Add VerticalExaggerationSpec

packages/engine/Specs/Core/VerticalExaggerationSpec.js

@@ -0,0 +1,126 @@
+import {
+  Cartesian3,
+  Ellipsoid,
+  VerticalExaggeration,
+  Math as CesiumMath,
+} from "../../index.js";
+
+describe("Core/VerticalExaggeration", function () {
+  it("getHeight leaves heights unchanged with a scale of 1.0", function () {
+    const height = 100.0;
+    const scale = 1.0;
+    const relativeHeight = 0.0;
+
+    const result = VerticalExaggeration.getHeight(
+      height,
+      scale,
+      relativeHeight
+    );
+    expect(result).toEqual(height);
+  });
+
+  it("getHeight scales up heights above relativeHeight", function () {
+    const height = 150.0;
+    const scale = 2.0;
+    const relativeHeight = 100.0;
+
+    const result = VerticalExaggeration.getHeight(
+      height,
+      scale,
+      relativeHeight
+    );
+    expect(result).toEqual(200.0);
+  });
+
+  it("getHeight does not change heights equal to relativeHeight", function () {
+    const height = 100.0;
+    const scale = 1.0;
+    const relativeHeight = 100.0;
+
+    const result = VerticalExaggeration.getHeight(
+      height,
+      scale,
+      relativeHeight
+    );
+    expect(result).toEqual(100.0);
+  });
+
+  it("getHeight scales down heights below relativeHeight", function () {
+    const height = 100.0;
+    const scale = 2.0;
+    const relativeHeight = 200.0;
+
+    const result = VerticalExaggeration.getHeight(
+      height,
+      scale,
+      relativeHeight
+    );
+    expect(result).toEqual(0.0);
+  });
+
+  it("getPosition leaves positions unchanged with a scale of 1.0", function () {
+    const position = Cartesian3.fromRadians(0.0, 0.0, 100.0);
+    const ellipsoid = Ellipsoid.WGS84;
+    const verticalExaggeration = 1.0;
+    const verticalExaggerationRelativeHeight = 0.0;
+
+    const result = VerticalExaggeration.getPosition(
+      position,
+      ellipsoid,
+      verticalExaggeration,
+      verticalExaggerationRelativeHeight
+    );
+    expect(result).toEqualEpsilon(position, CesiumMath.EPSILON8);
+  });
+
+  it("getPosition scales up positions above relativeHeight", function () {
+    const position = Cartesian3.fromRadians(0.0, 0.0, 150.0);
+    const ellipsoid = Ellipsoid.WGS84;
+    const verticalExaggeration = 2.0;
+    const verticalExaggerationRelativeHeight = 100.0;
+
+    const result = VerticalExaggeration.getPosition(
+      position,
+      ellipsoid,
+      verticalExaggeration,
+      verticalExaggerationRelativeHeight
+    );
+    expect(result).toEqualEpsilon(
+      Cartesian3.fromRadians(0.0, 0.0, 200.0),
+      CesiumMath.EPSILON8
+    );
+  });
+
+  it("getPosition does not change positions equal to relativeHeight", function () {
+    const position = Cartesian3.fromRadians(0.0, 0.0, 100.0);
+    const ellipsoid = Ellipsoid.WGS84;
+    const verticalExaggeration = 1.0;
+    const verticalExaggerationRelativeHeight = 100.0;
+
+    const result = VerticalExaggeration.getPosition(
+      position,
+      ellipsoid,
+      verticalExaggeration,
+      verticalExaggerationRelativeHeight
+    );
+    expect(result).toEqualEpsilon(position, CesiumMath.EPSILON8);
+  });
+
+  it("getPosition scales down positions below relativeHeight", function () {
+    const position = Cartesian3.fromRadians(0.0, 0.0, 100.0);
+    const ellipsoid = Ellipsoid.WGS84;
+    const verticalExaggeration = 2.0;
+    const verticalExaggerationRelativeHeight = 200.0;
+
+    const result = VerticalExaggeration.getPosition(
+      position,
+      ellipsoid,
+      verticalExaggeration,
+      verticalExaggerationRelativeHeight
+    );
+    expect(result).toEqualEpsilon(
+      Cartesian3.fromRadians(0.0, 0.0, 0.0),
+      CesiumMath.EPSILON8
+    );
+  });
+});