commonMain.androidx.compose.ui.graphics.Vertices.kt Maven / Gradle / Ivy
/*
* Copyright 2018 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
import androidx.compose.ui.util.fastAny
/** A set of vertex data used by [Canvas.drawVertices]. */
class Vertices(
val vertexMode: VertexMode,
positions: List,
textureCoordinates: List,
colors: List,
indices: List
) /*extends NativeFieldWrapperClass2*/ {
val positions: FloatArray
val textureCoordinates: FloatArray
val colors: IntArray
val indices: ShortArray
init {
val outOfBounds: (Int) -> Boolean = { it < 0 || it >= positions.size }
if (textureCoordinates.size != positions.size)
throw IllegalArgumentException("positions and textureCoordinates lengths must match.")
if (colors.size != positions.size)
throw IllegalArgumentException("positions and colors lengths must match.")
if (indices.fastAny(outOfBounds))
throw IllegalArgumentException(
"indices values must be valid indices " +
"in the positions list."
)
this.positions = encodePointList(positions)
this.textureCoordinates = encodePointList(textureCoordinates)
this.colors = encodeColorList(colors)
this.indices = ShortArray(indices.size) {
i ->
indices[i].toShort()
}
}
private fun encodeColorList(colors: List): IntArray {
return IntArray(colors.size) {
i ->
colors[i].toArgb()
}
}
private fun encodePointList(points: List): FloatArray {
return FloatArray(points.size * 2) { i ->
val pointIndex = i / 2
val point = points[pointIndex]
if (i % 2 == 0) {
point.x
} else {
point.y
}
}
}
}