Fix for #20 - auto-scale for single point

demo/trajectory-playground/src/jvmMain/kotlin/Main.kt

@@ -157,6 +157,14 @@ fun doubleObstacle() {
     }
 }
 
+@Composable
+@Preview
+fun singleElement() {
+    SchemeView {
+        points(listOf(XY(1f,1f)))
+    }
+}
+
 
 @Composable
 @Preview
@@ -165,6 +173,7 @@ fun playground() {
         "Close starting points",
         "Single obstacle",
         "Two obstacles",
+        "Single element"
     )
 
     var currentExample by remember { mutableStateOf(examples.first()) }
@@ -182,6 +191,7 @@ fun playground() {
             examples[0] -> closePoints()
             examples[1] -> singleObstacle()
             examples[2] -> doubleObstacle()
+            examples[3] -> singleElement()
         }
     }
 }

maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/MapViewScope.kt

@@ -63,7 +63,7 @@ public class MapViewScope internal constructor(
                 canvasSize.width.value / rectangle.longitudeDelta.radians,
                 canvasSize.height.value / rectangle.latitudeDelta.radians
             ) * 2 * PI / mapTileProvider.tileSize
-        )
+        ).coerceIn(0.0..22.0)
         return space.ViewPoint(rectangle.center, zoom.toFloat())
     }
 

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

@@ -26,12 +26,15 @@ public class XYViewScope(
     )
 
     override fun computeViewPoint(rectangle: Rectangle<XY>): ViewPoint<XY> {
-        val scale = min(
+        val scale: Float = min(
             canvasSize.width.value / rectangle.width,
             canvasSize.height.value / rectangle.height
         )
-
-        return XYViewPoint(rectangle.center, scale)
+        return if(scale.isInfinite()){
+            XYViewPoint(rectangle.center, 1f)
+        } else {
+            XYViewPoint(rectangle.center, scale)
+        }
     }
 
     override fun ViewPoint<XY>.moveBy(x: Dp, y: Dp): ViewPoint<XY> {