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Updated Fl_Dial to use atan2() to avoid possible math errors and reduce

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code size.


git-svn-id: file:///fltk/svn/fltk/trunk@277 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Michael R Sweet 1999-02-16 17:23:55 +00:00
parent 7b82bc3509
commit 18312d3c1f
1 changed files with 3 additions and 11 deletions
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14
src/Fl_Dial.cxx
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@ -1,5 +1,5 @@
// //
// "$Id: Fl_Dial.cxx,v 1.5 1999/01/07 19:17:19 mike Exp $" // "$Id: Fl_Dial.cxx,v 1.6 1999/02/16 17:23:55 mike Exp $"
// //
// Circular dial widget for the Fast Light Tool Kit (FLTK). // Circular dial widget for the Fast Light Tool Kit (FLTK).
// //
@ -101,15 +101,7 @@ int Fl_Dial::handle(int event, int x, int y, int w, int h) {
int mx = Fl::event_x()-x-w/2; int mx = Fl::event_x()-x-w/2;
int my = Fl::event_y()-y-h/2; int my = Fl::event_y()-y-h/2;
if (!mx && !my) return 1; if (!mx && !my) return 1;
if (abs(mx) > abs(my)) { angle = atan2(-my, -mx) + 0.25 * M_PI;
angle = atan(-(double)my/mx);
if (mx>0) angle = 1.25*M_PI - angle;
else angle = 0.25*M_PI - angle;
} else {
angle = atan(-(double)mx/my);
if (my<0) angle = 0.75*M_PI + angle;
else angle = -0.25*M_PI + angle;
}
if (angle<(-0.25*M_PI)) angle += 2.0*M_PI; if (angle<(-0.25*M_PI)) angle += 2.0*M_PI;
val = minimum() + (maximum()-minimum())*angle/(1.5*M_PI); val = minimum() + (maximum()-minimum())*angle/(1.5*M_PI);
if (fabs(val-value()) < (maximum()-minimum())/2.0) if (fabs(val-value()) < (maximum()-minimum())/2.0)
@ -134,5 +126,5 @@ Fl_Dial::Fl_Dial(int x, int y, int w, int h, const char* l)
} }
// //
// End of "$Id: Fl_Dial.cxx,v 1.5 1999/01/07 19:17:19 mike Exp $". // End of "$Id: Fl_Dial.cxx,v 1.6 1999/02/16 17:23:55 mike Exp $".
// //