/*
 * bltGrGrid.c --
 *
 *	This module implements grid lines for the BLT graph widget.
 *
 * Copyright 1995-1998 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.
 *
 * Graph widget created by Sani Nassif and George Howlett.
 */

#include "bltGraph.h"

extern Tk_CustomOption bltDistanceOption;
extern Tk_CustomOption bltDashesOption;
extern Tk_CustomOption bltAnyXAxisOption;
extern Tk_CustomOption bltAnyYAxisOption;


#define DEF_GRID_DASHES		"dot"
#define DEF_GRID_FOREGROUND	RGB_GREY64
#define DEF_GRID_FG_MONO	RGB_BLACK
#define DEF_GRID_LINE_WIDTH	"0"
#define DEF_GRID_HIDE_BARCHART	"no"
#define DEF_GRID_HIDE_GRAPH	"yes"
#define DEF_GRID_MINOR		"yes"
#define DEF_GRID_MAP_X_GRAPH	"x"
#define DEF_GRID_MAP_X_BARCHART	(char *)NULL
#define DEF_GRID_MAP_Y		"y"
#define DEF_GRID_POSITION	(char *)NULL

static Tk_ConfigSpec configSpecs[] =
{
    {TK_CONFIG_COLOR, "-color", "color", "Color",
	DEF_GRID_FOREGROUND, Tk_Offset(Grid, colorPtr),
	TK_CONFIG_COLOR_ONLY | ALL_GRAPHS},
    {TK_CONFIG_COLOR, "-color", "color", "color",
	DEF_GRID_FG_MONO, Tk_Offset(Grid, colorPtr),
	TK_CONFIG_MONO_ONLY | ALL_GRAPHS},
    {TK_CONFIG_CUSTOM, "-dashes", "dashes", "Dashes",
	DEF_GRID_DASHES, Tk_Offset(Grid, dashes),
	TK_CONFIG_NULL_OK | ALL_GRAPHS, &bltDashesOption},
    {TK_CONFIG_BOOLEAN, "-hide", "hide", "Hide",
	DEF_GRID_HIDE_BARCHART, Tk_Offset(Grid, hidden), BARCHART},
    {TK_CONFIG_BOOLEAN, "-hide", "hide", "Hide",
	DEF_GRID_HIDE_GRAPH, Tk_Offset(Grid, hidden), GRAPH | STRIPCHART},
    {TK_CONFIG_CUSTOM, "-linewidth", "lineWidth", "Linewidth",
	DEF_GRID_LINE_WIDTH, Tk_Offset(Grid, lineWidth),
	TK_CONFIG_DONT_SET_DEFAULT | ALL_GRAPHS, &bltDistanceOption},
    {TK_CONFIG_CUSTOM, "-mapx", "mapX", "MapX",
	DEF_GRID_MAP_X_GRAPH, Tk_Offset(Grid, axes.x),
	GRAPH | STRIPCHART, &bltAnyXAxisOption},
    {TK_CONFIG_CUSTOM, "-mapx", "mapX", "MapX",
	DEF_GRID_MAP_X_BARCHART, Tk_Offset(Grid, axes.x),
	BARCHART, &bltAnyXAxisOption},
    {TK_CONFIG_CUSTOM, "-mapy", "mapY", "MapY",
	DEF_GRID_MAP_Y, Tk_Offset(Grid, axes.y),
	ALL_GRAPHS, &bltAnyYAxisOption},
    {TK_CONFIG_BOOLEAN, "-minor", "minor", "Minor",
	DEF_GRID_MINOR, Tk_Offset(Grid, minorGrid),
	TK_CONFIG_DONT_SET_DEFAULT | ALL_GRAPHS},
    {TK_CONFIG_BOOLEAN, "-raised", "raised", "Raised",
	"0", Tk_Offset(Grid, raised),
	TK_CONFIG_DONT_SET_DEFAULT | ALL_GRAPHS},
    {TK_CONFIG_END, NULL, NULL, NULL, NULL, 0, 0}
};

/*
 *----------------------------------------------------------------------
 *
 * ConfigureGrid --
 *
 *	Configures attributes of the grid such as line width,
 *	dashes, and position.  The grid are first turned off
 *	before any of the attributes changes.
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	Crosshair GC is allocated.
 *
 *----------------------------------------------------------------------
 */
static void
ConfigureGrid(graphPtr, gridPtr)
    Graph *graphPtr;
    Grid *gridPtr;
{
    XGCValues gcValues;
    unsigned long gcMask;
    GC newGC;

    gcValues.background = gcValues.foreground = gridPtr->colorPtr->pixel;
    gcValues.line_width = LineWidth(gridPtr->lineWidth);
    gcMask = (GCForeground | GCBackground | GCLineWidth);
    if (LineIsDashed(gridPtr->dashes)) {
	gcValues.line_style = LineOnOffDash;
	gcMask |= GCLineStyle;
    }
    newGC = Blt_GetPrivateGC(graphPtr->tkwin, gcMask, &gcValues);
    if (LineIsDashed(gridPtr->dashes)) {
	Blt_SetDashes(graphPtr->display, newGC, &(gridPtr->dashes));
    }
    if (gridPtr->gc != NULL) {
	Blt_FreePrivateGC(graphPtr->display, gridPtr->gc);
    }
    gridPtr->gc = newGC;
}

/*
 *----------------------------------------------------------------------
 *
 * MapGrid --
 *
 *	Determines the coordinates of the line segments corresponding
 *	to the grid lines for each axis.
 *
 * Results:
 *	None.
 *
 *----------------------------------------------------------------------
 */
void
Blt_MapGrid(graphPtr)
    Graph *graphPtr;
{
    Grid *gridPtr = (Grid *)graphPtr->gridPtr;
    int nSegments;
    Segment2D *segments;

    if (gridPtr->x.segments != NULL) {
	Blt_Free(gridPtr->x.segments);
	gridPtr->x.segments = NULL;
    }
    if (gridPtr->y.segments != NULL) {
	Blt_Free(gridPtr->y.segments);
	gridPtr->y.segments = NULL;
    }
    gridPtr->x.nSegments = gridPtr->y.nSegments = 0;
    /*
     * Generate line segments to represent the grid.  Line segments
     * are calculated from the major tick intervals of each axis mapped.
     */
    Blt_GetAxisSegments(graphPtr, gridPtr->axes.x, &segments, &nSegments);
    if (nSegments > 0) {
	gridPtr->x.nSegments = nSegments;
	gridPtr->x.segments = segments;
    }
    Blt_GetAxisSegments(graphPtr, gridPtr->axes.y, &segments, &nSegments);
    if (nSegments > 0) {
	gridPtr->y.nSegments = nSegments;
	gridPtr->y.segments = segments;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * DrawGrid --
 *
 *	Draws the grid lines associated with each axis.
 *
 * Results:
 *	None.
 *
 *----------------------------------------------------------------------
 */
void
Blt_DrawGrid(graphPtr, drawable)
    Graph *graphPtr;
    Drawable drawable;		/* Pixmap or window to draw into */
{
    Grid *gridPtr = (Grid *)graphPtr->gridPtr;

    if (gridPtr->hidden) {
	return;
    }
    if (gridPtr->x.nSegments > 0) {
	Blt_Draw2DSegments(graphPtr->display, drawable, gridPtr->gc, 
			 gridPtr->x.segments, gridPtr->x.nSegments);
    }
    if (gridPtr->y.nSegments > 0) {
	Blt_Draw2DSegments(graphPtr->display, drawable, gridPtr->gc,
	    gridPtr->y.segments, gridPtr->y.nSegments);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Blt_GridToPostScript --
 *
 *	Prints the grid lines associated with each axis.
 *
 * Results:
 *	None.
 *
 *----------------------------------------------------------------------
 */
void
Blt_GridToPostScript(graphPtr, psToken)
    Graph *graphPtr;
    PsToken psToken;
{
    Grid *gridPtr = (Grid *)graphPtr->gridPtr;

    if (gridPtr->hidden) {
	return;
    }
    Blt_LineAttributesToPostScript(psToken, gridPtr->colorPtr,
	gridPtr->lineWidth, &(gridPtr->dashes), CapButt, JoinMiter);
    if (gridPtr->x.nSegments > 0) {
	Blt_2DSegmentsToPostScript(psToken, gridPtr->x.segments, 
			gridPtr->x.nSegments);
    }
    if (gridPtr->y.nSegments > 0) {
	Blt_2DSegmentsToPostScript(psToken, gridPtr->y.segments, 
			gridPtr->y.nSegments);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Blt_DestroyGrid --
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	Grid GC is released.
 *
 *----------------------------------------------------------------------
 */
void
Blt_DestroyGrid(graphPtr)
    Graph *graphPtr;
{
    Grid *gridPtr = (Grid *)graphPtr->gridPtr;

    Tk_FreeOptions(configSpecs, (char *)gridPtr, graphPtr->display,
	Blt_GraphType(graphPtr));
    if (gridPtr->gc != NULL) {
	Blt_FreePrivateGC(graphPtr->display, gridPtr->gc);
    }
    if (gridPtr->x.segments != NULL) {
	Blt_Free(gridPtr->x.segments);
    }
    if (gridPtr->y.segments != NULL) {
	Blt_Free(gridPtr->y.segments);
    }
    Blt_Free(gridPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Blt_CreateGrid --
 *
 *	Creates and initializes a new grid structure.
 *
 * Results:
 *	Returns TCL_ERROR if the configuration failed, otherwise TCL_OK.
 *
 * Side Effects:
 *	Memory for grid structure is allocated.
 *
 *----------------------------------------------------------------------
 */
int
Blt_CreateGrid(graphPtr)
    Graph *graphPtr;
{
    Grid *gridPtr;

    gridPtr = Blt_Calloc(1, sizeof(Grid));
    assert(gridPtr);
    gridPtr->minorGrid = TRUE;
    graphPtr->gridPtr = gridPtr;

    if (Blt_ConfigureWidgetComponent(graphPtr->interp, graphPtr->tkwin, "grid",
	    "Grid", configSpecs, 0, (char **)NULL, (char *)gridPtr,
	    Blt_GraphType(graphPtr)) != TCL_OK) {
	return TCL_ERROR;
    }
    ConfigureGrid(graphPtr, gridPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * CgetOp --
 *
 *	Queries configuration attributes of the grid such as line
 *	width, dashes, and position.
 *
 * Results:
 *	A standard Tcl result.
 *
 *----------------------------------------------------------------------
 */
/* ARGSUSED */
static int
CgetOp(graphPtr, interp, argc, argv)
    Graph *graphPtr;
    Tcl_Interp *interp;
    int argc;
    char **argv;
{
    Grid *gridPtr = (Grid *)graphPtr->gridPtr;

    return Tk_ConfigureValue(interp, graphPtr->tkwin, configSpecs,
	(char *)gridPtr, argv[3], Blt_GraphType(graphPtr));
}

/*
 *----------------------------------------------------------------------
 *
 * ConfigureOp --
 *
 *	Queries or resets configuration attributes of the grid
 * 	such as line width, dashes, and position.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side Effects:
 *	Grid attributes are reset.  The graph is redrawn at the
 *	next idle point.
 *
 *----------------------------------------------------------------------
 */
static int
ConfigureOp(graphPtr, interp, argc, argv)
    Graph *graphPtr;
    Tcl_Interp *interp;
    int argc;
    CONST char **argv;
{
    Grid *gridPtr = (Grid *)graphPtr->gridPtr;
    int flags;

    flags = Blt_GraphType(graphPtr) | TK_CONFIG_ARGV_ONLY;
    if (argc == 3) {
	return Tk_ConfigureInfo(interp, graphPtr->tkwin, configSpecs,
	    (char *)gridPtr, (char *)NULL, flags);
    } else if (argc == 4) {
	return Tk_ConfigureInfo(interp, graphPtr->tkwin, configSpecs,
	    (char *)gridPtr, argv[3], flags);
    }
    if (Blt_ConfigureWidget(graphPtr->interp, graphPtr->tkwin, configSpecs,
	    argc - 3, argv + 3, (char *)gridPtr, flags) != TCL_OK) {
	return TCL_ERROR;
    }
    ConfigureGrid(graphPtr, gridPtr);
    graphPtr->flags |= REDRAW_BACKING_STORE;
    Blt_EventuallyRedrawGraph(graphPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * MapOp --
 *
 *	Maps the grid.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side Effects:
 *	Grid attributes are reset and the graph is redrawn if necessary.
 *
 *----------------------------------------------------------------------
 */
/*ARGSUSED*/
static int
MapOp(graphPtr, interp, argc, argv)
    Graph *graphPtr;
    Tcl_Interp *interp;
    int argc;
    char **argv;
{
    Grid *gridPtr = (Grid *)graphPtr->gridPtr;

    if (gridPtr->hidden) {
	gridPtr->hidden = FALSE;/* Changes "-hide" configuration option */
	graphPtr->flags |= REDRAW_BACKING_STORE;
	Blt_EventuallyRedrawGraph(graphPtr);
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * MapOp --
 *
 *	Maps or unmaps the grid (off or on).
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side Effects:
 *	Grid attributes are reset and the graph is redrawn if necessary.
 *
 *----------------------------------------------------------------------
 */
/*ARGSUSED*/
static int
UnmapOp(graphPtr, interp, argc, argv)
    Graph *graphPtr;
    Tcl_Interp *interp;
    int argc;
    char **argv;
{
    Grid *gridPtr = (Grid *)graphPtr->gridPtr;

    if (!gridPtr->hidden) {
	gridPtr->hidden = TRUE;	/* Changes "-hide" configuration option */
	graphPtr->flags |= REDRAW_BACKING_STORE;
	Blt_EventuallyRedrawGraph(graphPtr);
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * ToggleOp --
 *
 *	Toggles the state of the grid shown/hidden.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side Effects:
 *	Grid is hidden/displayed. The graph is redrawn at the next
 *	idle time.
 *
 *----------------------------------------------------------------------
 */
/*ARGSUSED*/
static int
ToggleOp(graphPtr, interp, argc, argv)
    Graph *graphPtr;
    Tcl_Interp *interp;
    int argc;
    char **argv;
{
    Grid *gridPtr = (Grid *)graphPtr->gridPtr;

    gridPtr->hidden = (!gridPtr->hidden);
    graphPtr->flags |= REDRAW_BACKING_STORE;
    Blt_EventuallyRedrawGraph(graphPtr);
    return TCL_OK;
}


static Blt_OpSpec gridOps[] =
{
    {"cget", 2, (Blt_Op)CgetOp, 4, 4, "option",},
    {"configure", 2, (Blt_Op)ConfigureOp, 3, 0, "?options...?",},
    {"off", 2, (Blt_Op)UnmapOp, 3, 3, "",},
    {"on", 2, (Blt_Op)MapOp, 3, 3, "",},
    {"toggle", 1, (Blt_Op)ToggleOp, 3, 3, "",},
};
static int nGridOps = sizeof(gridOps) / sizeof(Blt_OpSpec);

/*
 *----------------------------------------------------------------------
 *
 * Blt_GridOp --
 *
 *	User routine to configure grid lines.  Grids are drawn
 *	at major tick intervals across the graph.
 *
 * Results:
 *	The return value is a standard Tcl result.
 *
 * Side Effects:
 *	Grid may be drawn in the plotting area.
 *
 *----------------------------------------------------------------------
 */
int
Blt_GridOp(graphPtr, interp, argc, argv)
    Graph *graphPtr;
    Tcl_Interp *interp;
    int argc;
    char **argv;
{
    Blt_Op proc;

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