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• 0.7.1-RC6
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• OrthographicProjection.kt

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io.data2viz.geo.projection.OrthographicProjection.kt Maven / Gradle / Ivy

package io.data2viz.geo.projection

import io.data2viz.math.EPSILON
import kotlin.math.asin
import kotlin.math.cos
import kotlin.math.sin

fun orthographic(init: MutableProjection.() -> Unit) = projection(OrthographicProjector()) {
    scale = 249.5
    clipAngle = 90 + EPSILON
    init()
}

class OrthographicProjector : ProjectableInvertable {
    private val invertFunction = azimuthalInvert(::asin)

    override fun project(lambda: Double, phi: Double) = doubleArrayOf(cos(phi) * sin(lambda), sin(phi))
    override fun invert(x: Double, y: Double) = invertFunction(x, y)
}