Created
January 16, 2022 20:24
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Draw a Pokeball on Canvas using Jetpack Compose
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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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