How to erase the intersecting part of the two rectangles in Qt? -


i developing speech bubble project. using frameless qdialog wherein painted 2 elliptical rectangles in intersecting way shown below.

a picture of problem

how remove intersecting part here? have marked part in image.

i new qt. code is: 

qpainter painter(this); painter.save(); painter.setrenderhint(qpainter::antialiasing);  qpen pen(qcolor(65, 167, 243), 3,qt::solidline); qbrush brush(qcolor(255, 255, 255,204));  painter.setpen(pen); painter.setbrush(brush);  qpainterpath rounded_rect; rounded_rect.addroundedrect(qrectf(20, 0, 180, 100), 16, 16); rounded_rect.addroundedrect(qrectf(0, 50 - 20, 40, 40 ), 16, 16);   painter.setclippath(rounded_rect); qregion maskregion = painter.clipregion(); setmask(maskregion);  painter.drawpath(rounded_rect); painter.restore();

it possible. should take @ qt documentation:

edit: should change code following (not tested!)

qpainterpath p1, p2; p1.addroundedrect(qrectf(20, 0, 180, 100), 16, 16); p2.addroundedrect(qrectf(0, 50 - 20, 40, 40 ), 16, 16); p1 += p2; // or -= if want remove part  qregion r(p1.tofillpolygon().topolygon()); setmask(r);

edit 2: solution overwrite paintevent()

instead of creating mask, 1 paint on transparent window overwriting paintevent , painting background of arbitrary complex form. i'm not sure if working qdialog based windows.


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