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change point drawing based on strokeCap

--- a/api.c

+++ b/api.c

@@ -162,7 +162,10 @@

 	p1 = addpt(origin, Pt(x, y));

 	p2 = addpt(p1, Pt(strokewidth, strokewidth));

 	if(!nostroke)

-		draw(canvas, Rpt(p1, p2), stroke, nil, ZP);

+		if(strokecap == Endsquare)

+			draw(canvas, Rpt(p1, p2), stroke, nil, ZP);

+		else if(strokecap == Enddisc)

+			fillellipse(canvas, p1, strokewidth/2.0, strokewidth/2.0, stroke, ZP);

 	return 0;

 }