try to draw segment

SegmentCircleView.kt

import android.content.Context
import android.graphics.*
import android.util.AttributeSet
import android.view.View

class SegmentCircleView @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = 0
) : View(context, attrs, defStyleAttr) {
    private val paintSource = Paint().apply {
        isAntiAlias = true
        color = Color.RED
        style = Paint.Style.FILL
    }

    private val paintDestination = Paint().apply {
        isAntiAlias = true
        color = Color.YELLOW
        style = Paint.Style.FILL

        xfermode = PorterDuffXfermode(PorterDuff.Mode.ADD)
    }

    override fun onDraw(canvas: Canvas?) {
        super.onDraw(canvas)

        val cx = 200f
        val cy = 200f
        val radius = 100f
        canvas?.drawCircle(
            cx,
            cy,
            radius,
            paintSource
        )

        val left = 100f
        val top = 240f
        val right = 300f
        val bottom = 300f
        val rectF = RectF(
            left,
            top,
            right,
            bottom,
        )
        canvas?.drawRect(rectF, paintDestination)
    }
}