io.data2viz.shape.curve.Bundle.kt Maven / Gradle / Ivy
package io.data2viz.shape.curve
import io.data2viz.geom.Path
import io.data2viz.shape.Curve
class Bundle(override val path: Path, val beta:Double = 0.85) : Curve {
private val basis = Basis(path)
private var x = arrayListOf()
private var y = arrayListOf()
// TODO : not present in D3
override fun areaStart() {}
// TODO : not present in D3
override fun areaEnd() {}
override fun lineStart() {
x.clear()
y.clear()
basis.lineStart()
}
override fun lineEnd() {
val j = x.size - 1
if (j > 0) {
val x0 = x[0]
val y0 = y[0]
val dx = x[j] - x0
val dy = y[j] - y0
(0..j).forEach { index ->
val t = index / j
basis.point(
(beta * x[index]) + ((1 - beta) * (x0 + t * dx)),
(beta * y[index]) + ((1 - beta) * (y0 + t * dy))
)
}
}
basis.lineEnd()
}
override fun point(x: Double, y: Double) {
this.x.add(x)
this.y.add(y)
}
}