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opengl drwaing house
4.5
Drawing programs often allow one to enter polylines using a mouse and then to edit the polylines
until they present the desired picture. In the following figure (Figure 2.53), (a) shows a house in
the process of being drawn; the user has just clicked at the position shown, and a line has been
drawn from the previous point to the designated by the mouse.
(b) shows the effect of moving a point. The user positions the cursor near the vertex of some
polyline, presses down the mouse button, and "drags" the chosen point to some other location
before releasing the button. Upon release of the button, the previous lines connected to this point
are erased, and new lines are drawn to it.
(c) shows how a point is deleted from a ployline. The user clicks near the vertex of some polyline,
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