TransparentGridRectView.kt

import android.content.Context
import android.graphics.Canvas
import android.graphics.Paint
import android.graphics.Path
import android.util.AttributeSet
import android.view.View


class TransparentGridRectView @JvmOverloads constructor(
    context: Context, attrs: AttributeSet? = null, defStyle: Int = 0
) : View(context, attrs, defStyle) {

    private val blackPaint = Paint().apply {
        color = 0xFF000000.toInt() // Green color
        style = Paint.Style.FILL
    }

    private val grayPaint = Paint().apply {
        color = 0xFF888888.toInt() // Red color
        style = Paint.Style.FILL
    }

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

        var boxSize = 50f // Size of each box

        // Calculate the center of the view
        val centerX = width / 2f
        val centerY = height / 2f

        // Calculate the radius for the circular clipping path
        val radius = Math.min(centerX, centerY)

        // Create a circular path
        val circularPath = Path().apply {
            addCircle(centerX, centerY, radius, Path.Direction.CW)
        }

        // Save the canvas state before clipping
        val saveCount = canvas.save()

        // Clear the canvas with a transparent color
        canvas.drawColor(0, android.graphics.PorterDuff.Mode.CLEAR)

        // Clip the canvas to the circular path
        canvas.clipPath(circularPath)

        // Calculate the number of boxes that can fit in each direction from the center
        val numColumns = (width / boxSize).toInt()
        val numRows = (height / boxSize).toInt()

        // Start drawing from the center
        for (row in -numRows..numRows) {
            for (col in -numColumns..numColumns) {
                val left = centerX + (col * boxSize)
                val top = centerY + (row * boxSize)
                val right = left + boxSize
                val bottom = top + boxSize

                // Alternate between green and red boxes
                val paint = if ((row + col) % 2 == 0) blackPaint else grayPaint
                canvas.drawRect(left, top, right, bottom, paint)
            }
        }
        // Restore the canvas state to remove clipping
        canvas.restoreToCount(saveCount)
    }

//    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
//        super.onMeasure(widthMeasureSpec, widthMeasureSpec)
//    }
}