Remove $Id$ tags, update URL's, and more

- remove obsolete svn '$Id$' tags from all source files
- update .fl files and generated files accordingly
- replace 'http://www.fltk.org' URL's with 'https://...'
- replace bug report URL 'str.php' with 'bugs.php'
- remove trailing whitespace
- fix other whitespace errors flagged by Git
- add and/or fix missing or wrong standard headers
- convert tabs to spaces in all source files

The only relevant code changes are in the fluid/ folder where
some .fl files and other source files were used to generate
the '$Id' headers and footers.

1 files changed, 23 insertions, 29 deletions

diff --git a/src/fl_arc.cxx b/src/fl_arc.cxx
index f234711f3..58857c811 100644
--- a/src/fl_arc.cxx
+++ b/src/fl_arc.cxx
@@ -1,6 +1,4 @@
 //
-// "$Id$"
-//
 // Arc functions for the Fast Light Tool Kit (FLTK).
 //
 // Copyright 1998-2016 by Bill Spitzak and others.
@@ -9,11 +7,11 @@
 // the file "COPYING" which should have been included with this file.  If this
 // file is missing or damaged, see the license at:
 //
-//     http://www.fltk.org/COPYING.php
+//     https://www.fltk.org/COPYING.php
 //
-// Please report all bugs and problems on the following page:
+// Please see the following page on how to report bugs and issues:
 //
-//     http://www.fltk.org/str.php
+//     https://www.fltk.org/bugs.php
 //
 
 /**
@@ -28,7 +26,7 @@
 #include <FL/fl_draw.H>
 #include <FL/math.h>
 
-// avoid problems with some platforms that don't 
+// avoid problems with some platforms that don't
 // implement hypot.
 static double _fl_hypot(double x, double y) {
   return sqrt(x*x + y*y);
@@ -52,35 +50,35 @@ static double _fl_hypot(double x, double y) {
 void Fl_Graphics_Driver::arc(double x, double y, double r, double start, double end) {
 
   // draw start point accurately:
-  
-  double A = start*(M_PI/180);		// Initial angle (radians)
-  double X =  r*cos(A);			// Initial displacement, (X,Y)
-  double Y = -r*sin(A);			//   from center to initial point
-  fl_vertex(x+X,y+Y);			// Insert initial point
+
+  double A = start*(M_PI/180);          // Initial angle (radians)
+  double X =  r*cos(A);                 // Initial displacement, (X,Y)
+  double Y = -r*sin(A);                 //   from center to initial point
+  fl_vertex(x+X,y+Y);                   // Insert initial point
 
   // Maximum arc length to approximate with chord with error <= 0.125
-  
+
   double epsilon; {
     double r1 = _fl_hypot(fl_transform_dx(r,0), // Horizontal "radius"
-		          fl_transform_dy(r,0));
+                          fl_transform_dy(r,0));
     double r2 = _fl_hypot(fl_transform_dx(0,r), // Vertical "radius"
-		          fl_transform_dy(0,r));
-		      
-    if (r1 > r2) r1 = r2;		// r1 = minimum "radius"
-    if (r1 < 2.) r1 = 2.;		// radius for circa 9 chords/circle
-    
-    epsilon = 2*acos(1.0 - 0.125/r1);	// Maximum arc angle
+                          fl_transform_dy(0,r));
+
+    if (r1 > r2) r1 = r2;               // r1 = minimum "radius"
+    if (r1 < 2.) r1 = 2.;               // radius for circa 9 chords/circle
+
+    epsilon = 2*acos(1.0 - 0.125/r1);   // Maximum arc angle
   }
-  A = end*(M_PI/180) - A;		// Displacement angle (radians)
-  int i = int(ceil(fabs(A)/epsilon));	// Segments in approximation
-  
+  A = end*(M_PI/180) - A;               // Displacement angle (radians)
+  int i = int(ceil(fabs(A)/epsilon));   // Segments in approximation
+
   if (i) {
-    epsilon = A/i;			// Arc length for equal-size steps
-    double cos_e = cos(epsilon);	// Rotation coefficients
+    epsilon = A/i;                      // Arc length for equal-size steps
+    double cos_e = cos(epsilon);        // Rotation coefficients
     double sin_e = sin(epsilon);
     do {
       double Xnew =  cos_e*X + sin_e*Y;
-		Y = -sin_e*X + cos_e*Y;
+                Y = -sin_e*X + cos_e*Y;
       fl_vertex(x + (X=Xnew), y + Y);
     } while (--i);
   }
@@ -90,7 +88,3 @@ void Fl_Graphics_Driver::arc(double x, double y, double r, double start, double
  \}
  \endcond
  */
-
-//
-// End of "$Id$".
-//