remove compiler warnings by explicit casting double -> int etc.

ChangeLog

@@ -1,3 +1,9 @@
+2011-06-30  Robert Larice
+ * src/frontend/plotting/x11.c :
+   remove compiler warnings by explicit casting double -> int etc.
+     extend Holger's commit from 2011-06-11 to x11.c
+     FIXME, consider rounding towards nearest instead of towards zero
+
 2011-06-30  Robert Larice
  * src/spicelib/devices/hisim2/hsm2eval.c ,
  * src/spicelib/devices/hisimhv/hsmhveval.c :

src/frontend/plotting/x11.c

@@ -539,8 +539,8 @@ X11_Arc(int x0, int y0, int radius, double theta, double delta_theta)
     }
 
     if (DEVDEP(currentgraph).isopen) {
-	t1 = 64 * (180.0 / M_PI) * theta;
-	t2 = 64 * (180.0 / M_PI) * delta_theta;
+	t1 = (int) (64 * (180.0 / M_PI) * theta);
+	t2 = (int) (64 * (180.0 / M_PI) * delta_theta);
 	if (t2 == 0)
 		return 0;
 	XDrawArc(display, DEVDEP(currentgraph).window, DEVDEP(currentgraph).gc,