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/*
* bltGrHairs.c --
*
* This module implements crosshairs for the BLT graph widget.
*
* Copyright 1993-2004 George A Howlett.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
* KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
* OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "bltGraph.h"
#include "bltOp.h"
typedef int (GraphCrosshairProc)(Graph *graphPtr, Tcl_Interp *interp,
int objc, Tcl_Obj *const *objv);
/*
*---------------------------------------------------------------------------
*
* Crosshairs
*
* Contains the line segments positions and graphics context used
* to simulate crosshairs (by XORing) on the graph.
*
*---------------------------------------------------------------------------
*/
struct _Crosshairs {
XPoint hotSpot; /* Hot spot for crosshairs */
int visible; /* Internal state of crosshairs. If non-zero,
* crosshairs are displayed. */
int hidden; /* If non-zero, crosshairs are not displayed.
* This is not necessarily consistent with the
* internal state variable. This is true when
* the hot spot is off the graph. */
Blt_Dashes dashes; /* Dashstyle of the crosshairs. This represents
* an array of alternatingly drawn pixel
* values. If NULL, the hairs are drawn as a
* solid line */
int lineWidth; /* Width of the simulated crosshair lines */
XSegment segArr[2]; /* Positions of line segments representing the
* simulated crosshairs. */
XColor *colorPtr; /* Foreground color of crosshairs */
GC gc; /* Graphics context for crosshairs. Set to
* GXxor to not require redraws of graph */
};
#define DEF_HAIRS_DASHES (char *)NULL
#define DEF_HAIRS_FOREGROUND RGB_BLACK
#define DEF_HAIRS_LINE_WIDTH "0"
#define DEF_HAIRS_HIDE "yes"
#define DEF_HAIRS_POSITION (char *)NULL
extern Blt_CustomOption bltPointOption;
static Blt_ConfigSpec configSpecs[] =
{
{BLT_CONFIG_COLOR, "-color", "color", "Color", DEF_HAIRS_FOREGROUND,
Blt_Offset(Crosshairs, colorPtr), 0},
{BLT_CONFIG_DASHES, "-dashes", "dashes", "Dashes", DEF_HAIRS_DASHES,
Blt_Offset(Crosshairs, dashes), BLT_CONFIG_NULL_OK},
{BLT_CONFIG_BOOLEAN, "-hide", "hide", "Hide", DEF_HAIRS_HIDE,
Blt_Offset(Crosshairs, hidden), BLT_CONFIG_DONT_SET_DEFAULT},
{BLT_CONFIG_PIXELS_NNEG, "-linewidth", "lineWidth", "Linewidth",
DEF_HAIRS_LINE_WIDTH, Blt_Offset(Crosshairs, lineWidth),
BLT_CONFIG_DONT_SET_DEFAULT},
{BLT_CONFIG_CUSTOM, "-position", "position", "Position",
DEF_HAIRS_POSITION, Blt_Offset(Crosshairs, hotSpot), 0, &bltPointOption},
{BLT_CONFIG_END, NULL, NULL, NULL, NULL, 0, 0}
};
/*
*---------------------------------------------------------------------------
*
* TurnOffHairs --
*
* XOR's the existing line segments (representing the crosshairs),
* thereby erasing them. The internal state of the crosshairs is
* tracked.
*
* Results:
* None
*
* Side Effects:
* Crosshairs are erased.
*
*---------------------------------------------------------------------------
*/
static void
TurnOffHairs(Tk_Window tkwin, Crosshairs *chPtr)
{
if (Tk_IsMapped(tkwin) && (chPtr->visible)) {
XDrawSegments(Tk_Display(tkwin), Tk_WindowId(tkwin), chPtr->gc,
chPtr->segArr, 2);
chPtr->visible = FALSE;
}
}
/*
*---------------------------------------------------------------------------
*
* TurnOnHairs --
*
* Draws (by XORing) new line segments, creating the effect of
* crosshairs. The internal state of the crosshairs is tracked.
*
* Results:
* None
*
* Side Effects:
* Crosshairs are displayed.
*
*---------------------------------------------------------------------------
*/
static void
TurnOnHairs(Graph *graphPtr, Crosshairs *chPtr)
{
if (Tk_IsMapped(graphPtr->tkwin) && (!chPtr->visible)) {
if (!PointInGraph(graphPtr, chPtr->hotSpot.x, chPtr->hotSpot.y)) {
return; /* Coordinates are off the graph */
}
XDrawSegments(graphPtr->display, Tk_WindowId(graphPtr->tkwin),
chPtr->gc, chPtr->segArr, 2);
chPtr->visible = TRUE;
}
}
/*
*---------------------------------------------------------------------------
*
* ConfigureCrosshairs --
*
* Configures attributes of the crosshairs such as line width,
* dashes, and position. The crosshairs are first turned off
* before any of the attributes changes.
*
* Results:
* None
*
* Side Effects:
* Crosshair GC is allocated.
*
*---------------------------------------------------------------------------
*/
void
Blt_ConfigureCrosshairs(Graph *graphPtr)
{
XGCValues gcValues;
unsigned long gcMask;
GC newGC;
unsigned long int pixel;
Crosshairs *chPtr = graphPtr->crosshairs;
/*
* Turn off the crosshairs temporarily. This is in case the new
* configuration changes the size, style, or position of the lines.
*/
TurnOffHairs(graphPtr->tkwin, chPtr);
gcValues.function = GXxor;
if (graphPtr->plotBg == NULL) {
/* The graph's color option may not have been set yet */
pixel = WhitePixelOfScreen(Tk_Screen(graphPtr->tkwin));
} else {
pixel = Blt_BackgroundBorderColor(graphPtr->plotBg)->pixel;
}
gcValues.background = pixel;
gcValues.foreground = (pixel ^ chPtr->colorPtr->pixel);
gcValues.line_width = LineWidth(chPtr->lineWidth);
gcMask = (GCForeground | GCBackground | GCFunction | GCLineWidth);
if (LineIsDashed(chPtr->dashes)) {
gcValues.line_style = LineOnOffDash;
gcMask |= GCLineStyle;
}
newGC = Blt_GetPrivateGC(graphPtr->tkwin, gcMask, &gcValues);
if (LineIsDashed(chPtr->dashes)) {
Blt_SetDashes(graphPtr->display, newGC, &chPtr->dashes);
}
if (chPtr->gc != NULL) {
Blt_FreePrivateGC(graphPtr->display, chPtr->gc);
}
chPtr->gc = newGC;
/*
* Are the new coordinates on the graph?
*/
chPtr->segArr[0].x2 = chPtr->segArr[0].x1 = chPtr->hotSpot.x;
chPtr->segArr[0].y1 = graphPtr->bottom;
chPtr->segArr[0].y2 = graphPtr->top;
chPtr->segArr[1].y2 = chPtr->segArr[1].y1 = chPtr->hotSpot.y;
chPtr->segArr[1].x1 = graphPtr->left;
chPtr->segArr[1].x2 = graphPtr->right;
if (!chPtr->hidden) {
TurnOnHairs(graphPtr, chPtr);
}
}
void
Blt_EnableCrosshairs(Graph *graphPtr)
{
if (!graphPtr->crosshairs->hidden) {
TurnOnHairs(graphPtr, graphPtr->crosshairs);
}
}
void
Blt_DisableCrosshairs(Graph *graphPtr)
{
if (!graphPtr->crosshairs->hidden) {
TurnOffHairs(graphPtr->tkwin, graphPtr->crosshairs);
}
}
/*
*---------------------------------------------------------------------------
*
* UpdateCrosshairs --
*
* Update the length of the hairs (not the hot spot).
*
* Results:
* None.
*
*---------------------------------------------------------------------------
*/
void
Blt_UpdateCrosshairs(Graph *graphPtr)
{
Crosshairs *chPtr = graphPtr->crosshairs;
chPtr->segArr[0].y1 = graphPtr->bottom;
chPtr->segArr[0].y2 = graphPtr->top;
chPtr->segArr[1].x1 = graphPtr->left;
chPtr->segArr[1].x2 = graphPtr->right;
}
/*
*---------------------------------------------------------------------------
*
* Blt_DestroyCrosshairs --
*
* Results:
* None
*
* Side Effects:
* Crosshair GC is allocated.
*
*---------------------------------------------------------------------------
*/
void
Blt_DestroyCrosshairs(Graph *graphPtr)
{
if (graphPtr->crosshairs != NULL) {
Crosshairs *chPtr = graphPtr->crosshairs;
Blt_FreeOptions(configSpecs, (char *)chPtr, graphPtr->display, 0);
if (chPtr->gc != NULL) {
Blt_FreePrivateGC(graphPtr->display, chPtr->gc);
}
free(chPtr);
}
}
/*
*---------------------------------------------------------------------------
*
* Blt_CreateCrosshairs --
*
* Creates and initializes a new crosshair structure.
*
* Results:
* Returns TCL_ERROR if the crosshair structure can't be created,
* otherwise TCL_OK.
*
* Side Effects:
* Crosshair GC is allocated.
*
*---------------------------------------------------------------------------
*/
int
Blt_CreateCrosshairs(Graph *graphPtr)
{
Crosshairs *chPtr;
chPtr = calloc(1, sizeof(Crosshairs));
chPtr->hidden = TRUE;
chPtr->hotSpot.x = chPtr->hotSpot.y = -1;
graphPtr->crosshairs = chPtr;
if (Blt_ConfigureComponentFromObj(graphPtr->interp, graphPtr->tkwin,
"crosshairs", "Crosshairs", configSpecs, 0, (Tcl_Obj **)NULL,
(char *)chPtr, 0) != TCL_OK) {
return TCL_ERROR;
}
return TCL_OK;
}
/*
*---------------------------------------------------------------------------
*
* CgetOp --
*
* Queries configuration attributes of the crosshairs such as
* line width, dashes, and position.
*
* Results:
* A standard TCL result.
*
*---------------------------------------------------------------------------
*/
/* ARGSUSED */
static int
CgetOp(
Graph *graphPtr,
Tcl_Interp *interp,
int objc, /* Not used. */
Tcl_Obj *const *objv)
{
Crosshairs *chPtr = graphPtr->crosshairs;
return Blt_ConfigureValueFromObj(interp, graphPtr->tkwin, configSpecs,
(char *)chPtr, objv[3], 0);
}
/*
*---------------------------------------------------------------------------
*
* ConfigureOp --
*
* Queries or resets configuration attributes of the crosshairs
* such as line width, dashes, and position.
*
* Results:
* A standard TCL result.
*
* Side Effects:
* Crosshairs are reset.
*
*---------------------------------------------------------------------------
*/
static int
ConfigureOp(
Graph *graphPtr,
Tcl_Interp *interp,
int objc,
Tcl_Obj *const *objv)
{
Crosshairs *chPtr = graphPtr->crosshairs;
if (objc == 3) {
return Blt_ConfigureInfoFromObj(interp, graphPtr->tkwin, configSpecs,
(char *)chPtr, (Tcl_Obj *)NULL, 0);
} else if (objc == 4) {
return Blt_ConfigureInfoFromObj(interp, graphPtr->tkwin, configSpecs,
(char *)chPtr, objv[3], 0);
}
if (Blt_ConfigureWidgetFromObj(interp, graphPtr->tkwin, configSpecs,
objc - 3, objv + 3, (char *)chPtr, BLT_CONFIG_OBJV_ONLY) != TCL_OK) {
return TCL_ERROR;
}
Blt_ConfigureCrosshairs(graphPtr);
return TCL_OK;
}
/*
*---------------------------------------------------------------------------
*
* OnOp --
*
* Maps the crosshairs.
*
* Results:
* A standard TCL result.
*
* Side Effects:
* Crosshairs are reset if necessary.
*
*---------------------------------------------------------------------------
*/
/*ARGSUSED*/
static int
OnOp(
Graph *graphPtr,
Tcl_Interp *interp, /* Not used. */
int objc, /* Not used. */
Tcl_Obj *const *objv) /* Not used. */
{
Crosshairs *chPtr = graphPtr->crosshairs;
if (chPtr->hidden) {
TurnOnHairs(graphPtr, chPtr);
chPtr->hidden = FALSE;
}
return TCL_OK;
}
/*
*---------------------------------------------------------------------------
*
* OffOp --
*
* Unmaps the crosshairs.
*
* Results:
* A standard TCL result.
*
* Side Effects:
* Crosshairs are reset if necessary.
*
*---------------------------------------------------------------------------
*/
/*ARGSUSED*/
static int
OffOp(
Graph *graphPtr,
Tcl_Interp *interp, /* Not used. */
int objc, /* Not used. */
Tcl_Obj *const *objv) /* Not used. */
{
Crosshairs *chPtr = graphPtr->crosshairs;
if (!chPtr->hidden) {
TurnOffHairs(graphPtr->tkwin, chPtr);
chPtr->hidden = TRUE;
}
return TCL_OK;
}
/*
*---------------------------------------------------------------------------
*
* ToggleOp --
*
* Toggles the state of the crosshairs.
*
* Results:
* A standard TCL result.
*
* Side Effects:
* Crosshairs are reset.
*
*---------------------------------------------------------------------------
*/
/*ARGSUSED*/
static int
ToggleOp(
Graph *graphPtr,
Tcl_Interp *interp, /* Not used. */
int objc, /* Not used. */
Tcl_Obj *const *objv) /* Not used. */
{
Crosshairs *chPtr = graphPtr->crosshairs;
chPtr->hidden = (chPtr->hidden == 0);
if (chPtr->hidden) {
TurnOffHairs(graphPtr->tkwin, chPtr);
} else {
TurnOnHairs(graphPtr, chPtr);
}
return TCL_OK;
}
static Blt_OpSpec xhairOps[] =
{
{"cget", 2, CgetOp, 4, 4, "option",},
{"configure", 2, ConfigureOp, 3, 0, "?options...?",},
{"off", 2, OffOp, 3, 3, "",},
{"on", 2, OnOp, 3, 3, "",},
{"toggle", 1, ToggleOp, 3, 3, "",},
};
static int nXhairOps = sizeof(xhairOps) / sizeof(Blt_OpSpec);
/*
*---------------------------------------------------------------------------
*
* Blt_CrosshairsOp --
*
* User routine to configure crosshair simulation. Crosshairs
* are simulated by drawing line segments parallel to both axes
* using the XOR drawing function. The allows the lines to be
* erased (by drawing them again) without redrawing the entire
* graph. Care must be taken to erase crosshairs before redrawing
* the graph and redraw them after the graph is redraw.
*
* Results:
* The return value is a standard TCL result.
*
* Side Effects:
* Crosshairs may be drawn in the plotting area.
*
*---------------------------------------------------------------------------
*/
int
Blt_CrosshairsOp(
Graph *graphPtr,
Tcl_Interp *interp,
int objc,
Tcl_Obj *const *objv)
{
GraphCrosshairProc *proc;
proc = Blt_GetOpFromObj(interp, nXhairOps, xhairOps, BLT_OP_ARG2,
objc, objv, 0);
if (proc == NULL) {
return TCL_ERROR;
}
return (*proc) (graphPtr, interp, objc, objv);
}
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