1 files changed, 100 insertions, 0 deletions
diff --git a/src/intcgm/circle.c b/src/intcgm/circle.c
new file mode 100644
index 0000000..4f54fed
--- /dev/null
+++ b/src/intcgm/circle.c
@@ -0,0 +1,100 @@
+#include <stdio.h>
+#include <math.h>
+
+#include <cd.h>
+
+#include "list.h"
+#include "types.h"
+#include "intcgm.h"
+#include "intcgm6.h"
+
+#include "circle.h"
+
+#define DIM 360
+
+#ifndef PI
+#define PI 3.14159265358979323846
+#endif
+
+#define PI180 PI/180.
+#define TWOPI 2*PI
+#define VARCS TWOPI/32.
+
+int cgm_poly_circle ( double xc, double yc, double radius, double angi, double angf, int fechado )
+{
+ double coseno, seno;
+ double xs, ys;
+ 
+ coseno = cos (VARCS);
+ seno   = sin (VARCS);
+
+ xs = radius * cos(angi);
+ ys = radius * sin(angi);
+
+ cdCanvasBegin(intcgm_canvas,  cgm_setintstyle(intcgm_fill_att.int_style) );
+
+ if ( fechado==CLOSED_PIE ) cdCanvasVertex (intcgm_canvas,  cgm_vdcx2canvas(xc), cgm_vdcy2canvas(yc) );
+
+ cdCanvasVertex (intcgm_canvas,  cgm_vdcx2canvas(xc+xs), cgm_vdcy2canvas(yc+ys) );
+
+ while ( (angi+VARCS) < angf )
+  {
+   double xe = xs;
+   xs = xs * coseno - ys * seno;
+   ys = ys * coseno + xe * seno;
+   cdCanvasVertex (intcgm_canvas,  cgm_vdcx2canvas(xc+xs), cgm_vdcy2canvas(yc+ys) );
+   angi += VARCS;
+  }
+
+ cdCanvasVertex (intcgm_canvas,  cgm_vdcx2canvas(xc+radius*cos(angf)), cgm_vdcy2canvas(yc+radius*sin(angf)) );
+
+ cdCanvasEnd(intcgm_canvas);
+
+ return 0;
+}
+
+int cgm_line_circle ( double xc, double yc, double radius, double angi, double angf, int fechado )
+{
+ double coseno, seno;
+ double xant, yant, firstx, firsty;
+ double xs, ys;
+
+ /* GERA O DESENHO DO CIRCULO/ARCO */
+
+ coseno = cos (VARCS);
+ seno   = sin (VARCS);
+
+ xs = radius * cos(angi);
+ ys = radius * sin(angi);
+
+ if ( fechado==CLOSED_PIE )
+  cdCanvasLine (intcgm_canvas,  cgm_vdcx2canvas(xc), cgm_vdcy2canvas(yc), cgm_vdcx2canvas(xc+xs), cgm_vdcy2canvas(yc+ys) );
+
+ xant = firstx = xc+xs;
+ yant = firsty = yc+ys;
+
+ while ( (angi+VARCS) < angf )
+  {
+   double xe = xs;
+   xs = xs * coseno - ys * seno;
+   ys = ys * coseno + xe * seno;
+   cdCanvasLine (intcgm_canvas,  cgm_vdcx2canvas(xant), cgm_vdcy2canvas(yant), cgm_vdcx2canvas(xc+xs), cgm_vdcy2canvas(yc+ys) );
+   xant = xc+xs;
+   yant = yc+ys;
+   angi += VARCS;
+  }
+
+ cdCanvasLine (intcgm_canvas,  cgm_vdcx2canvas(xant), cgm_vdcy2canvas(yant),
+          cgm_vdcx2canvas(xc+radius*cos(angf)), cgm_vdcy2canvas(yc+radius*sin(angf)) );
+
+ xant = xc+radius*cos(angf);
+ yant = yc+radius*sin(angf);
+
+ if ( fechado==CLOSED_PIE )
+  cdCanvasLine (intcgm_canvas,  cgm_vdcx2canvas(xant), cgm_vdcy2canvas(yant), cgm_vdcx2canvas(xc), cgm_vdcy2canvas(yc) );
+ else if ( fechado==CLOSED_CHORD )
+  cdCanvasLine (intcgm_canvas,  cgm_vdcx2canvas(xant), cgm_vdcy2canvas(yant), cgm_vdcx2canvas(firstx), cgm_vdcy2canvas(firsty) );
+
+ return 0;
+}
+