ml
40 lines
1.4 KiB
Go
40 lines
1.4 KiB
Go
package level
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import (
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"math"
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)
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var tileHeights = []float64{32.0, 16.0, 8.0, 4.0, 2.0, 1.0, 0.5, 0.25}
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// HeightShift indicates the vertical scale of a level.
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type HeightShift int32
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// ValueFromTileHeight returns a floating point value in tiles based on a tile height.
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func (shift HeightShift) ValueFromTileHeight(raw TileHeightUnit) (float32, error) {
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return shift.valueFromScale(float32(raw), float64(TileHeightUnitMax))
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}
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// ValueFromObjectHeight returns a floating point value in tiles based on an object height.
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func (shift HeightShift) ValueFromObjectHeight(raw HeightUnit) (float32, error) {
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return shift.valueFromScale(float32(raw), float64(0x100))
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}
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// ValueToObjectHeight returns an object height value based on given floating point value.
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func (shift HeightShift) ValueToObjectHeight(value float32) HeightUnit {
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return HeightUnit(math.Min(0xFF, math.Max(0, shift.valueToScale(value, float64(0x100)))))
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}
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func (shift HeightShift) valueFromScale(raw float32, scale float64) (float32, error) {
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if (shift < 0) || (int(shift) >= len(tileHeights)) {
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return 0.0, errInvalidHeightShift
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}
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return float32((float64(raw) * tileHeights[int(shift)]) / scale), nil
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}
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func (shift HeightShift) valueToScale(value float32, scale float64) float64 {
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if (shift < 0) || (int(shift) >= len(tileHeights)) {
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return 0.0
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}
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return (float64(value) * scale) / tileHeights[shift]
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}
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