Make elevation optional for Gmc

build.gradle.kts

@@ -8,7 +8,7 @@ plugins {
 
 allprojects {
     group = "center.sciprog"
-    version = "0.2.1-dev-3"
+    version = "0.2.1-dev-4"
 }
 
 ksciencePublish{

maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/coordinates/GeodeticMapCoordinates.kt

@@ -2,11 +2,13 @@ package center.sciprog.maps.coordinates
 
 /**
  * Geodetic coordinated
+ *
+ * @param elevation is optional
  */
 public class GeodeticMapCoordinates(
     public val latitude: Angle,
     public val longitude: Angle,
-    public val elevation: Distance = 0.kilometers,
+    public val elevation: Distance? = null,
 ) {
     init {
         require(latitude in (-Angle.piDiv2)..(Angle.piDiv2)) { "Latitude $latitude is not in (-PI/2)..(PI/2)" }

maps-kt-geojson/src/commonMain/kotlin/center/sciprog/maps/geojson/GeoJsonGeometry.kt

@@ -37,8 +37,8 @@ internal fun JsonElement.toGmc() = jsonArray.run {
 internal fun Gmc.toJsonArray(): JsonArray = buildJsonArray {
     add(longitude.degrees.value)
     add(latitude.degrees.value)
-    if (elevation.kilometers != 0.0) {
-        add(elevation.meters)
+    elevation?.let {
+        add(it.meters)
     }
 }
 

maps-kt-scheme/src/commonMain/kotlin/center/sciprog/maps/scheme/XYViewScope.kt

@@ -24,6 +24,7 @@ class XYViewScope(
         (canvasSize.width / 2 + (x.dp - viewPoint.focus.x.dp) * viewPoint.zoom),
         (canvasSize.height / 2 + (viewPoint.focus.y.dp - y.dp) * viewPoint.zoom)
     )
+
     override fun computeViewPoint(rectangle: Rectangle<XY>): ViewPoint<XY> {
         val scale = min(
             canvasSize.width.value / rectangle.width,