void GeneratePlanets()
{
if (planets.Count < 1 || planets[0].planetPrefab == null)
{
Debug.LogError("请保证有一个行星数据并且有prefab依赖信息");
return;
}
var templatePrefab = planets[0].planetPrefab;
planets.Clear();
for (var i = 0; i < planetCount; i++)
{
var planet = new Planet();
planet.planetPrefab = templatePrefab;
var orbit = new OrbitalEllipse();
orbit.xExtent = Random.Range(30, 50);
orbit.yExtent = Random.Range(30, 50);
orbit.tilt = Random.Range(0, 70);
planet.orbit = orbit;
planet.hasMoon = Random.Range(1, 100) > 50;
planet.rotationSpeed = Random.Range(10, 100);
planet.orbitDuration = Random.Range(3, 20);
planets.Add(planet);
}
}
// Update the state of the orbiter when its position along the ellipse changes
// Note: Make sure the ellipse is up to date before updating the orbit state
private void Update(float orbiterAngle, Orbiter orbiter, OrbitalEllipse ellipse)
{
this.orbiter = orbiter;
this.ellipse = ellipse;
this.normal = CalcNormal(orbiterAngle);
this.tangent = CalcTangent(normal);
this.position = ellipse.GetPosition(orbiterAngle, orbiter.orbitAround.position);
this.velocity = CalcVelocity(orbiter.orbitSpeed * orbiter.GravityConstant(), position, orbiter.orbitAround.position);
}
// Setup the orbit when the is added
private void Reset()
{
if (orbitAround == null)
{
return;
}
ellipse = new OrbitalEllipse(orbitAround.position, transform.position, apsisDistance, circularOrbit);
apsisDistance = ellipse.endingApsis; // Default to a circular orbit by setting both apses to the same value
}
void DrawOrbitalElipse(LineRenderer line, OrbitalEllipse ellipse)
{
Vector3[] drawPoints = new Vector3[elipseSegments + 1];
for (int i = 0; i < elipseSegments; i++)
{
drawPoints[i] = ellipse.Evaluate(i / (elipseSegments - 1f));
}
drawPoints[elipseSegments] = drawPoints[0];
line.useWorldSpace = false;
line.positionCount = elipseSegments + 1;
line.startWidth = elipseWidth;
line.SetPositions(drawPoints);
}
private void OnDrawGizmosSelected()
{
if (orbitAround == null)
{
return;
}
// This is required for the OrbitRenderer. For some reason the ellipse var is always null
// if it's set anywhere else, even including OnApplicationQuit;
if (ellipse == null)
{
ellipse = new OrbitalEllipse(orbitAround.position, transform.position, apsisDistance, circularOrbit);
}
// Never allow 0 apsis. Start with a circular orbit.
if (apsisDistance == 0)
{
apsisDistance = ellipse.startingApsis;
}
}
//==== Instance Methods ====//
// Constructor
public OrbitState(float angle, Orbiter orbiter, OrbitalEllipse ellipse)
{
Update(angle, orbiter, ellipse);
}
private void OnApplicationQuit()
{
ellipse = new OrbitalEllipse(orbitAround.position, transform.position, apsisDistance, circularOrbit);
}
