public void InitializeSpringMassSystem_test_stiffness()
{
CreateLines cl = new CreateLines();
SpringMassSystem sms = new SpringMassSystem(0.01f, 1.0f, 1.0f, 0.15f, 0.0f, 40.0f); //range of 0-40s with data points every 0.5s
Assert.IsTrue(Mathf.Approximately((float)sms.Stiffness, 1.0f));
}
public void SetInitialCondition_timeOutOfBounds()
{
//Create a SpringMassSystem with zero damping and stiffness.
//This should produce solution of constant velocity
SpringMassSystem sms = new SpringMassSystem(0.1, 0, 1, 0, 0, 0.1);
sms.SetInitialCondition(-1, 1, 0); //should sit at x=1
//check velocity at t=0
Assert.IsNaN(sms.Velocity(0));
}
public void ConstructAndReadForwardSolveTime()
{
//Create a SpringMassSystem with zero damping and stiffness.
//This should produce solution of constant velocity
SpringMassSystem sms = new SpringMassSystem(0.1, 0, 1, 0, 0, 0.1);
sms.SetInitialCondition(0, 1, 0); //should sit at x=1
//Read parameters
Assert.AreEqual(0.1, sms.ForwardSolveTime, single_value_required_accuracy);
}
public void Constructor_doesNotSetToZero()
{
//Create a SpringMassSystem with zero damping and stiffness.
//This should produce solution of constant velocity
SpringMassSystem sms = new SpringMassSystem(0.1, 0, 0, 0, 0, 0.1);
sms.SetInitialCondition(0, 1, 0); //should sit at x=1
//Read parameters
Assert.AreNotEqual(0, sms.Mass);
}
public void SetMass()
{
//Create a SpringMassSystem with zero damping and stiffness.
//This should produce solution of constant velocity
SpringMassSystem sms = new SpringMassSystem(0.1, 0, 1, 0, 0, 0.1);
sms.SetInitialCondition(0, 1, 0); //should sit at x=1
//Change parameter
sms.Mass = 5;
//Read parameters
Assert.AreEqual(5, sms.Mass);
}
public void ReadVelocity_OutOfBoundsNegative()
{
//Create a SpringMassSystem with zero damping and stiffness.
//This should produce solution of constant velocity
SpringMassSystem sms = new SpringMassSystem(0.1, 0, 1, 0, 0, 0.1);
sms.SetInitialCondition(0, 1, 0); //should sit at x=1
//Update to t=1
sms.Update(1);
//check velocity at t=-2
Assert.IsNaN(sms.Velocity(-2));
}
public void Update_reverse()
{
//Create a SpringMassSystem with zero damping and stiffness.
//This should produce solution of constant velocity
SpringMassSystem sms = new SpringMassSystem(0.1, 0, 1, 0, 0, 0.1);
sms.SetInitialCondition(0, 1, 0); //should sit at x=1
//Update to t=-1
sms.Update(-1);
//check position at t=0
Assert.AreEqual(1, sms.Position(0), general_purpose_required_accuracy);
}
public void ForwardSolveTime_viaConstructor()
{
//Create a SpringMassSystem with zero damping and stiffness.
//This should produce solution of constant velocity
SpringMassSystem sms = new SpringMassSystem(0.1, 0, 1, 0, 0, 0.2);
sms.SetInitialCondition(0, 1, 0); //should sit at x=1
//Update to t=1
sms.Update(1);
//check velocity at t=1.2
Assert.AreEqual(1, sms.Position(1.2), general_purpose_required_accuracy);
}
public void Update_andCheckPosition_afterMoving()
{
//Create a SpringMassSystem with zero damping and stiffness.
//This should produce solution of constant velocity
SpringMassSystem sms = new SpringMassSystem(0.1, 0, 1, 0, 0, 0.1);
sms.SetInitialCondition(0, 1, 1); //should travel linearly in time
//Update to t=1
sms.Update(1);
//check velocity at t=1.
Assert.AreEqual(2, sms.Position(1), general_purpose_required_accuracy);
}
public void InitializeSimulation()
{
if (friction == 0)
{
friction = .15f;
}
if (masss == 0)
{
masss = 1.0f;
}
if (stiffness == 0)
{
stiffness = 1.0f;
}
sms = new SpringMassSystem(0.01f, 1.0f, 1.0f, 0.15f, 0.0f, 40.0f); //range of 0-40s with data points every 0.5s
sms.SetInitialCondition(0f, 1.0f, 0f);
sms.Mass = masss; //mass
sms.Damping = friction; //friction .15f
sms.Stiffness = stiffness; //spring stiffness
//sms.solve(1.0f, 0.0f); //solve with these initial conditions (position, velocity)
//Instance is an array of GameObjects
instance = new GameObject[numLines];
for (int n = 0; n < numLines; n++)
{
//Looping though a specified number of lines that I want,
//I create several line objects (the lines are objects saved in the
//assets in unity.
//These lines are all saved in the instance array for easy access after creation.
//Each line object has a line.cs script attached.
instance[n] = Instantiate(Line, new Vector3(0, 0, n * .8f), transform.rotation);
}
//Finds an object in the scene by name.
plane = GameObject.Find("Plane");
//Changes the color of the floor plane to make it transparent
plane.GetComponent <MeshRenderer>().sharedMaterial.color =
new Color(1.0f, 1.0f, 1.0f, 0.5f);
//Find the mass by name. The coordinates of the mass are
//changed in THIS script by this reference.
mass = GameObject.Find("Mass");
mx = initialX;
spring = GameObject.Find("Spring");
spring.GetComponent <MeshRenderer>().sharedMaterial.color =
new Color(1.0f, 1.0f, 1.0f, 0.5f);
//line that travels with updating segments
lineRenderer = gameObject.AddComponent <LineRenderer>();
lineRenderer.sharedMaterial = new Material(Shader.Find("Particles/Additive"));
lineRenderer.widthMultiplier = 0.1f;
lineRenderer.positionCount = numLines;
float alpha = 1.0f;
Gradient gradient = new Gradient();
gradient.SetKeys(
new GradientColorKey[] { new GradientColorKey(c1, 0.0f), new GradientColorKey(c2, 1.0f) },
new GradientAlphaKey[] { new GradientAlphaKey(alpha, 0.0f), new GradientAlphaKey(alpha, 1.0f) }
);
lineRenderer.colorGradient = gradient;
}
