ChartObject WebFAQ - Q11

    :
static void Unzoom();
/**
 ** Other Global Variables
 **/
Widget        edit;
Object        chart;
Object        *list;

/**
 ** Translations
 **/
static char zoom_translations[] =
"None &ltBtn1Down> TraverseCurrent() InitAreaSelection(callback) \n\
 Ctrl &ltBtn1Down> Unzoom() ";

XtTranslations zoom_translations_parsed;

static void
Unzoom(Widget widget, XEvent *event, String *params, int *num_params)
{
  Object  chart, plot;
  int     count;
  register int i;

  if (list) XtFree((char *)list);

  /*
   * Retrieve object list to find ID of chart
   */
   list = XintEditObjectGetList(edit, &count);

   for (i=0; i&ltcount; i++)
     if (XintIsChart(list[i])) break;

   if (i > count) return;

   plot = XintChartGetComponent(list[i], XintCHART_COMPONENT_PLOT);

  /*
   * Return if it is a 3D plot
   */
   if (XintIsPlot3D(plot)) return;

   XtVaSetValues((Widget) plot, XmNxLimits, NULL, XmNyLimits, NULL, NULL);
}
static XtActionsRec app_actions[] = {
   {"Unzoom", (XtActionProc) Unzoom}
};


/***
 *** ZoomCallback
 ***/
static void ZoomCallback(widget, data, cb)
  Widget widget;
  XtPointer data;
  XintEditObjectAreaSelectionCallbackStruct *cb;
{
  if (chart == NULL) return;

  XintChartZoom(chart, cb-&gtx, cb-&gty, cb-&gtwidth, cb-&gtheight);

}

main(argc, argv)
  int     argc;
  char    *argv[];
{
  :
  :
  XtAppAddActions(app_context, app_actions, XtNumber(app_actions));

 /*
  * Parse translations
  */
  zoom_translations_parsed = XtParseTranslationTable(zoom_translations);
  :
  :
  XtOverrideTranslations(edit, zoom_translations_parsed);
 /*
  * Register callback that is called after user has selected a rectangle
  * when zoom is on
  */
  XtAddCallback(edit, XmNareaSelectionCallback,
                (XtCallbackProc) ZoomCallback, NULL);
  :
  :

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