Created
March 20, 2020 17:16
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Custom edge treatment to create a circle edge in a shape
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import com.google.android.material.shape.EdgeTreatment | |
import com.google.android.material.shape.ShapePath | |
import kotlin.math.atan | |
import kotlin.math.sqrt | |
class CircleEdgeTreatment | |
( | |
private val radius: Float, | |
private val cradleRoundedCornerRadius: Float | |
) : | |
EdgeTreatment() { | |
override fun getEdgePath( | |
length: Float, | |
center: Float, | |
interpolation: Float, | |
shapePath: ShapePath | |
) { | |
val roundedCornerOffset = interpolation * this.cradleRoundedCornerRadius | |
val middle = length / 2.0f | |
val verticalOffset = (1.0f - interpolation) * radius | |
val verticalOffsetRatio = verticalOffset / radius | |
if (verticalOffsetRatio >= 1.0f) { | |
shapePath.lineTo(length, 0.0f) | |
} else { | |
val distanceBetweenCenters = radius + roundedCornerOffset | |
val distanceBetweenCentersSquared = distanceBetweenCenters * distanceBetweenCenters | |
val distanceY = verticalOffset + roundedCornerOffset | |
val distanceX = | |
sqrt((distanceBetweenCentersSquared - distanceY * distanceY).toDouble()).toFloat() | |
val leftRoundedCornerCircleX = middle - distanceX | |
val rightRoundedCornerCircleX = middle + distanceX | |
val cornerRadiusArcLength = | |
Math.toDegrees(atan((distanceX / distanceY).toDouble())).toFloat() | |
val cutoutArcOffset = 90.0f - cornerRadiusArcLength | |
shapePath.lineTo(leftRoundedCornerCircleX - roundedCornerOffset, 0.0f) | |
shapePath.addArc( | |
leftRoundedCornerCircleX - roundedCornerOffset, | |
0.0f, | |
leftRoundedCornerCircleX + roundedCornerOffset, | |
roundedCornerOffset * 2.0f, | |
270.0f, | |
cornerRadiusArcLength | |
) | |
shapePath.addArc( | |
middle - radius, | |
-radius - verticalOffset, | |
middle + radius, | |
radius - verticalOffset, | |
180.0f - cutoutArcOffset, | |
cutoutArcOffset * 2.0f - 180.0f | |
) | |
shapePath.addArc( | |
rightRoundedCornerCircleX - roundedCornerOffset, | |
0.0f, | |
rightRoundedCornerCircleX + roundedCornerOffset, | |
roundedCornerOffset * 2.0f, | |
270.0f - cornerRadiusArcLength, | |
cornerRadiusArcLength | |
) | |
shapePath.lineTo(length, 0.0f) | |
} | |
} | |
} |
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