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Commit be1b95da authored by Tiago Peixoto's avatar Tiago Peixoto
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Improve vertex text positioning in graph_draw() 

This also includes the new text_rotation, and text_offset properties.
parent 223f48af
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src/graph/draw/graph_cairo_draw.cc
View file @ be1b95da
......@@ -58,6 +58,8 @@ enum vertex_attr_t {
VERTEX_TEXT,
VERTEX_TEXT_COLOR,
VERTEX_TEXT_POSITION,
VERTEX_TEXT_ROTATION,
VERTEX_TEXT_OFFSET,
VERTEX_FONT_FAMILY,
VERTEX_FONT_SLANT,
VERTEX_FONT_WEIGHT,
......@@ -118,7 +120,7 @@ typedef pair<double, double> pos_t;
typedef tuple<double, double, double, double> color_t;
typedef tr1::unordered_map<int, boost::any> attrs_t;
typedef mpl::map37<
typedef mpl::map39<
mpl::pair<mpl::int_<VERTEX_SHAPE>, vertex_shape_t>,
mpl::pair<mpl::int_<VERTEX_COLOR>, color_t>,
mpl::pair<mpl::int_<VERTEX_FILL_COLOR>, color_t>,
......@@ -132,6 +134,8 @@ typedef mpl::map37<
mpl::pair<mpl::int_<VERTEX_TEXT>, string>,
mpl::pair<mpl::int_<VERTEX_TEXT_COLOR>, color_t>,
mpl::pair<mpl::int_<VERTEX_TEXT_POSITION>, double>,
mpl::pair<mpl::int_<VERTEX_TEXT_ROTATION>, double>,
mpl::pair<mpl::int_<VERTEX_TEXT_OFFSET>, vector<double> >,
mpl::pair<mpl::int_<VERTEX_FONT_FAMILY>, string>,
mpl::pair<mpl::int_<VERTEX_FONT_SLANT>, int32_t>,
mpl::pair<mpl::int_<VERTEX_FONT_WEIGHT>, int32_t>,
......@@ -452,9 +456,9 @@ void move_radially(pos_t& pos, const pos_t& origin, double dr)
pos.second += dr * sin(angle);
}
double get_user_dist(Cairo::Context& cr)
double get_user_dist(Cairo::Context& cr, double norm = 1.)
{
double x = 1./sqrt(2), y = 1./sqrt(2);
double x = norm / sqrt(2.), y = norm / sqrt(2.);
cr.device_to_user_distance(x, y);
return sqrt(x * x + y * y);
}
......@@ -485,7 +489,7 @@ public:
double get_size(Cairo::Context& cr)
{
double size = _attrs.template get<double>(VERTEX_SIZE);
size *= get_user_dist(cr);
size = get_user_dist(cr, size);
string text = _attrs.template get<string>(VERTEX_TEXT);
if (text != "")
......@@ -496,8 +500,7 @@ public:
cr.select_font_face(_attrs.template get<string>(VERTEX_FONT_FAMILY),
static_cast<Cairo::FontSlant>(_attrs.template get<int32_t>(VERTEX_FONT_SLANT)),
static_cast<Cairo::FontWeight>(_attrs.template get<int32_t>(VERTEX_FONT_WEIGHT)));
cr.set_font_size(_attrs.template get<double>(VERTEX_FONT_SIZE) *
get_user_dist(cr));
cr.set_font_size(get_user_dist(cr, _attrs.template get<double>(VERTEX_FONT_SIZE)));
Cairo::TextExtents extents;
cr.get_text_extents(text, extents);
double s = max(extents.width, extents.height) * 1.4;
......@@ -506,7 +509,7 @@ public:
{
s /= 0.7;
double pw = _attrs.template get<double>(VERTEX_PENWIDTH);
pw *= get_user_dist(cr);
pw = get_user_dist(cr, pw);
s += pw;
}
size = max(size, s);
......@@ -515,10 +518,11 @@ public:
return size;
}
pos_t get_anchor(const pos_t& origin, Cairo::Context& cr)
pos_t get_anchor(const pos_t& origin, Cairo::Context& cr,
bool force_border=false)
{
int anchor_type =_attrs.template get<int32_t>(VERTEX_ANCHOR);
if (anchor_type == 0)
if (anchor_type == 0 && !force_border)
return _pos;
double angle = atan2(_pos.second - origin.second,
......@@ -529,7 +533,7 @@ public:
double dr = r;
double pw = _attrs.template get<double>(VERTEX_PENWIDTH);
pw *= get_user_dist(cr);
pw = get_user_dist(cr, pw);
r += pw / 2.5;
pos_t anchor;
......@@ -585,18 +589,6 @@ public:
size = get_size(cr);
aspect = _attrs.template get<double>(VERTEX_ASPECT);
string text = _attrs.template get<string>(VERTEX_TEXT);
double text_pos = 0;
if (text != "" && !outline)
{
cr.select_font_face(_attrs.template get<string>(VERTEX_FONT_FAMILY),
static_cast<Cairo::FontSlant>(_attrs.template get<int32_t>(VERTEX_FONT_SLANT)),
static_cast<Cairo::FontWeight>(_attrs.template get<int32_t>(VERTEX_FONT_WEIGHT)));
cr.set_font_size(_attrs.template get<double>(VERTEX_FONT_SIZE) *
get_user_dist(cr));
text_pos = _attrs.template get<double>(VERTEX_TEXT_POSITION);
}
if (!outline)
cr.save();
cr.translate(_pos.first, _pos.second);
......@@ -617,7 +609,7 @@ public:
if (osrc == python::object())
{
pw =_attrs.template get<double>(VERTEX_PENWIDTH);
pw *= get_user_dist(cr);
pw = get_user_dist(cr, pw);
cr.set_line_width(pw);
color = _attrs.template get<color_t>(VERTEX_COLOR);
......@@ -734,31 +726,54 @@ public:
}
}
string text = _attrs.template get<string>(VERTEX_TEXT);
if (text != "" && !outline)
{
cr.save();
double text_pos = 0;
double text_rotation = 0;
vector<double> text_offset;
cr.select_font_face(_attrs.template get<string>(VERTEX_FONT_FAMILY),
static_cast<Cairo::FontSlant>(_attrs.template get<int32_t>(VERTEX_FONT_SLANT)),
static_cast<Cairo::FontWeight>(_attrs.template get<int32_t>(VERTEX_FONT_WEIGHT)));
cr.set_font_size(get_user_dist(cr, _attrs.template get<double>(VERTEX_FONT_SIZE)));
text_pos = _attrs.template get<double>(VERTEX_TEXT_POSITION);
text_rotation = _attrs.template get<double>(VERTEX_TEXT_ROTATION);
text_offset = _attrs.template get<vector<double> >(VERTEX_TEXT_OFFSET);
text_offset.resize(2, 0.0);
cr.rotate(text_rotation);
Cairo::TextExtents extents;
cr.get_text_extents(text, extents);
Cairo::FontExtents fextents;
cr.get_font_extents(fextents);
if (text_pos < 0)
{
cr.translate(-extents.width/2 - extents.x_bearing,
extents.height / 2);
cr.translate(-extents.width / 2 - extents.x_bearing + text_offset[0],
extents.height / 2 + text_offset[1]);
}
else
{
pos_t origin;
origin.first = _pos.first + size * cos(text_pos);
origin.second = _pos.second + size * sin(text_pos);
pos_t anchor = get_anchor(origin, cr);
pos_t anchor = get_anchor(origin, cr, true);
double angle = atan2(_pos.second - anchor.second,
_pos.first - anchor.first);
_pos.first - anchor.first) + M_PI;
anchor.first = size * 1.2 * cos(angle);
anchor.second = size * 1.2 * sin(angle);
anchor.first += text_offset[0];
anchor.second += text_offset[1] + extents.height / 2;
if (anchor.first < 0)
anchor.first -= extents.width;
if (anchor.second > 0)
anchor.second += extents.height;
cr.translate(anchor.first, anchor.second);
}
color = _attrs.template get<color_t>(VERTEX_TEXT_COLOR);
......@@ -856,7 +871,7 @@ public:
pos_t pos_end_c = pos_end, pos_begin_c = pos_begin;
double marker_size = _attrs.template get<double>(EDGE_MARKER_SIZE);
marker_size *= get_user_dist(cr);
marker_size = get_user_dist(cr, marker_size);
if (start_marker == MARKER_SHAPE_NONE && !sloppy)
pos_begin = _s.get_pos();
......@@ -870,7 +885,7 @@ public:
color_t color = _attrs.template get<color_t>(EDGE_COLOR);
double pw;
pw = _attrs.template get<double>(EDGE_PENWIDTH);
pw *= get_user_dist(cr);
pw = get_user_dist(cr, pw);
cr.set_line_width(pw);
double a = get<3>(color);
......@@ -924,10 +939,9 @@ public:
cr.select_font_face(_attrs.template get<string>(EDGE_FONT_FAMILY),
static_cast<Cairo::FontSlant>(_attrs.template get<int32_t>(EDGE_FONT_SLANT)),
static_cast<Cairo::FontWeight>(_attrs.template get<int32_t>(EDGE_FONT_WEIGHT)));
cr.set_font_size(_attrs.template get<double>(EDGE_FONT_SIZE) *
get_user_dist(cr));
cr.set_font_size(get_user_dist(cr, _attrs.template get<double>(EDGE_FONT_SIZE)));
double text_dist = _attrs.template get<double>(EDGE_TEXT_DISTANCE);
text_dist *= get_user_dist(cr);
text_dist = get_user_dist(cr, text_dist);
bool text_parallel = _attrs.template get<uint8_t>(EDGE_TEXT_PARALLEL);
......@@ -1638,6 +1652,8 @@ BOOST_PYTHON_MODULE(libgraph_tool_draw)
.value("text", VERTEX_TEXT)
.value("text_color", VERTEX_TEXT_COLOR)
.value("text_position", VERTEX_TEXT_POSITION)
.value("text_rotation", VERTEX_TEXT_ROTATION)
.value("text_offset", VERTEX_TEXT_OFFSET)
.value("font_family", VERTEX_FONT_FAMILY)
.value("font_slant", VERTEX_FONT_SLANT)
.value("font_weight", VERTEX_FONT_WEIGHT)
......
src/graph_tool/draw/cairo_draw.py
View file @ be1b95da
......@@ -84,6 +84,8 @@ _vdefaults = {
"text": "",
"text_color": [0., 0., 0., 1.],
"text_position": -1.,
"text_rotation": 0.,
"text_offset": [0., 0.],
"font_family": "serif",
"font_slant": cairo.FONT_SLANT_NORMAL,
"font_weight": cairo.FONT_WEIGHT_NORMAL,
......@@ -381,8 +383,10 @@ def cairo_draw(g, pos, cr, vprops=None, eprops=None, vorder=None, eorder=None,
parallel_distance : float (optional, default: ``None``)
Distance used between parallel edges. If not provided, it will be
determined automatically.
fit_view : bool (optional, default: ``True``)
fit_view : bool or float (optional, default: ``True``)
If ``True``, the layout will be scaled to fit the entire clip region.
If a float value is given, it will be interpreted as ``True``, and in
addition the viewport will be scaled out by that factor.
vertex_* : :class:`~graph_tool.PropertyMap` or arbitrary types (optional, default: ``None``)
Parameters following the pattern ``vertex_<prop-name>`` specify the
vertex property with name ``<prop-name>``, as an alternative to the
......@@ -405,7 +409,7 @@ def cairo_draw(g, pos, cr, vprops=None, eprops=None, vorder=None, eorder=None,
warnings.warn("Unknown parameter: " + k, UserWarning)
cr.save()
if fit_view:
if fit_view != False:
extents = cr.clip_extents()
output_size = (extents[2] - extents[0], extents[3] - extents[1])
offset, zoom = fit_to_view(g, pos, output_size,
......@@ -418,6 +422,8 @@ def cairo_draw(g, pos, cr, vprops=None, eprops=None, vorder=None, eorder=None,
_vdefaults["font_size"]),
cr)
cr.translate(offset[0], offset[1])
if not isinstance(fit_view, bool):
zoom /= fit_view
cr.scale(zoom, zoom)
if "control_points" not in eprops:
......@@ -609,6 +615,12 @@ def graph_draw(g, pos=None, vprops=None, eprops=None, vorder=None, eorder=None,
| | ``-1``, the vertex size will be automatically | | |
| | increased to accommodate the text. | | |
+---------------+---------------------------------------------------+------------------------+----------------------------------+
| text_offset | Text position offset. | list of ``float`` | ``[0.0, 0.0]`` |
+---------------+---------------------------------------------------+------------------------+----------------------------------+
| text_rotation | Angle of rotation (in radians) for the text. | ``float`` | ``0.0`` |
| | The center of rotation is the position of the | | |
| | vertex. | | |
+---------------+---------------------------------------------------+------------------------+----------------------------------+
| font_family | Font family used to draw the text. | ``str`` | ``"serif"`` |
+---------------+---------------------------------------------------+------------------------+----------------------------------+
| font_slant | Font slant used to draw the text. | ``cairo.FONT_SLANT_*`` | :data:`cairo.FONT_SLANT_NORMAL` |
......
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