cairo_matrix 3 cairo_matrix a matrix typescairo_matrix cairo_matrix_t is used throughout Cairo to represents between different coordinates spaces. A cairo_matrix holds an affine transformation, such as a scale, rotation, or shear, or a combination of those. Mathematically, the effect of an affine transformation on a point (x,y) is given by: x_new = x * a + y * c + tx; y_new = x * b + y * d + ty; The paramaters a, b, c, d, tx, ty can be retrieved with cairo_matrix_get_affine and set with cairo_matrix_get_affine.