intersect
Calculates the intersection of two rectangles.
It is allowed for @dest to be the same as either @src1 or @src2. If the rectangles do not intersect, @dest’s width and height is set to 0 and its x and y values are undefined. If you are only interested in whether the rectangles intersect, but not in the intersecting area itself, pass null for @dest.
Return
true if the rectangles intersect.
Parameters
src2
a GdkRectangle
dest
return location for the intersection of @src1 and @src2