archie/tk4.2/generic/tkCanvUtil.c
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/*
* tkCanvUtil.c --
*
* This procedure contains a collection of utility procedures
* used by the implementations of various canvas item types.
*
* Copyright (c) 1994 Sun Microsystems, Inc.
* Copyright (c) 1994 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* SCCS: @(#) tkCanvUtil.c 1.6 96/02/15 18:53:10
*/
#include "tk.h"
#include "tkCanvas.h"
#include "tkPort.h"
/*
*----------------------------------------------------------------------
*
* Tk_CanvasTkwin --
*
* Given a token for a canvas, this procedure returns the
* widget that represents the canvas.
*
* Results:
* The return value is a handle for the widget.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tk_Window
Tk_CanvasTkwin(canvas)
Tk_Canvas canvas; /* Token for the canvas. */
{
TkCanvas *canvasPtr = (TkCanvas *) canvas;
return canvasPtr->tkwin;
}
/*
*----------------------------------------------------------------------
*
* Tk_CanvasDrawableCoords --
*
* Given an (x,y) coordinate pair within a canvas, this procedure
* returns the corresponding coordinates at which the point should
* be drawn in the drawable used for display.
*
* Results:
* There is no return value. The values at *drawableXPtr and
* *drawableYPtr are filled in with the coordinates at which
* x and y should be drawn. These coordinates are clipped
* to fit within a "short", since this is what X uses in
* most cases for drawing.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
Tk_CanvasDrawableCoords(canvas, x, y, drawableXPtr, drawableYPtr)
Tk_Canvas canvas; /* Token for the canvas. */
double x, y; /* Coordinates in canvas space. */
short *drawableXPtr, *drawableYPtr; /* Screen coordinates are stored
* here. */
{
TkCanvas *canvasPtr = (TkCanvas *) canvas;
double tmp;
tmp = x - canvasPtr->drawableXOrigin;
if (tmp > 0) {
tmp += 0.5;
} else {
tmp -= 0.5;
}
if (tmp > 32767) {
*drawableXPtr = 32767;
} else if (tmp < -32768) {
*drawableXPtr = -32768;
} else {
*drawableXPtr = tmp;
}
tmp = y - canvasPtr->drawableYOrigin;
if (tmp > 0) {
tmp += 0.5;
} else {
tmp -= 0.5;
}
if (tmp > 32767) {
*drawableYPtr = 32767;
} else if (tmp < -32768) {
*drawableYPtr = -32768;
} else {
*drawableYPtr = tmp;
}
}
/*
*----------------------------------------------------------------------
*
* Tk_CanvasWindowCoords --
*
* Given an (x,y) coordinate pair within a canvas, this procedure
* returns the corresponding coordinates in the canvas's window.
*
* Results:
* There is no return value. The values at *screenXPtr and
* *screenYPtr are filled in with the coordinates at which
* (x,y) appears in the canvas's window. These coordinates
* are clipped to fit within a "short", since this is what X
* uses in most cases for drawing.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
Tk_CanvasWindowCoords(canvas, x, y, screenXPtr, screenYPtr)
Tk_Canvas canvas; /* Token for the canvas. */
double x, y; /* Coordinates in canvas space. */
short *screenXPtr, *screenYPtr; /* Screen coordinates are stored
* here. */
{
TkCanvas *canvasPtr = (TkCanvas *) canvas;
double tmp;
tmp = x - canvasPtr->xOrigin;
if (tmp > 0) {
tmp += 0.5;
} else {
tmp -= 0.5;
}
if (tmp > 32767) {
*screenXPtr = 32767;
} else if (tmp < -32768) {
*screenXPtr = -32768;
} else {
*screenXPtr = tmp;
}
tmp = y - canvasPtr->yOrigin;
if (tmp > 0) {
tmp += 0.5;
} else {
tmp -= 0.5;
}
if (tmp > 32767) {
*screenYPtr = 32767;
} else if (tmp < -32768) {
*screenYPtr = -32768;
} else {
*screenYPtr = tmp;
}
}
/*
*--------------------------------------------------------------
*
* Tk_CanvasGetCoord --
*
* Given a string, returns a floating-point canvas coordinate
* corresponding to that string.
*
* Results:
* The return value is a standard Tcl return result. If
* TCL_OK is returned, then everything went well and the
* canvas coordinate is stored at *doublePtr; otherwise
* TCL_ERROR is returned and an error message is left in
* interp->result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
int
Tk_CanvasGetCoord(interp, canvas, string, doublePtr)
Tcl_Interp *interp; /* Interpreter for error reporting. */
Tk_Canvas canvas; /* Canvas to which coordinate applies. */
char *string; /* Describes coordinate (any screen
* coordinate form may be used here). */
double *doublePtr; /* Place to store converted coordinate. */
{
TkCanvas *canvasPtr = (TkCanvas *) canvas;
if (Tk_GetScreenMM(canvasPtr->interp, canvasPtr->tkwin, string,
doublePtr) != TCL_OK) {
return TCL_ERROR;
}
*doublePtr *= canvasPtr->pixelsPerMM;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tk_CanvasSetStippleOrigin --
*
* This procedure sets the stipple origin in a graphics context
* so that stipples drawn with the GC will line up with other
* stipples previously drawn in the canvas.
*
* Results:
* None.
*
* Side effects:
* The graphics context is modified.
*
*----------------------------------------------------------------------
*/
void
Tk_CanvasSetStippleOrigin(canvas, gc)
Tk_Canvas canvas; /* Token for a canvas. */
GC gc; /* Graphics context that is about to be
* used to draw a stippled pattern as
* part of redisplaying the canvas. */
{
TkCanvas *canvasPtr = (TkCanvas *) canvas;
XSetTSOrigin(canvasPtr->display, gc, -canvasPtr->drawableXOrigin,
-canvasPtr->drawableYOrigin);
}
/*
*----------------------------------------------------------------------
*
* Tk_CanvasGetTextInfo --
*
* This procedure returns a pointer to a structure containing
* information about the selection and insertion cursor for
* a canvas widget. Items such as text items save the pointer
* and use it to share access to the information with the generic
* canvas code.
*
* Results:
* The return value is a pointer to the structure holding text
* information for the canvas. Most of the fields should not
* be modified outside the generic canvas code; see the user
* documentation for details.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tk_CanvasTextInfo *
Tk_CanvasGetTextInfo(canvas)
Tk_Canvas canvas; /* Token for the canvas widget. */
{
return &((TkCanvas *) canvas)->textInfo;
}
/*
*--------------------------------------------------------------
*
* Tk_CanvasTagsParseProc --
*
* This procedure is invoked during option processing to handle
* "-tags" options for canvas items.
*
* Results:
* A standard Tcl return value.
*
* Side effects:
* The tags for a given item get replaced by those indicated
* in the value argument.
*
*--------------------------------------------------------------
*/
int
Tk_CanvasTagsParseProc(clientData, interp, tkwin, value, widgRec, offset)
ClientData clientData; /* Not used.*/
Tcl_Interp *interp; /* Used for reporting errors. */
Tk_Window tkwin; /* Window containing canvas widget. */
char *value; /* Value of option (list of tag
* names). */
char *widgRec; /* Pointer to record for item. */
int offset; /* Offset into item (ignored). */
{
register Tk_Item *itemPtr = (Tk_Item *) widgRec;
int argc, i;
char **argv;
Tk_Uid *newPtr;
/*
* Break the value up into the individual tag names.
*/
if (Tcl_SplitList(interp, value, &argc, &argv) != TCL_OK) {
return TCL_ERROR;
}
/*
* Make sure that there's enough space in the item to hold the
* tag names.
*/
if (itemPtr->tagSpace < argc) {
newPtr = (Tk_Uid *) ckalloc((unsigned) (argc * sizeof(Tk_Uid)));
for (i = itemPtr->numTags-1; i >= 0; i--) {
newPtr[i] = itemPtr->tagPtr[i];
}
if (itemPtr->tagPtr != itemPtr->staticTagSpace) {
ckfree((char *) itemPtr->tagPtr);
}
itemPtr->tagPtr = newPtr;
itemPtr->tagSpace = argc;
}
itemPtr->numTags = argc;
for (i = 0; i < argc; i++) {
itemPtr->tagPtr[i] = Tk_GetUid(argv[i]);
}
ckfree((char *) argv);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* Tk_CanvasTagsPrintProc --
*
* This procedure is invoked by the Tk configuration code
* to produce a printable string for the "-tags" configuration
* option for canvas items.
*
* Results:
* The return value is a string describing all the tags for
* the item referred to by "widgRec". In addition, *freeProcPtr
* is filled in with the address of a procedure to call to free
* the result string when it's no longer needed (or NULL to
* indicate that the string doesn't need to be freed).
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
char *
Tk_CanvasTagsPrintProc(clientData, tkwin, widgRec, offset, freeProcPtr)
ClientData clientData; /* Ignored. */
Tk_Window tkwin; /* Window containing canvas widget. */
char *widgRec; /* Pointer to record for item. */
int offset; /* Ignored. */
Tcl_FreeProc **freeProcPtr; /* Pointer to variable to fill in with
* information about how to reclaim
* storage for return string. */
{
register Tk_Item *itemPtr = (Tk_Item *) widgRec;
if (itemPtr->numTags == 0) {
*freeProcPtr = (Tcl_FreeProc *) NULL;
return "";
}
if (itemPtr->numTags == 1) {
*freeProcPtr = (Tcl_FreeProc *) NULL;
return (char *) itemPtr->tagPtr[0];
}
*freeProcPtr = TCL_DYNAMIC;
return Tcl_Merge(itemPtr->numTags, (char **) itemPtr->tagPtr);
}