Created
October 14, 2015 04:31
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Circle & sphere interactions
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| // Point is inside circle. | |
| function isWithinCircle(x, y, circleX, circleY, circleRadius){ | |
| return square(circleX - x) + square(circleY - y) < square(circleRadius); | |
| } | |
| // Two circles interecting | |
| function doCirclesIntersect(x1, y1, r1, x2, y2, r2){ | |
| return Math.sqrt(square(x1-x2) + square(y1 - y2)) <= r1 + r2; | |
| } | |
| // Point is inside sphere | |
| function isWithinSphere(x, y, z, circleX, circleY, circleZ, circleRadius){ | |
| return square(circleX - x) + square(circleY - y) + (circleZ - z) < square(circleRadius) | |
| } | |
| // Spheres intersect | |
| function doSpheresIntersect(x1, y1, z1, r1, x2, y2, z2, r2){ | |
| return Math.sqrt(square(x1 - x2) + square(y1 - y2) + square(z1 - z2)) <= r1 + r2 | |
| } | |
| // Utility | |
| function square(x){ | |
| // Math.pow(x, 2) also works | |
| return x * x; | |
| } |
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