CheckVLine
enum CheckVLine = 
q{
	static if (CHECKED)
	{
		if (x < 0 || x >= v.w || y1 >= v.h || y2 <= 0 || y1 >= y2) return;
		if (y1 <    0) y1 =   0;
		if (y2 >= v.h) y2 = v.h;
	}
	assert(y1 <= y2);
};
  
		ae utils graphics draw 
		aliasesfunctionsmanifest constantsmixin templatesstructstemplates