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Canvas( | |
modifier = Modifier | |
.height(40.dp) | |
.width(300.dp) | |
.clip(RoundedCornerShape(50)) | |
) { | |
... | |
} |
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val bitmap = Bitmap.createBitmap(size.width.toInt(), size.height.toInt(), Bitmap.Config.ARGB_8888) | |
val hueCanvas = Canvas(bitmap) | |
val huePanel = RectF(0f, 0f, bitmap.width.toFloat(), bitmap.height.toFloat()) |
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val hueColors = IntArray((huePanel.width()).toInt()) | |
var hue = 0f | |
for (i in hueColors.indices) { | |
hueColors[i] = AndroidColor.HSVToColor(floatArrayOf(hue, 1f, 1f)) | |
hue += 360f / hueColors.size | |
} |
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val linePaint = Paint() | |
linePaint.strokeWidth = 0F | |
for (i in hueColors.indices) { | |
linePaint.color = hueColors[i] | |
hueCanvas.drawLine(i.toFloat(), 0F, i.toFloat(), huePanel.bottom, linePaint) | |
} |
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drawIntoCanvas { | |
it.nativeCanvas.drawBitmap( | |
bitmap, | |
null, | |
panel.toRect(), | |
null | |
) | |
} |
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val pressOffset = remember { | |
mutableStateOf(Offset.Zero) | |
} | |
Canvas( | |
modifier = Modifier | |
.height(40.dp) | |
.width(300.dp) | |
.clip(RoundedCornerShape(50)) | |
) { | |
..... |
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private fun Modifier.emitDragGesture( | |
interactionSource: MutableInteractionSource | |
): Modifier = composed { | |
val scope = rememberCoroutineScope() | |
pointerInput(Unit) { | |
detectDragGestures { input, _ -> | |
scope.launch { | |
interactionSource.emit(PressInteraction.Press(input.position)) | |
} | |
} |
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scope.launch { | |
interactionSource.interactions.collect { interaction -> | |
when(interaction) { | |
PressInteraction.Press -> { | |
val pressPos = pressPosition.x.coerceIn(0f..drawScopeSize.width) | |
pressOffset.value = Offset(pressPos, 0f) | |
val selectedHue = pointToHue(pressPos) | |
} | |
} | |
} |
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@Composable | |
fun HueBar( | |
setColor: (Float) -> Unit | |
) { | |
val scope = rememberCoroutineScope() | |
val interactionSource = remember { | |
MutableInteractionSource() | |
} | |
val pressOffset = remember { | |
mutableStateOf(Offset.Zero) |
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val interactionSource = remember { | |
MutableInteractionSource() | |
} | |
val scope = rememberCoroutineScope() | |
var sat: Float | |
var value: Float | |
val pressOffset = remember { | |
mutableStateOf(Offset.Zero) | |
} | |
Canvas( |
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