You can find poloto on github and crates.io. Documentation at docs.rs
A simple 2D plotting library that outputs graphs to SVG that can be styled using CSS.
Poloto graphs can be stylized using css either directly in the SVG, or from inside of html with an embedded svg. The latter allows the user to dynamically match the svg to their website's theme. The user can take full advantage of CSS, adding highlight on hover, animation, shadows, strokes, etc. Check out the github examples to see this. The latest graph outputs of the examples can be found in the assets folder.
You can see it in action in this rust book broccoli-book
Gaussian Example
use *;
// PIPE me to a file!
Output
Data Example
use ;
use *;
// PIPE me to a file!
Output
Collatz Example
use *;
// PIPE me to a file!
Output
Parametric Example
// PIPE me to a file!
use *;
Output
Trig Example
use *;
// PIPE me to a file!
Output
Escape protection
If a user tried to inject html through the title/xname/yname/tick format/ or plot names, the html escapes
will get turned into their encoded values. This protection is provided by the tagger
dependency crate.
CSS Usage Example
See the graphs in this report: broccoli_book
CSS classes
Below are the css classes that can be stylized. There are default styles settings
for these css classes in the static strings STYLE_CONFIG_LIGHT_DEFAULT
and STYLE_CONFIG_DARK_DEFAULT
.
These are the css classes added through Plotter::render
poloto_text
- all poloto textpoloto_axis_lines
- axis lines and tickspoloto_tick_labels
- x and y labels as well aswhere
labelspoloto_labels
- title, x label, ylabelpoloto_title
- titlepoloto_xname
- xlabelpoloto_yname
- ylabelpoloto_legend_text
- legend textpoloto_legend_icon
- legend iconpoloto_scatter
- scatter plots and legend iconpoloto_line
- line plots and legend iconpoloto_histo
- histogram and legend iconpoloto_linefill
- line fill and legend iconpoloto_linefillraw
- line fill raw and legend icon
These are the css classes added through poloto::SVG_HEADER
which is used by simple_theme
and simple_theme_dark
.
poloto
- default svg element
For plots:
poloto[n]fill
- If the n'th plot requires fill. (e.g. linefill or histogram)poloto[n]stroke
- If the n'th plot requires stroke. (e.g. line or scatter)
Iterating plots twice
In order to calculate the right size view to scale all the plots, poloto has to iterate over all the plot points twice. Once to find the min and max bounds, and once to scale all the points by the scale determined by the first iteration.
If you are using an iterator where each iteration is expensive, consider running the iterator just once, collecting the results in a Vec. Then pass that Vec to the plotting functions. Beware of passing the buffer directly to the plotter! If you do this, you'll use a lot of memory since the plotter will clone the whole buffer. Instead pass a reference to the buffer. See the second example below.
Can I change the styling of the plots?
Yes! You can harness the power of CSS both in the svg, or outside in html with an embeded svg. Some things you can do:
- Change the color scheme to fit your html theme.
- Highlight one plot, make it dashed, or add hover effect
- Animate things using @keyframes
The Plotter
struct documents which css classes you can modify for the graph as a whole.
Each plot function documents which css classes you can modify to change that specific plot.
Scatter plots are done using SVG paths made up of lines of zero length. This allows you to change the radius of the scatter dots by changing the stroke width.
Formatting Tick Intervals
Poloto will first print intervals in normal decimal at the precision required to capture the differences in the step size between the intervals. If the magnitude of a number is detected to be too big or small, it may switch to scientific notation, still at the required precision. It will only switch if the scientific notation version is actually less characters than the normal decimal format which is not always the case when you consider the precision that might be required to capture the step size.
Even with the above system, there are cases where the numbers all have a really big magnitude, but are all really close together (small step size). In this case, there isn't really a good way to format it. In these cases, poloto will fall back to making the number relative to the first number.