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DOC: work on color documentation
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‎doc/users/colors.rst‎

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@@ -7,28 +7,70 @@ Specifying Colors
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In almost all places in matplotlib where a color can be specified by the user
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it can be provided as:
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* ``(r, g, b)`` tuples
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* ``(r, g, b, a)`` tuples
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* hex string, ex ``#0F0F0F``, or ``#0F0F0F0F`` (with alpha channel)
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* float value between [0, 1] for gray level
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* One of ``{'b', 'g', 'r', 'c', 'm', 'y', 'k', 'w'}``
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* valid CSS4/X11 color names
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* valid name from the `xkcd color survey
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<http://blog.xkcd.com/2010/05/03/color-survey-results/>`__ These
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names are prefixed with ``'xkcd:'`` (e.g., ``'xkcd:sky blue'``) to
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prevent name clashes with the CSS4/X11 names.
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* One of ``{'C0', 'C1', 'C2', 'C3', 'C4', 'C5', 'C6', 'C7', 'C8', 'C9'}`` which will use the
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color from the Nth element in ``mpl.rcparams['axes.prop_cycle']``.
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* a ``(r, g, b)`` tuple
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* a ``(r, g, b, a)`` tuple
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* a hex string RGB or RGBA string (ex ``'#0F0F0F'`` or ``'#0F0F0F0F'``)
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* a float value in ``[0, 1]`` inclusive for gray level
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* one of ``{'b', 'g', 'r', 'c', 'm', 'y', 'k', 'w'}``
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* a X11/CSS4 color name
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* a name from the `xkcd color survey <http://xkcd.com/color/rgb/>`__
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prefixed with ``'xkcd:'`` (e.g., ``'xkcd:sky blue'``)
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* one of ``{'C0', 'C1', 'C2', 'C3', 'C4', 'C5', 'C6', 'C7', 'C8', 'C9'}``
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All string specifications of color are case-insensitive.
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Internally, mpl is moving to storing all colors as RGBA float quadruples.
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There are 95 (out of 148 colors in the css color list) conflicts between the
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CSS4/X11 names and the xkcd names. Given that the former are the standard
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color names of the web, matplotlib should follow them. Thus, xkcd color names
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are prefixed with ``'xkcd:'``, for example ``'blue'`` maps to ``'#0000FF'``
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where as ``'xkcd:blue'`` maps to ``'#0343DF'``.
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``'CN'`` color selection
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------------------------
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Color can be specified by a string matching the regex ``C[0-9]``.
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This can be passed any place that a color is currently accepted and
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can be used as a 'single character color' in format-string to
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`matplotlib.Axes.plot`.
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This allows easy access to the color is the propriety cycle and to write code
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that will integrate with global changes to the style. For example
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.. plot::
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:include-source: True
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import matplotlib as mpl
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th = np.linspace(0, 2*np.pi, 128)
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def demo(sty):
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mpl.style.use(sty)
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fig, ax = plt.subplots(figsize=(3, 3))
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ax.set_title('style: {!r}'.format(sty), color='C0')
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ax.plot(th, np.cos(th), 'C1', label='C1')
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ax.plot(th, np.sin(th), 'C2', label='C2')
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ax.legend()
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demo('default')
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demo('seaborn')
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will plot using the color of the first and sixth styles in
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``mpl.rcParams['axes.prop_cycle']``.
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xkcd v X11/CSS4
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---------------
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The xkcd colors are derived from a user survey conducted by the
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webcomic xkcd. `Details of the survey are available on the xkcd blog
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<http://blog.xkcd.com/2010/05/03/color-survey-results/>`__.
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There are 95 (out of 148 colors in the css color list) name collisions
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between the X11/CSS4 names and the xkcd names, all but 3 of which have
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different hex values. For example ``'blue'`` maps to ``'#0000FF'``
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where as ``'xkcd:blue'`` maps to ``'#0343DF'``. Due to these name
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collisions all of the xkcd colors have ``'xkcd:'`` prefixed. As noted in
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the blog post, while it might be interesting to re-define the X11/CSS4 names
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based on such a survey we do not do so unilaterally.
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The name collisions are shown in the table below, the color names
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where the hex values agree are shown in bold.
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.. plot::
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ax = fig.add_axes([0, 0, 1, 1])
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for j, n in enumerate(sorted(overlap, reverse=True)):
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weight = None
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cn = mcd.CSS4_COLORS[n]
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xkcd = mcd.XKCD_COLORS["xkcd:" + n].upper()
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if cn != xkcd:
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print(n, cn, xkcd)
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if cn == xkcd:
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weight = 'bold'
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r1 = mpatch.Rectangle((0, j), 1, 1, color=cn)
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r2 = mpatch.Rectangle((1, j), 1, 1, color=xkcd)
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txt = ax.text(2, j+.5, ' ' + n, va='center', fontsize=10)
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txt = ax.text(2, j+.5, ' ' + n, va='center', fontsize=10,
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weight=weight)
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ax.add_patch(r1)
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ax.add_patch(r2)
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ax.axhline(j, color='k')
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ax.text(.5, j + .1, 'X11', ha='center')
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ax.text(1.5, j + .1, 'XKCD', ha='center')
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ax.text(.5, j + 1.5, 'X11', ha='center', va='center')
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ax.text(1.5, j + 1.5, 'xkcd', ha='center', va='center')
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ax.set_xlim(0, 3)
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ax.set_ylim(0, j + 1)
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ax.set_ylim(0, j + 2)
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ax.axis('off')

doc/users/whats_new/style_changes.rst renamed to doc/users/dflt_style_changes.rst

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Changes to the default style
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----------------------------
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==============================
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Changes to the default style
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==============================
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The most important changes in matplotlib 2.0 are the changes to the
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default style.
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While it is impossible to select the best default for all cases, these
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are designed to work well in the most common cases.
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These changes include:
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Colors
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``````
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colors, color cycles, and color maps
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====================================
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Colors in default property cycle
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--------------------------------
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The colors in the default proprety cycle have been changed from
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``['b', 'g', 'r', 'c', 'm', 'y', 'k']`` to the `Vega
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category10 palette
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<https://github.com/vega/vega/wiki/Scales#scale-range-literals>`__
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.. plot::
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th = np.linspace(0, 2*np.pi, 512)
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fig, (ax1, ax2) = plt.subplots(1, 2, figsize=(6, 3))
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def color_demo(ax, colors, title):
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ax.set_title(title)
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for j, c in enumerate(colors):
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v_offset = -(j / len(colors))
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ax.plot(th, .1*np.sin(th) + v_offset, color=c)
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ax.annotate("'C{}'".format(j), (0, v_offset),
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xytext=(-1.5, 0),
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ha='right',
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va='center',
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color=c,
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textcoords='offset points',
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family='monospace')
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ax.annotate("{!r}".format(c), (2*np.pi, v_offset),
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xytext=(1.5, 0),
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ha='left',
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va='center',
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color=c,
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textcoords='offset points',
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family='monospace')
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ax.axis('off')
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old_colors = ['b', 'g', 'r', 'c', 'm', 'y', 'k']
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new_colors = ['#1f77b4', '#ff7f0e', '#2ca02c', '#d62728',
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'#9467bd', '#8c564b', '#e377c2', '#7f7f7f',
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'#bcbd22', '#17becf']
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color_demo(ax1, old_colors, 'classic')
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color_demo(ax2, new_colors, 'v2.0')
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fig.subplots_adjust(**{'bottom': 0.0, 'left': 0.059, 'right': 0.869, 'top': 0.895})
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In addition to changing the colors, an additional method to specify
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colors was added. Previously, the default colors were the single
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character short-hand notations for red, green, blue, cyan, magenta,
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yellow, and black. This made them easy to type and usable in the
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abbreviated style string in ``plot``. On the other hand, the new
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colors are only specified via a hex value. To make in easy to access
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these colors the notation for colors ``'CN'`` was added to access
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colors. This allows the first 10 colors in
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``mpl.rcParms['axes.prop_cycle']`` to be easily accessed. See
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:ref:`colors` for more details.
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Other
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-----
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- The default figure background color has changed from grey to white.
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Use the rcParam ``figure.facecolor`` to control this.
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- The default cycle of colors to draw lines, markers and other content
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has been changed. It is based on the `Vega category10 palette
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<https://github.com/vega/vega/wiki/Scales#scale-range-literals>`__.
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has been changed.
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- The default color map used for images and pcolor meshes, etc., has
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changed from ``jet`` to ``viridis``.
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default.
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Plots
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`````
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=====
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- The default size of the elements in a scatter plot is now based on
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the rcParam ``lines.markersize`` so it is consistent with ``plot(X,
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Y, 'o')``. The old value was 20, and the new value is 36 (6^2).
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Hatching
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````````
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========
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- The width of the lines in a hatch pattern is now configurable by the
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rcParam `hatch.linewidth`, with a default of 1 point. The old
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- Agg: 1 px
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Plot layout
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```````````
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===========
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- The default dpi used for on-screen is now 100, which is the same as
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the old default for saving files. Due to this, the on-screen
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rcParam ``errorbar.capsize`` to control this.
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Images
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``````
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======
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- The default mode for image interpolation, in the rcParam
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``image.interpolation``, is now ``nearest``.
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downsampling of an image.
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Fonts
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`````
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=====
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- The default font has changed from "Bitstream Vera Sans" to "DejaVu
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Sans". "DejaVu Sans" is an improvement on "Bistream Vera Sans" that
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TeX backend is used (i.e. ``text.usetex`` is ``True``).
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Dates
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`````
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=====
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- The default date formats are now all based on ISO format, i.e., with
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the slowest-moving value first. The date formatters are still
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format dates based on the current locale.
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Legends
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```````
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=======
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- By default, the number of points displayed in a legend is now 1.
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- The legend now has rounded corners by default.
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mplot3d
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```````
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=======
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- mplot3d now obeys some style-related rcParams, rather than using
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hard-coded defaults. These include:

‎doc/users/whats_new.rst‎

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.. _whats-new:
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************************
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What's new in matplotlib
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************************
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==========================
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What's new in matplotlib
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==========================
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For a list of all of the issues and pull requests since the last
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revision, see the :ref:`github-stats`.
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.. note::
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matplotlib 2.0 supports Python 2.7, and 3.4+
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.. contents:: Table of Contents
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:depth: 3
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matplotlib 1.5 supports Python 2.7, 3.4, and 3.5
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matplotlib 1.4 supports Python 2.6, 2.7, 3.3, and 3.4
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matplotlib 1.3 supports Python 2.6, 2.7, 3.2, and 3.3
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New in matplotlib 2.0
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=====================
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matplotlib 1.2 supports Python 2.6, 2.7, and 3.1
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.. note::
2019

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matplotlib 1.1 supports Python 2.4 to 2.7
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matplotlib 2.0 supports Python 2.7, and 3.4+
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.. contents:: Table of Contents
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:depth: 2
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Default style changes
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---------------------
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The major changes in v2.0 are related to overhauling the default styles.
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.. toctree::
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:maxdepth: 2
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New in matplotlib-2.0
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=====================
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dflt_style_changes
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Improved color conversion API and RGBA support
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Added ``svg.hashsalt`` key to rcParams
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```````````````````````````````````````
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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If ``svg.hashsalt`` is ``None`` (which it is by default), the svg
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backend uses ``uuid4`` to generate the hash salt. If it is not
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Removed the ``svg.image_noscale`` rcParam
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`````````````````````````````````````````
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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As a result of the extensive changes to image handling, the
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``svg.image_noscale`` rcParam has been removed. The same

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