[英]Jetpack compose how to draw curved lines
我不確定你是否想要更動態的東西,但這個片段可以讓你對此有所了解。
@vishal-vasani 評論的文章非常有幫助。
@Composable
fun DrawBrackets() {
Canvas(
modifier = Modifier
.height(200.dp)
.fillMaxWidth()
) {
val width = size.width
val height = size.height
val halfWidth = width.times(.5f)
val halfHeight = height.times(.5f)
val startPoints = listOf(
PointF(0f, 0f),
PointF(0f, halfHeight),
PointF(0f, height),
PointF(width, 0f),
PointF(width, halfHeight),
PointF(width, height),
)
val path = Path().apply {
startPoints.forEach { point ->
val lineEndX =
if (point.x > halfWidth)
width.minus(halfWidth.times(.3f))
else
halfWidth.times(.3f)
val curveXPart1 =
if (point.x > halfWidth)
width.minus(halfWidth.times(.5f))
else
halfWidth.times(.5f)
val curveXPart2 =
if (point.x > halfWidth)
width.minus(halfWidth.times(.7f))
else
halfWidth.times(.7f)
val curve1 = PointF(curveXPart1, point.y)
val curve2 = PointF(curveXPart1, halfHeight - ((halfHeight - point.y) / 2))
moveTo(point.x, point.y)
lineTo(lineEndX, point.y)
quadraticBezierTo(
curve1.x,
curve1.y,
curve2.x,
curve2.y,
)
quadraticBezierTo(
curveXPart1,
halfHeight,
curveXPart2,
halfHeight,
)
lineTo(halfWidth, halfHeight)
}
}
drawPath(
path = path,
color = Color.Black,
style = Stroke(width = 20f, cap = StrokeCap.Round)
)
}
}
結果如下:
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