32 lines
No EOL
1 KiB
Text
32 lines
No EOL
1 KiB
Text
import "luxe: math" for Math
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class Util{
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//cirle circle intersections, largely taken from http://paulbourke.net/geometry/circlesphere/
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static circle_intersect_circle(o1, r1, o2, r2){
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var diff_x = o2.x - o1.x
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var diff_y = o2.y - o1.y
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var distance = Math.length(diff_x, diff_y)
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if(distance > r1 + r2) return //too far away
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if(distance < (r1 - r2).abs) return //contain each other
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if(distance <= Num.smallest) return //infinite solutions
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var a = (r1*r1 - r2*r2 + distance*distance) / (2 * distance) //adjacient length of triangle between o1, midpoint and intersection
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var h = (r1*r1 - a*a).sqrt //hypotenuse length of triangle between o1, midpoint and intersection
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var mid_x = o1.x + a * (o2.x - o1.x) / distance
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var mid_y = o1.y + a * (o2.y - o1.y) / distance
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var inter1 = [
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mid_x + h * diff_y / distance,
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mid_y - h * diff_x / distance
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]
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var inter2 = [
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mid_x - h * diff_y / distance,
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mid_y + h * diff_x / distance
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]
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return [inter1, inter2]
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}
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} |