Add a code example for the readme.

Author: SiegeLordEx

.gitignore

@@ -1,6 +1,6 @@
 build
 target
 Cargo.lock
-*.png
-*.pdf
-*.gnuplot
+/*.png
+/*.pdf
+/*.gnuplot

Cargo.toml

@@ -70,5 +70,10 @@ path = "examples/lines_points_3d.rs"
 
 [[example]]
 
+name = "readme_example"
+path = "examples/readme_example.rs"
+
+[[example]]
+
 name = "time"
 path = "examples/time.rs"

Readme.md

@@ -11,9 +11,28 @@ See [here](http://siegelord.github.io/RustGnuplot/doc/gnuplot/index.html)
 
 ## Examples
 
-A somewhat involved 2D example:
+A simple example:
+
+```rust
+let mut fg = Figure::new();
+fg.axes2d()
+	.set_title("A plot", &[])
+	.set_legend(Graph(0.5), Graph(0.9), &[], &[])
+	.set_x_label("x", &[])
+	.set_y_label("y^2", &[])
+	.lines(
+		&[-3., -2., -1., 0., 1., 2., 3.],
+		&[9., 4., 1., 0., 1., 4., 9.],
+		&[Caption("Parabola")],
+	);
+fg.show();
+```
+
+![Simple example plot](doc/fg.readme_example.png)
+
+A somewhat involved 2D example (see `example1.rs` in the `examples` directory):
 
-![2D Example plot](doc/fg1.1.png)
+![Complicated example plot](doc/fg1.1.png)
 
 ## Features
 

doc/fg.readme_example.png

@@ -0,0 +1,38 @@
+// This file is released into Public Domain.
+extern crate gnuplot;
+
+use common::*;
+
+use gnuplot::*;
+use std::iter::repeat;
+
+mod common;
+
+fn example(c: Common)
+{
+	let mut fg = Figure::new();
+	c.set_term(&mut fg);
+
+	fg.axes2d()
+		.set_title("A plot", &[])
+		.set_legend(Graph(0.5), Graph(0.9), &[], &[])
+		.set_x_label("x", &[])
+		.set_y_label("y^2", &[])
+		.lines(
+			&[-3., -2., -1., 0., 1., 2., 3.],
+			&[9., 4., 1., 0., 1., 4., 9.],
+			&[Caption("Parabola")],
+		);
+
+	c.show(&mut fg, "fg.readme_example.gnuplot");
+	if !c.no_show
+	{
+		fg.set_terminal("pngcairo", "fg.readme_example.png");
+		fg.show();
+	}
+}
+
+fn main()
+{
+	Common::new().map(|c| example(c));
+}

examples/readme_example.rs

@@ -6,12 +6,12 @@ pub use self::AlignType::*;
 pub use self::ArrowheadType::*;
 pub use self::AutoOption::*;
 pub use self::BorderLocation2D::*;
-pub use self::MarginSide::*;
 pub use self::ContourStyle::*;
 pub use self::DashType::*;
 pub use self::FillRegionType::*;
 pub use self::LabelOption::*;
 pub use self::LegendOption::*;
+pub use self::MarginSide::*;
 pub use self::PaletteType::*;
 pub use self::PlotOption::*;
 pub use self::Tick::*;
@@ -302,7 +302,8 @@ pub enum BorderLocation2D
 
 /// Plot margins
 #[derive(Copy, Clone)]
-pub enum MarginSide {
+pub enum MarginSide
+{
 	MarginTop(f32),
 	MarginBottom(f32),
 	MarginLeft(f32),