不太清楚你为什么在谈论Canvas
。要裁剪这样的视图,您可以使用自定义Shape
并将其应用到您的视图中Modifier.clip https://developer.android.com/reference/kotlin/androidx/compose/ui/draw/package-summary#(androidx.compose.ui.Modifier).clip(androidx.compose.ui.graphics.Shape)。这是您可以使用的形状:
class WavyShape(
private val period: Dp,
private val amplitude: Dp,
) : Shape {
override fun createOutline(
size: Size,
layoutDirection: LayoutDirection,
density: Density,
) = Outline.Generic(Path().apply {
val wavyPath = Path().apply {
val halfPeriod = with(density) { period.toPx() } / 2
val amplitude = with(density) { amplitude.toPx() }
moveTo(x = -halfPeriod / 2, y = amplitude)
repeat(ceil(size.width / halfPeriod + 1).toInt()) { i ->
relativeQuadraticBezierTo(
dx1 = halfPeriod / 2,
dy1 = 2 * amplitude * (if (i % 2 == 0) 1 else -1),
dx2 = halfPeriod,
dy2 = 0f,
)
}
lineTo(size.width, size.height)
lineTo(0f, size.height)
}
val boundsPath = Path().apply {
addRect(Rect(offset = Offset.Zero, size = size))
}
op(wavyPath, boundsPath, PathOperation.Intersect)
})
}
如果你真的需要在里面使用这个Canvas
由于某种原因,你可以通过相同的Path
我在里面创造的WavyShape
to DrawScope.clipPath https://developer.android.com/reference/kotlin/androidx/compose/ui/graphics/drawscope/package-summary#(androidx.compose.ui.graphics.drawscope.DrawScope).clipPath(androidx.compose.ui.graphics.Path,androidx.compose.ui.graphics.ClipOp,kotlin.Function1),使得内容clipPath
块将被剪切。
将自定义形状应用到您的Image
或任何其他视图:
Image(
painter = painterResource(id = R.drawable.my_image_1),
contentDescription = null,
contentScale = ContentScale.FillBounds,
modifier = Modifier
.clip(WavyShape(period = 100.dp, amplitude = 50.dp))
)
Result: