io.data2viz.shape.curve.Step.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
// TODO : StepBefore, StepAfter, Step
abstract class AbstractStep(override val path: Path, changePoint: Double = 0.5) : Curve {
private var x = -1.0
private var y = -1.0
private var lineStatus = -1
private var pointStatus = -1
private var _changePoint = changePoint
override fun areaStart() {
lineStatus = 0
}
override fun areaEnd() {
lineStatus = -1
}
override fun lineStart() {
x = -1.0
y = -1.0
pointStatus = 0
}
override fun lineEnd() {
if (0 < _changePoint && _changePoint < 1 && pointStatus == 2) path.lineTo(x, y)
if (lineStatus > 0) path.closePath()
if (lineStatus >= 0) {
_changePoint = 1 - _changePoint
lineStatus = 1 - lineStatus
}
}
override fun point(x: Double, y: Double) {
when (pointStatus) {
0 -> {
pointStatus = 1
if (lineStatus > 0) path.lineTo(x, y) else path.moveTo(x, y)
this.x = x
this.y = y
return
}
1 -> pointStatus = 2
else -> {
}
}
if (_changePoint <= 0) {
path.lineTo(this.x, y)
path.lineTo(x, y)
} else {
val x1 = this.x * (1 - _changePoint) + x * _changePoint
path.lineTo(x1, this.y)
path.lineTo(x1, y)
}
this.x = x
this.y = y
}
}
class Step(override val path: Path) : AbstractStep(path, 0.5)
class StepBefore(override val path: Path) : AbstractStep(path, 0.0)
class StepAfter(override val path: Path) : AbstractStep(path, 1.0)