Add colorbars to plots of gallery and tutorial examples (#2190)

* Add code for colorbar in 'contour_map.py'
* Add text for colorbar in 'contour_map.py'
* Add code for colorbar in 'grdview_surface.py'
* Add comments for colorbar in 'grdview_surface.py'
* Add gridlines in 'grdview_surface.py'

Co-authored-by: actions-bot <[email protected]>
Co-authored-by: Will Schlitzer <[email protected]>
Co-authored-by: Dongdong Tian <[email protected]>
Co-authored-by: Michael Grund <[email protected]>

Author: 5 people

examples/gallery/3d_plots/grdview_surface.py

@@ -39,10 +39,12 @@ def ackley(x, y):
 fig = pygmt.Figure()
 
 # Plot grid as a 3-D surface
-SCALE = 0.5  # in centimeter
+SCALE = 0.5  # in centimeters
 fig.grdview(
     data,
-    frame=["a5f1", "za5f1"],
+    # Set annotations and gridlines in steps of five, and
+    # tick marks in steps of one
+    frame=["a5f1g5", "za5f1g5"],
     projection=f"x{SCALE}c",
     zscale=f"{SCALE}c",
     surftype="s",
@@ -51,4 +53,10 @@ def ackley(x, y):
     shading="+a45",
 )
 
+# Add colorbar for gridded data
+fig.colorbar(
+    frame="a2f1",  # Set annotations in steps of two, tick marks in steps of one
+    position="JRM",  # Place colorbar at position Right Middle
+)
+
 fig.show()

examples/tutorials/advanced/contour_map.py

@@ -87,7 +87,8 @@
 # :meth:`pygmt.Figure.grdcontour` to keep the contour lines visible on the
 # final map. If the ``projection`` parameter is specified in the
 # :meth:`pygmt.Figure.grdimage` method, it does not need to be repeated in the
-# :meth:`pygmt.Figure.grdcontour` method.
+# :meth:`pygmt.Figure.grdcontour` method. Finally, a colorbar is added using
+# the :meth:`pygmt.Figure.colorbar` method.
 
 fig = pygmt.Figure()
 fig.grdimage(
@@ -102,4 +103,5 @@
     grid=grid,
     limit=[-4000, -2000],
 )
+fig.colorbar(frame=["x+lelevation", "y+lm"])
 fig.show()