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Tighten whitespace around and inside plot figures - #1423
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SimonHeybrock
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In grids with many columns, the fixed gaps around each figure take a visible share of every cell. With the toolbar hidden, two 10 px gaps sat side by side on the right of each plot: the colorbar padding (or HoloViews' 10 px border) and Panel's (5, 10) pane margin. - No pane margin around the plot pane in any layout (compact figures already had none; layout-mode figures never got one). - Figure border 4 px instead of HoloViews' 10, set through the sizing opts every plotter applies, so it reaches layout sub-figures too. The frame-aspect letterbox uses the same value as its "unpadded" base. - Bokeh theme on the design: axis label standoff 2 (Material: 10), tick label standoff 3 (Bokeh: 5), colorbar padding 4 (Bokeh: 10). The compact (phone) hook already used these values; it now only keeps the inner toolbar and the smaller axis-name font. Median plot area in a 4x5 grid at 1920x1080 grows by 57% for images and 33% for line plots with toolbars hidden, and by 58% and 31% with toolbars shown. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Material's theme puts 8 px between legend rows on top of Bokeh's 20 px glyph height, plus 10 px padding inside the box and 10 px margin to the frame. Rows go from about 28 px to about 18 px and a two-entry legend from about 65 px to about 37 px tall, which matters in small grid cells where the legend covers the data. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Bokeh grows a figure's top border just enough to hold a y tick label centred on the frame's top edge, so with no pane margin that label touched the titlebar. A larger figure border would not help: the label's overhang (about 10 px) already exceeds it. A 4 px top margin on the plot pane restores the gap. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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For users
Plots take up more of each grid cell. There is less blank space around each plot, between axis names and tick labels, around colorbars, and in legends. This matters most in grids with many columns. In a 4×5 grid on a 1920×1080 screen, the median plot area grows by about 55% for images and about 30% for line plots. Legends are about 40% shorter.
Before / after
Plots in a grid with many cells:
Legend before (note the last entries in legend are cut off):
Legend after:
Notes for review
The axis, colorbar and legend spacing is set in the Bokeh theme of
LivedataDesignrather than in per-figure hooks. A theme also reaches the sub-figures of layout-mode plots, and it costs nothing per update.Test plan
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