QT: Fixed the gradient when filling an arc with a gradient.

xtt/lib/glow/qt/glow_draw_qt.cqt

@@ -2815,11 +2815,10 @@ int GlowDrawQt::gradient_fill_arc(GlowWind* wind, int x, int y, int w, int h,
     return 1;
   }
 
-  while (angle1 >= 360) {
-    angle1 -= 360;
-  }
-  while (angle1 < 360) {
-    angle1 += 360;
+  if (angle1 >= 360) {
+    angle1 = angle1 - angle1 / 360 * 360;
+  } else if (angle1 < 0) {
+    angle1 = angle1 + (-angle1 / 360 + 1) * 360;
   }
 
   unique_ptr<QPainter> painter = new QPainter(ww->buffer);
@@ -2829,18 +2828,16 @@ int GlowDrawQt::gradient_fill_arc(GlowWind* wind, int x, int y, int w, int h,
   }
 
   QGradient* pat;
-  if (!gradient_create_pattern(-1, -1, 2, 2, d0, d1, d2, gradient, &pat)) {
+  if (!gradient_create_pattern(x, y, w, h, d0, d1, d2, gradient, &pat)) {
     return 0;
   }
 
-  painter->translate(x + w / 2.0, y + h / 2.0);
-  painter->scale(w / 2.0, h / 2.0);
   QPainterPath path;
   if (!(angle2 == 360 || angle2 == 180))
-    path.moveTo(0, 0);
-  path.arcTo(-1, -1, 2, 2, angle1, angle2);
+    path.moveTo(x + w / 2.0, y + h / 2.0);
+  path.arcTo(x, y, w, h, angle1, angle2);
   if (!(angle2 == 360 || angle2 == 180))
-    path.moveTo(0, 0);
+    path.moveTo(x + w / 2.0, y + h / 2.0);
   painter->fillPath(path, *pat);
 
   delete pat;