Matplotlib Color Tables

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import matplotlib.pyplot as pl,matplotlib.colors as mcols

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def plot_colortable(colors,title,sort_colors=True,emptycols=0,dpi=72):

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    cell_width,cell_height=212,22

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    swatch_width=48

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    margin,topmargin=12,40

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    if sort_colors is True:

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        by_hsv=sorted(

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            (tuple(mcols.rgb_to_hsv(mcols.to_rgb(color))),name)

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            for name,color in colors.items())

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        names=[name for hsv,name in by_hsv]

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    else:

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        names=list(colors)

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    n=len(names)

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    ncols=4-emptycols; nrows=n//ncols+int(n%ncols>0)

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    width=cell_width*4+2*margin

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    height=cell_height*nrows+margin+topmargin

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    fig,ax=pl.subplots(figsize=(width/dpi,height/dpi),dpi=dpi)

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    fig.subplots_adjust(margin/width,margin/height,

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                        (width-margin)/width,

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                        (height-topmargin)/height)

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    ax.set_xlim(0,cell_width*4)

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    ax.set_ylim(cell_height*(nrows-.5),-cell_height/2.)

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    ax.yaxis.set_visible(False); ax.xaxis.set_visible(False)

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    ax.set_axis_off()

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    ax.set_title(title,fontsize=20,loc='left',pad=10)

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    for i,name in enumerate(names):

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        row=i%nrows; col=i//nrows

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        y=row*cell_height

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        swatch_start_x=cell_width*col

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        swatch_end_x=cell_width*col+swatch_width

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        text_pos_x=cell_width*col+swatch_width+7

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        ax.text(text_pos_x,y,name,fontsize=10,

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                horizontalalignment='left',

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                verticalalignment='center') 

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        ax.hlines(y,swatch_start_x,swatch_end_x,

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                  color=colors[name],linewidth=18)

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    return fig

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col_fig=plot_colortable(mcols.CSS4_COLORS,'CSS Colors')

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col_fig.savefig('css4_colors.png')

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pl.show()

Language: Sage Gap GP HTML Macaulay2 Maxima Octave Python R Singular

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