public virtual void SetTransformStruct(NSAffineTransformStruct val)
{
_matrix = val;
_isIdentity = false;
_isFlipY = false;
if (_matrix.m11 == 1.0 && _matrix.m12 == 0.0 && _matrix.m21 == 0.0)
{
if (_matrix.m22 == 1.0)
{
_isIdentity = true;
}
else if (_matrix.m22 == -1.0)
{
_isFlipY = true;
}
}
//check();
}
private static NSAffineTransformStruct matrix_multiply(NSAffineTransformStruct MA, NSAffineTransformStruct MB)
{
NSAffineTransformStruct MC;
MC.m11 = MA.m11 * MB.m11 + MA.m12 * MB.m21;
MC.m12 = MA.m11 * MB.m12 + MA.m12 * MB.m22;
MC.m21 = MA.m21 * MB.m11 + MA.m22 * MB.m21;
MC.m22 = MA.m21 * MB.m12 + MA.m22 * MB.m22;
MC.tX = MA.tX * MB.m11 + MA.tY * MB.m21 + MB.tX;
MC.tY = MA.tX * MB.m12 + MA.tY * MB.m22 + MB.tY;
return MC;
}
public virtual void ScaleBy(double scale)
{
NSAffineTransformStruct scam = IdentityTransform;
scam.m11 = scale;
scam.m22 = scale;
_matrix = matrix_multiply(scam, _matrix);
_isIdentity = false;
_isFlipY = false;
//check();
}
public virtual void RotateByRadians(double angleRad)
{
if (angleRad != 0.0)
{
double sine;
double cosine;
NSAffineTransformStruct rotm;
sine = Math.Sin(angleRad);
cosine = Math.Cos(angleRad);
rotm.m11 = cosine;
rotm.m12 = sine;
rotm.m21 = -sine;
rotm.m22 = cosine;
rotm.tX = rotm.tY = 0;
_matrix = matrix_multiply(rotm, _matrix);
_isIdentity = false;
_isFlipY = false;
//check();
}
}
public virtual void PrependTransform(ref NSAffineTransform aTransform)
{
//valid(aTransform);
if (aTransform._isIdentity)
{
double newTX;
newTX = aTransform._matrix.tX * _matrix.m11 + aTransform._matrix.tY * _matrix.m21 + _matrix.tX;
_matrix.tY = aTransform._matrix.tX * _matrix.m12 + aTransform._matrix.tY * _matrix.m22 + _matrix.tY;
_matrix.tX = newTX;
//check();
return;
}
if (aTransform._isFlipY)
{
double newTX;
newTX = aTransform._matrix.tX * _matrix.m11 + aTransform._matrix.tY * _matrix.m21 + _matrix.tX;
_matrix.tY = aTransform._matrix.tX * _matrix.m12 + aTransform._matrix.tY * _matrix.m22 + _matrix.tY;
_matrix.tX = newTX;
_matrix.m21 = -_matrix.m21;
_matrix.m22 = -_matrix.m22;
if (_isIdentity)
{
_isFlipY = true;
_isIdentity = false;
}
else if (_isFlipY)
{
_isFlipY = false;
_isIdentity = true;
}
//check();
return;
}
if (_isIdentity)
{
_matrix.m11 = aTransform._matrix.m11;
_matrix.m12 = aTransform._matrix.m12;
_matrix.m21 = aTransform._matrix.m21;
_matrix.m22 = aTransform._matrix.m22;
_matrix.tX += aTransform._matrix.tX;
_matrix.tY += aTransform._matrix.tY;
_isIdentity = false;
_isFlipY = aTransform._isFlipY;
//check();
return;
}
if (_isFlipY)
{
_matrix.m11 = aTransform._matrix.m11;
_matrix.m12 = -aTransform._matrix.m12;
_matrix.m21 = aTransform._matrix.m21;
_matrix.m22 = -aTransform._matrix.m22;
_matrix.tX += aTransform._matrix.tX;
_matrix.tY -= aTransform._matrix.tY;
_isIdentity = false;
_isFlipY = false;
//check();
return;
}
_matrix = matrix_multiply(aTransform._matrix, _matrix);
_isIdentity = false;
_isFlipY = false;
//check();
}
public virtual id InitWithTransform(ref NSAffineTransform aTransform)
{
id self = this;
_matrix = aTransform._matrix;
_isIdentity = aTransform._isIdentity;
_isFlipY = aTransform._isFlipY;
return self;
}
public override id Init()
{
id self = this;
_matrix = IdentityTransform;
_isIdentity = true;
return self;
}
