CODEWITHSUNDEEP
apache-flexactionscript-3actionscript
fortpointuiguy
fortpointuiguy

Reputation: 137

Find point in area of outer circle

I have two circles, an inner circle and an outter circle. I'm trying to find points that reside within the area between the edge of the inner circle and the edge of the outer circle.

Does anyone know a formula for this?

Thanks a lot!

Upvotes: 0

Views: 246

Answers (1)

b7kich
b7kich

Reputation: 4431

Let C_inner and C_outer be the centers of your two circles with radii r_outer > r_inner. Any point P is inside the circle if the distance from the center is smaller than the radius. You're looking for points P that satisfy

( | P - C_outer | < r_outer ) and not ( | P - C_inner | < r_inner )

where the distance is calculated through

| P - C | = (p_x - c_x) ^ 2 + (p_y - c_y) ^ 2

The formula then is

r_inner < (p_x - c_inner_x) ^ 2 + (p_y - c_inner_y) ^ 2 && (p_x - c_outer_x) ^ 2 + (p_y - c_outer_y) ^ 2 < r_outer

Upvotes: 1

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