GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 2.1AS(Slurm) |
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Tk_GetPixels(3) |
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Tk_GetPixelsFromObj, Tk_GetPixels, Tk_GetMMFromObj, Tk_GetScreenMM − translate between strings and screen units
#include <tk.h>
int
│
Tk_GetPixelsFromObj(interp, tkwin, objPtr,
intPtr) │
int
Tk_GetPixels(interp, tkwin, string,
intPtr)
int
│
Tk_GetMMFromObj(interp, tkwin, objPtr,
doublePtr) │
int
Tk_GetScreenMM(interp, tkwin, string,
doublePtr)
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Tcl_Interp *interp (in) |
Interpreter to use for error reporting. | ||
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Tk_Window tkwin (in) |
Window whose screen geometry determines the conversion between absolute units and pixels. |
Tcl_Obj *objPtr (in/out) │
String value specifies a distance on │ the screen; internal rep will be │ modified to cache converted distance. │
char *string (in) │
Same as objPtr except specification │ of distance is passed as a string.
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int *intPtr (out) |
Pointer to location in which to store converted distance in pixels. | ||
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double *doublePtr (out) |
Pointer to location in which to store converted distance in millimeters. |
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These procedures take as argument a specification of distance on the │ screen (objPtr or string) and compute the corresponding distance either in integer pixels or floating-point millimeters. In either case, │ objPtr or string specifies a screen distance as a floating-point number followed by one of the following characters that indicates units:
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<none> |
The number specifies a distance in pixels. | ||
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c |
The number specifies a distance in centimeters on the screen. | ||
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i |
The number specifies a distance in inches on the screen. | ||
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m |
The number specifies a distance in millimeters on the screen. | ||
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p |
The number specifies a distance in printer’s points (1/72 inch) on the screen. |
Tk_GetPixelsFromObj converts the value of objPtr to the nearest even │ number of pixels and stores that value at *intPtr. It returns TCL_OK │ under normal circumstances. If an error occurs (e.g. objPtr contains a │ number followed by a character that isn’t one of the ones above) then │ TCL_ERROR is returned and an error message is left in interp’s result │ if interp isn’t NULL. Tk_GetPixelsFromObj caches information about the │ return value in objPtr, which speeds up future calls to │ Tk_GetPixelsFromObj with the same objPtr. │
Tk_GetPixels is identical to Tk_GetPixelsFromObj except that the screen │ distance is specified with a string instead of an object. This │ prevents Tk_GetPixels from caching the return value, so Tk_GetAnchor is │ less efficient than Tk_GetPixelsFromObj. │
Tk_GetMMFromObj and Tk_GetScreenMM are similar to Tk_GetPixelsFromObj │ and Tk_GetPixels (respectively) except that they convert the screen │ distance to millimeters and store a double-precision floating-point │ result at *doublePtr.
centimeters, convert, inches, millimeters, pixels, points, screen units
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Tk_GetPixels(3) | |