OK, take a look at this one, it clamps the sweep of degrees within the range
you mentioned.
=== modified file 'common/common_plotHPGL_functions.cpp'
--- common/common_plotHPGL_functions.cpp 2012-10-13 18:54:33 +0000
+++ common/common_plotHPGL_functions.cpp 2013-02-01 21:56:54 +0000
@@ -373,6 +373,31 @@
}
+/**
+ * Function NormalizeDegrees
+ * limits @a aDegrees within the range @a lower <= @a aDegrees <= @a upper. It will work
+ * on temporary expressions, since they are evaluated only once, and it should work
+ * on most if not all numeric types, string types, or any type for which "operator < ()"
+ * is present. The arguments are accepted in this order so you can remember the
+ * expression as a memory aid:
+ * <p>
+ * result is: lower <= value <= upper
+ */
+template <typename T> inline T NormalizeDegrees( T lower, T aDegrees, T upper )
+{
+ wxASSERT( lower <= upper );
+
+ while( aDegrees < lower )
+ aDegrees += 360;
+
+ while( upper < aDegrees )
+ aDegrees -= 360;
+
+ return aDegrees;
+}
+// @todo move this to some place more useful, like fctsys.h
+
+
/* Plot an arc:
* Center = center coord
* Stangl, endAngle = angle of beginning and end
@@ -385,7 +410,7 @@
FILL_T fill, int width )
{
wxASSERT( outputFile );
- double angle;
+ double degrees;
if( radius <= 0 )
return;
@@ -393,14 +418,17 @@
DPOINT centre_dev = userToDeviceCoordinates( centre );
if( plotMirror )
- angle = (StAngle - EndAngle) / 10.0;
+ degrees = (StAngle - EndAngle) / 10.0;
else
- angle = (EndAngle - StAngle) / 10.0;
+ degrees = (EndAngle - StAngle) / 10.0;
+
+ degrees = NormalizeDegrees( -180.0, degrees, +179.0 );
// Calculate start point,
wxPoint cmap;
- cmap.x = (int) ( centre.x + ( radius * cos( RAD2DEG( StAngle / 10.0 ) ) ) );
- cmap.y = (int) ( centre.y - ( radius * sin( RAD2DEG( StAngle / 10.0 ) ) ) );
+ cmap.x = int( centre.x + ( radius * cos( DEG2RAD( StAngle / 10.0 ) ) ) );
+ cmap.y = int( centre.y - ( radius * sin( DEG2RAD( StAngle / 10.0 ) ) ) );
+
DPOINT cmap_dev = userToDeviceCoordinates( cmap );
fprintf( outputFile,
@@ -409,7 +437,7 @@
cmap_dev.y,
centre_dev.x,
centre_dev.y );
- fprintf( outputFile, "%.0f", angle );
+ fprintf( outputFile, "%.0f", degrees );
fprintf( outputFile, ";PU;\n" );
PenFinish();
}
@@ -478,7 +506,7 @@
double rsize = userToDeviceSize( radius );
- fprintf( outputFile, "PA %.0f,%.0fd;CI %.0f;\n",
+ fprintf( outputFile, "PA %.0f,%.0f;CI %.0f;\n",
pos_dev.x, pos_dev.y, rsize );
if( trace_mode == FILLED ) // Plot in filled mode.
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