1 files changed, 122 insertions, 0 deletions
diff --git a/vendor/plotters/src/series/line_series.rs b/vendor/plotters/src/series/line_series.rs
new file mode 100644
index 000000000..2d0cf9863
--- /dev/null
+++ b/vendor/plotters/src/series/line_series.rs
@@ -0,0 +1,122 @@
+use crate::element::{Circle, DynElement, IntoDynElement, PathElement};
+use crate::style::ShapeStyle;
+use plotters_backend::DrawingBackend;
+use std::marker::PhantomData;
+
+/**
+The line series object, which takes an iterator of data points in guest coordinate system
+and creates appropriate lines and points with the given style.
+
+# Example
+
+```
+use plotters::prelude::*;
+let x_values = [0.0f64, 1., 2., 3., 4.];
+let drawing_area = SVGBackend::new("line_series_point_size.svg", (300, 200)).into_drawing_area();
+drawing_area.fill(&WHITE).unwrap();
+let mut chart_builder = ChartBuilder::on(&drawing_area);
+chart_builder.margin(10).set_left_and_bottom_label_area_size(20);
+let mut chart_context = chart_builder.build_cartesian_2d(0.0..4.0, 0.0..3.0).unwrap();
+chart_context.configure_mesh().draw().unwrap();
+chart_context.draw_series(LineSeries::new(x_values.map(|x| (x, 0.3 * x)), BLACK)).unwrap();
+chart_context.draw_series(LineSeries::new(x_values.map(|x| (x, 2.5 - 0.05 * x * x)), RED)
+    .point_size(5)).unwrap();
+chart_context.draw_series(LineSeries::new(x_values.map(|x| (x, 2. - 0.1 * x * x)), BLUE.filled())
+    .point_size(4)).unwrap();
+```
+
+The result is a chart with three line series; two of them have their data points highlighted:
+
+![](https://cdn.jsdelivr.net/gh/facorread/plotters-doc-data@64e0a28/apidoc/line_series_point_size.svg)
+*/
+pub struct LineSeries<DB: DrawingBackend, Coord> {
+    style: ShapeStyle,
+    data: Vec<Coord>,
+    point_idx: usize,
+    point_size: u32,
+    phantom: PhantomData<DB>,
+}
+
+impl<DB: DrawingBackend, Coord: Clone + 'static> Iterator for LineSeries<DB, Coord> {
+    type Item = DynElement<'static, DB, Coord>;
+    fn next(&mut self) -> Option<Self::Item> {
+        if !self.data.is_empty() {
+            if self.point_size > 0 && self.point_idx < self.data.len() {
+                let idx = self.point_idx;
+                self.point_idx += 1;
+                return Some(
+                    Circle::new(self.data[idx].clone(), self.point_size, self.style)
+                        .into_dyn(),
+                );
+            }
+            let mut data = vec![];
+            std::mem::swap(&mut self.data, &mut data);
+            Some(PathElement::new(data, self.style).into_dyn())
+        } else {
+            None
+        }
+    }
+}
+
+impl<DB: DrawingBackend, Coord> LineSeries<DB, Coord> {
+    /**
+    Creates a new line series based on a data iterator and a given style.
+
+    See [`LineSeries`] for more information and examples.
+    */
+    pub fn new<I: IntoIterator<Item = Coord>, S: Into<ShapeStyle>>(iter: I, style: S) -> Self {
+        Self {
+            style: style.into(),
+            data: iter.into_iter().collect(),
+            point_size: 0,
+            point_idx: 0,
+            phantom: PhantomData,
+        }
+    }
+
+    /**
+    Sets the size of the points in the series, in pixels.
+
+    See [`LineSeries`] for more information and examples.
+    */
+    pub fn point_size(mut self, size: u32) -> Self {
+        self.point_size = size;
+        self
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use crate::prelude::*;
+
+    #[test]
+    fn test_line_series() {
+        let drawing_area = create_mocked_drawing_area(200, 200, |m| {
+            m.check_draw_path(|c, s, _path| {
+                assert_eq!(c, RED.to_rgba());
+                assert_eq!(s, 3);
+                // TODO when cleanup the backend coordinate defination, then we uncomment the
+                // following check
+                //for i in 0..100 {
+                //    assert_eq!(path[i], (i as i32 * 2, 199 - i as i32 * 2));
+                //}
+            });
+
+            m.drop_check(|b| {
+                assert_eq!(b.num_draw_path_call, 1);
+                assert_eq!(b.draw_count, 1);
+            });
+        });
+
+        let mut chart = ChartBuilder::on(&drawing_area)
+            .build_cartesian_2d(0..100, 0..100)
+            .expect("Build chart error");
+
+        chart
+            .draw_series(LineSeries::new(
+                (0..100).map(|x| (x, x)),
+                Into::<ShapeStyle>::into(&RED).stroke_width(3),
+            ))
+            .expect("Drawing Error");
+    }
+}