cas-graph 0.2.0

A customizable graphing calculator for CalcScript
Documentation 
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A customizable graphing calculator for CalcScript.

# Usage

Creating a graph is as simple as creating a [`Graph`] object, adding expressions
and points with [`Graph::add_expr`] / [`Graph::try_add_expr`] and
[`Graph::add_point`], and finally calling [`Graph::draw`]. The result can be
written to a file in PNG and SVG format.

See the [module-level documentation](graph) for more information.

# Example

Graph the expressions `x = erf(y)` and `y = erf(x)` with the viewport centered
on the points `(0, 8.1)`, `(1.2, 6.2)`, `(2.3, 4.3)`, `(3.4, 2.4)`, and `(4.5,
0.5)`, then write the result to `erf-output.png`:

```rust,no_run
use cas_graph::Graph;
use std::fs::File;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let surface = Graph::default()
        .try_add_expr("erf(y)").unwrap()
        .try_add_expr("erf(x)").unwrap()
        .add_point((0.0, 8.1))
        .add_point((1.2, 6.2))
        .add_point((2.3, 4.3))
        .add_point((3.4, 2.4))
        .add_point((4.5, 0.5))
        .center_on_points()
        .draw()?;

    let mut file = File::create("erf-output.png")?;
    surface.write_to_png(&mut file)?;

    Ok(())
}
```

Output (note: colors were randomly chosen; random color selection is not
included in the example code):

<img src="https://raw.githubusercontent.com/ElectrifyPro/cas-rs/main/cas-graph/img/erf-output.png" width="500" height="500"/>