/// <summary>
/// 是否与...平行
/// </summary>
/// <param name="line"></param>
/// <returns></returns>
public bool IsParallel(TLine line)
{
if (b == 0 && line.b == 0 ||
b != 0 && line.b != 0 && k == line.k)
{
return(true);
}
return(false);
}
public Vector2 CrossWith(TLine line)
{
if (IsParallel(line))
{
return(new Vector2(float.NaN, float.NaN));
}
float d = line.a;
float e = line.b;
float f = line.c;
float x = (b * f - c * e) / (a * e - b * d);
float y = (c * d - a * f) / (a * e - b * d);
Vector2 crossPoint = new Vector2(x, y);
return(crossPoint);
}
/// <summary>
/// 如果超出边界，按照Pos到Center线段与矩形边框交叉点,作为返回值
/// </summary>
/// <param name="pos"></param>
/// <returns></returns>
public Vector2 MakePosInside(Vector2 pos)
{
TLine centerToPos = new TLine(center, pos);
if (pos.x < left)
{
TLine line = new TLine(new Vector2(left, top), new Vector2(left, bottom));
Vector2 crsp = line.CrossWith(centerToPos);
if (crsp.y <= top && crsp.y >= bottom)
{
pos.x = left;
pos.y = crsp.y;
}
}
else if (pos.x > right)
{
TLine line = new TLine(new Vector2(right, top), new Vector2(right, bottom));
Vector2 crsp = line.CrossWith(centerToPos);
if (crsp.y <= top && crsp.y >= bottom)
{
pos.x = right;
pos.y = crsp.y;
}
}
if (pos.y < bottom)
{
TLine line = new TLine(new Vector2(left, bottom), new Vector2(right, bottom));
Vector2 crsp = line.CrossWith(centerToPos);
if (crsp.x <= right && crsp.x >= left)
{
pos.x = crsp.x;
pos.y = bottom;
}
}
else if (pos.y > top)
{
TLine line = new TLine(new Vector2(left, top), new Vector2(right, top));
Vector2 crsp = line.CrossWith(centerToPos);
if (crsp.x <= right && crsp.x >= left)
{
pos.x = crsp.x;
pos.y = top;
}
}
return(pos);
}