/// <summary>
///
/// </summary>
/// <param name="copyFrom">
/// A <see cref="Affine"/>
/// </param>
public Affine(Affine copyFrom)
{
sx = copyFrom.sx;
shy = copyFrom.shy;
shx = copyFrom.shx;
sy = copyFrom.sy;
tx = copyFrom.tx;
ty = copyFrom.ty;
}
//------------------------------------------------------------------------
public Perspective TransPerspectiveMultiplyInverse(Affine m)
{
Affine t = m;
t.Invert();
return Multiply(t);
}
// From affine
public Perspective(Affine a)
{
sx = (a.sx); shy = (a.shy); w0 = (0);
shx = (a.shx); sy = (a.sy); w1 = (0);
tx = (a.tx); ty = (a.ty); w2 = (1);
}
// Multiply inverse of "m" by "this" and assign the result to "this"
public Perspective PreMultiplyInverse(Affine m)
{
Perspective t=new Perspective(m);
t.Invert();
Set(t.Multiply(this));
return this;
}
//------------------------------------------------------------------------
public Perspective PreMultiply(Affine b)
{
Perspective a = new Perspective(this);
sx = a.sx *b.sx + a.shx*b.shy;
shx = a.sx *b.shx + a.shx*b.sy;
tx = a.sx *b.tx + a.shx*b.ty + a.tx;
shy = a.shy*b.sx + a.sy *b.shy;
sy = a.shy*b.shx + a.sy *b.sy;
ty = a.shy*b.tx + a.sy *b.ty + a.ty;
w0 = a.w0 *b.sx + a.w1 *b.shy;
w1 = a.w0 *b.shx + a.w1 *b.sy;
w2 = a.w0 *b.tx + a.w1 *b.ty + a.w2;
return this;
}
//------------------------------------------------------------------------
public Perspective Multiply(Affine a)
{
Perspective b = new Perspective(this);
sx = a.sx *b.sx + a.shx*b.shy + a.tx*b.w0;
shx = a.sx *b.shx + a.shx*b.sy + a.tx*b.w1;
tx = a.sx *b.tx + a.shx*b.ty + a.tx*b.w2;
shy = a.shy*b.sx + a.sy *b.shy + a.ty*b.w0;
sy = a.shy*b.shx + a.sy *b.sy + a.ty*b.w1;
ty = a.shy*b.tx + a.sy *b.ty + a.ty*b.w2;
return this;
}
//--------------------------------------------------------- Operations
public Perspective FromAffine(Affine a)
{
sx = a.sx; shy = a.shy; w0 = 0;
shx = a.shx; sy = a.sy; w1 = 0;
tx = a.tx; ty = a.ty; w2 = 1;
return this;
}
public void SetTransform(Affine value)
{
m_Transform = value;
}
// Multiply matrix to another one
void Multiply(Affine m)
{
double t0 = sx * m.sx + shy * m.shx;
double t2 = shx * m.sx + sy * m.shx;
double t4 = tx * m.sx + ty * m.shx + m.tx;
shy = sx * m.shy + shy * m.sy;
sy = shx * m.shy + sy * m.sy;
ty = tx * m.shy + ty * m.sy + m.ty;
sx = t0;
shx = t2;
tx = t4;
}
///<summary>
///</summary>
///<param name="x"></param>
///<param name="y"></param>
public void Scaling(out double x, out double y)
{
double x1 = 0.0;
double y1 = 0.0;
double x2 = 1.0;
double y2 = 1.0;
Affine t = new Affine(this);
t *= NewRotation(-Rotation());
t.Transform(ref x1, ref y1);
t.Transform(ref x2, ref y2);
x = x2 - x1;
y = y2 - y1;
}
///<summary>
///</summary>
///<param name="m"></param>
///<param name="epsilon"></param>
///<returns></returns>
public bool IsEqual(Affine m, double epsilon)
{
return Basics.IsEqualEps(sx, m.sx, epsilon) &&
Basics.IsEqualEps(shy, m.shy, epsilon) &&
Basics.IsEqualEps(shx, m.shx, epsilon) &&
Basics.IsEqualEps(sy, m.sy, epsilon) &&
Basics.IsEqualEps(tx, m.tx, epsilon) &&
Basics.IsEqualEps(ty, m.ty, epsilon);
}
///<summary>
///</summary>
///<returns></returns>
public static Affine NewIdentity()
{
Affine newAffine = new Affine {sx = 1.0, shy = 0.0, shx = 0.0, sy = 1.0, tx = 0.0, ty = 0.0};
return newAffine;
}
///<summary>
///</summary>
///<param name="a"></param>
///<param name="b"></param>
///<returns></returns>
public static Affine operator *(Affine a, Affine b)
{
Affine temp = new Affine(a);
temp.Multiply(b);
return temp;
}
/// <summary>
///
/// </summary>
/// <returns>
/// A <see cref="Affine"/>
/// </returns>
public static Affine NewIdentity()
{
Affine newAffine = new Affine ();
newAffine.sx = 1.0;
newAffine.shy = 0.0;
newAffine.shx = 0.0;
newAffine.sy = 1.0;
newAffine.tx = 0.0;
newAffine.ty = 0.0;
return newAffine;
}
///<summary>
///</summary>
///<returns></returns>
public static Affine NewIdentity()
{
Affine newAffine = new Affine(1.0, 0.0, 0.0, 1.0, 0.0, 0.0);
return newAffine;
}
/// <summary>
///
/// </summary>
/// <param name="value">
/// A <see cref="Affine"/>
/// </param>
public void SetTransform(Affine value)
{
affineTransformStack.Pop ();
affineTransformStack.Push (value);
}
