| """ |
| ================ |
| Anchored Artists |
| ================ |
| |
| This example illustrates the use of the anchored objects without the |
| helper classes found in :mod:`mpl_toolkits.axes_grid1`. This version |
| of the figure is similar to the one found in |
| :doc:`/gallery/axes_grid1/simple_anchored_artists`, but it is |
| implemented using only the matplotlib namespace, without the help |
| of additional toolkits. |
| |
| .. redirect-from:: /gallery/userdemo/anchored_box01 |
| .. redirect-from:: /gallery/userdemo/anchored_box02 |
| .. redirect-from:: /gallery/userdemo/anchored_box03 |
| """ |
|
|
| from matplotlib import pyplot as plt |
| from matplotlib.lines import Line2D |
| from matplotlib.offsetbox import (AnchoredOffsetbox, AuxTransformBox, |
| DrawingArea, TextArea, VPacker) |
| from matplotlib.patches import Circle, Ellipse |
|
|
|
|
| def draw_text(ax): |
| """Draw a text-box anchored to the upper-left corner of the figure.""" |
| box = AnchoredOffsetbox(child=TextArea("Figure 1a"), |
| loc="upper left", frameon=True) |
| box.patch.set_boxstyle("round,pad=0.,rounding_size=0.2") |
| ax.add_artist(box) |
|
|
|
|
| def draw_circles(ax): |
| """Draw circles in axes coordinates.""" |
| area = DrawingArea(width=40, height=20) |
| area.add_artist(Circle((10, 10), 10, fc="tab:blue")) |
| area.add_artist(Circle((30, 10), 5, fc="tab:red")) |
| box = AnchoredOffsetbox( |
| child=area, loc="upper right", pad=0, frameon=False) |
| ax.add_artist(box) |
|
|
|
|
| def draw_ellipse(ax): |
| """Draw an ellipse of width=0.1, height=0.15 in data coordinates.""" |
| aux_tr_box = AuxTransformBox(ax.transData) |
| aux_tr_box.add_artist(Ellipse((0, 0), width=0.1, height=0.15)) |
| box = AnchoredOffsetbox(child=aux_tr_box, loc="lower left", frameon=True) |
| ax.add_artist(box) |
|
|
|
|
| def draw_sizebar(ax): |
| """ |
| Draw a horizontal bar with length of 0.1 in data coordinates, |
| with a fixed label center-aligned underneath. |
| """ |
| size = 0.1 |
| text = r"1$^{\prime}$" |
| sizebar = AuxTransformBox(ax.transData) |
| sizebar.add_artist(Line2D([0, size], [0, 0], color="black")) |
| text = TextArea(text) |
| packer = VPacker( |
| children=[sizebar, text], align="center", sep=5) |
| ax.add_artist(AnchoredOffsetbox( |
| child=packer, loc="lower center", frameon=False, |
| pad=0.1, borderpad=0.5)) |
|
|
|
|
| fig, ax = plt.subplots() |
| ax.set_aspect(1) |
|
|
| draw_text(ax) |
| draw_circles(ax) |
| draw_ellipse(ax) |
| draw_sizebar(ax) |
|
|
| plt.show() |
|
|
