public void InitAtoms(int maxX, int maxY, int length, int atomCounts)
{
MaxX = maxX;
MaxY = maxY;
Length = length;
MaxPositionX = maxX * length;
MaxPositionY = maxY * length;
Random rPX = new Random();
Random rPY = new Random();
Random rPV = new Random();
Random rx = new Random();
Random ry = new Random();
for (int i = 0; i < atomCounts; i++)
{
var atom = new AtomExtend()
{
Order = i + 1,
PositionX = rPX.Next(MaxPositionX),
PositionY = rPX.Next(MaxPositionY),
Velocity = rPX.NextDouble() * 8,
DirectionX = (short)rPX.Next(10),
DirectionY = (short)rPX.Next(10),
};
atom = DismantleVelocity(atom);
Atoms.Add(atom);
}
}
/// <summary>
/// 超出边框时，修改位置运动方向
/// </summary>
/// <returns></returns>
public AtomExtend ChangePositionAndDirection(AtomExtend atom)
{
if (atom.TempPositionX < 0) // 超出左边框
{
atom.TempPositionX = -atom.TempPositionX;
atom.TempDirectionX = (short)-atom.TempDirectionX;
}
if (atom.TempPositionY < 0) // 超出上边框
{
atom.TempPositionY = -atom.TempPositionY;
atom.TempDirectionY = (short)-atom.TempDirectionY;
}
if (atom.TempPositionX > MaxPositionX) // 超出右边框
{
atom.TempPositionX = 2 * MaxPositionX - atom.TempPositionX;
atom.TempDirectionX = (short)-atom.TempDirectionX;
}
if (atom.TempPositionY > MaxPositionX) // 超出下边框
{
atom.TempPositionY = 2 * MaxPositionX - atom.TempPositionY;
atom.TempDirectionY = (short)-atom.TempDirectionY;
}
return(atom);
}
public AtomExtend TryMove(AtomExtend atom)
{
atom = SetTempPositionAndDirection(atom);
// 容器之内
// (atom.TempPositionX >= 0 && atom.TempPositionX <= MaxX) && (atom.TempPositionY >= 0 && atom.TempPositionY <= MaxY)
bool hasChangePositionAndDirection = false;
while (((atom.TempPositionX >= 0 && atom.TempPositionX <= MaxPositionX) &&
(atom.TempPositionY >= 0 && atom.TempPositionY <= MaxPositionY)) == false)
{
hasChangePositionAndDirection = true;
// 位置超出容器范围，碰撞到容器壁反弹，需要计算新的运动方向
atom = ChangePositionAndDirection(atom);
}
atom.PositionX = atom.TempPositionX;
atom.PositionY = atom.TempPositionY;
if (hasChangePositionAndDirection)
{
atom.DirectionX = atom.TempDirectionX;
atom.DirectionY = atom.TempDirectionY;
atom = DismantleVelocity(atom);
}
return(atom);
}
/// <summary>
/// 临时设置位置
/// 要经过判断才生效
/// </summary>
/// <param name="atom"></param>
/// <returns></returns>
public AtomExtend SetTempPositionAndDirection(AtomExtend atom)
{
atom.TempPositionX = atom.PositionX + atom.MoveDistanceX;
atom.TempPositionY = atom.PositionY + atom.MoveDistanceY;
atom.TempDirectionX = atom.DirectionX;
atom.TempDirectionY = atom.DirectionY;
return(atom);
}
/// <summary>
/// 分解移动速度到移动向量
/// 速度或移动方向改变时，调用
/// </summary>
/// <param name="atom"></param>
/// <param name="signX">+1 or -1</param>
/// <param name="singY">+1 or -1</param>
/// <returns></returns>
public AtomExtend DismantleVelocity(AtomExtend atom)
{
if (atom.DirectionX == 0 && atom.DirectionY == 0)
{
atom.MoveDistanceX = 0;
atom.MoveDistanceY = 0;
}
else
{
// 直角三角形，知 直角边比值，和斜边长度，求两个直角边
// 假设 比值为 a:b = am:bm，先求m
double m = Math.Sqrt(Math.Pow(atom.Velocity, 2) / (Math.Pow(atom.DirectionX, 2) + Math.Pow(atom.DirectionY, 2)));
int distanceX = Math.Abs((int)(atom.DirectionX * m + 0.5)); // +0.5是为四舍五入
int distanceY = Math.Abs((int)(atom.DirectionY * m + 0.5)); // +0.5是为四舍五入
atom.MoveDistanceX = atom.DirectionX > 0 ? distanceX : -distanceX;
atom.MoveDistanceY = atom.DirectionY > 0 ? distanceY : -distanceY;
}
return(atom);
}
