fixup! Generalize Text::angle() logic

qucs/element.cpp

@@ -86,22 +86,15 @@ double Text::angle() const {
  // of mCos and mSin completely, so they're kept as is and their
  // "degrees" equivalent is calculated when the text needs to be drawn.
 
- const double radians = std::acos(mCos);
- // convert from radians to degrees and normalize
- const double degrees = std::remainder(
- (radians * 180.0) / 3.14159265 /* Pi */, 360.0 /* Full circle */);
-
- // Above we've found the angle in degrees from a cosinus value.
- // A single cosinus value corresponds to two angles. If sinus is positive
- // the angle is in upper half of a circle. If sinus in negative, then
- // in lower half.
- //
- // At the same time QPainter::rotate() rotates *clockwise*, so if you
- // want a text to have rotation angle of 45° (towards up-right direction),
+ const double radians = std::atan2(mSin, mCos);
+ const double degrees = (radians * 180.0) / 3.14159265 /* Pi */;
+
+ // QPainter::rotate() rotates *clockwise*, so if you want a text
+ // to have rotation angle of 45° (towards up-right direction),
  // then the -45° has to be passed to QPainter::rotate().
  //
  // QPainter::rotate() is called in Text::draw
- return mSin < 0 ? degrees : -degrees;
+ return -degrees;
 }