cairo-matrix.sgml

linux下面的一个矢量绘图开发软件源代码

<!-- ##### SECTION Title ##### -->

  cairo_matrix_t

<!-- ##### SECTION Short_Description ##### -->

  Generic matrix operations

<!-- ##### SECTION Long_Description ##### -->

  <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>

<!-- ##### SECTION See_Also ##### -->
<para>
    
</para>

<!-- ##### SECTION Stability_Level ##### -->


<!-- ##### STRUCT cairo_matrix_t ##### -->
<para>

</para>

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

<!-- ##### FUNCTION cairo_matrix_init ##### -->
<para>

</para>

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


<!-- ##### FUNCTION cairo_matrix_init_identity ##### -->
<para>

</para>

@matrix: 


<!-- ##### FUNCTION cairo_matrix_init_translate ##### -->
<para>

</para>

@matrix: 
@tx: 
@ty: 


<!-- ##### FUNCTION cairo_matrix_init_scale ##### -->
<para>

</para>

@matrix: 
@sx: 
@sy: 


<!-- ##### FUNCTION cairo_matrix_init_rotate ##### -->
<para>

</para>

@matrix: 
@radians: 


<!-- ##### FUNCTION cairo_matrix_translate ##### -->
<para>

</para>

@matrix: 
@tx: 
@ty: 


<!-- ##### FUNCTION cairo_matrix_scale ##### -->
<para>

</para>

@matrix: 
@sx: 
@sy: 


<!-- ##### FUNCTION cairo_matrix_rotate ##### -->
<para>

</para>

@matrix: 
@radians: 


<!-- ##### FUNCTION cairo_matrix_invert ##### -->
<para>

</para>

@matrix: 
@Returns: 


<!-- ##### FUNCTION cairo_matrix_multiply ##### -->
<para>

</para>

@result: 
@a: 
@b: 


<!-- ##### FUNCTION cairo_matrix_transform_distance ##### -->
<para>

</para>

@matrix: 
@dx: 
@dy: 


<!-- ##### FUNCTION cairo_matrix_transform_point ##### -->
<para>

</para>

@matrix: 
@x: 
@y: