Python Graphics by B.J. Korites

Author:B.J. Korites
Language: eng
Format: epub
Publisher: Apress, Berkeley, CA

5.3 Line Intersecting a Circle

The determination of whether the hit point of a line intersecting the plane of a circle is within the circle is trivial. As shown in Figure 5-13, if the distance from the circle’s center to the hit point is greater than the circle’s radius, it lies outside the circle:

if rh > r NO HIT

Figure 5-13Model for out-of-bounds test for a circle

We won’t bother writing a separate program to demonstrate this. You should be able to do that yourself by modifying Listing 5-1 or Listing 5-3. Simply fill the x[ ],y[ ], and z[ ] lists with the points defining the circle’s perimeter and the line coordinates and modify the functions plotsystem and hitpoint.

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