Python matplotlib.path() Examples

def clip_cmd(self, cliprect, clippath):
        """Set clip rectangle. Calls self.pop() and self.push()."""
        cmds = []
        # Pop graphics state until we hit the right one or the stack is empty
        while ((self._cliprect, self._clippath) != (cliprect, clippath)
                and self.parent is not None):
            cmds.extend(self.pop())
        # Unless we hit the right one, set the clip polygon
        if ((self._cliprect, self._clippath) != (cliprect, clippath) or
            self.parent is None):
            cmds.extend(self.push())
            if self._cliprect != cliprect:
                cmds.extend([cliprect, Op.rectangle, Op.clip, Op.endpath])
            if self._clippath != clippath:
                path, affine = clippath.get_transformed_path_and_affine()
                cmds.extend(
                    PdfFile.pathOperations(path, affine, simplify=False) +
                    [Op.clip, Op.endpath])
        return cmds 

def writePathCollectionTemplates(self):
        for (name, path, trans, ob, joinstyle, capstyle, padding, filled,
             stroked) in self.paths:
            pathops = self.pathOperations(path, trans, simplify=False)
            bbox = path.get_extents(trans)
            if not np.all(np.isfinite(bbox.extents)):
                extents = [0, 0, 0, 0]
            else:
                bbox = bbox.padded(padding)
                extents = list(bbox.extents)
            self.beginStream(
                ob.id, None,
                {'Type': Name('XObject'), 'Subtype': Name('Form'),
                 'BBox': extents})
            self.output(GraphicsContextPdf.joinstyles[joinstyle], Op.setlinejoin)
            self.output(GraphicsContextPdf.capstyles[capstyle], Op.setlinecap)
            self.output(*pathops)
            self.output(Op.paint_path(False, filled, stroked))
            self.endStream() 

def clip_cmd(self, cliprect, clippath):
        """Set clip rectangle. Calls self.pop() and self.push()."""
        cmds = []
        # Pop graphics state until we hit the right one or the stack is empty
        while ((self._cliprect, self._clippath) != (cliprect, clippath)
                and self.parent is not None):
            cmds.extend(self.pop())
        # Unless we hit the right one, set the clip polygon
        if ((self._cliprect, self._clippath) != (cliprect, clippath) or
            self.parent is None):
            cmds.extend(self.push())
            if self._cliprect != cliprect:
                cmds.extend([cliprect, Op.rectangle, Op.clip, Op.endpath])
            if self._clippath != clippath:
                path, affine = clippath.get_transformed_path_and_affine()
                cmds.extend(
                    PdfFile.pathOperations(path, affine, simplify=False) +
                    [Op.clip, Op.endpath])
        return cmds 

def writePathCollectionTemplates(self):
        for (name, path, trans, ob, joinstyle, capstyle, padding, filled,
             stroked) in self.paths:
            pathops = self.pathOperations(path, trans, simplify=False)
            bbox = path.get_extents(trans)
            if not np.all(np.isfinite(bbox.extents)):
                extents = [0, 0, 0, 0]
            else:
                bbox = bbox.padded(padding)
                extents = list(bbox.extents)
            self.beginStream(
                ob.id, None,
                {'Type': Name('XObject'), 'Subtype': Name('Form'),
                 'BBox': extents})
            self.output(GraphicsContextPdf.joinstyles[joinstyle], Op.setlinejoin)
            self.output(GraphicsContextPdf.capstyles[capstyle], Op.setlinecap)
            self.output(*pathops)
            self.output(Op.paint_path(False, filled, stroked))
            self.endStream() 

def _paint_path(closep, fillp, strokep):
    """Return the PDF operator to paint a path in the following way:
    closep:  close the path before painting
    fillp:   fill the path with the fill color
    strokep: stroke the outline of the path with the line color"""
    if strokep:
        if closep:
            if fillp:
                return Op.close_fill_stroke
            else:
                return Op.close_stroke
        else:
            if fillp:
                return Op.fill_stroke
            else:
                return Op.stroke
    else:
        if fillp:
            return Op.fill
        else:
            return Op.endpath 

def _paint_path(closep, fillp, strokep):
    """Return the PDF operator to paint a path in the following way:
    closep:  close the path before painting
    fillp:   fill the path with the fill color
    strokep: stroke the outline of the path with the line color"""
    if strokep:
        if closep:
            if fillp:
                return Op.close_fill_stroke
            else:
                return Op.close_stroke
        else:
            if fillp:
                return Op.fill_stroke
            else:
                return Op.stroke
    else:
        if fillp:
            return Op.fill
        else:
            return Op.endpath 

def _load_bitmap(filename):
    """
    Load a bitmap file from the backends/images subdirectory in which the
    matplotlib library is installed. The filename parameter should not
    contain any path information as this is determined automatically.

    Returns a wx.Bitmap object
    """

    basedir = os.path.join(rcParams['datapath'],'images')

    bmpFilename = os.path.normpath(os.path.join(basedir, filename))
    if not os.path.exists(bmpFilename):
        raise IOError('Could not find bitmap file "%s"; dying'%bmpFilename)

    bmp = wx.Bitmap(bmpFilename)
    return bmp 

def draw_path_collection(self, gc, master_transform, paths, all_transforms,
                             offsets, offsetTrans, facecolors, edgecolors,
                             linewidths, linestyles, antialiaseds, urls,
                             offset_position):
        if offset_position=='data':
            offset_position = True
        else:
            offset_position = False
        path_ids = []
        for path, transform in self._iter_collection_raw_paths(
            master_transform, paths, all_transforms):
            path_ids.append((path, transform))
        master_transform = master_transform.get_matrix()
        all_transforms = [t.get_matrix() for t in all_transforms]
        offsetTrans = offsetTrans.get_matrix()
        gc.draw_path_collection(master_transform, path_ids, all_transforms,
                             offsets, offsetTrans, facecolors, edgecolors,
                             linewidths, linestyles, antialiaseds,
                             offset_position) 

def _load_bitmap(filename):
    """
    Load a bitmap file from the backends/images subdirectory in which the
    matplotlib library is installed. The filename parameter should not
    contain any path information as this is determined automatically.

    Returns a wx.Bitmap object
    """

    basedir = os.path.join(rcParams['datapath'],'images')

    bmpFilename = os.path.normpath(os.path.join(basedir, filename))
    if not os.path.exists(bmpFilename):
        raise IOError('Could not find bitmap file "%s"; dying'%bmpFilename)

    bmp = wx.Bitmap(bmpFilename)
    return bmp 

def linear_spine(cls, axes, spine_type, **kwargs):
        """
        (staticmethod) Returns a linear :class:`Spine`.
        """
        # all values of 0.999 get replaced upon call to set_bounds()
        if spine_type == 'left':
            path = mpath.Path([(0.0, 0.999), (0.0, 0.999)])
        elif spine_type == 'right':
            path = mpath.Path([(1.0, 0.999), (1.0, 0.999)])
        elif spine_type == 'bottom':
            path = mpath.Path([(0.999, 0.0), (0.999, 0.0)])
        elif spine_type == 'top':
            path = mpath.Path([(0.999, 1.0), (0.999, 1.0)])
        else:
            raise ValueError('unable to make path for spine "%s"' % spine_type)
        result = cls(axes, spine_type, path, **kwargs)
        result.set_visible(rcParams['axes.spines.{0}'.format(spine_type)])

        return result 

def draw_path_collection(self, gc, master_transform, paths, all_transforms,
                             offsets, offsetTrans, facecolors, edgecolors,
                             linewidths, linestyles, antialiaseds, urls,
                             offset_position):
        if offset_position=='data':
            offset_position = True
        else:
            offset_position = False
        path_ids = []
        for path, transform in self._iter_collection_raw_paths(
            master_transform, paths, all_transforms):
            path_ids.append((path, transform))
        master_transform = master_transform.get_matrix()
        all_transforms = [t.get_matrix() for t in all_transforms]
        offsetTrans = offsetTrans.get_matrix()
        gc.draw_path_collection(master_transform, path_ids, all_transforms,
                             offsets, offsetTrans, facecolors, edgecolors,
                             linewidths, linestyles, antialiaseds,
                             offset_position) 

def linear_spine(cls, axes, spine_type, **kwargs):
        """
        (staticmethod) Returns a linear :class:`Spine`.
        """
        # all values of 13 get replaced upon call to set_bounds()
        if spine_type == 'left':
            path = mpath.Path([(0.0, 13), (0.0, 13)])
        elif spine_type == 'right':
            path = mpath.Path([(1.0, 13), (1.0, 13)])
        elif spine_type == 'bottom':
            path = mpath.Path([(13, 0.0), (13, 0.0)])
        elif spine_type == 'top':
            path = mpath.Path([(13, 1.0), (13, 1.0)])
        else:
            raise ValueError('unable to make path for spine "%s"' % spine_type)
        result = cls(axes, spine_type, path, **kwargs)
        return result 

def _load_bitmap(filename):
    """
    Load a bitmap file from the backends/images subdirectory in which the
    matplotlib library is installed. The filename parameter should not
    contain any path information as this is determined automatically.

    Returns a wx.Bitmap object
    """

    basedir = os.path.join(rcParams['datapath'], 'images')

    bmpFilename = os.path.normpath(os.path.join(basedir, filename))
    if not os.path.exists(bmpFilename):
        raise IOError('Could not find bitmap file "%s"; dying' % bmpFilename)

    bmp = wx.Bitmap(bmpFilename)
    return bmp 

def draw_path(self, gc, path, transform, rgbFace=None):
        gc.select()
        self.handle_clip_rectangle(gc)
        gfx_ctx = gc.gfx_ctx
        transform = transform + Affine2D().scale(1.0, -1.0).translate(0.0, self.height)
        wxpath = self.convert_path(gfx_ctx, path, transform)
        if rgbFace is not None:
            gfx_ctx.SetBrush(wx.Brush(gc.get_wxcolour(rgbFace)))
            gfx_ctx.DrawPath(wxpath)
        else:
            gfx_ctx.StrokePath(wxpath)
        gc.unselect() 

def close_and_paint(self):
        """
        Return the appropriate pdf operator to close the path and
        cause it to be stroked, filled, or both.
        """
        return Op.paint_path(True, self.fillp(), self.strokep()) 

def draw_path(self, gc, path, transform, rgbFace=None):
        if rgbFace is not None:
            rgbFace = tuple(rgbFace)
        linewidth = gc.get_linewidth()
        gc.draw_path(path, transform, linewidth, rgbFace) 

def convert_path(gfx_ctx, path, transform):
        wxpath = gfx_ctx.CreatePath()
        for points, code in path.iter_segments(transform):
            if code == Path.MOVETO:
                wxpath.MoveToPoint(*points)
            elif code == Path.LINETO:
                wxpath.AddLineToPoint(*points)
            elif code == Path.CURVE3:
                wxpath.AddQuadCurveToPoint(*points)
            elif code == Path.CURVE4:
                wxpath.AddCurveToPoint(*points)
            elif code == Path.CLOSEPOLY:
                wxpath.CloseSubpath()
        return wxpath 

def transform_path_non_affine(self, path):
            vertices = path.vertices
            ipath = path.interpolated(self._resolution)
            return Path(self.transform(ipath.vertices), ipath.codes) 

def draw_markers(self, gc, marker_path, marker_trans, path, trans, rgbFace=None):
        if rgbFace is not None:
            rgbFace = tuple(rgbFace)
        linewidth = gc.get_linewidth()
        gc.draw_markers(marker_path, marker_trans, path, trans, linewidth, rgbFace) 

def __init__(self, center_longitude, center_latitude, resolution):
            """
            Create a new Lambert transform.  Resolution is the number of steps
            to interpolate between each input line segment to approximate its
            path in curved Lambert space.
            """
            Transform.__init__(self)
            self._resolution = resolution
            self._center_longitude = center_longitude
            self._center_latitude = center_latitude 

def markerObject(self, path, trans, fillp, strokep, lw, joinstyle, capstyle):
        """Return name of a marker XObject representing the given path."""
        # self.markers used by markerObject, writeMarkers, close:
        # mapping from (path operations, fill?, stroke?) to
        #   [name, object reference, bounding box, linewidth]
        # This enables different draw_markers calls to share the XObject
        # if the gc is sufficiently similar: colors etc can vary, but
        # the choices of whether to fill and whether to stroke cannot.
        # We need a bounding box enclosing all of the XObject path,
        # but since line width may vary, we store the maximum of all
        # occurring line widths in self.markers.
        # close() is somewhat tightly coupled in that it expects the
        # first two components of each value in self.markers to be the
        # name and object reference.
        pathops = self.pathOperations(path, trans, simplify=False)
        key = (tuple(pathops), bool(fillp), bool(strokep), joinstyle, capstyle)
        result = self.markers.get(key)
        if result is None:
            name = Name('M%d' % len(self.markers))
            ob = self.reserveObject('marker %d' % len(self.markers))
            bbox = path.get_extents(trans)
            self.markers[key] = [name, ob, bbox, lw]
        else:
            if result[-1] < lw:
                result[-1] = lw
            name = result[0]
        return name 

def __init__(self, resolution):
            """
            Create a new Mollweide transform.  Resolution is the number of steps
            to interpolate between each input line segment to approximate its
            path in curved Mollweide space.
            """
            Transform.__init__(self)
            self._resolution = resolution 

def transform_path_non_affine(self, path):
            vertices = path.vertices
            ipath = path.interpolated(self._resolution)
            return Path(self.transform(ipath.vertices), ipath.codes) 

def __init__(self, resolution):
            """
            Create a new Hammer transform.  Resolution is the number of steps
            to interpolate between each input line segment to approximate its
            path in curved Hammer space.
            """
            Transform.__init__(self)
            self._resolution = resolution 

def transform_path_non_affine(self, path):
            vertices = path.vertices
            ipath = path.interpolated(self._resolution)
            return Path(self.transform(ipath.vertices), ipath.codes) 

def __init__(self, resolution):
            """
            Create a new Aitoff transform.  Resolution is the number of steps
            to interpolate between each input line segment to approximate its
            path in curved Aitoff space.
            """
            Transform.__init__(self)
            self._resolution = resolution 

def circular_spine(cls, axes, center, radius, **kwargs):
        """
        (staticmethod) Returns a circular :class:`Spine`.
        """
        path = mpath.Path.unit_circle()
        spine_type = 'circle'
        result = cls(axes, spine_type, path, **kwargs)
        result.set_patch_circle(center, radius)
        return result 

def arc_spine(cls, axes, spine_type, center, radius, theta1, theta2,
                  **kwargs):
        """
        (classmethod) Returns an arc :class:`Spine`.
        """
        path = mpath.Path.arc(theta1, theta2)
        result = cls(axes, spine_type, path, **kwargs)
        result.set_patch_arc(center, radius, theta1, theta2)
        return result 

def save_figure(self, *args):
        # Fetch the required filename and file type.
        filetypes, exts, filter_index = self.canvas._get_imagesave_wildcards()
        default_file = self.canvas.get_default_filename()
        dlg = wx.FileDialog(self.canvas.GetParent(),
                            "Save to file", "", default_file, filetypes,
                            wx.FD_SAVE | wx.FD_OVERWRITE_PROMPT)
        dlg.SetFilterIndex(filter_index)
        if dlg.ShowModal() == wx.ID_OK:
            dirname = dlg.GetDirectory()
            filename = dlg.GetFilename()
            DEBUG_MSG(
                'Save file dir:%s name:%s' %
                (dirname, filename), 3, self)
            format = exts[dlg.GetFilterIndex()]
            basename, ext = os.path.splitext(filename)
            if ext.startswith('.'):
                ext = ext[1:]
            if ext in ('svg', 'pdf', 'ps', 'eps', 'png') and format != ext:
                # looks like they forgot to set the image type drop
                # down, going with the extension.
                _log.warning('extension %s did not match the selected '
                             'image type %s; going with %s',
                             ext, format, ext)
                format = ext
            try:
                self.canvas.figure.savefig(
                    os.path.join(dirname, filename), format=format)
            except Exception as e:
                error_msg_wx(str(e)) 

def _set_frame_icon(frame):
    # set frame icon
    bundle = wx.IconBundle()
    for image in ('matplotlib.png', 'matplotlib_large.png'):
        image = os.path.join(matplotlib.rcParams['datapath'], 'images', image)
        if not os.path.exists(image):
            continue
        icon = wx.Icon(_load_bitmap(image))
        if not icon.IsOk():
            return
        bundle.AddIcon(icon)
    frame.SetIcons(bundle)