Add toString to curves and correct rounding normalization for angles

build.gradle.kts

@@ -10,7 +10,7 @@ val ktorVersion by extra("2.0.3")
 
 allprojects {
     group = "center.sciprog"
-    version = "0.1.0-dev-6"
+    version = "0.1.0-dev-7"
 }
 
 ksciencePublish{

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

@@ -7,6 +7,7 @@ package center.sciprog.maps.coordinates
 
 import kotlin.jvm.JvmInline
 import kotlin.math.PI
+import kotlin.math.floor
 
 // Taken from KMath dev version, to be used directly in the future
 
@@ -82,11 +83,9 @@ public value class Degrees(public val value: Double) : Angle {
 public val Number.degrees: Degrees get() = Degrees(toDouble())
 
 /**
- * Normalized angle to (0, 2PI) for radians or (0, 360) for degrees.
+ * Normalized angle 2 PI range symmetric around [center]. By default, uses (0, 2PI) range.
  */
-public fun Angle.normalized(): Angle = when (this) {
-    is Degrees -> value.mod(360.0).degrees
-    is Radians -> value.mod(PI * 2).radians
-}
+public fun Angle.normalized(center: Angle = Angle.pi): Angle =
+    this - Angle.piTimes2 * floor((radians.value + PI - center.radians.value) / PI/2)
 
 public fun abs(angle: Angle): Angle = if (angle < Angle.zero) -angle else angle

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

@@ -1,7 +1,5 @@
 package center.sciprog.maps.coordinates
 
-import kotlin.math.PI
-
 /**
  * Geodetic coordinated
  */
@@ -9,10 +7,10 @@ public class GeodeticMapCoordinates(
     public val latitude: Angle,
     longitude: Angle,
 ) {
-    public val longitude: Radians = longitude.radians.value.rem(PI / 2).radians
+    public val longitude: Angle = longitude.normalized(Angle.zero)
 
     init {
-        require(latitude.radians.value in (-PI / 2)..(PI / 2)) { "Latitude $latitude is not in (-PI/2)..(PI/2)" }
+        require(latitude in (-Angle.piDiv2)..(Angle.piDiv2)) { "Latitude $latitude is not in (-PI/2)..(PI/2)" }
     }
 
     override fun equals(other: Any?): Boolean {

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

@@ -10,11 +10,15 @@ import kotlin.math.*
  * @param forward coordinate of a start point with forward direction
  * @param backward coordinate of an end point with backward direction
  */
-public class GmcCurve internal constructor(
+public class GmcCurve(
     public val forward: GmcPose,
     public val backward: GmcPose,
     public val distance: Distance,
-)
+){
+    override fun toString(): String {
+        return "GmcCurve(from: ${forward.coordinates}, to: ${backward.coordinates})"
+    }
+}
 
 public fun GmcCurve.reversed(): GmcCurve = GmcCurve(backward, forward, distance)
 
@@ -222,6 +226,8 @@ public fun GeoEllipsoid.curveBetween(start: Gmc, end: Gmc, precision: Double = 1
     val a = equatorRadius
     val b = polarRadius
 
+    if(start == end) error("Can't compute a curve because start and end coincide at $start")
+
     // get parameters as radians
     val phi1 = start.latitude
     val lambda1 = start.longitude
@@ -232,7 +238,7 @@ public fun GeoEllipsoid.curveBetween(start: Gmc, end: Gmc, precision: Double = 1
     val a2 = a.kilometers * a.kilometers
     val b2 = b.kilometers * b.kilometers
     val a2b2b2 = (a2 - b2) / b2
-    val omega: Radians = lambda2 - lambda1
+    val omega: Angle = lambda2 - lambda1
     val tanphi1: Double = tan(phi1)
     val tanU1 = (1.0 - f) * tanphi1
     val U1: Double = atan(tanU1)
@@ -256,7 +262,7 @@ public fun GeoEllipsoid.curveBetween(start: Gmc, end: Gmc, precision: Double = 1
 
     var sigma = 0.0
     var deltasigma = 0.0
-    var lambda0: Radians
+    var lambda0: Angle
     var converged = false
     for (i in 0..19) {
         lambda0 = lambda
@@ -326,8 +332,7 @@ public fun GeoEllipsoid.curveBetween(start: Gmc, end: Gmc, precision: Double = 1
             alpha1 = 0.0.radians
             alpha2 = pi.radians
         } else {
-            alpha1 = Double.NaN.radians
-            alpha2 = Double.NaN.radians
+            error("Start and end point coinside.")
         }
     } else {
         // eq. 20

maps-kt-core/src/commonTest/kotlin/center/sciprog/maps/coordinates/AngleTest.kt

@@ -8,5 +8,9 @@ class AngleTest {
     fun normalization(){
         assertEquals(30.degrees, 390.degrees.normalized())
         assertEquals(30.degrees, (-330).degrees.normalized())
+        assertEquals(200.degrees, 200.degrees.normalized())
+        assertEquals(30.degrees, 390.degrees.normalized(Angle.zero))
+        assertEquals(30.degrees, (-330).degrees.normalized(Angle.zero))
+        assertEquals((-160).degrees, 200.degrees.normalized(Angle.zero))
     }
 }