mirror of
https://github.com/OpenDiablo2/OpenDiablo2
synced 2025-02-11 19:17:09 -05:00
029cb62972
* Fixed nil pointer in Copy() * Position added Added Floor() and String() methods to Vector. Also added Position which declares an embedded Vector2 and returns various forms of it. * d2vector.Vector2 renamed to d2vector.BigFloat * vector.go renamed to big_float.go * Float64 stub and more renaming * Vector value getters * Separate vector types with initial methods. * Divide and lint warnings. * Distance and Length. * Scale, Abs and Negate. * CompareFloat64Fuzzy delta direction reversed. * Refactor vector_test.go. * Renamed Approx methods. * Distance and Length. * Distance and Length. * Removed BigFloat and Vector, renamed Float64 to Vector, simplified tests. * Angle, SignedAngle and other small functions. * Receiver rename. * SingedAngle and test fixed * Rotate. * SetLength. * Cross. * NinetyAnti and NinetyClock. * Lerp and Clamp. * Reflect and ReflectSurface. * Cardinal convenience functions. * Comments. * Panic on NaN and Inf in Position. * Lint warnings and comments.
68 lines
1.5 KiB
Go
68 lines
1.5 KiB
Go
package d2math
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import "math"
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const (
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// Epsilon is used as the threshold for 'almost equal' operations.
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Epsilon float64 = 0.0001
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// RadToDeg is used to convert anges in radians to degrees by multiplying the radians by RadToDeg. Similarly,degrees
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// are converted to radians when dividing by RadToDeg.
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RadToDeg float64 = 57.29578
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// RadFull is the radian equivalent of 360 degrees.
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RadFull float64 = 6.283185253783088
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)
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// CompareFloat64Fuzzy returns an integer between -1 and 1 describing
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// the comparison of floats a and b. 0 will be returned if the
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// absolute difference between a and b is less than Epsilon.
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func CompareFloat64Fuzzy(a, b float64) int {
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delta := a - b
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if math.Abs(delta) < Epsilon {
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return 0
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}
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if delta > 0 {
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return 1
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}
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return -1
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}
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// ClampFloat64 returns a clamped to min and max.
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func ClampFloat64(a, min, max float64) float64 {
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if a > max {
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return max
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} else if a < min {
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return min
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}
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return a
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}
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// Sign returns the sign of a.
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func Sign(a float64) int {
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switch {
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case a < 0:
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return -1
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case a > 0:
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return +1
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}
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return 0
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}
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// Lerp returns the linear interpolation from a to b using interpolator x.
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func Lerp(a, b, x float64) float64 {
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return a + x*(b-a)
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}
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// Unlerp returns the intepolator Lerp would require to return x when given
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// a and b. The x argument of this function can be thought of as the return
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// value of lerp. The return value of this function can be used as x in
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// Lerp.
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func Unlerp(a, b, x float64) float64 {
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return (x - a) / (b - a)
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}
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