2ndbeam/ktheightmap
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Added canvas

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This commit is contained in:
Alexey 2025-07-25 15:59:12 +03:00
commit 9007a96853
1 changed files with 75 additions and 10 deletions
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app/src/main/java/com/mirenkov/ktheightmap/MainActivity.kt
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@ -5,22 +5,32 @@ import android.util.Log
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.compose.foundation.Canvas
import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.safeDrawingPadding
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Add
import androidx.compose.material.icons.filled.Build
import androidx.compose.material3.ExtendedFloatingActionButton
import androidx.compose.material3.FloatingActionButton
import androidx.compose.material3.Icon
import androidx.compose.material3.MaterialTheme.colorScheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.mutableFloatStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.ui.Modifier
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.drawscope.Stroke
import androidx.compose.ui.tooling.preview.Preview
import com.mirenkov.ktheightmap.ui.theme.KtHeightMapTheme
const val TAG = "KtHeightMap"
const val TILE_SIZE: Float = 128F
class MainActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
@ -28,20 +38,67 @@ class MainActivity : ComponentActivity() {
enableEdgeToEdge()
setContent {
KtHeightMapTheme {
Scaffold(
modifier = Modifier.fillMaxSize(),
floatingActionButton = { ToolButton() }
) { innerPadding ->
Greeting(
name = "gryadki",
modifier = Modifier.padding(innerPadding)
)
Surface {
Scaffold(
modifier = Modifier.fillMaxSize()
.safeDrawingPadding(),
floatingActionButton = { ToolButton() }
) { innerPadding ->
MapCanvas(
gridColor = colorScheme.primary,
backColor = colorScheme.background,
modifier = Modifier.padding(innerPadding),
)
}
}
}
}
}
}
@Composable
fun MapCanvas(
backColor: Color,
gridColor: Color,
modifier: Modifier = Modifier
) {
val offsetX = rememberSaveable { mutableFloatStateOf(0F) }
val offsetY = rememberSaveable { mutableFloatStateOf(0F) }
Canvas(
modifier = modifier.fillMaxSize()
.clickable {
offsetX.floatValue += 20
offsetY.floatValue += 20
}
) {
drawRect(
color = backColor,
size = size
)
val strippedOffsetX = offsetX.floatValue % TILE_SIZE
val strippedOffsetY = offsetY.floatValue % TILE_SIZE
val offset = Offset(strippedOffsetX, strippedOffsetY)
val grid = size / TILE_SIZE
val gridWidth = grid.width.toInt()
val gridHeight = grid.height.toInt()
for (cellX in 0 .. gridWidth + 1) {
val offsetX = TILE_SIZE * (cellX - 1)
for (cellY in 0 .. gridHeight + 1) {
val offsetY = TILE_SIZE * (cellY - 1)
drawRect(
color = gridColor,
size = Size(TILE_SIZE, TILE_SIZE),
topLeft = offset + Offset(offsetX, offsetY),
style = Stroke(width = 4F)
)
}
}
}
}
@Composable
fun Greeting(name: String, modifier: Modifier = Modifier) {
Text(
@ -65,4 +122,12 @@ fun GreetingPreview() {
KtHeightMapTheme {
Greeting("Android")
}
}
@Preview(showBackground = true)
@Composable
fun ToolButtonPreview() {
KtHeightMapTheme {
ToolButton()
}
}