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matplotlib/src/agg_py_transforms.cpp at master · rephorm/matplotlib · GitHub
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agg_py_transforms.cpp
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agg_py_transforms.cpp
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/*
-*- mode: c++; c-basic-offset: 4 -*-
*/
#
include
<
Python.h
>
#
define
NO_IMPORT_ARRAY
#
include
"
numpy/arrayobject.h
"
#
include
"
CXX/Objects.hxx
"
#
include
"
agg_trans_affine.h
"
/*
* A helper function to convert from a Numpy affine transformation matrix
* to an agg::trans_affine. If errors = false then an Identity transform is returned.
*/
agg::trans_affine
py_to_agg_transformation_matrix
(PyObject* obj,
bool
errors =
true
)
{
PyArrayObject* matrix =
NULL
;
/*
* If None either raise a TypeError or return an agg identity transform.
*/
if
(obj == Py_None)
{
if
(errors)
{
throw
Py::TypeError
(
"
Cannot convert None to an affine transform.
"
);
}
return
agg::trans_affine
();
}
/*
* Try turning the object into an affine transform matrix.
*/
try
{
matrix = (PyArrayObject*)
PyArray_FromObject
(obj, PyArray_DOUBLE,
2
,
2
);
if
(!matrix)
throw
std::exception
();
}
catch
(...)
{
Py_XDECREF
(matrix);
if
(errors)
{
throw
Py::TypeError
(
"
Unable to get an affine transform matrix from the given object.
"
);
}
return
agg::trans_affine
();
}
/*
* Try turning the matrix into an agg transform.
*/
try
{
if
(
PyArray_NDIM
(matrix) ==
2
||
PyArray_DIM
(matrix,
0
) ==
3
||
PyArray_DIM
(matrix,
1
) ==
3
)
{
size_t
stride0 =
PyArray_STRIDE
(matrix,
0
);
size_t
stride1 =
PyArray_STRIDE
(matrix,
1
);
char
* row0 =
PyArray_BYTES
(matrix);
char
* row1 = row0 + stride0;
double
a = *(
double
*)(row0);
row0 += stride1;
double
c = *(
double
*)(row0);
row0 += stride1;
double
e = *(
double
*)(row0);
double
b = *(
double
*)(row1);
row1 += stride1;
double
d = *(
double
*)(row1);
row1 += stride1;
double
f = *(
double
*)(row1);
Py_XDECREF
(matrix);
return
agg::trans_affine
(a, b, c, d, e, f);
}
throw
std::exception
();
}
catch
(...)
{
if
(errors)
{
Py_XDECREF
(matrix);
throw
Py::TypeError
(
"
Invalid affine transformation matrix.
"
);
}
}
Py_XDECREF
(matrix);
return
agg::trans_affine
();
}
bool
py_convert_bbox
(PyObject* bbox_obj,
double
& l,
double
& b,
double
& r,
double
& t)
{
PyArrayObject* bbox =
NULL
;
if
(bbox_obj == Py_None)
return
false
;
try
{
bbox = (PyArrayObject*)
PyArray_FromObject
(bbox_obj, PyArray_DOUBLE,
2
,
2
);
if
(!bbox ||
PyArray_NDIM
(bbox) !=
2
||
PyArray_DIM
(bbox,
0
) !=
2
||
PyArray_DIM
(bbox,
1
) !=
2
)
{
throw
Py::TypeError
(
"
Expected a bbox array
"
);
}
l = *(
double
*)
PyArray_GETPTR2
(bbox,
0
,
0
);
b = *(
double
*)
PyArray_GETPTR2
(bbox,
0
,
1
);
r = *(
double
*)
PyArray_GETPTR2
(bbox,
1
,
0
);
t = *(
double
*)
PyArray_GETPTR2
(bbox,
1
,
1
);
Py_XDECREF
(bbox);
bbox =
NULL
;
return
true
;
}
catch
(...)
{
Py_XDECREF
(bbox);
bbox =
NULL
;
throw
;
}
return
false
;
}
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