public static Vector2 NextVec2CircularEven(this UnifiedRandom rand, float halfWidth, float halfHeight)
{
double x = rand.NextDouble();
double y = rand.NextDouble();
if (x + y > 1)
{
x = 1 - x;
y = 1 - y;
}
double s = 1 / (x + y);
if (double.IsNaN(s))
{
return(Vector2.Zero);
}
s *= s;
s = Math.Sqrt(x * x * s + y * y * s);
s = 1 / s;
x *= s;
y *= s;
double angle = rand.NextDouble() * (2 * Math.PI);
double cos = Math.Cos(angle);
double sin = Math.Sin(angle);
return(new Vector2((float)(x * cos - y * sin) * halfWidth, (float)(x * sin + y * cos) * halfHeight));
}
//private Node _build2(Node node, Vector2 pos, Vector2 vel, bool isMain, Vector2 target) {
// cnt++;
// keyPoints.Add(pos);
// // 终止条件：树枝太细了，或者太短了
// if (node.size < 0.1f || node.length < 1) return node;
// var r2 = (target - pos).ToRotation() - vel.ToRotation();
// var r = r2 + rand(MathHelper.Pi / 4f);
// Vector2 unit = (vel.ToRotation() + r).ToRotationVector2();
// Node main = new Node(rand(r), node.size * 0.95f, node.length);
// node.children.Add(_build(main, pos + unit * node.length, unit, isMain, target));
// // 只有较小的几率出分支
// if (rand() > 0.9f) {
// // 生成分支的时候长度变化不大，但是大小变化很大
// r = rand(MathHelper.Pi / 3f);
// unit = (vel.ToRotation() + r).ToRotationVector2();
// Node child = new Node(r, node.size * 0.6f, node.length);
// node.children.Add(_build(child, pos + unit * node.length, unit, false, target));
// }
// return node;
//}
//private Node _build(Node node, Vector2 pos, Vector2 vel, bool root) {
// keyPoints.Add(pos);
// cnt++;
// if (node.size < 0.1f || node.length < 1) return node;
// var r2 = (target - pos).ToRotation() - vel.ToRotation();
// var r = r2 + rand(MathHelper.Pi / 4f);
// var unit = (vel.ToRotation() + r).ToRotationVector2();
// Node rchild = new Node(r, node.size * 0.9f, node.length);
// // 闪电树主节点（树干）
// node.children.Add(_build(rchild, pos + unit * node.length, unit, root));
// if (root) {
// if (rand() > 0.8f) {
// for (int i = 0; i < 1; i++) {
// r = rand(MathHelper.Pi / 3f);
// unit = (vel.ToRotation() + r).ToRotationVector2();
// Node child = new Node(r, rand() * node.size * 0.6f, node.length * 0.6f);
// node.children.Add(_build(child, pos + unit * node.length, unit, false));
// }
// }
// }
// return node;
//}
private float rand()
{
double u = -2 * Math.Log(random.NextDouble());
double v = 2 * Math.PI * random.NextDouble();
return((float)Math.Max(0, Math.Sqrt(u) * Math.Cos(v) * 0.3 + 0.5));
}
public void ResetLantern(int i)
{
_lanterns[i].Depth = (1f - (float)i / (float)_lanterns.Length) * 4.4f + 1.6f;
_lanterns[i].Speed = -1.5f - 2.5f * (float)_random.NextDouble();
_lanterns[i].Texture = _texture.get_Value();
_lanterns[i].Variant = _random.Next(3);
_lanterns[i].TimeUntilFloat = (int)((float)(2000 + _random.Next(1200)) * 2f);
_lanterns[i].TimeUntilFloatMax = _lanterns[i].TimeUntilFloat;
}
public void ResetBalloon(int i)
{
_balloons[i].Depth = (float)i / (float)_balloons.Length * 1.75f + 1.6f;
_balloons[i].Speed = -1.5f - 2.5f * (float)_random.NextDouble();
_balloons[i].Texture = _textures[_random.Next(2)].Value;
_balloons[i].Variant = _random.Next(3);
if (_random.Next(30) == 0)
{
_balloons[i].Texture = _textures[2].Value;
}
}
private void GenerateSlimes()
{
_slimes = new Slime[Main.maxTilesY / 6];
for (int i = 0; i < _slimes.Length; i++)
{
int num = (int)((double)Main.screenPosition.Y * 0.7 - (double)Main.screenHeight);
int minValue = (int)((double)num - Main.worldSurface * 16.0);
_slimes[i].Position = new Vector2(_random.Next(0, Main.maxTilesX) * 16, _random.Next(minValue, num));
_slimes[i].Speed = 5f + 3f * (float)_random.NextDouble();
_slimes[i].Depth = (float)i / (float)_slimes.Length * 1.75f + 1.6f;
_slimes[i].Texture = _textures[_random.Next(2)].get_Value();
if (_random.Next(60) == 0)
{
_slimes[i].Texture = _textures[3].get_Value();
_slimes[i].Speed = 6f + 3f * (float)_random.NextDouble();
_slimes[i].Depth += 0.5f;
}
else if (_random.Next(30) == 0)
{
_slimes[i].Texture = _textures[2].get_Value();
_slimes[i].Speed = 6f + 2f * (float)_random.NextDouble();
}
_slimes[i].Active = true;
}
_slimesRemaining = _slimes.Length;
}
public override void Update(float elapsedTime)
{
UpdateEyelid(elapsedTime);
bool num = _timeUntilPupilMove <= 0f;
_pupilOffset = (_targetOffset + _pupilOffset) * 0.5f;
_timeUntilPupilMove -= elapsedTime;
if (num)
{
float num2 = (float)_random.NextDouble() * ((float)Math.PI * 2f);
float scaleFactor;
if (_isSpawning)
{
_timeUntilPupilMove = (float)_random.NextDouble() * 0.4f + 0.3f;
scaleFactor = (float)_random.NextDouble() * 0.7f;
}
else
{
_timeUntilPupilMove = (float)_random.NextDouble() * 0.4f + 0.6f;
scaleFactor = (float)_random.NextDouble() * 0.3f;
}
_targetOffset = new Vector2((float)Math.Cos(num2), (float)Math.Sin(num2)) * scaleFactor;
}
}
/*
* Returns a random position near the position given.
*
* rand : a Random to use to get the position.
* minDistance : the minimum amount of distance from the position.
* maxDistance : the maximum amount of distance from the position.
* circular : If true, gets a random point around a circle instead of a square.
*/
public static Vector2 GetRandomPosNear(Vector2 pos, UnifiedRandom rand, int minDistance, int maxDistance, bool circular = false)
{
int distance = maxDistance - minDistance;
if (!circular)
{
float newPosX = pos.X + (Main.rand.Next(2) == 0 ? -(minDistance + rand.Next(distance)) : (minDistance + rand.Next(distance)));
float newPosY = pos.Y + (Main.rand.Next(2) == 0 ? -(minDistance + rand.Next(distance)) : (minDistance + rand.Next(distance)));
return(new Vector2(newPosX, newPosY));
}
else
{
return(RotateVector(pos, pos + new Vector2(minDistance + rand.Next(distance)), MathHelper.Lerp(0, (float)(Math.PI * 2f), (float)rand.NextDouble())));
}
}
public static bool NextBool(this UnifiedRandom r) => r.NextDouble() < .5;
public static float NextFloat(this UnifiedRandom r, float minValue, float maxValue) => (float)r.NextDouble() * (maxValue - minValue) + minValue;
/// <summary> /// Equal chance to return true or false. /// </summary> /// <param name="rand"></param> /// <returns>Equal chance for true or false</returns> public static bool NextBool(this UnifiedRandom rand) => rand.NextDouble() < 0.5;