io.data2viz.shape.curve.BasisClosed.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.curve
import io.data2viz.geom.Path
import io.data2viz.shape.Curve
class BasisClosed(override val path: Path): Curve {
private var x0 = -1.0
private var y0 = -1.0
private var x1 = -1.0
private var y1 = -1.0
private var x2 = -1.0
private var y2 = -1.0
private var x3 = -1.0
private var y3 = -1.0
private var x4 = -1.0
private var y4 = -1.0
private var pointStatus = -1
override fun areaStart() {}
override fun areaEnd() {}
override fun lineStart() {
x0 = -1.0
y0 = -1.0
x1 = -1.0
y1 = -1.0
x2 = -1.0
y2 = -1.0
x3 = -1.0
y3 = -1.0
x4 = -1.0
y4 = -1.0
pointStatus = 0
}
override fun lineEnd() {
when (pointStatus) {
1 -> {
path.moveTo(x2, y2)
path.closePath()
}
2 -> {
path.moveTo((x2 + 2 * x3) / 3, (y2 + 2 * y3) / 3)
path.lineTo((x3 + 2 * x2) / 3, (y3 + 2 * y2) / 3)
path.closePath()
}
3 -> {
point(x2, y2)
point(x3, y3)
point(x4, y4)
}
}
}
// TODO : non specific, inherit from basis
private fun curve(x: Double, y: Double){
path.bezierCurveTo(
(2 * x0 + x1) / 3,
(2 * y0 + y1) / 3,
(x0 + 2 * x1) / 3,
(y0 + 2 * y1) / 3,
(x0 + 4 * x1 + x) / 6,
(y0 + 4 * y1 + y) / 6
)
}
override fun point(x: Double, y: Double) {
when (pointStatus) {
0 -> {
pointStatus = 1
x2 = x
y2 = y
}
1 -> {
pointStatus = 2
x3 = x
y3 = y
}
2 -> {
pointStatus = 3
x4 = x
y4 = y
path.moveTo((x0 + 4 * x1 + x) / 6, (y0 + 4 * y1 + y) / 6)
}
else -> {
curve(x, y)
}
}
x0 = x1
x1 = x
y0 = y1
y1 = y
}
}