io.data2viz.shape.Math.kt Maven / Gradle / Ivy
/*
* Copyright (c) 2018-2019. 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.shape
//import io.data2viz.math.Angle
import kotlin.math.PI
val epsilon = 1e-12
val pi = PI
val halfPi = pi / 2
val tau = 2 * pi
fun acos(x: Double) = if (x > 1.0) 0.0 else if (x < -1) pi else kotlin.math.acos(x)
fun asin(x: Double) = if (x >= 1.0) halfPi else if (x <= -1.0) -halfPi else kotlin.math.asin(x)
//fun acos(a: Angle) = if (a.rad > 1.0) 0.0 else if (a.rad < -1) pi else a.acos
//fun asin(a: Angle) = if (a.rad >= 1.0) halfPi else if (a.rad <= -1.0) -halfPi else a.asin