Quelle AffineMatrix2D.idl Sprache: C

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module com { module sun { module star { module geometry {

/** This structure defines a 2 by 3 affine matrix.

 The matrix defined by this structure constitutes an affine mapping
 of a point in 2D to another point in 2D. The last line of a
 complete 3 by 3 matrix is omitted, since it is implicitly assumed
 to be [0,0,1].

 An affine mapping, as performed by this matrix, can be written out
 as follows, where <code>xs</code> and <code>ys</code> are the source, and
 <code>xd</code> and <code>yd</code> the corresponding result coordinates:

 <code>
 xd = m00*xs + m01*ys + m02;
 yd = m10*xs + m11*ys + m12;
 </code>

 Thus, in common matrix language, with M being the
 AffineMatrix2D and vs=[xs,ys]^T, vd=[xd,yd]^T two 2D
 vectors, the affine transformation is written as
 vd=M*vs. Concatenation of transformations amounts to
 multiplication of matrices, i.e. a translation, given by T,
 followed by a rotation, given by R, is expressed as vd=R*(T*vs) in
 the above notation. Since matrix multiplication is associative,
 this can be shortened to vd=(R*T)*vs=M'*vs. Therefore, a set of
 consecutive transformations can be accumulated into a single
 AffineMatrix2D, by multiplying the current transformation with the
 additional transformation from the left.

 Due to this transformational approach, all geometry data types are
 points in abstract integer or real coordinate spaces, without any
 physical dimensions attached to them. This physical measurement
 units are typically only added when using these data types to
 render something onto a physical output device, like a screen or a
 printer, Then, the total transformation matrix and the device
 resolution determine the actual measurement unit.

 @since OOo 2.0
*/
struct AffineMatrix2D
{
 /// The top, left matrix entry.
 double m00;

 /// The top, middle matrix entry.
 double m01;

 /// The top, right matrix entry.
 double m02;

 /// The bottom, left matrix entry.
 double m10;

 /// The bottom, middle matrix entry.
 double m11;

 /// The bottom, right matrix entry.
 double m12;
};

}; }; }; };

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

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