/// <summary>
/// 计算两个rect的距离
/// 相交 返回-1
/// 相切 返回0
/// 分离 返回最短距离
/// </summary>
/// <param name="other"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
public double distance_to_rect(MyRect other, out double x, out double y)
{
x = MyRect.distance_between_sections(this.leftright.x, this.rightup.x,
other.leftright.x, other.rightup.x);
y = MyRect.distance_between_sections(this.leftright.y, this.rightup.y,
other.leftright.y, other.rightup.y);
if (x < 0 && y < 0)//x和y方向是相交 两个rect才是相交
{
return(-1);
}
else if (x + y == -1)//有一个方向相切 一个相交，两个rect是相切
{
return(0);
}
else if (x == 0 && y == 0)//x和y方向是相切 两个rect是相切
{
return(0);
}
else//两个rect分离 返回最短距离
{
if (x < 0)
{
return(y);
}
if (y < 0)
{
return(x);
}
return(Math.Sqrt(x * x + y * y));
}
}
public MyRect intersection(MyRect other)
{
double a, b;
bool flag;
//分成两个方向计算
flag = MyRect.intersection_between_sections(
this.leftright.x, this.rightup.x,
other.leftright.x, other.rightup.x,
out a, out b);
if (!flag)
{
return(null);
}
double a1, b1;
flag = MyRect.intersection_between_sections(
this.leftright.y, this.rightup.y,
other.leftright.y, other.rightup.y,
out a1, out b1);
if (!flag)
{
return(null);
}
return(new MyRect(new Vector3D(a, a1), new Vector3D(b, b1)));
}