public ScaleMatrix4(Vec4 v)
{
base.init();
x = v.X;
y = v.Y;
z = v.Z;
Update();
}
public override void Update()
{
SetIdentity();
double xDelta = right - left;
double yDelta = top - bottom;
double zDelta = far - near;
Vec4 sVec = new Vec4(2 / xDelta, 2/yDelta, 2/zDelta);
Vec4 tVec = new Vec4(-((right + left) / xDelta), -((top + bottom) / yDelta), -((far + near) / zDelta));
Set(new TranslateMatrix4(tVec) * new ScaleMatrix4(sVec));
}
public Vec4(Vec4 original)
{
Set(original.X, original.Y, original.Z, 1);
}
public bool EqualTo3D(Vec4 v)
{
return ((X == v.X) && (Y == v.Y) && (Z == v.Z));
}
public bool EqualTo2D(Vec4 v)
{
return ((X == v.X) && (Y == v.Y));
}
public bool EqualTo(Vec4 v)
{
return ((X == v.X) && (Y == v.Y) && (Z == v.Z) && (W == v.W));
}
public double Dot(Vec4 b)
{
return b.X * x + b.Y * y + b.Z * z + b.W * w;
}
public static Vec4 operator *(Matrix4 m, Vec4 v)
{
Collection<double> res = new Collection<double>();
Collection<double> vCol = v.GetCollection();
for (int i = 0; i < 4; i++)
{
Collection<double> mCol = m.GetRow(i);
double tmp = 0;
for (int j = 0; j < 4; j++)
tmp += mCol[j] * vCol[j];
res.Add(tmp);
}
// Und da der Vektor hier nicht unbedingt homogenisiert ist, holen wir das einfach nach
Vec4 tmpVec = new Vec4(res);
if (tmpVec.W != 0)
tmpVec.Homogenize();
return tmpVec;
}