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distance to point measurer

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Alexey 2025-09-30 14:15:09 +03:00
commit 004b498ee9
1 changed files with 32 additions and 11 deletions
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43
app/src/main/java/com/mirenkov/ktheightmap/MapCanvas.kt
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@ -18,6 +18,7 @@ import androidx.compose.ui.graphics.asImageBitmap
import androidx.compose.ui.graphics.drawscope.Stroke
import androidx.compose.ui.input.pointer.pointerInput
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.text.AnnotatedString
import androidx.compose.ui.text.ParagraphStyle
import androidx.compose.ui.text.SpanStyle
import androidx.compose.ui.text.buildAnnotatedString
@ -25,11 +26,27 @@ import androidx.compose.ui.text.drawText
import androidx.compose.ui.text.rememberTextMeasurer
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.text.withStyle
import kotlin.math.abs
import kotlin.math.absoluteValue
import kotlin.math.floor
import kotlin.math.max
import kotlin.math.min
import kotlin.math.pow
import kotlin.math.sqrt
fun distanceString(targetMeters: Int): AnnotatedString {
return buildAnnotatedString {
withStyle(ParagraphStyle(textAlign = TextAlign.Center)) {
withStyle(SpanStyle(color = Color.White)) {
val text = if (targetMeters >= 100000)
"${targetMeters / 1000}km"
else
"${targetMeters}m"
append(text)
}
}
}
}
@OptIn(ExperimentalUnsignedTypes::class)
@Composable
fun MapCanvas(
@ -189,6 +206,7 @@ fun MapCanvas(
}
}
}
// Placed point and line to center
if (pointLat != 0F) {
val pointOffsetX = SphereMercator.mercateLon(pointLon.toDouble(), level, -TILE_SIZE.toDouble()).toFloat() - offsetX
@ -203,6 +221,8 @@ fun MapCanvas(
start = Offset(pointOffsetX, pointOffsetY),
end = Offset(halvedX, halvedY)
)
val startHeight = KhmParser.getHeight(pointLon, pointLat, ctx)
if (pointOffsetX >= 0 && pointOffsetY >= 0 && pointOffsetX < size.width && pointOffsetY < size.height)
drawText(
@ -241,6 +261,17 @@ fun MapCanvas(
)
}
}
val lineLength = sqrt((pointOffsetX - halvedX).pow(2) + (pointOffsetY - halvedY).pow(2))
val lineMeters = (lineLength * SphereMercator.scaledMetersPerPixel(level + 1)).toInt()
drawText(
textMeasurer = textMeasurer,
text = distanceString(lineMeters),
size = Size(160F, 48F),
topLeft = Offset(
halvedX,
halvedY - 80F
)
)
}
// Cursor path
@ -316,17 +347,7 @@ fun MapCanvas(
// Distance measurer text
drawText(
textMeasurer = textMeasurer,
text = buildAnnotatedString {
withStyle(ParagraphStyle(textAlign = TextAlign.Center)) {
withStyle(SpanStyle(color = Color.White)) {
val text = if (targetMeters >= 100000)
"${targetMeters / 1000}km"
else
"${targetMeters}m"
append(text)
}
}
},
text = distanceString(targetMeters),
topLeft = Offset(targetPixels.toFloat() * 2F, measurerHeight),
size = Size(targetPixels.toFloat() * 2F, 48F)
)