Add scala angle multiplication

gemini-hlsw · Oct 2, 2023 · fee13bf · fee13bf
1 parent d108bec
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diff --git a/modules/core/shared/src/main/scala/lucuma/core/math/Angle.scala b/modules/core/shared/src/main/scala/lucuma/core/math/Angle.scala
@@ -300,6 +300,20 @@ object Angle extends AngleOptics {
     def -(a: Angle): Angle =
       Angle.fromMicroarcseconds(toMicroarcseconds - a.toMicroarcseconds)
 
+    /**
+    * Scalar multiplication of this angle and `a`. Exact
+    * @group Operations
+    */
+    def *(a: Long): Angle =
+      Angle.fromMicroarcseconds(toMicroarcseconds * a)
+
+    /**
+    * Scalar multiplication of this angle and `a`. approximate
+    * @group Operations
+    */
+    def *?(a: Double): Angle =
+      Angle.fromMicroarcseconds((toMicroarcseconds * a).toLong)
+
     /**
     * This angle as an Offset.P. Exact, invertible.
     *

diff --git a/modules/tests/shared/src/test/scala/lucuma/core/math/AngleSuite.scala b/modules/tests/shared/src/test/scala/lucuma/core/math/AngleSuite.scala
@@ -182,4 +182,22 @@ final class AngleSuite extends munit.DisciplineSuite {
       assertEquals(a.tan, scala.math.tan(a.toDoubleRadians))
     }
   }
+
+  test("Scalar int multiplication") {
+    assertEquals(Angle.Angle0 * 2, Angle.Angle0)
+    assertEquals(Angle.Angle90 * 2, Angle.Angle180)
+    assertEquals(Angle.Angle90 * 4, Angle.Angle0)
+    assertEquals(Angle.Angle90 * -2, Angle.Angle180)
+    assertEquals(Angle.Angle90 * 10, Angle.Angle180)
+  }
+
+  test("Scalar double multiplication") {
+    assertEquals(Angle.Angle0 *? 2, Angle.Angle0)
+    assertEquals(Angle.Angle90 *? 2, Angle.Angle180)
+    assertEquals(Angle.Angle90 *? 4, Angle.Angle0)
+    assertEquals(Angle.Angle90 *? -2, Angle.Angle180)
+    assertEquals(Angle.Angle90 *? 10, Angle.Angle180)
+    assertEquals(Angle.Angle180 *? 0.5, Angle.Angle90)
+    assert(((Angle.Angle180 *? 0.001) - Angle.fromDoubleDegrees(0.18)).toMicroarcseconds < 1000)
+  }
 }