/*
 * bltGrPen.c --
 *
 *	This module implements pens for the BLT graph widget.
 *
 * Copyright 1996-1998 Lucent Technologies, Inc.
 *
 * Permission to use, copy, modify, and distribute this software and
 * its documentation for any purpose and without fee is hereby
 * granted, provided that the above copyright notice appear in all
 * copies and that both that the copyright notice and warranty
 * disclaimer appear in supporting documentation, and that the names
 * of Lucent Technologies any of their entities not be used in
 * advertising or publicity pertaining to distribution of the software
 * without specific, written prior permission.
 *
 * Lucent Technologies disclaims all warranties with regard to this
 * software, including all implied warranties of merchantability and
 * fitness.  In no event shall Lucent Technologies be liable for any
 * special, indirect or consequential damages or any damages
 * whatsoever resulting from loss of use, data or profits, whether in
 * an action of contract, negligence or other tortuous action, arising
 * out of or in connection with the use or performance of this
 * software.
 */

#include "bltGraph.h"
#include <X11/Xutil.h>

static Tk_OptionParseProc StringToColor;
static Tk_OptionPrintProc ColorToString;
static Tk_OptionParseProc StringToPen;
static Tk_OptionPrintProc PenToString;
Tk_CustomOption bltColorOption =
{
    StringToColor, ColorToString, (ClientData)0
};
Tk_CustomOption bltPenOption =
{
    StringToPen, PenToString, (ClientData)0
};
Tk_CustomOption bltBarPenOption =
{
    StringToPen, PenToString, (ClientData)&bltBarElementUid
};
Tk_CustomOption bltLinePenOption =
{
    StringToPen, PenToString, (ClientData)&bltLineElementUid
};

/*
 *----------------------------------------------------------------------

 * StringToColor --
 *
 *	Convert the string representation of a color into a XColor pointer.
 *
 * Results:
 *	The return value is a standard Tcl result.  The color pointer is
 *	written into the widget record.
 *
 *----------------------------------------------------------------------
 */
/*ARGSUSED*/
static int
StringToColor(clientData, interp, tkwin, string, widgRec, offset)
    ClientData clientData;	/* Not used. */
    Tcl_Interp *interp;		/* Interpreter to send results back to */
    Tk_Window tkwin;		/* Not used. */
    char *string;		/* String representing color */
    char *widgRec;		/* Widget record */
    int offset;			/* Offset of color field in record */
{
    XColor **colorPtrPtr = (XColor **)(widgRec + offset);
    XColor *colorPtr;
    unsigned int length;
    char c;

    if ((string == NULL) || (*string == '\0')) {
	*colorPtrPtr = NULL;
	return TCL_OK;
    }
    c = string[0];
    length = strlen(string);

    if ((c == 'd') && (strncmp(string, "defcolor", length) == 0)) {
	colorPtr = COLOR_DEFAULT;
    } else {
	colorPtr = Tk_GetColor(interp, tkwin, Tk_GetUid(string));
	if (colorPtr == NULL) {
	    return TCL_ERROR;
	}
    }
    *colorPtrPtr = colorPtr;
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * NameOfColor --
 *
 *	Convert the color option value into a string.
 *
 * Results:
 *	The static string representing the color option is returned.
 *
 *----------------------------------------------------------------------
 */
static char *
NameOfColor(colorPtr)
    XColor *colorPtr;
{
    if (colorPtr == NULL) {
	return "";
    } else if (colorPtr == COLOR_DEFAULT) {
	return "defcolor";
    } else {
	return Tk_NameOfColor(colorPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * ColorToString --
 *
 *	Convert the color value into a string.
 *
 * Results:
 *	The string representing the symbol color is returned.
 *
 *----------------------------------------------------------------------
 */
/*ARGSUSED*/
static char *
ColorToString(clientData, tkwin, widgRec, offset, freeProcPtr)
    ClientData clientData;	/* Not used. */
    Tk_Window tkwin;		/* Not used. */
    char *widgRec;		/* Widget information record */
    int offset;			/* Offset of symbol type in record */
    Tcl_FreeProc **freeProcPtr;	/* Not used. */
{
    XColor *colorPtr = *(XColor **)(widgRec + offset);

    return NameOfColor(colorPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * StringToPen --
 *
 *	Convert the color value into a string.
 *
 * Results:
 *	The string representing the symbol color is returned.
 *
 *----------------------------------------------------------------------
 */
/*ARGSUSED*/
static int
StringToPen(clientData, interp, tkwin, string, widgRec, offset)
    ClientData clientData;	/* Not used. */
    Tcl_Interp *interp;		/* Interpreter to send results back to */
    Tk_Window tkwin;		/* Not used. */
    char *string;		/* String representing pen */
    char *widgRec;		/* Widget record */
    int offset;			/* Offset of pen field in record */
{
    Blt_Uid classUid = *(Blt_Uid *)clientData; /* Element type. */
    Pen **penPtrPtr = (Pen **)(widgRec + offset);
    Pen *penPtr;
    Graph *graphPtr;

    penPtr = NULL;
    graphPtr = Blt_GetGraphFromWindowData(tkwin);

    if (classUid == NULL) {	
	classUid = graphPtr->classUid;
    }
    if ((string != NULL) && (string[0] != '\0')) {
	if (Blt_GetPen(graphPtr, string, classUid, &penPtr) != TCL_OK) {
	    return TCL_ERROR;
	}
    }
    /* Release the old pen */
    if (*penPtrPtr != NULL) {
	Blt_FreePen(graphPtr, *penPtrPtr);
    }
    *penPtrPtr = penPtr;
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * PenToString --
 *
 *	Parse the name of the name.
 *
 * Results:
 *	The return value is a standard Tcl result.
 *
 *----------------------------------------------------------------------
 */
/*ARGSUSED*/
static char *
PenToString(clientData, tkwin, widgRec, offset, freeProcPtr)
    ClientData clientData;	/* Not used. */
    Tk_Window tkwin;		/* Not used. */
    char *widgRec;		/* Widget information record */
    int offset;			/* Offset of pen in record */
    Tcl_FreeProc **freeProcPtr;	/* Not used. */
{
    Pen *penPtr = *(Pen **)(widgRec + offset);
    if ( ! penPtr ) return NULL;
    return penPtr->name;
}

/*
 *----------------------------------------------------------------------
 *
 * NameToPen --
 *
 *	Find and return the pen style from a given name.
 *
 * Results:
 *     	A standard TCL result.
 *
 *----------------------------------------------------------------------
 */
static Pen *
NameToPen(graphPtr, name)
    Graph *graphPtr;
    char *name;
{
    Blt_HashEntry *hPtr;
    Pen *penPtr;

    hPtr = Blt_FindHashEntry(&(graphPtr->penTable), name);
    if (hPtr == NULL) {
      notFound:
	Tcl_AppendResult(graphPtr->interp, "can't find pen \"", name,
	    "\" in \"", Tk_PathName(graphPtr->tkwin), "\"", (char *)NULL);
	return NULL;
    }
    penPtr = (Pen *)Blt_GetHashValue(hPtr);
    if (penPtr->flags & PEN_DELETE_PENDING) {
	goto notFound;
    }
    return penPtr;
}

static void
DestroyPen(graphPtr, penPtr)
    Graph *graphPtr;
    Pen *penPtr;
{
    Tk_FreeOptions(penPtr->configSpecs, (char *)penPtr, graphPtr->display, 0);
    (*penPtr->destroyProc) (graphPtr, penPtr);
    if ((penPtr->name != NULL) && (penPtr->name[0] != '\0')) {
	Blt_Free(penPtr->name);
    }
    if (penPtr->hashPtr != NULL) {
	Blt_DeleteHashEntry(&(graphPtr->penTable), penPtr->hashPtr);
    }
    Blt_Free(penPtr);
}

void
Blt_FreePen(graphPtr, penPtr)
    Graph *graphPtr;
    Pen *penPtr;
{
    penPtr->refCount--;
    if ((penPtr->refCount == 0) && (penPtr->flags & PEN_DELETE_PENDING)) {
	DestroyPen(graphPtr, penPtr);
    }
}

Pen *
Blt_CreatePen(graphPtr, penName, classUid, nOpts, options)
    Graph *graphPtr;
    char *penName;
    Blt_Uid classUid;
    int nOpts;
    char **options;
{
    
    Pen *penPtr;
    Blt_HashEntry *hPtr;
    unsigned int length, configFlags;
    int isNew;
    register int i;

    /*
     * Scan the option list for a "-type" entry.  This will indicate
     * what type of pen we are creating. Otherwise we'll default to the
     * suggested type.  Last -type option wins.
     */
    for (i = 0; i < nOpts; i += 2) {
	length = strlen(options[i]);
	if ((length > 2) && (strncmp(options[i], "-type", length) == 0)) {
	    char *arg;

	    arg = options[i + 1];
	    if (strcmp(arg, "bar") == 0) {
		classUid = bltBarElementUid;
	    } else if (strcmp(arg, "line") != 0) {
		classUid = bltLineElementUid;
	    } else if (strcmp(arg, "strip") != 0) {
		classUid = bltLineElementUid;
	    } else {
		Tcl_AppendResult(graphPtr->interp, "unknown pen type \"",
		    arg, "\" specified", (char *)NULL);
		return NULL;
	    }
	}
    }
    if (classUid == bltStripElementUid) {
	classUid = bltLineElementUid;
    }
    hPtr = Blt_CreateHashEntry(&(graphPtr->penTable), penName, &isNew);
    if (!isNew) {
	penPtr = (Pen *)Blt_GetHashValue(hPtr);
	if (!(penPtr->flags & PEN_DELETE_PENDING)) {
	    Tcl_AppendResult(graphPtr->interp, "pen \"", penName,
		"\" already exists in \"", Tk_PathName(graphPtr->tkwin), "\"",
		(char *)NULL);
	    return NULL;
	}
	if (penPtr->classUid != classUid) {
	    Tcl_AppendResult(graphPtr->interp, "pen \"", penName,
		"\" in-use: can't change pen type from \"", penPtr->classUid, 
		"\" to \"", classUid, "\"", (char *)NULL);
	    return NULL;
	}
	penPtr->flags &= ~PEN_DELETE_PENDING;
    } else {
	if (classUid == bltBarElementUid) {
	    penPtr = Blt_BarPen(penName);
	} else {
	    penPtr = Blt_LinePen(penName);
	}
	penPtr->classUid = classUid;
	penPtr->hashPtr = hPtr;
	Blt_SetHashValue(hPtr, penPtr);
    }

    configFlags = (penPtr->flags & (ACTIVE_PEN | NORMAL_PEN));
    if (Blt_ConfigureWidgetComponent(graphPtr->interp, graphPtr->tkwin,
	    penPtr->name, "Pen", penPtr->configSpecs, nOpts, options,
	    (char *)penPtr, configFlags) != TCL_OK) {
	if (isNew) {
	    DestroyPen(graphPtr, penPtr);
	}
	return NULL;
    }
    (*penPtr->configProc) (graphPtr, penPtr);
    return penPtr;
}

int
Blt_GetPen(graphPtr, name, classUid, penPtrPtr)
    Graph *graphPtr;
    char *name;
    Blt_Uid classUid;
    Pen **penPtrPtr;
{
    Pen *penPtr;

    penPtr = NameToPen(graphPtr, name);
    if (penPtr == NULL) {
	return TCL_ERROR;
    }
    if (classUid == bltStripElementUid) {
	classUid = bltLineElementUid;
    }
    if (penPtr->classUid != classUid) {
	Tcl_AppendResult(graphPtr->interp, "pen \"", name, 
		"\" is the wrong type (is \"", penPtr->classUid, "\"", 
		", wanted \"", classUid, "\")", (char *)NULL);
	return TCL_ERROR;
    }
    penPtr->refCount++;
    *penPtrPtr = penPtr;
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Blt_DestroyPens --
 *
 *	Release memory and resources allocated for the style.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Everything associated with the pen style is freed up.
 *
 *----------------------------------------------------------------------
 */
void
Blt_DestroyPens(graphPtr)
    Graph *graphPtr;
{
    Blt_HashEntry *hPtr;
    Blt_HashSearch cursor;
    Pen *penPtr;

    for (hPtr = Blt_FirstHashEntry(&(graphPtr->penTable), &cursor);
	hPtr != NULL; hPtr = Blt_NextHashEntry(&cursor)) {
	penPtr = (Pen *)Blt_GetHashValue(hPtr);
	penPtr->hashPtr = NULL;
	DestroyPen(graphPtr, penPtr);
    }
    Blt_DeleteHashTable(&(graphPtr->penTable));
}

/*
 * ----------------------------------------------------------------------
 *
 * CgetOp --
 *
 *	Queries axis attributes (font, line width, label, etc).
 *
 * Results:
 *	A standard Tcl result.  If querying configuration values,
 *	interp->result will contain the results.
 *
 * ----------------------------------------------------------------------
 */
/* ARGSUSED */
static int
CgetOp(interp, graphPtr, argc, argv)
    Tcl_Interp *interp;
    Graph *graphPtr;
    int argc;			/* Not used. */
    char *argv[];
{
    Pen *penPtr;
    unsigned int configFlags;

    penPtr = NameToPen(graphPtr, argv[3]);
    if (penPtr == NULL) {
	return TCL_ERROR;
    }
    configFlags = (penPtr->flags & (ACTIVE_PEN | NORMAL_PEN));
    return Tk_ConfigureValue(interp, graphPtr->tkwin, penPtr->configSpecs,
	(char *)penPtr, argv[4], configFlags);
}

/*
 * ----------------------------------------------------------------------
 *
 * ConfigureOp --
 *
 *	Queries or resets pen attributes (font, line width, color, etc).
 *
 * Results:
 *	A standard Tcl result.  If querying configuration values,
 *	interp->result will contain the results.
 *
 * Side Effects:
 *	Pen resources are possibly allocated (GC, font).
 *
 * ----------------------------------------------------------------------
 */
static int
ConfigureOp(interp, graphPtr, argc, argv)
    Tcl_Interp *interp;
    Graph *graphPtr;
    int argc;
    CONST char *argv[];
{
    int flags;
    Pen *penPtr;
    int nNames, nOpts;
    int redraw;
    CONST char **options;
    register int i;

    /* Figure out where the option value pairs begin */
    argc -= 3;
    argv += 3;
    for (i = 0; i < argc; i++) {
	if (argv[i][0] == '-') {
	    break;
	}
	if (NameToPen(graphPtr, argv[i]) == NULL) {
	    return TCL_ERROR;
	}
    }
    nNames = i;			/* Number of pen names specified */
    nOpts = argc - i;		/* Number of options specified */
    options = argv + i;		/* Start of options in argv  */

    redraw = 0;
    for (i = 0; i < nNames; i++) {
	penPtr = NameToPen(graphPtr, argv[i]);
	flags = TK_CONFIG_ARGV_ONLY | (penPtr->flags & (ACTIVE_PEN|NORMAL_PEN));
	if (nOpts == 0) {
	    return Tk_ConfigureInfo(interp, graphPtr->tkwin, 
		    penPtr->configSpecs, (char *)penPtr, (char *)NULL, flags);
	} else if (nOpts == 1) {
	    return Tk_ConfigureInfo(interp, graphPtr->tkwin, 
		    penPtr->configSpecs, (char *)penPtr, options[0], flags);
	}
	if (Blt_ConfigureWidget(interp, graphPtr->tkwin, penPtr->configSpecs,
		nOpts, options, (char *)penPtr, flags) != TCL_OK) {
	    break;
	}
	(*penPtr->configProc) (graphPtr, penPtr);
	if (penPtr->refCount > 0) {
	    redraw++;
	}
    }
    if (redraw) {
	graphPtr->flags |= REDRAW_BACKING_STORE | DRAW_MARGINS;
	Blt_EventuallyRedrawGraph(graphPtr);
    }
    if (i < nNames) {
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * CreateOp --
 *
 *	Adds a new penstyle to the graph.
 *
 * Results:
 *	A standard Tcl result.
 *
 *----------------------------------------------------------------------
 */
static int
CreateOp(interp, graphPtr, argc, argv)
    Tcl_Interp *interp;
    Graph *graphPtr;
    int argc;
    char **argv;
{
    Pen *penPtr;

    penPtr = Blt_CreatePen(graphPtr, argv[3], graphPtr->classUid, argc - 4, 
	argv + 4);
    if (penPtr == NULL) {
	return TCL_ERROR;
    }
    Tcl_SetResult(interp, penPtr->name, TCL_VOLATILE);
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * DeleteOp --
 *
 *	Delete the given pen.
 *
 * Results:
 *	Always returns TCL_OK.  The interp->result field is
 *	a list of the graph axis limits.
 *
 *--------------------------------------------------------------
 */

/*ARGSUSED*/
static int
DeleteOp(interp, graphPtr, argc, argv)
    Tcl_Interp *interp;
    Graph *graphPtr;
    int argc;
    char **argv;
{
    Pen *penPtr;
    int i;

    for (i = 3; i < argc; i++) {
	penPtr = NameToPen(graphPtr, argv[i]);
	if (penPtr == NULL) {
	    return TCL_ERROR;
	}
	if (penPtr->flags & PEN_DELETE_PENDING) {
	    Tcl_AppendResult(graphPtr->interp, "can't find pen \"", argv[i],
		"\" in \"", Tk_PathName(graphPtr->tkwin), "\"", (char *)NULL);
	    return TCL_ERROR;
	}
	penPtr->flags |= PEN_DELETE_PENDING;
	if (penPtr->refCount == 0) {
	    DestroyPen(graphPtr, penPtr);
	}
    }
    return TCL_OK;
}

/*
 * ----------------------------------------------------------------------
 *
 * NamesOp --
 *
 *	Return a list of the names of all the axes.
 *
 * Results:
 *	Returns a standard Tcl result.
 *
 * ----------------------------------------------------------------------
 */
/*ARGSUSED*/
static int
NamesOp(interp, graphPtr, argc, argv)
    Tcl_Interp *interp;
    Graph *graphPtr;
    int argc;
    char **argv;
{
    Blt_HashSearch cursor;
    Pen *penPtr;
    register int i;
    register Blt_HashEntry *hPtr;

    for (hPtr = Blt_FirstHashEntry(&(graphPtr->penTable), &cursor);
	hPtr != NULL; hPtr = Blt_NextHashEntry(&cursor)) {
	penPtr = (Pen *)Blt_GetHashValue(hPtr);
	if (penPtr->flags & PEN_DELETE_PENDING) {
	    continue;
	}
	if (argc == 3) {
	    Tcl_AppendElement(interp, penPtr->name);
	    continue;
	}
	for (i = 3; i < argc; i++) {
	    if (Tcl_StringMatch(penPtr->name, argv[i])) {
		Tcl_AppendElement(interp, penPtr->name);
		break;
	    }
	}
    }
    return TCL_OK;
}

/*
 * ----------------------------------------------------------------------
 *
 * TypeOp --
 *
 *	Return the type of pen.
 *
 * Results:
 *	Returns a standard Tcl result.
 *
 * ----------------------------------------------------------------------
 */
/*ARGSUSED*/
static int
TypeOp(interp, graphPtr, argc, argv)
    Tcl_Interp *interp;
    Graph *graphPtr;
    int argc;
    char **argv;
{
    Pen *penPtr;

    penPtr = NameToPen(graphPtr, argv[3]);
    if (penPtr == NULL) {
	return TCL_ERROR;
    }
    Tcl_SetResult(interp, penPtr->classUid, TCL_STATIC);
    return TCL_OK;
}

static Blt_OpSpec penOps[] =
{
    {"cget", 2, (Blt_Op)CgetOp, 5, 5, "penName option",},
    {"configure", 2, (Blt_Op)ConfigureOp, 4, 0,
	"penName ?penName?... ?option value?...",},
    {"create", 2, (Blt_Op)CreateOp, 4, 0, "penName ?option value?...",},
    {"delete", 2, (Blt_Op)DeleteOp, 3, 0, "?penName?...",},
    {"names", 1, (Blt_Op)NamesOp, 3, 0, "?pattern?...",},
    {"type", 1, (Blt_Op)TypeOp, 4, 4, "penName",},
};
static int nPenOps = sizeof(penOps) / sizeof(Blt_OpSpec);

int
Blt_PenOp(graphPtr, interp, argc, argv)
    Graph *graphPtr;
    Tcl_Interp *interp;
    int argc;
    char **argv;
{
    Blt_Op proc;

    proc = Blt_GetOp(interp, nPenOps, penOps, BLT_OP_ARG2, argc, argv, 0);
    if (proc == NULL) {
	return TCL_ERROR;
    }
    return (*proc) (interp, graphPtr, argc, argv);
}