// GridOfLines Example
// Source code file: MainActivity.kt

package it372.ssmith.gridoflines
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.padding
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.foundation.Canvas
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.size
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContent {
            MainLayout()
        }
    }
}

@Composable
fun MainLayout( ) {
    Column(
        modifier = Modifier.padding(20.dp)
            .fillMaxSize( ))
    {

        Canvas(
            modifier = Modifier
                .padding(20.dp)
                .size(300.dp, 300.dp)
                .background(Color(0xFFC0C0C0))
                .fillMaxSize( ))
        {
            // Draw horizontal lines.
            for(x in 0..700 step 50) {
            drawLine(color = Color.Red,
                start = Offset(x.toFloat( ), 0f),
                end = Offset(x.toFloat( ), 700f),
                strokeWidth = 5f)
            }

            // Draw vertical lines.
            for(y in 0..700 step 50) {
                drawLine(color = Color.Red,
                    start = Offset(0f, y.toFloat( )),
                    end = Offset(x = 700f, y.toFloat( )),
                    strokeWidth = 5f)
            }
        }
    }
}

@Preview(showBackground = true)
@Composable
fun GreetingPreview() {
    MainLayout( )
}