commonMain.io.data2viz.geo.projection.Equirectangular.kt Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of d2v-geo Show documentation

Data2viz d2v-geo library

There is a newer version: 10.0.4

/*
 * Copyright (c) 2018-2021. data2viz sàrl.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */

package io.data2viz.geo.projection

import io.data2viz.geo.projection.common.Projection
import io.data2viz.geo.projection.common.Projector
import io.data2viz.geo.projection.common.projection

public fun equirectangularProjection(init: Projection.() -> Unit = {}): Projection =
    projection(EquirectangularProjector()) {
        scale = 152.63
        init()
    }

/**
 * Cylindrical projections projector the sphere onto a containing cylinder,
 * and then unroll the cylinder onto the plane.
 * Pseudocylindrical projections are a generalization of cylindrical projections.
 * The equirectangular (plate carrée) projection.
 */
internal class EquirectangularProjector : Projector {
    override fun project(lambda: Double, phi: Double) = doubleArrayOf(lambda, phi)
    override fun invert(x: Double, y: Double) = doubleArrayOf(x, y)
}