Merge pull request #115 from group22DKE/air_pressure_scaling

Created method which returns a scaled version of air pressure at point.

app/src/main/java/src/land/LandingController.java

@@ -198,4 +198,21 @@ else if (height>=50000 && height<200000) {
 			return randValue;
 		}
 	}
+
+	public double airPressureScaling(Vector3d point, double radius) {
+
+		double atmosphereMaxRange = 600000;
+		double originToPoint = point.dist(new Vector3d());
+		double realDistance = originToPoint - radius;
+
+		if (realDistance>=atmosphereMaxRange) {
+			return 0;
+		}
+		else if (-radius<realDistance && realDistance<=0) {			//touching or inside the planet
+			return airPresSeaLevel;
+		}
+
+		double scaleOfDistance = realDistance/atmosphereMaxRange;
+		return scaleOfDistance*airPresSeaLevel;
+	}
 }

app/src/test/java/src/test/TestLandingController.java

@@ -259,4 +259,35 @@ void logBallFallFromOrbit()
 		System.out.println(control.airPressureAt(position));
 	}
 
+
+	/*
+	 * Partitions:
+	 * Out of the atmosphere's range
+	 * In the atmoshpere's range
+	 * Touching the radius
+	 * On/inside the planet 
+	 */
+	@Test void testAirPresScalingAboveMax() {
+		LandingController control = new LandingController();
+		Vector3d position = new Vector3d(0,2e25,0);
+		System.out.println(control.airPressureScaling(position,1000));
+	}
+
+	@Test void testAirPresScalingZero() {
+		LandingController control = new LandingController();
+		Vector3d position = new Vector3d(0,10,0);
+		System.out.println(control.airPressureScaling(position,10));
+	}
+
+	@Test void testAirPresScalingBelowZero() {
+		LandingController control = new LandingController();
+		Vector3d position = new Vector3d(0,9,0);
+		System.out.println(control.airPressureScaling(position,10));
+	}
+
+	@Test void testAirPresScalingHalfway() {
+		LandingController control = new LandingController();
+		Vector3d position = new Vector3d(0,500000,0);
+		System.out.println(control.airPressureScaling(position,200000));
+	}
 }