Python matplotlib.path.Path.LINETO Examples

def _get_bracket(self, x0, y0,
                         cos_t, sin_t, width, length,
                        ):

            # arrow from x0, y0 to x1, y1
            from matplotlib.bezier import get_normal_points
            x1, y1, x2, y2 = get_normal_points(x0, y0, cos_t, sin_t, width)

            dx, dy = length * cos_t, length * sin_t

            vertices_arrow = [(x1 + dx, y1 + dy),
                              (x1, y1),
                              (x2, y2),
                              (x2 + dx, y2 + dy)]
            codes_arrow = [Path.MOVETO,
                           Path.LINETO,
                           Path.LINETO,
                           Path.LINETO]

            return vertices_arrow, codes_arrow 

def connect_bbox(bbox1, bbox2, loc1, loc2=None):
       if isinstance(bbox1, Rectangle):
          transform = bbox1.get_transfrom()
          bbox1 = Bbox.from_bounds(0, 0, 1, 1)
          bbox1 = TransformedBbox(bbox1, transform)

       if isinstance(bbox2, Rectangle):
          transform = bbox2.get_transform()
          bbox2 = Bbox.from_bounds(0, 0, 1, 1)
          bbox2 = TransformedBbox(bbox2, transform)

       if loc2 is None:
          loc2 = loc1

       x1, y1 = BboxConnector.get_bbox_edge_pos(bbox1, loc1)
       x2, y2 = BboxConnector.get_bbox_edge_pos(bbox2, loc2)

       verts = [[x1, y1], [x2,y2]]
       #Path()

       codes = [Path.MOVETO, Path.LINETO]

       return Path(verts, codes) 

def _revert(self, path, first_action=Path.LINETO):
        """
        A path is not simply revertable by path[::-1] since the code
        specifies an action to take from the **previous** point.
        """
        reverse_path = []
        next_code = first_action
        for code, position in path[::-1]:
            reverse_path.append((next_code, position))
            next_code = code
        return reverse_path
        # This might be more efficient, but it fails because 'tuple' object
        # doesn't support item assignment:
        #path[1] = path[1][-1:0:-1]
        #path[1][0] = first_action
        #path[2] = path[2][::-1]
        #return path 

def _extend_path(self, path, mutation_size=10):
            """
            Extend the path to make a room for drawing arrow.
            """
            from matplotlib.bezier import get_cos_sin

            x0, y0 = path.vertices[-2]
            x1, y1 = path.vertices[-1]
            cost, sint = get_cos_sin(x0, y0, x1, y1)

            d = mutation_size * 1.
            x2, y2 = x1 + cost*d, y1+sint*d

            if path.codes is None:
                _path = Path(np.concatenate([path.vertices, [[x2, y2]]]))
            else:
                _path = Path(np.concatenate([path.vertices, [[x2, y2]]]),
                             np.concatenate([path.codes, [Path.LINETO]]))

            return _path 

def _draw_powerline_line(self,
                             pos_or_x, pos_or_y,
                             pos_ex_x, pos_ex_y,
                             color, line_style):
        codes = [
            Path.MOVETO,
            Path.LINETO
        ]
        verts = [
            (pos_or_x, pos_or_y),
            (pos_ex_x, pos_ex_y)
        ]
        path = Path(verts, codes)
        patch = patches.PathPatch(path,
                                  color=color,
                                  lw=self._line_color_width,
                                  ls=line_style)
        self.ax.add_patch(patch) 

def connect_bbox(bbox1, bbox2, loc1, loc2=None):
       if isinstance(bbox1, Rectangle):
          transform = bbox1.get_transfrom()
          bbox1 = Bbox.from_bounds(0, 0, 1, 1)
          bbox1 = TransformedBbox(bbox1, transform)

       if isinstance(bbox2, Rectangle):
          transform = bbox2.get_transform()
          bbox2 = Bbox.from_bounds(0, 0, 1, 1)
          bbox2 = TransformedBbox(bbox2, transform)

       if loc2 is None:
          loc2 = loc1

       x1, y1 = BboxConnector.get_bbox_edge_pos(bbox1, loc1)
       x2, y2 = BboxConnector.get_bbox_edge_pos(bbox2, loc2)

       verts = [[x1, y1], [x2,y2]]
       #Path()

       codes = [Path.MOVETO, Path.LINETO]

       return Path(verts, codes) 

def rounded_path(vertices, roundness, close=False):
    '''make rounded path from vertices.'''
    vertices = np.asarray(vertices)
    if roundness == 0:
        vertices = vertices if not close else np.concatenate([vertices, vertices[:1]],axis=0)
        return Path(vertices, codes=[Path.MOVETO]+[Path.LINETO]*(len(vertices)-1))
    if close:
        vertices = np.concatenate([vertices, vertices[:2]], axis=0)

    codes = [Path.MOVETO]
    vertices_new = [vertices[0]]
    if close:
        cur, nex = vertices[:2]
        vertices_new[0] = cur + (nex - cur)/norm(cur-nex)*roundness
    for pre, cur, nex in zip(vertices[:-2], vertices[1:-1], vertices[2:]):
        codes.extend([Path.LINETO, Path.CURVE3, Path.CURVE3])
        dv_pre = (pre - cur)/norm(cur-pre)*roundness
        dv_nex = (nex - cur)/norm(cur-nex)*roundness
        vertices_new.extend([cur+dv_pre,cur,cur+dv_nex])
    if not close:
        codes.append(Path.LINETO)
        vertices_new.append(vertices[-1])
    return Path(vertices_new, codes) 

def rounded_path(vertices, roundness):
    '''make rounded path from vertices.'''
    vertices = np.asarray(vertices)
    if roundness == 0:
        return Path(vertices)

    codes = [Path.MOVETO]
    vertices_new = [vertices[0]]
    for pre, cur, nex in zip(vertices[:-2], vertices[1:-1], vertices[2:]):
        codes.extend([Path.LINETO, Path.CURVE3, Path.CURVE3])
        dv_pre = (pre - cur)/norm(cur-pre)*roundness
        dv_nex = (nex - cur)/norm(cur-nex)*roundness
        vertices_new.extend([cur+dv_pre,cur,cur+dv_nex])
    codes.append(Path.LINETO)
    vertices_new.append(vertices[-1])
    return Path(vertices_new, codes) 

def _extend_path(self, path, mutation_size=10):
            """
            Extend the path to make a room for drawing arrow.
            """
            from matplotlib.bezier import get_cos_sin

            x0, y0 = path.vertices[-2]
            x1, y1 = path.vertices[-1]
            cost, sint = get_cos_sin(x0, y0, x1, y1)

            d = mutation_size * 1.
            x2, y2 = x1 + cost*d, y1+sint*d

            if path.codes is None:
                _path = Path(np.concatenate([path.vertices, [[x2, y2]]]))
            else:
                _path = Path(np.concatenate([path.vertices, [[x2, y2]]]),
                             np.concatenate([path.codes, [Path.LINETO]]))

            return _path 

def _append_path(ctx, path, transform, clip=None):
    for points, code in path.iter_segments(
            transform, remove_nans=True, clip=clip):
        if code == Path.MOVETO:
            ctx.move_to(*points)
        elif code == Path.CLOSEPOLY:
           ctx.close_path()
        elif code == Path.LINETO:
            ctx.line_to(*points)
        elif code == Path.CURVE3:
            cur = np.asarray(ctx.get_current_point())
            a = points[:2]
            b = points[-2:]
            ctx.curve_to(*(cur / 3 + a * 2 / 3), *(a * 2 / 3 + b / 3), *b)
        elif code == Path.CURVE4:
            ctx.curve_to(*points) 

def transmute(self, path, mutation_size, linewidth):

            x0, y0, x1, y1, x2, y2 = self.ensure_quadratic_bezier(path)

            arrow_path = [(x0, y0), (x1, y1), (x2, y2)]
            b_plus, b_minus = make_wedged_bezier2(
                                    arrow_path,
                                    self.tail_width * mutation_size / 2.,
                                    wm=self.shrink_factor)

            patch_path = [(Path.MOVETO, b_plus[0]),
                          (Path.CURVE3, b_plus[1]),
                          (Path.CURVE3, b_plus[2]),
                          (Path.LINETO, b_minus[2]),
                          (Path.CURVE3, b_minus[1]),
                          (Path.CURVE3, b_minus[0]),
                          (Path.CLOSEPOLY, b_minus[0]),
                          ]
            path = Path([p for c, p in patch_path], [c for c, p in patch_path])

            return path, True 

def _get_bracket(self, x0, y0,
                         cos_t, sin_t, width, length,
                        ):

            # arrow from x0, y0 to x1, y1
            from matplotlib.bezier import get_normal_points
            x1, y1, x2, y2 = get_normal_points(x0, y0, cos_t, sin_t, width)

            dx, dy = length * cos_t, length * sin_t

            vertices_arrow = [(x1 + dx, y1 + dy),
                              (x1, y1),
                              (x2, y2),
                              (x2 + dx, y2 + dy)]
            codes_arrow = [Path.MOVETO,
                           Path.LINETO,
                           Path.LINETO,
                           Path.LINETO]

            return vertices_arrow, codes_arrow 

def _revert(self, path, first_action=Path.LINETO):
        """
        A path is not simply revertable by path[::-1] since the code
        specifies an action to take from the **previous** point.
        """
        reverse_path = []
        next_code = first_action
        for code, position in path[::-1]:
            reverse_path.append((next_code, position))
            next_code = code
        return reverse_path
        # This might be more efficient, but it fails because 'tuple' object
        # doesn't support item assignment:
        #path[1] = path[1][-1:0:-1]
        #path[1][0] = first_action
        #path[2] = path[2][::-1]
        #return path 

def transmute(self, path, mutation_size, linewidth):

            x0, y0, x1, y1, x2, y2 = self.ensure_quadratic_bezier(path)

            arrow_path = [(x0, y0), (x1, y1), (x2, y2)]
            b_plus, b_minus = make_wedged_bezier2(
                                    arrow_path,
                                    self.tail_width * mutation_size / 2.,
                                    wm=self.shrink_factor)

            patch_path = [(Path.MOVETO, b_plus[0]),
                          (Path.CURVE3, b_plus[1]),
                          (Path.CURVE3, b_plus[2]),
                          (Path.LINETO, b_minus[2]),
                          (Path.CURVE3, b_minus[1]),
                          (Path.CURVE3, b_minus[0]),
                          (Path.CLOSEPOLY, b_minus[0]),
                          ]
            path = Path([p for c, p in patch_path], [c for c, p in patch_path])

            return path, True 

def poly2patch(self, vertices, types, closed=False, alpha=1., color=None):
        moves = {'L': Path.LINETO,
                 'C': Path.CURVE4}
        points = [v for v in vertices]
        codes = [moves[t] for t in types]
        codes[0] = Path.MOVETO

        if closed:
            points.append(points[0])
            codes.append(Path.CLOSEPOLY)

        if color is None:
            color = random_color()

        # print(codes, points)
        return mpatches.PathPatch(
            Path(points, codes),
            facecolor=color if closed else 'none',
            edgecolor=color,  # if not closed else 'none',
            lw=1 if closed else 2 * self.scale, alpha=alpha,
            antialiased=False, snap=True) 

def poly2patch(self, poly2d, closed=False, alpha=1., color=None):
        moves = {'L': Path.LINETO,
                 'C': Path.CURVE4}
        points = [p[:2] for p in poly2d]
        codes = [moves[p[2]] for p in poly2d]
        codes[0] = Path.MOVETO

        if closed:
            points.append(points[0])
            codes.append(Path.CLOSEPOLY)

        if color is None:
            color = random_color()

        # print(codes, points)
        return mpatches.PathPatch(
            Path(points, codes),
            facecolor=color if closed else 'none',
            edgecolor=color,  # if not closed else 'none',
            lw=1 if closed else 2 * self.scale, alpha=alpha,
            antialiased=False, snap=True) 

def _get_bracket(self, x0, y0,
                         cos_t, sin_t, width, length,
                        ):

            # arrow from x0, y0 to x1, y1
            from matplotlib.bezier import get_normal_points
            x1, y1, x2, y2 = get_normal_points(x0, y0, cos_t, sin_t, width)

            dx, dy = length * cos_t, length * sin_t

            vertices_arrow = [(x1 + dx, y1 + dy),
                              (x1, y1),
                              (x2, y2),
                              (x2 + dx, y2 + dy)]
            codes_arrow = [Path.MOVETO,
                           Path.LINETO,
                           Path.LINETO,
                           Path.LINETO]

            return vertices_arrow, codes_arrow 

def transmute(self, path, mutation_size, linewidth):

            x0, y0, x1, y1, x2, y2 = self.ensure_quadratic_bezier(path)

            arrow_path = [(x0, y0), (x1, y1), (x2, y2)]
            b_plus, b_minus = make_wedged_bezier2(
                                    arrow_path,
                                    self.tail_width * mutation_size / 2.,
                                    wm=self.shrink_factor)

            patch_path = [(Path.MOVETO, b_plus[0]),
                          (Path.CURVE3, b_plus[1]),
                          (Path.CURVE3, b_plus[2]),
                          (Path.LINETO, b_minus[2]),
                          (Path.CURVE3, b_minus[1]),
                          (Path.CURVE3, b_minus[0]),
                          (Path.CLOSEPOLY, b_minus[0]),
                          ]
            path = Path([p for c, p in patch_path], [c for c, p in patch_path])

            return path, True 

def test_clipping_of_log():
    # issue 804
    M,L,C = Path.MOVETO, Path.LINETO, Path.CLOSEPOLY
    points = [ (0.2, -99), (0.4, -99), (0.4, 20), (0.2, 20), (0.2, -99) ]
    codes  = [          M,          L,        L,         L,          C  ]
    path = Path(points, codes)

    # something like this happens in plotting logarithmic histograms
    trans = BlendedGenericTransform(Affine2D(),
                                    LogScale.Log10Transform('clip'))
    tpath = trans.transform_path_non_affine(path)
    result = tpath.iter_segments(trans.get_affine(),
                                 clip=(0, 0, 100, 100),
                                 simplify=False)

    tpoints, tcodes = list(zip(*result))
    # Because y coordinate -99 is outside the clip zone, the first
    # line segment is effectively removed. That means that the closepoly
    # operation must be replaced by a move to the first point.
    assert np.allclose(tcodes, [ M, M, L, L, L ]) 

def poly2patch(self, vertices, types, closed=False, alpha=1., color=None):
        moves = {'L': Path.LINETO,
                 'C': Path.CURVE4}
        points = [v for v in vertices]
        codes = [moves[t] for t in types]
        codes[0] = Path.MOVETO

        if closed:
            points.append(points[0])
            codes.append(Path.CLOSEPOLY)

        if color is None:
            color = random_color()

        # print(codes, points)
        return mpatches.PathPatch(
            Path(points, codes),
            facecolor=color if closed else 'none',
            edgecolor=color,  # if not closed else 'none',
            lw=1 if closed else 2 * self.scale, alpha=alpha,
            antialiased=False, snap=True) 

def poly2patch(self, poly2d, closed=False, alpha=1., color=None):
        moves = {'L': Path.LINETO,
                 'C': Path.CURVE4}
        points = [p[:2] for p in poly2d]
        codes = [moves[p[2]] for p in poly2d]
        codes[0] = Path.MOVETO

        if closed:
            points.append(points[0])
            if codes[-1] == 4:
                codes.append(Path.LINETO)
            else:
                codes.append(Path.CLOSEPOLY)

        if color is None:
            color = random_color()

        # print(codes, points)
        return mpatches.PathPatch(
            Path(points, codes),
            facecolor=color if closed else 'none',
            edgecolor=color,  # if not closed else 'none',
            lw=1 if closed else 2 * self.scale, alpha=alpha,
            antialiased=False, snap=True) 

def __init__(self, hatch, density):
        self.num_rows = (hatch.count('*')) * density
        path = Path.unit_regular_star(5)
        self.shape_vertices = path.vertices
        self.shape_codes = np.ones(len(self.shape_vertices)) * Path.LINETO
        self.shape_codes[0] = Path.MOVETO
        Shapes.__init__(self, hatch, density) 

def _convert_path(self, path, transform, clip=False, simplify=None):
        ps = []
        last_points = None
        if clip:
            clip = (0.0, 0.0, self.width * 72.0,
                    self.height * 72.0)
        else:
            clip = None
        for points, code in path.iter_segments(transform, clip=clip,
                                               simplify=simplify):
            if code == Path.MOVETO:
                ps.append("%g %g m" % tuple(points))
            elif code == Path.CLOSEPOLY:
                ps.append("cl")
            elif last_points is None:
                # The other operations require a previous point
                raise ValueError('Path lacks initial MOVETO')
            elif code == Path.LINETO:
                ps.append("%g %g l" % tuple(points))
            elif code == Path.CURVE3:
                points = quad2cubic(*(list(last_points[-2:]) + list(points)))
                ps.append("%g %g %g %g %g %g c" %
                          tuple(points[2:]))
            elif code == Path.CURVE4:
                ps.append("%g %g %g %g %g %g c" % tuple(points))
            last_points = points

        ps = "\n".join(ps)
        return ps 

def pathOperations(path, transform, clip=None, simplify=None, sketch=None):
        cmds = []
        last_points = None
        for points, code in path.iter_segments(transform, clip=clip,
                                               simplify=simplify,
                                               sketch=sketch):
            if code == Path.MOVETO:
                # This is allowed anywhere in the path
                cmds.extend(points)
                cmds.append(Op.moveto)
            elif code == Path.CLOSEPOLY:
                cmds.append(Op.closepath)
            elif last_points is None:
                # The other operations require a previous point
                raise ValueError('Path lacks initial MOVETO')
            elif code == Path.LINETO:
                cmds.extend(points)
                cmds.append(Op.lineto)
            elif code == Path.CURVE3:
                points = quad2cubic(*(list(last_points[-2:]) + list(points)))
                cmds.extend(points[2:])
                cmds.append(Op.curveto)
            elif code == Path.CURVE4:
                cmds.extend(points)
                cmds.append(Op.curveto)
            last_points = points
        return cmds 

def __init__(self, hatch, density):
        self.num_rows = (hatch.count('*')) * density
        path = Path.unit_regular_star(5)
        self.shape_vertices = path.vertices
        self.shape_codes = np.ones(len(self.shape_vertices)) * Path.LINETO
        self.shape_codes[0] = Path.MOVETO
        Shapes.__init__(self, hatch, density) 

def _draw_gen_line(self, pos_x, pos_y, sub_x, sub_y):
        codes = [
            Path.MOVETO,
            Path.LINETO
        ]
        verts = [
            (pos_x, pos_y),
            (sub_x, sub_y)
        ]
        path = Path(verts, codes)
        patch = patches.PathPatch(path,
                                  color=self._gen_line_color,
                                  lw=self._load_line_width)
        self.ax.add_patch(patch) 

def pathOperations(path, transform, clip=None, simplify=None, sketch=None):
        cmds = []
        last_points = None
        for points, code in path.iter_segments(transform, clip=clip,
                                               simplify=simplify,
                                               sketch=sketch):
            if code == Path.MOVETO:
                # This is allowed anywhere in the path
                cmds.extend(points)
                cmds.append(Op.moveto)
            elif code == Path.CLOSEPOLY:
                cmds.append(Op.closepath)
            elif last_points is None:
                # The other operations require a previous point
                raise ValueError('Path lacks initial MOVETO')
            elif code == Path.LINETO:
                cmds.extend(points)
                cmds.append(Op.lineto)
            elif code == Path.CURVE3:
                points = quad2cubic(*(list(last_points[-2:]) + list(points)))
                cmds.extend(points[2:])
                cmds.append(Op.curveto)
            elif code == Path.CURVE4:
                cmds.extend(points)
                cmds.append(Op.curveto)
            last_points = points
        return cmds 

def _convert_path(self, path, transform, clip=False, simplify=None):
        ps = []
        last_points = None
        if clip:
            clip = (0.0, 0.0, self.width * 72.0,
                    self.height * 72.0)
        else:
            clip = None
        for points, code in path.iter_segments(transform, clip=clip,
                                               simplify=simplify):
            if code == Path.MOVETO:
                ps.append("%g %g m" % tuple(points))
            elif code == Path.CLOSEPOLY:
                ps.append("cl")
            elif last_points is None:
                # The other operations require a previous point
                raise ValueError('Path lacks initial MOVETO')
            elif code == Path.LINETO:
                ps.append("%g %g l" % tuple(points))
            elif code == Path.CURVE3:
                points = quad2cubic(*(list(last_points[-2:]) + list(points)))
                ps.append("%g %g %g %g %g %g c" %
                          tuple(points[2:]))
            elif code == Path.CURVE4:
                ps.append("%g %g %g %g %g %g c" % tuple(points))
            last_points = points

        ps = "\n".join(ps)
        return ps 

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 _print_pgf_path(self, gc, path, transform):
        f = 1. / self.dpi
        # check for clip box
        bbox = gc.get_clip_rectangle() if gc else None
        if bbox:
            p1, p2 = bbox.get_points()
            clip = (p1[0], p1[1], p2[0], p2[1])
        else:
            clip = None
        # build path
        for points, code in path.iter_segments(transform, clip=clip):
            if code == Path.MOVETO:
                x, y = tuple(points)
                writeln(self.fh, r"\pgfpathmoveto{\pgfqpoint{%fin}{%fin}}" %
                        (f * x, f * y))
            elif code == Path.CLOSEPOLY:
                writeln(self.fh, r"\pgfpathclose")
            elif code == Path.LINETO:
                x, y = tuple(points)
                writeln(self.fh, r"\pgfpathlineto{\pgfqpoint{%fin}{%fin}}" %
                        (f * x, f * y))
            elif code == Path.CURVE3:
                cx, cy, px, py = tuple(points)
                coords = cx * f, cy * f, px * f, py * f
                writeln(self.fh, r"\pgfpathquadraticcurveto{\pgfqpoint{%fin}{%fin}}{\pgfqpoint{%fin}{%fin}}" % coords)
            elif code == Path.CURVE4:
                c1x, c1y, c2x, c2y, px, py = tuple(points)
                coords = c1x * f, c1y * f, c2x * f, c2y * f, px * f, py * f
                writeln(self.fh, r"\pgfpathcurveto{\pgfqpoint{%fin}{%fin}}{\pgfqpoint{%fin}{%fin}}{\pgfqpoint{%fin}{%fin}}" % coords)