[英]Jetpack Compose - CardView with Arc Shape on border
Cirilo Bido 和 Raghunandan 的回答是一個很好的起點,您可以使用arcTo
將矩形的角倒圓角,但是您不能在裁剪形狀的頂部繪制彎曲的邊緣。 您需要使用cubicTo
繪制圓角邊緣和曲線以裁剪底部形狀
val shape = GenericShape {size: Size, layoutDirection: LayoutDirection ->
// draw cubic on left and right sides for button space
cubicTo()
}
您可以查看此答案以使用立方體繪制。 通過結合兩者,您可以繪制該路徑。
我根據分享的文章創建了這條路徑
Raghunandan 最初,即使這是動畫 BottomBar 的驚人答案,如果您仔細觀察它也不會創建圓形,在底部它會在底部創建三角形而不是圓形,並且 OP 需要形狀並且在文章中也是不同的.
所以我使用滑塊從上面共享的鏈接創建貝塞爾曲線。 它也可以在這里作為教程使用。 如果您願意,它仍然可以調整為更精確的形狀。
我使用 x0, y0 作為參考點來設置控制點並創建了這個路徑擴展 function。
fun Path.roundedRectanglePath(
size: Size,
cornerRadius: Float,
fabRadius: Float,
) {
val centerX = size.width / 2
val x0 = centerX - fabRadius * 1.15f
val y0 = 0f
// offset of the first control point (top part)
val topControlX = x0 + fabRadius * .5f
val topControlY = y0
// offset of the second control point (bottom part)
val bottomControlX = x0
val bottomControlY = y0 + fabRadius
// first curve
// set the starting point of the curve (P2)
val firstCurveStart = Offset(x0, y0)
// set the end point for the first curve (P3)
val firstCurveEnd = Offset(centerX, fabRadius * 1f)
// set the first control point (C1)
val firstCurveControlPoint1 = Offset(
x = topControlX,
y = topControlY
)
// set the second control point (C2)
val firstCurveControlPoint2 = Offset(
x = bottomControlX,
y = bottomControlY
)
// second curve
// end of first curve and start of second curve is the same (P3)
val secondCurveStart = Offset(
x = firstCurveEnd.x,
y = firstCurveEnd.y
)
// end of the second curve (P4)
val secondCurveEnd = Offset(
x = centerX + fabRadius * 1.15f,
y = 0f
)
// set the first control point of second curve (C4)
val secondCurveControlPoint1 = Offset(
x = secondCurveStart.x + fabRadius,
y = bottomControlY
)
// set the second control point (C3)
val secondCurveControlPoint2 = Offset(
x = secondCurveEnd.x - fabRadius / 2,
y = topControlY
)
// Top left arc
val radius = cornerRadius * 2
arcTo(
rect = Rect(
left = 0f,
top = 0f,
right = radius,
bottom = radius
),
startAngleDegrees = 180.0f,
sweepAngleDegrees = 90.0f,
forceMoveTo = false
)
lineTo(x = firstCurveStart.x, y = firstCurveStart.y)
// bezier curve with (P2, C1, C2, P3)
cubicTo(
x1 = firstCurveControlPoint1.x,
y1 = firstCurveControlPoint1.y,
x2 = firstCurveControlPoint2.x,
y2 = firstCurveControlPoint2.y,
x3 = firstCurveEnd.x,
y3 = firstCurveEnd.y
)
// bezier curve with (P3, C4, C3, P4)
cubicTo(
x1 = secondCurveControlPoint1.x,
y1 = secondCurveControlPoint1.y,
x2 = secondCurveControlPoint2.x,
y2 = secondCurveControlPoint2.y,
x3 = secondCurveEnd.x,
y3 = secondCurveEnd.y
)
lineTo(x = size.width - cornerRadius, y = 0f)
// Top right arc
arcTo(
rect = Rect(
left = size.width - radius,
top = 0f,
right = size.width,
bottom = radius
),
startAngleDegrees = -90.0f,
sweepAngleDegrees = 90.0f,
forceMoveTo = false
)
lineTo(x = 0f + size.width, y = size.height - cornerRadius)
// Bottom right arc
arcTo(
rect = Rect(
left = size.width - radius,
top = size.height - radius,
right = size.width,
bottom = size.height
),
startAngleDegrees = 0f,
sweepAngleDegrees = 90.0f,
forceMoveTo = false
)
lineTo(x = cornerRadius, y = size.height)
// Bottom left arc
arcTo(
rect = Rect(
left = 0f,
top = size.height - radius,
right = radius,
bottom = size.height
),
startAngleDegrees = 90.0f,
sweepAngleDegrees = 90.0f,
forceMoveTo = false
)
lineTo(x = 0f, y = cornerRadius)
close()
}
使用此形狀的可組合項
@Composable
private fun CustomArcShape(
modifier: Modifier,
elevation: Dp = 4.dp,
color: Color = MaterialTheme.colorScheme.surface,
contentColor: Color = contentColorFor(color),
content: @Composable () -> Unit
) {
val diameter = 60.dp
val radiusDp = diameter / 2
val cornerRadiusDp = 10.dp
val density = LocalDensity.current
val cutoutRadius = density.run { radiusDp.toPx() }
val cornerRadius = density.run { cornerRadiusDp.toPx() }
val shape = remember {
GenericShape { size: Size, layoutDirection: LayoutDirection ->
this.roundedRectanglePath(
size = size,
cornerRadius = cornerRadius,
fabRadius = cutoutRadius * 2
)
}
}
Spacer(modifier = Modifier.height(diameter / 2))
Box(contentAlignment = Alignment.TopCenter) {
FloatingActionButton(
shape = CircleShape,
containerColor = Color(0xffD32F2F),
modifier = Modifier
.offset(y = -diameter / 5)
.size(diameter)
.drawBehind {
drawCircle(
Color.Red.copy(.5f),
radius = 1.3f * size.width / 2
)
drawCircle(
Color.Red.copy(.3f),
radius = 1.5f * size.width / 2
)
}
.align(Alignment.TopCenter),
onClick = { /*TODO*/ }
) {
Icon(
tint = Color.White,
imageVector = Icons.Filled.Close,
contentDescription = "Close"
)
}
Surface(
modifier = modifier,
shape = shape,
shadowElevation = elevation,
color = color,
contentColor = contentColor
) {
Column {
Spacer(modifier = Modifier.height(diameter))
content()
}
}
}
}
及示范
@Composable
private fun CustomArcShapeSample() {
Column(
modifier = Modifier
.fillMaxSize()
) {
CustomArcShape(
modifier = Modifier
.padding(10.dp)
.fillMaxWidth()
.height(250.dp)
) {
Column(
modifier = Modifier.fillMaxSize(),
horizontalAlignment = Alignment.CenterHorizontally
) {
Text(
"Payment Failed",
color = MaterialTheme.colorScheme.error,
fontWeight = FontWeight.Bold
)
Spacer(modifier = Modifier.height(10.dp))
Text("Sorry !", fontSize = 24.sp, fontWeight = FontWeight.Bold)
Spacer(modifier = Modifier.height(10.dp))
Text("Your transfer to bank failed", color = Color.LightGray)
}
}
Spacer(modifier = Modifier.height(40.dp))
CustomArcShape(
modifier = Modifier
.padding(10.dp)
.fillMaxWidth()
.height(250.dp)
) {
Column(
modifier = Modifier
.fillMaxSize()
.border(1.dp, Color.Green),
horizontalAlignment = Alignment.CenterHorizontally
) {
Text(
"Payment Failed",
color = MaterialTheme.colorScheme.error,
fontWeight = FontWeight.Bold
)
Spacer(modifier = Modifier.height(10.dp))
Text("Sorry !", fontSize = 24.sp, fontWeight = FontWeight.Bold)
Spacer(modifier = Modifier.height(10.dp))
Text("Your transfer to bank failed", color = Color.LightGray)
}
}
}
}
您可能需要在自定義可組合項中繪制該弧線,我發現這篇文章可以幫助您了解在 compose 中繪制的過程!
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