Fix a number of egregious conversions of angular measure.

anachrocomputer · Jul 3, 2018 · 39ac98f · 39ac98f
1 parent f64848d
commit 39ac98f
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Showing 5 changed files with 8 additions and 6 deletions.
diff --git a/fraserspiral.c b/fraserspiral.c
@@ -7,6 +7,7 @@
 #include <unistd.h>
 #include "hpgllib.h"
 
+#define DEGREES   (180.0 / M_PI)
 
 void ringoshapes (double x0, double y0, double radius, int nshapes);
 
@@ -90,6 +91,6 @@ void ringoshapes (double x0, double y0, double radius, int nshapes)
       xc = (d * cos (theta + (M_PI / 2.0))) + x0;
       yc = (d * sin (theta + (M_PI / 2.0))) + y0;
 
-      arc (xc, yc, (delta * 1.2) * 57.295);
+      arc (xc, yc, (delta * 1.2) * DEGREES);
    }
 }
diff --git a/hyp.c b/hyp.c
@@ -21,7 +21,7 @@ void pencolr (int c);
 #define MAXY (7600.0)
 #endif   /* A3 */
 
-#define DEG_TO_RAD (1.0 / 57.295)
+#define DEG_TO_RAD  (M_PI / 180.0)
 
 double X0, Y0;
 double Rad;

diff --git a/lobe.c b/lobe.c
@@ -4,7 +4,7 @@
 #include <stdio.h>
 #include <math.h>
 
-#define RADIANS   (0.017453292)
+#define RADIANS  (M_PI / 180.0)
 
 #define BLACK     (1)
 #define RED       (2)

diff --git a/spiralsq.c b/spiralsq.c
@@ -7,6 +7,7 @@
 #include <unistd.h>
 #include "hpgllib.h"
 
+#define RADIANS  (M_PI / 180.0)
 
 void spiral (double cx, double cy, double radius, double ang, int n);
 double diamondsquare (double x0, double y0, double side);
@@ -71,7 +72,7 @@ int main (int argc, char * const argv[])
          slant = -20.0;
 
       r = radius * (i + 1.5);
-      ringoboxes2 (xc, yc, r, 18 * (i + 1), 1, 0, slant / 57.295);
+      ringoboxes2 (xc, yc, r, 18 * (i + 1), 1, 0, slant * RADIANS);
    }
 
    pencolr (1);
@@ -84,7 +85,7 @@ int main (int argc, char * const argv[])
          slant = -20.0;
 
       r = radius * (i + 1.5);
-      ringoboxes2 (xc, yc, r, 18 * (i + 1), 1, 1, slant / 57.295);
+      ringoboxes2 (xc, yc, r, 18 * (i + 1), 1, 1, slant * RADIANS);
    }
 
    plotend ();

diff --git a/turtle.c b/turtle.c
@@ -14,7 +14,7 @@
 #include "turtle.h"
 #include <math.h>
 
-#define RADIANS   (0.017453292)
+#define RADIANS  (M_PI / 180.0)
 #define ETX (0x03)
 
 static int Pltdev = DEV_NONE;