cairo-matrix.sgml

按照官方的说法：Cairo is a vector graphics library with cross-device output support. 翻译过来

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cairo_matrix_t

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Generic matrix operations

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  <para><indexterm><primary>types</primary><secondary>cairo_matrix</secondary></indexterm><indexterm><primary/></indexterm>
    #cairo_matrix_t is used throughout cairo to convert between different
    coordinate spaces.  A #cairo_matrix_t holds an affine transformation,
    such as a scale, rotation, shear, or a combination of these.
    The transformation of a point (<literal>x</literal>,<literal>y</literal>)
    is given by:
  </para>
  <programlisting>
    x_new = xx * x + xy * y + x0;
    y_new = yx * x + yy * y + y0;
  </programlisting>
  <para>
    The current transformation matrix of a #cairo_t, represented as a
    #cairo_matrix_t, defines the transformation from user-space
    coordinates to device-space coordinates. See cairo_get_matrix() and
    cairo_set_matrix().
  </para>

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<para>

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@xx: 
@yx: 
@xy: 
@yy: 
@x0: 
@y0: