 | The legal set of options is defined separately for each image |
| 162 | type; see below for details on the options for built-in image types. |
| 163 | If an image already exists by the given name then it is replaced |
| 164 | with the new image and any instances of that image will redisplay |
| 165 | with the new contents. |
| 166 | .IP "\fI$image\fR\->\fBdelete\fR" 4 |
| 167 | .IX Item "$image->delete" |
| 168 | Deletes the image \fI$image\fR and returns an empty string. |
| 169 | If there are instances of the image displayed in widgets, |
| 170 | the image won't actually be deleted until all of the instances |
| 171 | are released. |
| 172 | However, the association between the instances and the image |
| 173 | manager will be dropped. |
| 174 | Existing instances will retain their sizes but redisplay as |
| 175 | empty areas. |
| 176 | If a deleted image is recreated (with the same \fIname\fR) |
| 177 | the existing instances will use the new image. |
| 178 | .IP "\fI$image\fR\->\fBheight\fR" 4 |
| 179 | .IX Item "$image->height" |
| 180 | Returns a decimal string giving the height of image \fIname\fR |
| 181 | in pixels. |
| 182 | .IP "\fI$widget\fR\->\fBimageNames\fR" 4 |
| 183 | .IX Item "$widget->imageNames" |
| 184 | Returns a list containing all existing images for \fI$widget\fR's |
| 185 | \&\fBMainWindow\fR. |
| 186 | .IP "\fI$image\fR\->\fBtype\fR" 4 |
| 187 | .IX Item "$image->type" |
| 188 | Returns the type of \fI$image\fR (the value of the \fItype\fR |
| 189 | method when the image was created). |
| 190 | .IP "\fI$widget\fR\->\fBimageTypes\fR" 4 |
| 191 | .IX Item "$widget->imageTypes" |
| 192 | Returns a list whose elements are all of the valid image types |
| 193 | (i.e., all of the values that may be supplied for the \fItype\fR |
| 194 | to create an image). |
| 195 | .IP "\fI$image\fR\->\fBwidth\fR" 4 |
| 196 | .IX Item "$image->width" |
| 197 | Returns a decimal string giving the width of image \fIname\fR |
| 198 | in pixels. |
| 199 | .SH "BUILT-IN IMAGE TYPES" |
| 200 | .IX Header "BUILT-IN IMAGE TYPES" |
| 201 | The following image types are defined by Tk so they will be available |
| 202 | in any Tk application. |
| 203 | Individual applications or extensions may define additional types. |
| 204 | .IP "\fBBitmap\fR" 4 |
| 205 | .IX Item "Bitmap" |
| 206 | Each pixel in the image displays a foreground color, a background |
| 207 | color, or nothing. |
| 208 | See Tk::Bitmap for more information. |
| 209 | .IP "\fBPixmap\fR" 4 |
| 210 | .IX Item "Pixmap" |
| 211 | \&\fBPixmap\fR is slightly more general than \fBBitmap\fR, each pixel can |
| 212 | be any available color or \*(L"transparent\*(R" (rendered as background color of the |
| 213 | widget image is displayed in). \fBPixmap\fR is best used for icons and other |
| 214 | simple graphics with only a few colors. |
| 215 | .Sp |
| 216 | \&\fBPixmap\fR is derived from Tix. See Tk::Pixmap for more information. |
| 217 | .IP "\fBPhoto\fR" 4 |
| 218 | .IX Item "Photo" |
| 219 | Displays a variety of full-color images, using dithering to |
| 220 | approximate colors on displays with limited color capabilities. |
| 221 | See Tk::Photo documentation for more information. |
| 222 | .SH "SEE ALSO" |
| 223 | .IX Header "SEE ALSO" |
| 224 | Tk::Bitmap |
| 225 | Tk::Pixmap |
| 226 | Tk::Photo |
| 227 | .SH "KEYWORDS" |
| 228 | .IX Header "KEYWORDS" |
| 229 | height, image, types of images, width |