30 lines
870 B
Kotlin
30 lines
870 B
Kotlin
package org.pupes.mhdrunpathfinder
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import kotlinx.serialization.json.Json
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import kotlin.math.PI
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import kotlin.math.ln
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import kotlin.math.tan
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val json = Json {
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coerceInputValues = true // Coerce nulls to default values if applicable
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ignoreUnknownKeys = true // Ignore fields in JSON not present in the data class
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}
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fun longitudeToXNormalized(longitude: Double): Double {
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return (longitude + 180.0) / 360.0
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}
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fun latitudeToYNormalized(latitude: Double): Double {
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// Clamp latitude to Web Mercator bounds
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val lat = latitude.coerceIn(-85.05112878, 85.05112878)
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// Convert to radians
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val latRad = lat * PI / 180.0
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// Web Mercator projection formula
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val mercatorY = ln(tan(PI / 4.0 + latRad / 2.0))
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// Normalize to 0.0 - 1.0 range
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// The mercator Y range is approximately -PI to PI
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return 0.5 - (mercatorY / (2.0 * PI))
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} |