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Draw region around center point. (Need to investigate formulas that take the shape of the earth + lat/long not being perfect square into account)

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This commit is contained in:
PWRxPSYCHO
2022-02-23 13:54:48 -05:00
parent cdbd762e27
commit 48b6bd1ebf
1 changed files with 55 additions and 7 deletions
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62
app/src/main/java/com/geeksville/mesh/ui/MapFragment.kt
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@@ -13,7 +13,6 @@ import android.widget.Toast
import androidx.core.content.ContextCompat
import androidx.core.graphics.drawable.toBitmap
import androidx.core.view.isVisible
import androidx.fragment.app.DialogFragment
import androidx.fragment.app.activityViewModels
import androidx.lifecycle.Observer
import com.geeksville.android.GeeksvilleApplication
@@ -32,11 +31,11 @@ import com.mapbox.maps.dsl.cameraOptions
import com.mapbox.maps.extension.style.expressions.generated.Expression
import com.mapbox.maps.extension.style.layers.addLayer
import com.mapbox.maps.extension.style.layers.generated.SymbolLayer
import com.mapbox.maps.extension.style.layers.properties.generated.IconAnchor
import com.mapbox.maps.extension.style.layers.properties.generated.TextAnchor
import com.mapbox.maps.extension.style.layers.properties.generated.TextJustify
import com.mapbox.maps.extension.style.layers.generated.lineLayer
import com.mapbox.maps.extension.style.layers.properties.generated.*
import com.mapbox.maps.extension.style.sources.addSource
import com.mapbox.maps.extension.style.sources.generated.GeoJsonSource
import com.mapbox.maps.extension.style.sources.generated.geoJsonSource
import com.mapbox.maps.plugin.animation.MapAnimationOptions
import com.mapbox.maps.plugin.animation.flyTo
import com.mapbox.maps.plugin.annotation.generated.CircleAnnotationOptions
@@ -479,12 +478,59 @@ class MapFragment : ScreenFragment("Map"), Logging {
pointLat = String.format("%.2f", it.latitude())
point = Point.fromLngLat(it.longitude(), it.latitude())
/*
Calculate region from user specified position.
2.5 miles N,S,E,W from user center point.
*/
val topFromCenter = calculateCoordinate(90.0, point.latitude(), point.longitude())
val bottomFromCenter = calculateCoordinate(270.0, point.latitude(), point.longitude())
val topLeft =
calculateCoordinate(180.0, topFromCenter.latitude(), topFromCenter.longitude())
val topRight = calculateCoordinate(0.0, topFromCenter.latitude(), topFromCenter.longitude())
val bottomLeft =
calculateCoordinate(180.0, bottomFromCenter.latitude(), bottomFromCenter.longitude())
val bottomRight =
calculateCoordinate(0.0, bottomFromCenter.latitude(), bottomFromCenter.longitude())
val pointList = listOf(
topRight,
topLeft,
bottomLeft,
bottomRight,
topRight
)
// val ploygonCoordList = listOf(pointList)
// Polygon.fromLngLats(ploygonCoordList)
val squareRegion = LineString.fromLngLats(pointList)
val geoJsonSource = geoJsonSource("BOUNDING_BOX_ID") {
geometry(squareRegion)
}
val lineLayer = lineLayer("lineLayer", "BOUNDING_BOX_ID") {
lineCap(LineCap.ROUND)
lineJoin(LineJoin.MITER)
lineOpacity(0.7)
lineWidth(1.5)
lineColor("#888")
}
mapView?.getMapboxMap()?.getStyle()?.let { style ->
userTouchPosition.geometry(point)
geoJsonSource.geometry(squareRegion)
if (!style.styleLayerExists(userTouchLayerId)) {
style.addImage(userPointImageId, userDefinedPointImg)
style.addSource(userTouchPosition)
style.addSource(geoJsonSource)
style.addLayer(lineLayer)
style.addLayer(userTouchLayer)
} else {
style.removeStyleLayer("lineLayer")
style.removeStyleSource("BOUNDING_BOX_ID")
style.addSource(geoJsonSource)
style.addLayer(lineLayer)
}
}
return@OnMapLongClickListener true
@@ -492,10 +538,12 @@ class MapFragment : ScreenFragment("Map"), Logging {
private fun calculateCoordinate(degrees: Double, lat: Double, long: Double): Point {
val deg = Math.toRadians(degrees)
val distancesInMeters = 4023.36 // 2.5 miles
val distancesInMeters = 8046.72 // 5 miles
val newLong = long + (180 / Math.PI) * (distancesInMeters / 6378137) / cos(long) * cos(deg)
val newLat = lat + (180 / Math.PI) * (distancesInMeters / 6378137) / sin(lat) * sin(deg);
val newLong =
long + (180 / Math.PI) * (distancesInMeters / 6378137) / cos(lat) * cos(deg) //cos(long) * cos(deg)
val newLat =
lat + (180 / Math.PI) * (distancesInMeters / 6378137) * sin(deg) // sin(lat) * sin(deg)
return Point.fromLngLat(newLong, newLat)
}