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@handstandsam
Created January 16, 2022 20:24
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Draw a Pokeball on Canvas using Jetpack Compose
import androidx.compose.animation.core.Animatable
import androidx.compose.animation.core.LinearEasing
import androidx.compose.animation.core.tween
import androidx.compose.foundation.Canvas
import androidx.compose.foundation.border
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.remember
import androidx.compose.ui.Modifier
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Brush
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.drawscope.Stroke
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
/**
* Animating: https://stackoverflow.com/questions/67080502/animating-circle-drawing-in-jetpack-compose
* DP to PX: https://stackoverflow.com/questions/65921799/how-to-convert-dp-to-pixels-in-android-jetpack-compose
*/
@Preview
@Composable
fun Pokeball() {
val sizedp = 300.dp
val sizepx = with(LocalDensity.current) { sizedp.toPx() }
Box(
modifier = Modifier
.padding(32.dp)
.wrapContentSize()
) {
val blackLineColor = Color.Black
val strokeWidth = sizepx * .04f
val outterBallPercentage = .25.toFloat()
val innerBallPercentage = .17.toFloat()
val innerestBallPercentage = .10.toFloat()
Box(
modifier = Modifier
.width(sizedp)
.height(sizedp)
) {
Canvas(
modifier = Modifier
.fillMaxSize()
) {
drawArc(
brush = Brush.linearGradient(listOf(Color.White, Color.White)),
startAngle = 0f,
sweepAngle = 180f, // * animateFloat.value,
useCenter = false
)
drawArc(
brush = Brush.linearGradient(listOf(Color.Red, Color.Red)),
startAngle = 180f,
sweepAngle = 180f, // * animateFloat.value,
useCenter = false
)
drawArc(
color = blackLineColor,
startAngle = 0f,
sweepAngle = 360f, // * animateFloat.value,
useCenter = false,
style = Stroke(strokeWidth)
)
drawLine(
color = blackLineColor,
start = Offset(
x = 0f,
y = (size.height / 2)
),
end = Offset(
x = size.width,
y = (size.height / 2)
),
strokeWidth = strokeWidth
)
val outterBallSizePx = sizepx * outterBallPercentage
drawCircle(
color = Color.Black,
radius = outterBallSizePx / 2,
)
val innerBallSizePx = sizepx * innerBallPercentage
drawCircle(
color = Color.White,
radius = innerBallSizePx / 2,
)
val innerestBallSizePx = sizepx * innerestBallPercentage
val innerestBallMarginPx = ((sizepx - innerestBallSizePx) / 2)
drawArc(
color = Color.LightGray,
startAngle = 0f,
sweepAngle = 360f, // * animateFloat.value,
useCenter = false,
topLeft = Offset(
x = innerestBallMarginPx,
y = innerestBallMarginPx,
),
size = Size(
width = innerestBallSizePx,
height = innerestBallSizePx,
),
style = Stroke(4f)
)
}
}
}
}
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