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#include <tcl.h>
#include <tk.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include "tkRaster.h"
#include "tkRasterBuiltIn.h"
static int ParseCoords (Tcl_Interp *interp, int argc, char **argv,
double **coordptr, int *ncoordsptr)
/* -----------
*
* Parses the argv strings as doubles. Tries to detect when a string
* represents a number and stops when the string is not numeric. Stores
* in *coordptr a pointer to an array (dynamically allocatd) with
* the parsed values and in *ncoordsptr the number of values found.
* Returns a standard Tcl Result.
*/
{
int i;
double* coord = (double*) malloc (sizeof (double) * argc);
for (i = 0;
i < argc && (isdigit (argv [i][0]) ||
(argv [i][0]=='-' && isdigit (argv [i][1])));
++i) {
if (Tcl_GetDouble (interp, argv [i], & coord [i]) != TCL_OK) {
free (coord);
return TCL_ERROR;
}
}
* coordptr = coord;
* ncoordsptr = i;
return TCL_OK;
}
static int DrawLine (Tcl_Interp *interp, Tk_Raster *raster,
ClientData clientdata, int argc, char **argv)
/* --------
*
* Implements raster drawing commands of the form:
*
* <raster> draw_line <x0> <y0> <x1> <y1> ?... <xN> <yN>? ?-style <env>?
*
* Draws a polygonal line linking the successive points with
* coordinates (<xi>,<yi>) using the color and linestyle of the raster's
* current drawing environment or the one specified in the -style option.
*
* or
* <raster> fill_polygon <x0> <y0> <x1> <y1> ?... <xN> <yN>? ?-style <env>?
*
* Fills the polygon instead of drawing its outline.
*/
{
double *coords = NULL;
int n;
ClientData prevdrawenv = NULL;
ClientData drawenv;
int envno;
if (ParseCoords (interp, argc-2, argv+2, &coords, &n) != TCL_OK)
goto error;
if (n < 4 || n%2 == 1) {
Tcl_AppendResult (interp, "insufficient # of coordinates", (char*)NULL);
goto error;
}
if (argc > n+2) {
if (strncmp (argv [n+2], "-style", strlen (argv [n+2])) == 0) {
if (argc != n+4) {
Tcl_AppendResult (interp, "expecting style #", (char*) NULL);
goto error;
}
GetDrawEnv (raster, &prevdrawenv);
if (Tcl_GetInt (interp, argv [n+3], &envno) != TCL_OK ||
DrawEnvIndex (interp, raster, envno, &drawenv) != TCL_OK ||
SetDrawEnv (interp, raster, drawenv) != TCL_OK) {
goto error;
}
}
else {
Tcl_AppendResult (interp, "unrecognized option: ", argv [n+2],
(char*) NULL);
goto error;
}
}
if (argv [1][0] == 'f') {
RasterFillPolygon (raster, coords, n/2);
}
else {
RasterDrawLines (raster, coords, n/2);
}
free (coords);
if (prevdrawenv != NULL) SetDrawEnv (interp, raster, prevdrawenv);
return TCL_OK;
error:
if (coords != NULL) free (coords);
if (prevdrawenv != NULL) SetDrawEnv (interp, raster, prevdrawenv);
return TCL_ERROR;
}
static int DrawPoint (Tcl_Interp *interp, Tk_Raster *raster,
ClientData clientdata, int argc, char **argv)
/* --------
*
* Implements a raster drawing command of the form:
*
* <raster> draw_point <x0> <y0> ? ... <xN> <yN>? ?-style <env>?
*
* Draws the given points using the color of the raster's
* current drawing environment or the one specified in the -style option.
*/
{
double *coords = NULL;
int n;
ClientData prevdrawenv = NULL;
ClientData drawenv;
int envno;
if (ParseCoords (interp, argc-2, argv+2, &coords, &n) != TCL_OK)
goto error;
if (n < 2 || n%2 == 1) {
Tcl_AppendResult (interp, "insufficient # of coordinates", (char*)NULL);
goto error;
}
if (argc > n+2) {
if (strncmp (argv [n+2], "-style", strlen (argv [n+2])) == 0) {
if (argc != n+4) {
Tcl_AppendResult (interp, "expecting style #", (char*) NULL);
goto error;
}
GetDrawEnv (raster, &prevdrawenv);
if (Tcl_GetInt (interp, argv [n+3], &envno) != TCL_OK ||
DrawEnvIndex (interp, raster, envno, &drawenv) != TCL_OK ||
SetDrawEnv (interp, raster, drawenv) != TCL_OK) {
goto error;
}
}
else {
Tcl_AppendResult (interp, "unrecognized option: ", argv [n+2],
(char*) NULL);
goto error;
}
}
RasterDrawPoints (raster, coords, n/2);
free (coords);
if (prevdrawenv != NULL) SetDrawEnv (interp, raster, prevdrawenv);
return TCL_OK;
error:
if (coords != NULL) free (coords);
if (prevdrawenv != NULL) SetDrawEnv (interp, raster, prevdrawenv);
return TCL_ERROR;
}
static int DrawRect (Tcl_Interp *interp, Tk_Raster *raster,
ClientData clientdata, int argc, char **argv)
/* ---------
*
* Implements a raster drawing command of the form:
*
* <raster> xxx_rectangle <x0> <y0> <x1> <y1> ?... <xN> <yN>?
* ?-style <env>?
*
* (where xxx is 'draw' or 'fill)
*
* Draws (or fills) the given rectangles using the settings of the raster's
* current drawing environment or the one specified in the -style option.
*/
{
double *coords = NULL;
int n;
ClientData prevdrawenv = NULL;
ClientData drawenv;
int envno;
if (ParseCoords (interp, argc-2, argv+2, &coords, &n) != TCL_OK)
goto error;
if (n < 4 || n%4 != 0) {
Tcl_AppendResult (interp, "insufficient # of coordinates", (char*)NULL);
goto error;
}
if (argc > n+2) {
if (strncmp (argv [n+2], "-style", strlen (argv [n+2])) == 0) {
if (argc != n+4) {
Tcl_AppendResult (interp, "expecting style #", (char*) NULL);
goto error;
}
GetDrawEnv (raster, &prevdrawenv);
if (Tcl_GetInt (interp, argv [n+3], &envno) != TCL_OK ||
DrawEnvIndex (interp, raster, envno, &drawenv) != TCL_OK ||
SetDrawEnv (interp, raster, drawenv) != TCL_OK) {
goto error;
}
}
else {
Tcl_AppendResult (interp, "unrecognized option: ", argv [n+2],
(char*) NULL);
goto error;
}
}
if (argv [1][0] == 'f') {
RasterFillRectangles (raster, coords, n/4);
}
else {
RasterDrawRectangles (raster, coords, n/4);
}
free (coords);
if (prevdrawenv != NULL) SetDrawEnv (interp, raster, prevdrawenv);
return TCL_OK;
error:
if (coords != NULL) free (coords);
if (prevdrawenv != NULL) SetDrawEnv (interp, raster, prevdrawenv);
return TCL_ERROR;
}
int RasterBuiltInInit (interp)
/* -----------------
*
* Initializes the built in raster drawing commands
*/
Tcl_Interp * interp;
{
return (RasterAddPrimitive (interp, "draw_line", DrawLine,
(RasterPrimInitProc*) NULL,
(RasterPrimFreeProc*) NULL) == TCL_OK &&
RasterAddPrimitive (interp, "fill_polygon", DrawLine,
(RasterPrimInitProc*) NULL,
(RasterPrimFreeProc*) NULL) == TCL_OK &&
RasterAddPrimitive (interp, "draw_point", DrawPoint,
(RasterPrimInitProc*) NULL,
(RasterPrimFreeProc*) NULL) == TCL_OK &&
RasterAddPrimitive (interp, "draw_rectangle", DrawRect,
(RasterPrimInitProc*) NULL,
(RasterPrimFreeProc*) NULL) == TCL_OK &&
RasterAddPrimitive (interp, "fill_rectangle", DrawRect,
(RasterPrimInitProc*) NULL,
(RasterPrimFreeProc*) NULL) == TCL_OK)
? TCL_OK : TCL_ERROR;
}
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