angleTime returns the time [0.0,1.0] of theta between [lower,upper]. When outside of [lower,upper], the result will also be outside of [0.0,1.0].
(theta, lower, upper float64)
| 76 | |
| 77 | // angleTime returns the time [0.0,1.0] of theta between [lower,upper]. When outside of [lower,upper], the result will also be outside of [0.0,1.0]. |
| 78 | func angleTime(theta, lower, upper float64) float64 { |
| 79 | sweep := true |
| 80 | if upper < lower { |
| 81 | // sweep is false, ie direction is along negative angle (clockwise) |
| 82 | lower, upper = upper, lower |
| 83 | sweep = false |
| 84 | } |
| 85 | theta = angleNorm(theta - lower + Epsilon) |
| 86 | upper = angleNorm(upper - lower) |
| 87 | |
| 88 | t := (theta - Epsilon) / upper |
| 89 | if !sweep { |
| 90 | t = 1.0 - t |
| 91 | } |
| 92 | if Equal(t, 0.0) { |
| 93 | return 0.0 |
| 94 | } else if Equal(t, 1.0) { |
| 95 | return 1.0 |
| 96 | } |
| 97 | return t |
| 98 | } |
| 99 | |
| 100 | // angleBetween is true when theta is in range [lower,upper] including the end points. Angles can be outside the [0,2PI) range. |
| 101 | func angleBetween(theta, lower, upper float64) bool { |