Introducing DensityMapbox

Signed-off-by: Guillaume W. Bres <guillaume.bressaix@gmail.com>

plotly/src/common/mod.rs

@@ -201,6 +201,7 @@ pub enum PlotType {
     Ohlc,
     Sankey,
     Surface,
+    DensityMapbox,
 }
 
 #[derive(Serialize, Clone, Debug)]

plotly/src/lib.rs

@@ -33,8 +33,8 @@ pub use plot::{ImageFormat, Plot, Trace};
 pub use traces::{box_plot, contour, histogram, image, mesh3d, sankey, scatter_mapbox, surface};
 // Bring the different trace types into the top-level scope
 pub use traces::{
-    Bar, BoxPlot, Candlestick, Contour, HeatMap, Histogram, Image, Mesh3D, Ohlc, Sankey, Scatter,
-    Scatter3D, ScatterMapbox, ScatterPolar, Surface,
+    Bar, BoxPlot, Candlestick, Contour, DensityMapbox, HeatMap, Histogram, Image, MapboxCenter,
+    Mesh3D, Ohlc, Sankey, Scatter, Scatter3D, ScatterMapbox, ScatterPolar, Surface,
 };
 
 pub trait Restyle: serde::Serialize {}

plotly/src/traces/density_mapbox.rs

@@ -0,0 +1,172 @@
+//! Density mapbox scatter plot
+
+use plotly_derive::FieldSetter;
+use serde::Serialize;
+
+use crate::color::NamedColor;
+use crate::common::{
+    color::Color, Dim, Font, HoverInfo, Label, LegendGroupTitle, Line, Marker, Mode, PlotType,
+    Position, Visible,
+};
+use crate::private::{NumOrString, NumOrStringCollection};
+use crate::traces::scatter_mapbox::Fill;
+use crate::Trace;
+
+#[derive(Serialize, Clone, Debug)]
+pub struct MapboxCenter<Lat, Lon>
+where
+    Lat: Serialize + Clone,
+    Lon: Serialize + Clone,
+{
+    pub lat: Lat,
+    pub lon: Lon,
+}
+
+#[serde_with::skip_serializing_none]
+#[derive(Serialize, Clone, Debug, FieldSetter)]
+#[field_setter(box_self, kind = "trace")]
+pub struct DensityMapbox<Lat, Lon, Z>
+where
+    Lat: Serialize + Clone,
+    Lon: Serialize + Clone,
+    Z: Serialize + Clone,
+{
+    #[field_setter(default = "PlotType::DensityMapbox")]
+    r#type: PlotType,
+    /// Sets the trace name. The trace name appear as the legend item and on
+    /// hover.
+    name: Option<String>,
+    /// Determines whether or not this trace is visible. If
+    /// `Visible::LegendOnly`, the trace is not drawn, but can appear as a
+    /// legend item (provided that the legend itself is visible).
+    visible: Option<Visible>,
+
+    /// Determines whether or not an item corresponding to this trace is shown
+    /// in the legend.
+    #[serde(rename = "showlegend")]
+    show_legend: Option<bool>,
+
+    /// Sets the legend rank for this trace. Items and groups with smaller ranks
+    /// are presented on top/left side while with `"reversed"
+    /// `legend.trace_order` they are on bottom/right side. The default
+    /// legendrank is 1000, so that you can use ranks less than 1000 to
+    /// place certain items before all unranked items, and ranks greater
+    /// than 1000 to go after all unranked items.
+    #[serde(rename = "legendrank")]
+    legend_rank: Option<usize>,
+    /// Sets the legend group for this trace. Traces part of the same legend
+    /// group show/hide at the same time when toggling legend items.
+    #[serde(rename = "legendgroup")]
+    legend_group: Option<String>,
+    /// Set and style the title to appear for the legend group.
+    #[serde(rename = "legendgrouptitle")]
+    legend_group_title: Option<LegendGroupTitle>,
+
+    /// Line display properties.
+    line: Option<Line>,
+
+    lat: Option<Vec<Lat>>,
+    lon: Option<Vec<Lon>>,
+    z: Option<Vec<Z>>,
+
+    /// Sets the opacity of the trace.
+    opacity: Option<f64>,
+
+    /// Sets a reference between this trace's data coordinates and a mapbox
+    /// subplot. If "mapbox" (the default value), the data refer to
+    /// `layout.mapbox`. If "mapbox2", the data refer to `layout.mapbox2`, and
+    /// so on.
+    subplot: Option<String>,
+
+    center: Option<MapboxCenter<Lat, Lon>>,
+
+    /// Determines whether or not the color domain is computed
+    /// with respect to the input data (here in `z`) or the bounds set
+    /// in `zmin` and `zmax`. Defaults to false when `zmin` and `zmax` are
+    /// set by the user.
+    zauto: Option<bool>,
+
+    /// Sets the upper bound of the color domain. Value should have the
+    /// same units as in `z` and if set, `zmin` must be set as well.
+    zmax: Option<Z>,
+
+    zmid: Option<Z>,
+
+    zmin: Option<Z>,
+
+    zoom: Option<u8>,
+
+    radius: Option<u8>,
+    //color_continuous_scale: Option<HashMap<Z, NamedColor>>,
+    //color_continuous_midpoint: Option<ContinuousColorScale>,
+}
+
+impl<Lat, Lon, Z> DensityMapbox<Lat, Lon, Z>
+where
+    Lat: Serialize + Clone + std::default::Default, // TODO why is "+ Default" necessary?
+    Lon: Serialize + Clone + std::default::Default,
+    Z: Serialize + Clone + std::default::Default,
+{
+    pub fn new(lat: Vec<Lat>, lon: Vec<Lon>, z: Vec<Z>) -> Box<Self> {
+        Box::new(Self {
+            lat: Some(lat),
+            lon: Some(lon),
+            z: Some(z),
+            ..Default::default()
+        })
+    }
+}
+
+impl<Lat, Lon, Z> Trace for DensityMapbox<Lat, Lon, Z>
+where
+    Lat: Serialize + Clone,
+    Lon: Serialize + Clone,
+    Z: Serialize + Clone,
+{
+    fn to_json(&self) -> String {
+        serde_json::to_string(&self).unwrap()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use serde_json::{json, to_value};
+
+    use super::*;
+
+    #[test]
+    fn test_serialize_density_mapbox() {
+        let density_mapbox = DensityMapbox::new(vec![45.5017], vec![-73.5673], vec![1.0])
+            .name("name")
+            .visible(Visible::True)
+            .show_legend(true)
+            .legend_rank(1000)
+            .legend_group("legend group")
+            .center(MapboxCenter {
+                lat: 45.5017,
+                lon: -73.5673,
+            })
+            .zoom(5)
+            .radius(20)
+            .opacity(0.5);
+        let expected = json!({
+            "type": "densitymapbox",
+            "lat": [45.5017],
+            "lon": [-73.5673],
+            "z": [1.0],
+            "name": "name",
+            "visible": true,
+            "showlegend": true,
+            "legendrank": 1000,
+            "legendgroup": "legend group",
+            "opacity": 0.5,
+            "zoom": 5,
+            "radius": 20,
+            "center": {
+                "lat": 45.5017,
+                "lon": -73.5673
+            },
+        });
+        assert_eq!(to_value(density_mapbox.clone()).unwrap(), expected);
+    }
+}

plotly/src/traces/mod.rs

@@ -4,6 +4,7 @@ pub mod bar;
 pub mod box_plot;
 mod candlestick;
 pub mod contour;
+mod density_mapbox;
 mod heat_map;
 pub mod histogram;
 pub mod image;
@@ -20,6 +21,7 @@ pub use bar::Bar;
 pub use box_plot::BoxPlot;
 pub use candlestick::Candlestick;
 pub use contour::Contour;
+pub use density_mapbox::{DensityMapbox, MapboxCenter};
 pub use heat_map::HeatMap;
 pub use histogram::Histogram;
 pub use mesh3d::Mesh3D;