Add dependency-free text renderers (text-utf/ascii/ansi/html) for go.Figure - #5670
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Add dependency-free text renderers (text-utf/ascii/ansi/html) for go.Figure#5670T4rk1n wants to merge 1 commit into
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…/html) Add four pure-Python, dependency-free plotly.io renderers that draw an existing go.Figure as plain text: - text-utf — braille/block-char (default) - text-ascii — 7-bit ASCII fallback - text-ansi — 24-bit truecolor ANSI escapes - text-html — self-contained class-based HTML fragment Usable via fig.show(renderer="text-utf") (etc.). Supports scatter/scattergl (lines & markers), bar (honouring orientation, with grouped fan-out), histogram, and heatmap/histogram2d (colorscale-sampled density shading). Per-series colour is taken from each trace's marker/line colour or the default qualitative palette. Unsupported traces and undersized canvases degrade to a one-line note instead of raising. Adds unit tests and a CHANGELOG entry.
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Link to issue
No tracking issue yet — happy to open a feature issue if preferred.
Description of change
Adds four pure-Python, dependency-free
plotly.iorenderers that draw an existinggo.Figureas plain text:text-utf(braille/block-char, default) andtext-ascii(7-bit fallback), plus colour variantstext-ansi(24-bit truecolor ANSI) andtext-html(self-contained class-based HTML). Use viafig.show(renderer="text-utf").Demo
Testing strategy
Adds unit tests under
plotly/io/_text/tests/covering the drawing canvas and per-mode serializers, the per-trace adapters and renderer registration, and the colour + heatmap paths (golden-output comparisons; numpy-accelerated branches exercised). All 103 tests pass locally.Additional information
Design is "one grid, many serializers": a Plotly-agnostic cell-grid canvas, per-mode serializers (one per
text-*output), and per-trace adapters that turn ago.Figureinto canvas calls. Supported traces: scatter/scattergl (lines & markers), bar (honouringorientation, with grouped fan-out), histogram, and heatmap/histogram2d (density shaded via a colorscale-sampled ramp). Per-series colour is normalized from#hex/rgb()/rgba()/ CSS name, falling back to the default qualitative palette. Unsupported traces and undersized canvases degrade to a one-line note rather than raising. Output is written as forced UTF-8.Guidelines