Jetpack compose snippet for drawing a circle with a shadow at a -45° angle

CircleWithShadow.kt

                    var radius by remember { mutableFloatStateOf(0f) }
                    Canvas(modifier = Modifier.matchParentSize()) {
                        // Draw background circle
                        drawCircle(
                            color = Color.White,
                            radius = radius,
                            alpha = .05f,
                            blendMode = BlendMode.Lighten,
                        )

                        // Draw shadow with an angle of -45deg
                        val sin45 = sqrt(2f) / 2f
                        val cos45 = sin45
                        val shadowLength = 15.dp.toPx()
                        drawPath(
                            color = Color.Black,
                            blendMode = BlendMode.Darken,
                            path = run {
                                val outer = Path().apply {
                                    moveTo(center.x + radius * cos45, center.y - radius * sin45)
                                    relativeLineTo(shadowLength, shadowLength)
                                    relativeLineTo(-2 * radius * cos45, 2 * radius * sin45)
                                    relativeLineTo(-shadowLength, -shadowLength)
                                    close()

                                    arcTo(
                                        rect = Rect(center + Offset(shadowLength, shadowLength), radius),
                                        startAngleDegrees = -45f,
                                        sweepAngleDegrees = 180f,
                                        forceMoveTo = false,
                                    )
                                }
                                val mask = Path().apply {
                                    arcTo(
                                        rect = Rect(center, radius),
                                        startAngleDegrees = -45f,
                                        sweepAngleDegrees = 180f,
                                        forceMoveTo = false,
                                    )
                                }

                                Path().apply { op(outer, mask, PathOperation.Difference) }
                            }
                        )
                    }