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Made arc angles counterclockwise on the GTK+ backend and fixed the sun in the Direct2D geometries howto.

This commit is contained in:
Pietro Gagliardi 2015-10-09 23:13:15 -04:00
parent 50f03eca14
commit 3cbc3f3c67
2 changed files with 6 additions and 6 deletions
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2
test/drawtests.c
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@ -554,7 +554,7 @@ static void drawD2DPathGeometries(uiAreaDrawParams *p)
sun = uiDrawNewPath(uiDrawFillModeWinding); sun = uiDrawNewPath(uiDrawFillModeWinding);
uiDrawPathNewFigureWithArc(sun, uiDrawPathNewFigureWithArc(sun,
440.0, 255, (440.0 - 270.0) / 2 + 270.0, 255,
85, 85,
0, M_PI); 0, M_PI);
uiDrawPathCloseFigure(sun); uiDrawPathCloseFigure(sun);

10
unix/draw.c
View File

@ -152,14 +152,14 @@ static void runPath(uiDrawPath *p, cairo_t *cr)
cairo_new_sub_path(cr); cairo_new_sub_path(cr);
// fall through // fall through
case arcTo: case arcTo:
// the Windows AngleArc() function only goes counterclockwise, so our uiDrawArc() function does too // cairo_arc() and cairo_arc_negative() only go clockwise
// simulate it in cairo by drawing a negative arc from end to start // TODO explain why this works
cairo_arc_negative(cr, cairo_arc(cr,
piece->d[0], piece->d[0],
piece->d[1], piece->d[1],
piece->d[2], piece->d[2],
piece->d[3] + piece->d[4], -(piece->d[3] + piece->d[4]),
piece->d[3]); -(piece->d[3]));
break; break;
case lineTo: case lineTo:
cairo_line_to(cr, piece->d[0], piece->d[1]); cairo_line_to(cr, piece->d[0], piece->d[1]);