"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [ ]> cairo_matrix_t 3 CAIRO Library cairo_matrix_t Generic matrix operations Synopsis cairo_matrix_t; void cairo_matrix_init (cairo_matrix_t *matrix, double xx, double yx, double xy, double yy, double x0, double y0); void cairo_matrix_init_identity (cairo_matrix_t *matrix); void cairo_matrix_init_translate (cairo_matrix_t *matrix, double tx, double ty); void cairo_matrix_init_scale (cairo_matrix_t *matrix, double sx, double sy); void cairo_matrix_init_rotate (cairo_matrix_t *matrix, double radians); void cairo_matrix_translate (cairo_matrix_t *matrix, double tx, double ty); void cairo_matrix_scale (cairo_matrix_t *matrix, double sx, double sy); void cairo_matrix_rotate (cairo_matrix_t *matrix, double radians); cairo_status_t cairo_matrix_invert (cairo_matrix_t *matrix); void cairo_matrix_multiply (cairo_matrix_t *result, const cairo_matrix_t *a, const cairo_matrix_t *b); void cairo_matrix_transform_distance (const cairo_matrix_t *matrix, double *dx, double *dy); void cairo_matrix_transform_point (const cairo_matrix_t *matrix, double *x, double *y); Description typescairo_matrix 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 (x,y) is given by: x_new = xx * x + xy * y + x0; y_new = yx * x + yy * y + y0; 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(). Details cairo_matrix_t cairo_matrix_ttypedef struct { double xx; double yx; double xy; double yy; double x0; double y0; } cairo_matrix_t; A cairo_matrix_t holds an affine transformation, such as a scale, rotation, shear, or a combination of those. The transformation of a point (x, y) is given by: x_new = xx * x + xy * y + x0; y_new = yx * x + yy * y + y0; double xx; xx component of the affine transformation double yx; yx component of the affine transformation double xy; xy component of the affine transformation double yy; yy component of the affine transformation double x0; X translation component of the affine transformation double y0; Y translation component of the affine transformation cairo_matrix_init () cairo_matrix_initvoid cairo_matrix_init (cairo_matrix_t *matrix, double xx, double yx, double xy, double yy, double x0, double y0); cairo_matrix_init_identity () cairo_matrix_init_identityvoid cairo_matrix_init_identity (cairo_matrix_t *matrix); cairo_matrix_init_translate () cairo_matrix_init_translatevoid cairo_matrix_init_translate (cairo_matrix_t *matrix, double tx, double ty); cairo_matrix_init_scale () cairo_matrix_init_scalevoid cairo_matrix_init_scale (cairo_matrix_t *matrix, double sx, double sy); cairo_matrix_init_rotate () cairo_matrix_init_rotatevoid cairo_matrix_init_rotate (cairo_matrix_t *matrix, double radians); cairo_matrix_translate () cairo_matrix_translatevoid cairo_matrix_translate (cairo_matrix_t *matrix, double tx, double ty); cairo_matrix_scale () cairo_matrix_scalevoid cairo_matrix_scale (cairo_matrix_t *matrix, double sx, double sy); cairo_matrix_rotate () cairo_matrix_rotatevoid cairo_matrix_rotate (cairo_matrix_t *matrix, double radians); cairo_matrix_invert () cairo_matrix_invertcairo_status_t cairo_matrix_invert (cairo_matrix_t *matrix); cairo_matrix_multiply () cairo_matrix_multiplyvoid cairo_matrix_multiply (cairo_matrix_t *result, const cairo_matrix_t *a, const cairo_matrix_t *b); cairo_matrix_transform_distance () cairo_matrix_transform_distancevoid cairo_matrix_transform_distance (const cairo_matrix_t *matrix, double *dx, double *dy); cairo_matrix_transform_point () cairo_matrix_transform_pointvoid cairo_matrix_transform_point (const cairo_matrix_t *matrix, double *x, double *y);
