Changes to dial so that counter-clockwise motion is supported if you

set angle2 < angle1.  Deleted the unimplemented direction() control.
Fixed the documentation, this new code allows any 2 values for the
angles as long as abs(a-b)<=360.


git-svn-id: file:///fltk/svn/fltk/trunk@399 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

FL/Fl_Dial.H

@@ -1,5 +1,5 @@
 //
-// "$Id: Fl_Dial.H,v 1.6 1999/03/08 21:44:28 carl Exp $"
+// "$Id: Fl_Dial.H,v 1.7 1999/03/10 08:17:40 bill Exp $"
 //
 // Dial header file for the Fast Light Tool Kit (FLTK).
 //
@@ -35,13 +35,9 @@
 #define FL_LINE_DIAL	1
 #define FL_FILL_DIAL	2
 
-#define FL_DIAL_CW	0
-#define FL_DIAL_CCW	1
-
 class Fl_Dial : public Fl_Valuator {
 
   short a1,a2;
-  uchar direction_;
 
 protected:
 
@@ -54,14 +50,16 @@ public:
 
   FL_EXPORT int handle(int);
   FL_EXPORT Fl_Dial(int x,int y,int w,int h, const char *l = 0);
-  void angles(short a, short b);
-  void direction(uchar d) {direction_ = d;}
-  uchar direction() const {return direction_;}
+  short angle1() const {return a1;}
+  void angle1(short a) {a1 = a;}
+  short angle2() const {return a2;}
+  void angle2(short a) {a2 = a;}
+  void angles(short a, short b) {a1 = a; a2 = b;}
 
 };
 
 #endif
 
 //
-// End of "$Id: Fl_Dial.H,v 1.6 1999/03/08 21:44:28 carl Exp $".
+// End of "$Id: Fl_Dial.H,v 1.7 1999/03/10 08:17:40 bill Exp $".
 //

FL/forms.H

@@ -1,5 +1,5 @@
 //
-// "$Id: forms.H,v 1.6 1999/02/16 21:59:48 mike Exp $"
+// "$Id: forms.H,v 1.7 1999/03/10 08:17:40 bill Exp $"
 //
 // Forms emulation header file for the Fast Light Tool Kit (FLTK).
 //
@@ -618,10 +618,10 @@ inline void fl_get_dial_bounds(Fl_Widget* o, float* a, float* b) {
 inline void fl_set_dial_return(Fl_Widget* o, int i) {
   ((Fl_Dial*)o)->when((Fl_When)(i|FL_WHEN_RELEASE));}
 inline void fl_set_dial_angles(Fl_Widget* o, int a, int b) {
-  ((Fl_Dial*)o)->angles(a,b);}
+  ((Fl_Dial*)o)->angles(a, b);}
 //inline void fl_set_dial_cross(Fl_Widget* o, int);
-inline void fl_set_dial_direction(Fl_Widget* o, uchar d) {
-  ((Fl_Dial*)o)->direction(d);}
+// inline void fl_set_dial_direction(Fl_Widget* o, uchar d) {
+//   ((Fl_Dial*)o)->direction(d);}
 inline void fl_set_dial_step(Fl_Widget* o, double v) {
   ((Fl_Dial*)o)->step(v);}
 
@@ -841,5 +841,5 @@ inline void fl_draw() {Fl::flush();}
 #endif	/* define __FORMS_H__ */
 
 //
-// End of "$Id: forms.H,v 1.6 1999/02/16 21:59:48 mike Exp $".
+// End of "$Id: forms.H,v 1.7 1999/03/10 08:17:40 bill Exp $".
 //

documentation/Fl_Dial.html

@@ -23,6 +23,8 @@ single floating point value.
 <UL>
 <LI><A href=#Fl_Dial.Fl_Dial>Fl_Dial</A></LI>
 <LI><A href=#Fl_Dial.~Fl_Dial>~Fl_Dial</A></LI>
+<LI><A href=#Fl_Dial.angles>angle1</A></LI>
+<LI><A href=#Fl_Dial.angles>angle2</A></LI>
 <LI><A href=#Fl_Dial.angles>angles</A></LI>
 <LI><A href=#Fl_Dial.type>type</A></LI>
 </UL>
@@ -32,14 +34,22 @@ h, const char *label = 0)</A></H4>
 and label string. The default type is <TT>FL_NORMAL_DIAL</TT>. 
 <H4><A name=Fl_Dial.~Fl_Dial>virtual Fl_Dial::~Fl_Dial()</A></H4>
  Destroys the valuator. 
-<H4><A name=Fl_Dial.angles>void Fl_Dial::angles(short a, short b)</A></H4>
- Sets the angles used for the minimum and maximum values.  By default 
-these are 0 and 360, respectively.  (0 degrees is straight down and the
-angles progress clockwise.)  The angles specified should be greater than
-or equal to 0 and less than or equal to 360.  The progress of the dial always
-starts at the minimum angle and progresses clockwise to the maximum angle. 
-Currently, counter-clockwise progression is not supported (but user code can
-always use 1/value()).
+
+<H4>
+<A name=Fl_Dial.angles>
+short Fl_Dial::angle1() const;<br>
+void Fl_Dial::angle1(short);<br>
+short Fl_Dial::angle2() const;<br>
+void Fl_Dial::angle2(short);<br>
+void Fl_Dial::angles(short a, short b);
+</A>
+</H4>
+
+Sets the angles used for the minimum and maximum values.  The default
+values are 45 and 315 (0 degrees is straight down and the angles
+progress clockwise).  Normally angle1 is less than angle2, but if you
+reverse them the dial moves counter-clockwise.
+
 <H4><A name=Fl_Dial.type>type(uchar)</A></H4>
  Sets the type of the dial to: 
 <UL>

src/Fl_Dial.cxx

@@ -1,5 +1,5 @@
 //
-// "$Id: Fl_Dial.cxx,v 1.11 1999/03/10 00:13:52 carl Exp $"
+// "$Id: Fl_Dial.cxx,v 1.12 1999/03/10 08:17:42 bill Exp $"
 //
 // Circular dial widget for the Fast Light Tool Kit (FLTK).
 //
@@ -29,14 +29,7 @@
 #include <stdlib.h>
 #include <FL/math.h>
 
-// For XForms compatability, all angles are measured with 0 being straight
-// up and positive numbers going clockwise.
-
-void Fl_Dial::angles(short a, short b) {
-  a1=a;
-  a2=b;
-  if (a2 < a1) a2 += 360; // necessary for XForms compatability
-}
+// All angles are measured with 0 to the right and counter-clockwise
 
 void Fl_Dial::draw(int x, int y, int w, int h) {
   if (damage()&FL_DAMAGE_ALL) draw_box(box(), x, y, w, h, color());
@@ -50,7 +43,7 @@ void Fl_Dial::draw(int x, int y, int w, int h) {
     int foo = (box() > _FL_ROUND_UP_BOX && Fl::box_dx(box()));
     if (foo) {x--; y--; w+=2; h+=2;}
     fl_color(color());
-    fl_pie(x, y, w-1, h-1, 270-a1, 360+270-angle);
+    fl_pie(x, y, w-1, h-1, 270-a1, angle > a1 ? 360+270-angle : 270-360-angle);
     fl_color(selection_color());
     fl_pie(x, y, w-1, h-1, 270-angle, 270-a1);
     if (foo) {
@@ -66,15 +59,9 @@ void Fl_Dial::draw(int x, int y, int w, int h) {
   fl_push_matrix();
   fl_translate(x+w/2-.5, y+h/2-.5);
   fl_scale(w-1, h-1);
-/* CET - Why is this here?  This code is never reached!
-  if (type() == FL_FILL_DIAL) {
-    fl_rotate(225);
-    fl_begin_line(); fl_vertex(0, 0); fl_vertex(.5, 0); fl_end_line();
-  }
-*/
   fl_rotate(45-angle);
   fl_color(selection_color());
-  if (type() == FL_LINE_DIAL) {
+  if (type()) { // FL_LINE_DIAL
     fl_begin_polygon();
     fl_vertex(0.0,   0.0);
     fl_vertex(-0.04, 0.0);
@@ -106,24 +93,20 @@ 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();
     int mx = Fl::event_x()-x-w/2;
     int my = Fl::event_y()-y-h/2;
     if (!mx && !my) return 1;
-    angle = atan2((float)-my, (float)-mx) + M_PI;
-    angle = (angle*360) / (2*M_PI) + 270;
+    double angle = 270-atan2((float)-my, (float)mx)*180/M_PI;
+    double oldangle = (a2-a1)*(value()-minimum())/(maximum()-minimum()) + a1;
     while (angle < oldangle-180) angle += 360;
     while (angle > oldangle+180) angle -= 360;
-    if (angle <= a1) {
+    double val;
+    if ((a1<a2) ? (angle <= a1) : (angle >= a1)) {
       val = minimum();
-    } else if (angle >= a2) {
+    } else if ((a1<a2) ? (angle >= a2) : (angle <= a2)) {
       val = maximum();
     } else {
       val = minimum() + (maximum()-minimum())*(angle-a1)/(a2-a1);
-      last = angle;
     }
     handle_drag(clamp(round(val)));
   } return 1;
@@ -143,9 +126,10 @@ Fl_Dial::Fl_Dial(int x, int y, int w, int h, const char* l)
   : Fl_Valuator(x, y, w, h, l) {
   box(FL_OVAL_BOX);
   selection_color(FL_INACTIVE_COLOR); // was 37
-  angles(0,360);
+  a1 = 45;
+  a2 = 315;
 }
 
 //
-// End of "$Id: Fl_Dial.cxx,v 1.11 1999/03/10 00:13:52 carl Exp $".
+// End of "$Id: Fl_Dial.cxx,v 1.12 1999/03/10 08:17:42 bill Exp $".
 //

test/valuators.fl

@@ -147,7 +147,7 @@ fflush(stdout);}
       callback {printf("%g      \\r",o->value());
 fflush(stdout);}
       xywh {475 280 65 65} type Fill color 10 selection_color 1 labelsize 8
-      code0 {o->angles(45,315);}
+      code0 {o->angles(0,360);}
       code1 {o->value(1.0);}
     }
     Fl_Box {} {