在Compose中使用可绘制的动画矢量,可以通过以下步骤实现:
import androidx.compose.animation.core.*
import androidx.compose.foundation.Canvas
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.drawscope.Stroke
import androidx.compose.ui.graphics.vector.Path
import androidx.compose.ui.graphics.vector.PathBuilder
import androidx.compose.ui.graphics.vector.rememberVectorPainter
@Composable
fun AnimatedVectorExample() {
var progress by remember { mutableStateOf(0f) }
val duration = 2000
val infiniteTransition = rememberInfiniteTransition()
val animatedProgress by infiniteTransition.animateFloat(
initialValue = 0f,
targetValue = 1f,
animationSpec = infiniteRepeatable(
animation = tween(durationMillis = duration, easing = LinearEasing),
repeatMode = RepeatMode.Restart
)
)
progress = animatedProgress
}
@Composable
fun AnimatedVectorDrawable() {
val pathData = "M100,100 L200,200 L300,100 L400,200"
val path = remember {
PathBuilder(Path.FillType.NonZero).apply {
addPathData(pathData)
}.build()
}
val vectorPainter = rememberVectorPainter(
defaultWidth = 500.dp,
defaultHeight = 500.dp,
viewportWidth = 500f,
viewportHeight = 500f
) { canvas, _ ->
canvas.drawPath(
path = path,
color = Color.Blue,
style = Stroke(width = 5f)
)
}
Canvas(
modifier = Modifier.fillMaxSize(),
onDraw = { canvas ->
vectorPainter.paint(canvas, size)
}
)
}
@Composable
fun ComposeAnimationExample() {
Box(modifier = Modifier.fillMaxSize()) {
AnimatedVectorExample()
AnimatedVectorDrawable()
}
}
这样,你就可以在Compose中使用可绘制的动画矢量了。在上述示例中,我们使用了Canvas
来绘制动画矢量,并通过rememberVectorPainter
创建了一个可绘制的矢量图形。动画效果通过rememberInfiniteTransition
和animateFloat
来实现,可以根据需要调整动画的参数和效果。
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