Evizero / UnicodePlots.jl / 388

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add heatmaps (#88)

* add heatmap

* heatmap tweaks

* improve performance and add tests

* get heatmaps working again

* fix pixel! function

* heatmap tests

* double vertical resolution of heatmaps

* add colorbar and delete old tests. no tests for colorbar yet.

* fix documentation.

* move canvas dimension calculation function out of spy into canvas, so we can use it again in heatmap. add heatmap tests.

* bug fixes and more tests

* make colormap configurable

* fix default sizing and colorbar display

* fix default axis limits to match julia matrix indices

* make sure that small heatmaps show every matrix element if they can fit on the screen. disable colorbar for small heatmaps.

* fix documentation.

* handle zero sized dimensions, also arrays with all the same value, with tests

* make xscale/yscale parameter start origin at zero if used

* fix bottom y axis label, add ability to offset axes

* update README

* add heatmap screenshot

* add another heatmap example to README

* improve second readme example

* fix typo in readme

* fix README, move spy-specific parameters into spy.jl, fix zero sized plots

* fix axis limits

* fix documentation, delete extraneous function, fix default sizing when axis limits are specified

* fix colorbar when min and max are the same

* add more colormaps, test for custom colormaps. disable colorbar when
labels == false.

* fix colorbar argument naming

* really fix labels

* handle odd numbers of rows and small plot sizes correctly

* add ability to plot RGB images as heatmaps

132 of 132 new or added lines in 8 files covered. (100.0%)

611 of 625 relevant lines covered (97.76%)

1941361.9 hits per line