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Fixes to Fl_Dial so it stops moving when you drag to ends of region.

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git-svn-id: file:///fltk/svn/fltk/trunk@379 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Bill Spitzak 1999-03-09 07:26:28 +00:00
parent 95e27d43f1
commit 92ff32aa80
1 changed files with 9 additions and 7 deletions
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16
src/Fl_Dial.cxx
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@ -1,5 +1,5 @@
//
// "$Id: Fl_Dial.cxx,v 1.8 1999/03/08 21:44:30 carl Exp $"
// "$Id: Fl_Dial.cxx,v 1.9 1999/03/09 07:26:28 bill Exp $"
//
// Circular dial widget for the Fast Light Tool Kit (FLTK).
//
@ -104,6 +104,7 @@ int Fl_Dial::handle(int event, int x, int y, int w, int h) {
case FL_PUSH:
handle_push();
case FL_DRAG: {
double oldangle = (a2-a1)*(value()-minimum())/(maximum()-minimum()) + a1;
double angle;
static double last = 0.0;
double val = value();
@ -112,11 +113,12 @@ int Fl_Dial::handle(int event, int x, int y, int w, int h) {
if (!mx && !my) return 1;
angle = atan2((float)-my, (float)-mx) + M_PI;
angle = (angle*360) / (2*M_PI) + 90;
if (angle >= 360.0) angle -= 360.0;
if (a2 >= 360 && angle <= (a2-360)) angle += 360;
if (angle < a1 || angle > a2) {
if ((last - a1) < (a2 - last)) val = minimum();
else val = maximum();
while (angle < oldangle-180) angle += 360;
while (angle > oldangle+180) angle -= 360;
if (angle <= a1) {
val = minimum();
} else if (angle >= a2) {
val = maximum();
} else {
val = minimum() + (maximum()-minimum())*(angle-a1)/(a2-a1);
last = angle;
@ -143,5 +145,5 @@ Fl_Dial::Fl_Dial(int x, int y, int w, int h, const char* l)
}
//
// End of "$Id: Fl_Dial.cxx,v 1.8 1999/03/08 21:44:30 carl Exp $".
// End of "$Id: Fl_Dial.cxx,v 1.9 1999/03/09 07:26:28 bill Exp $".
//