AndroidPathMeasure.android.kt
/*
* Copyright 2020 The Android Open Source Project
*
* 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 androidx.compose.ui.graphics
import androidx.compose.ui.geometry.Offset
actual fun PathMeasure(): PathMeasure = AndroidPathMeasure(android.graphics.PathMeasure())
class AndroidPathMeasure internal constructor(
private val internalPathMeasure: android.graphics.PathMeasure
) : PathMeasure {
override val length: Float
get() = internalPathMeasure.length
private var positionArray: FloatArray? = null
private var tangentArray: FloatArray? = null
override fun getSegment(
startDistance: Float,
stopDistance: Float,
destination: Path,
startWithMoveTo: Boolean
): Boolean {
return internalPathMeasure.getSegment(
startDistance,
stopDistance,
destination.asAndroidPath(),
startWithMoveTo
)
}
override fun setPath(path: Path?, forceClosed: Boolean) {
internalPathMeasure.setPath(path?.asAndroidPath(), forceClosed)
}
override fun getPosition(
distance: Float
): Offset {
if (positionArray == null) {
positionArray = FloatArray(2)
}
if (tangentArray == null) {
tangentArray = FloatArray(2)
}
val result = internalPathMeasure.getPosTan(distance, positionArray, tangentArray)
return if (result) {
Offset(positionArray!![0], positionArray!![1])
} else {
Offset.Unspecified
}
}
override fun getTangent(
distance: Float
): Offset {
if (positionArray == null) {
positionArray = FloatArray(2)
}
if (tangentArray == null) {
tangentArray = FloatArray(2)
}
val result = internalPathMeasure.getPosTan(distance, positionArray, tangentArray)
return if (result) {
Offset(tangentArray!![0], tangentArray!![1])
} else {
Offset.Unspecified
}
}
}