[英]Draw arc with inner text in middle of arc
在 compose 中繪制弧線:
val sizeInPx = with(LocalDensity.current) { 100.dp.toPx() }
Canvas(modifier = Modifier.fillMaxSize()) {
drawArc(
Color.Green,
200f,
40f,
topLeft = Offset(0f, 0f),
useCenter = true,
size = Size(sizeInPx, sizeInPx)
)
}
我想在中間的那條弧線內繪制文字。
例子:
試:
val middleAngle = 220f
val path = Path()
path.addArc(RectF(0f, 0f, 100f, 100f), middleAngle, middleAngle)
it.nativeCanvas.drawTextOnPath(sector.text, path, 0f, 0f, paint)
但是,這不是在正確的位置繪制文本,也不是所需的方向。
這項工作。
@Composable
fun Test(modifier: Modifier) {
val paint = Paint().asFrameworkPaint()
val sizeInPx = with(LocalDensity.current) { 300.dp.toPx() }
val x = 100f
val y = 400f
Canvas(modifier = modifier) {
drawArc(
Color.Green,
200f,
40f,
topLeft = Offset(x, y),
useCenter = true,
size = Size(sizeInPx, sizeInPx)
)
paint.apply {
textAlign = android.graphics.Paint.Align.CENTER
isAntiAlias = true
textSize = 24f
typeface = Typeface.create(Typeface.DEFAULT, Typeface.BOLD)
}
drawIntoCanvas {
val path = Path()
path.addArc(RectF(x, y, x + sizeInPx, y + sizeInPx), 240f, -40f)
it.nativeCanvas.drawTextOnPath("Hello world", path, 0f, 0f, paint)
}
}
}
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