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/*
* Smithsonian Astrophysical Observatory, Cambridge, MA, USA
* This code has been modified under the terms listed below and is made
* available under the same terms.
*/
/*
* 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 "bltInt.h"
#include "bltGraph.h"
#include "bltOp.h"
#include "bltConfig.h"
struct _Crosshairs {
Tk_OptionTable optionTable;
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 NULL
#define DEF_HAIRS_FOREGROUND black
#define DEF_HAIRS_LINE_WIDTH "0"
#define DEF_HAIRS_HIDE "yes"
#define DEF_HAIRS_POSITION NULL
static Tk_OptionSpec optionSpecs[] = {
{TK_OPTION_COLOR, "-color", "color", "Color",
DEF_HAIRS_FOREGROUND,
-1, Tk_Offset(Crosshairs, colorPtr), 0, NULL, 0},
{TK_OPTION_CUSTOM, "-dashes", "dashes", "Dashes",
DEF_HAIRS_DASHES,
-1, Tk_Offset(Crosshairs, dashes), TK_OPTION_NULL_OK, &dashesObjOption, 0},
{TK_OPTION_BOOLEAN, "-hide", "hide", "Hide",
DEF_HAIRS_HIDE,
-1, Tk_Offset(Crosshairs, hidden), 0, NULL, 0},
{TK_OPTION_PIXELS, "-linewidth", "lineWidth", "Linewidth",
DEF_HAIRS_LINE_WIDTH,
-1, Tk_Offset(Crosshairs, lineWidth), 0, NULL, 0},
{TK_OPTION_CUSTOM, "-position", "position", "Position",
DEF_HAIRS_POSITION,
-1, Tk_Offset(Crosshairs, hotSpot), 0, &pointObjOption, 0},
{TK_OPTION_END, NULL, NULL, NULL, NULL, -1, 0, 0, NULL, 0}
};
static int CrosshairsObjConfigure(Tcl_Interp* interp, Graph* graphPtr,
int objc, Tcl_Obj* const objv[]);
static void ConfigureCrosshairs(Graph *graphPtr);
static void TurnOffHairs(Tk_Window tkwin, Crosshairs *chPtr);
static void TurnOnHairs(Graph *graphPtr, Crosshairs *chPtr);
int Blt_CreateCrosshairs(Graph* graphPtr)
{
Crosshairs* chPtr = calloc(1, sizeof(Crosshairs));
chPtr->optionTable = Tk_CreateOptionTable(graphPtr->interp, optionSpecs);
chPtr->hidden = TRUE;
chPtr->hotSpot.x = chPtr->hotSpot.y = -1;
graphPtr->crosshairs = chPtr;
return TCL_OK;
}
int Blt_ConfigureObjCrosshairs(Graph* graphPtr,
int objc, Tcl_Obj* const objv[])
{
Crosshairs* chPtr = graphPtr->crosshairs;
return Tk_InitOptions(graphPtr->interp, (char*)chPtr, chPtr->optionTable,
graphPtr->tkwin);
}
static Blt_OpSpec xhairOps[];
static int nXhairOps;
typedef int (GraphCrosshairProc)(Graph* graphPtr, Tcl_Interp* interp,
int objc, Tcl_Obj* const objv[]);
int Blt_CrosshairsOp(Graph* graphPtr, Tcl_Interp* interp,
int objc, Tcl_Obj* const objv[])
{
GraphCrosshairProc* proc = Blt_GetOpFromObj(interp, nXhairOps, xhairOps,
BLT_OP_ARG2, objc, objv, 0);
if (proc == NULL)
return TCL_ERROR;
return (*proc)(graphPtr, interp, objc, objv);
}
static int CgetOp(Graph* graphPtr, Tcl_Interp* interp,
int objc, Tcl_Obj* const objv[])
{
if (objc != 4) {
Tcl_WrongNumArgs(interp, 2, objv, "cget option");
return TCL_ERROR;
}
Crosshairs* chPtr = graphPtr->crosshairs;
Tcl_Obj* objPtr = Tk_GetOptionValue(interp, (char*)chPtr,
chPtr->optionTable,
objv[3], graphPtr->tkwin);
if (objPtr == NULL)
return TCL_ERROR;
else
Tcl_SetObjResult(interp, objPtr);
return TCL_OK;
}
static int ConfigureOp(Graph* graphPtr, Tcl_Interp* interp,
int objc, Tcl_Obj* const objv[])
{
Crosshairs* chPtr = graphPtr->crosshairs;
if (objc <= 4) {
Tcl_Obj* objPtr = Tk_GetOptionInfo(graphPtr->interp, (char*)chPtr,
chPtr->optionTable,
(objc == 4) ? objv[3] : NULL,
graphPtr->tkwin);
if (objPtr == NULL)
return TCL_ERROR;
else
Tcl_SetObjResult(interp, objPtr);
return TCL_OK;
}
else
return CrosshairsObjConfigure(interp, graphPtr, objc-3, objv+3);
}
static int CrosshairsObjConfigure(Tcl_Interp *interp, Graph* graphPtr,
int objc, Tcl_Obj* const objv[])
{
Crosshairs* chPtr = graphPtr->crosshairs;
Tk_SavedOptions savedOptions;
int mask =0;
int error;
Tcl_Obj* errorResult;
for (error=0; error<=1; error++) {
if (!error) {
if (Tk_SetOptions(interp, (char*)chPtr, chPtr->optionTable,
objc, objv, graphPtr->tkwin, &savedOptions, &mask)
!= TCL_OK)
continue;
}
else {
errorResult = Tcl_GetObjResult(interp);
Tcl_IncrRefCount(errorResult);
Tk_RestoreSavedOptions(&savedOptions);
}
ConfigureCrosshairs(graphPtr);
break;
}
if (!error) {
Tk_FreeSavedOptions(&savedOptions);
return TCL_OK;
}
else {
Tcl_SetObjResult(interp, errorResult);
Tcl_DecrRefCount(errorResult);
return TCL_ERROR;
}
}
static void ConfigureCrosshairs(Graph *graphPtr)
{
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);
XGCValues gcValues;
gcValues.function = GXxor;
unsigned long int pixel = Tk_3DBorderColor(graphPtr->plotBg)->pixel;
gcValues.background = pixel;
gcValues.foreground = (pixel ^ chPtr->colorPtr->pixel);
gcValues.line_width = LineWidth(chPtr->lineWidth);
unsigned long gcMask =
(GCForeground | GCBackground | GCFunction | GCLineWidth);
if (LineIsDashed(chPtr->dashes)) {
gcValues.line_style = LineOnOffDash;
gcMask |= GCLineStyle;
}
GC 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_DeleteCrosshairs(Graph* graphPtr)
{
Crosshairs *chPtr = graphPtr->crosshairs;
if (chPtr != NULL)
Tk_FreeConfigOptions((char*)chPtr, chPtr->optionTable, graphPtr->tkwin);
}
void Blt_DestroyCrosshairs(Graph* graphPtr)
{
Crosshairs *chPtr = graphPtr->crosshairs;
if (chPtr != NULL) {
if (chPtr->gc != NULL)
Blt_FreePrivateGC(graphPtr->display, chPtr->gc);
free(chPtr);
}
}
// Widget commands
static int OnOp(Graph *graphPtr, Tcl_Interp *interp,
int objc, Tcl_Obj *const *objv)
{
Crosshairs *chPtr = graphPtr->crosshairs;
if (chPtr->hidden) {
TurnOnHairs(graphPtr, chPtr);
chPtr->hidden = FALSE;
}
return TCL_OK;
}
static int OffOp(Graph *graphPtr, Tcl_Interp *interp,
int objc, Tcl_Obj *const *objv)
{
Crosshairs *chPtr = graphPtr->crosshairs;
if (!chPtr->hidden) {
TurnOffHairs(graphPtr->tkwin, chPtr);
chPtr->hidden = TRUE;
}
return TCL_OK;
}
static int ToggleOp(Graph *graphPtr, Tcl_Interp *interp,
int objc, Tcl_Obj *const *objv)
{
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);
// Support
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;
}
}
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;
}
}
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);
}
}
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