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120 lines
4.6 KiB
Markdown
120 lines
4.6 KiB
Markdown
% notcurses_plot(3)
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% nick black <nickblack@linux.com>
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% v1.4.2
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# NAME
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notcurses_plot - high level widget for plotting
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# SYNOPSIS
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**#include <notcurses/notcurses.h>**
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```c
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typedef enum {
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NCPLOT_1x1, // full block █
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NCPLOT_2x1, // full/(upper|left) blocks ▄█
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NCPLOT_1x1x4, // shaded full blocks ▓▒░█
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NCPLOT_2x2, // quadrants ▗▐ ▖▄▟▌▙█
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NCPLOT_4x1, // four vert/horz levels █▆▄▂ / ▎▌▊█
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NCPLOT_4x2, // 4x2-way braille ⡀⡄⡆⡇⢀⣀⣄⣆⣇⢠⣠⣤⣦⣧⢰⣰⣴⣶⣷⢸⣸⣼⣾⣿
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NCPLOT_8x1, // eight vert/horz levels █▇▆▅▄▃▂▁ / ▏▎▍▌▋▊▉█
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} ncgridgeom_e;
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#define NCPLOT_OPTIONS_LABELTICKSD 0x0001
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#define NCPLOT_OPTIONS_EXPONENTIALD 0x0002
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#define NCPLOT_OPTIONS_VERTICALI 0x0004
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typedef struct ncplot_options {
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// channels for the maximum and minimum levels.
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// lerp across the domain between these two.
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uint64_t maxchannel;
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uint64_t minchannel;
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// number of "pixels" per row x column
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ncgridgeom_e gridtype;
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// independent variable is a contiguous range
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int rangex;
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bool labelaxisd; // label dependent axis
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bool exponentially; // is dependent exponential?
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bool vertical_indep; // vertical independent variable
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} ncplot_options;
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```
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**struct ncuplot* ncuplot_create(struct ncplane* n, const ncplot_options* opts, uint64_t miny, uint64_t maxy);**
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**struct ncdplot* ncdplot_create(struct ncplane* n, const ncplot_options* opts, double miny, double maxy);**
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**struct ncplane* ncuplot_plane(struct ncuplot* n);**
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**struct ncplane* ncdplot_plane(struct ncdplot* n);**
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**int ncuplot_add_sample(struct ncuplot* n, uint64_t x, uint64_t y);**
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**int ncdplot_add_sample(struct ncdplot* n, uint64_t x, double y);**
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**int ncuplot_set_sample(struct ncuplot* n, uint64_t x, uint64_t y);**
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**int ncdplot_set_sample(struct ncdplot* n, uint64_t x, double y);**
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**void ncuplot_destroy(struct ncuplot* n);**
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**void ncdplot_destroy(struct ncdplot* n);**
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# DESCRIPTION
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These functions support histograms. The independent variable is always an
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**uint64_t**. The samples are either **uint64_t**s (**ncuplot**) or **double**s
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(**ncdplot**). Only a window over the samples is retained at any given time,
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and this window can only move towards larger values of the independent
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variable. The window is moved forward whenever an **x** larger than the current
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window's maximum is supplied to **add_sample** or **set_sample**.
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**add_sample** increments the current value corresponding to this **x** by
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**y**. **set_sample** replaces the current value corresponding to this **x**.
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If **rangex** is 0, or larger than the bound plane will support, it is capped
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to the available space. The domain can either be specified as **miny** and
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**maxy**, or domain autodetection can be invoked via setting both to 0. If the
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domain is specified, samples outside the domain are an error, and do not
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contribute to the plot. Supplying an **x** below the current window is an
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error, and has no effect.
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The different **ncgridgeom_e** values select from among available glyph sets:
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* **NCPLOT_1x1**: Full block (█) or empty glyph
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* **NCPLOT_2x1**: Adds the lower half block (▄) to **NCPLOT_1x1**.
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* **NCPLOT_1x1x4**: Adds three shaded full blocks (▓▒░) to **NCPLOT_1x1**.
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* **NCPLOT_2x2**: Adds left and right half blocks (▌▐) and quadrants (▖▗▟▙) to **NCPLOT_2x1**.
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* **NCPLOT_4x1**: Adds ¼ and ¾ blocks (▂▆) to **NCPLOT_2x1**.
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* **NCPLOT_4x2**: 4 rows and 2 columns of braille (⡀⡄⡆⡇⢀⣀⣄⣆⣇⢠⣠⣤⣦⣧⢰⣰⣴⣶⣷⢸⣸⣼⣾⣿).
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* **NCPLOT_8x1**: Adds ⅛, ⅜, ⅝, and ⅞ blocks (▇▅▃▁) to **NCPLOT_4x1**.
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More granular block glyphs means more resolution in your plots, but they can
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be difficult to differentiate at small text sizes. Quadrants and braille allow
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for more resolution on the independent variable. It can be difficult to predict
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how the braille glyphs will look in a given font.
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The same **ncplot_options** struct can be used with all ncplot types. The
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**flags** field is a bitmask composed of:
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* **NCPLOT_OPTIONS_LABELTICKSD**: Label dependent axis ticks.
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* **NCPLOT_OPTIONS_EXPONENTIALD**: Use an exponential dependent axis.
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* **NCPLOT_OPTIONS_VERTICALI**: Vertical independent axis.
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# NOTES
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Neither **exponentially** not **vertical_indep** is yet implemented.
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# RETURN VALUES
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**create** will return an error if **miny** equals **maxy**, but they are
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non-zero. It will also return an error if **maxy** < **miny**. An invalid
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**gridtype** will result in an error.
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**plane** returns the **ncplane** on which the plot is drawn. It cannot fail.
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# SEE ALSO
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**notcurses(3)**,
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**notcurses_plane(3)**
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