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Each pixel lies at a place that can be referred to by an instance of the
Point class. Such Point instances contain the
coordinates of the point, expressed in terms of two nonnegative integer
instance variables, x and y.
You can create a new point, with coordinates 5 and 3, by
sending the x:y: class method to the Point class:
Point x: 5 y: 3 <-- The point with x=5 and y=3
Note that x and y are measured with respect to the left side
and top of a window, rather than to the left side and bottom. The x
coordinate of the point shown in the following, for example, is 5, and the
y coordinate is 3:
