53 lines
1.2 KiB
Go
53 lines
1.2 KiB
Go
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package tins2020
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import "opslag.de/schobers/geom/noise"
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type NoiseMap interface {
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Value(x, y int32) float64
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}
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func NewNoiseMap(seed int64) NoiseMap {
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return &noiseMap{
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noise: noise.NewPerlin(seed),
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alpha: 2,
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beta: 4,
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harmonics: 2,
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}
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}
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func NewRandomNoiseMap(seed int64) NoiseMap {
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return &randomNoiseMap{noise.NewPerlin(seed)}
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}
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type noiseMap struct {
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noise *noise.Perlin
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alpha, beta float64
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harmonics int
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}
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func clipNormalized(x float64) float64 {
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if x < 0 {
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return 0
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}
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if x > 1 {
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return 1
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}
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return x
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}
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// Value generates the noise value for an x/y pair. The range of the output is approximately [-1.325825214,1.325825214] (for 4 harmonics).
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func (m *noiseMap) Value(x, y int32) float64 {
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value := m.noise.Noise2D(float64(x)*.01, float64(y)*.01, m.alpha, m.beta, m.harmonics)*.565 + .5
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return clipNormalized(value)
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}
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type randomNoiseMap struct {
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*noise.Perlin
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}
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// Value generates the noise value for an x/y pair. The range of the output is approximately [-1.325825214,1.325825214] (for 4 harmonics).
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func (m randomNoiseMap) Value(x, y int32) float64 {
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value := m.Noise2D(float64(x)*.53, float64(y)*.53, 1.01, 2, 2)*.5 + .5
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return clipNormalized(value)
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}
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