diff --git a/src/draw.js b/src/draw.js
index f803d52..fa19e08 100644
--- a/src/draw.js
+++ b/src/draw.js
@@ -20,6 +20,7 @@ import { bubble } from "./layers/bubble.js";
 import { square } from "./layers/square.js";
 import { regularbubble } from "./layers/regularbubble.js";
 import { regularsquare } from "./layers/regularsquare.js";
+import { joyplot } from "./layers/joyplot.js";
 import { regulargrid } from "./layers/regulargrid.js";
 import { smooth } from "./layers/smooth.js";
 import { mushroom } from "./layers/mushroom.js";
@@ -748,6 +749,31 @@ export function draw({ params = {}, layers = {} } = {}) {
       );
     }
 
+    // joyplot
+
+    if (layer.type == "joyplot") {
+      joyplot(
+        svg,
+        projection,
+        {
+          geojson: layer.geojson,
+          values: layer.values,
+          step: layer.step,
+          blur: layer.blur,
+          k: layer.k,
+          fill: layer.fill,
+          stroke: layer.stroke,
+          strokeWidth: layer.strokeWidth,
+          fillOpacity: layer.fillOpacity,
+          strokeDasharray: layer.strokeDasharray,
+          strokeOpacity: layer.strokeOpacity,
+        },
+        clipid,
+        width,
+        height
+      );
+    }
+
     // Points Bertin (carrés)
 
     if (layer.type == "regularsquare") {
diff --git a/src/helpers/grid.js b/src/helpers/grid.js
index 1c71e98..92f4364 100644
--- a/src/helpers/grid.js
+++ b/src/helpers/grid.js
@@ -2,7 +2,7 @@ import booleanPointInPolygon from "@turf/boolean-point-in-polygon";
 //import area from "@turf/area";
 import bbox from "@turf/bbox";
 import intersect from "@turf/intersect";
-import RBush from 'rbush';
+import RBush from "rbush";
 const turf = Object.assign({}, { booleanPointInPolygon, intersect, bbox });
 
 import { range, rollup, ascending, blur2, sum, flatGroup } from "d3-array";
@@ -35,7 +35,8 @@ export function grid({
   height, // height of the map
   step = 20, // gap between points
   output = "dots", // dots or squares
-  blur = 0, // blur value with d3.blur2()
+  blur = 0, // blur value with d3.blur2(),
+  keep = false,
 } = {}) {
   // ---------------
   // Build empty grid
@@ -186,14 +187,15 @@ export function grid({
 
     // Create an RTree
     const polysRTree = new RBush();
-    polysRTree.load( //
+    polysRTree.load(
+      //
       polys.features.map((d, i) => {
         const b = getBbox(d);
         // We store the index of the feature alongside the bbox,
         // so we can retrieve the feature later.
         b.ix = i;
         return b;
-     }),
+      })
     );
 
     // Build intersected pieces
@@ -285,13 +287,20 @@ export function grid({
       });
     }
 
-    let FeatureCollection = {
-      type: "FeatureCollection",
-      features: features
-        .filter((d) => d.properties.value > 0)
-        .sort((a, b) => d3.ascending(a.properties.value, b.properties.value)),
-    };
-
-    return FeatureCollection;
+    if (keep == true) {
+      return {
+        type: "FeatureCollection",
+        features: features
+          //.filter((d) => d.properties.value > 0)
+          .sort((a, b) => d3.ascending(a.properties.value, b.properties.value)),
+      };
+    } else {
+      return {
+        type: "FeatureCollection",
+        features: features
+          .filter((d) => d.properties.value > 0)
+          .sort((a, b) => d3.ascending(a.properties.value, b.properties.value)),
+      };
+    }
   }
 }
diff --git a/src/index.js b/src/index.js
index 9ac83d2..f027519 100644
--- a/src/index.js
+++ b/src/index.js
@@ -7,3 +7,7 @@ export { links } from "./links.js";
 export { borders } from "./borders.js";
 export { bbox } from "./bbox.js";
 export { properties } from "./properties.js";
+
+// test
+
+export { grid } from "./helpers/grid.js";
diff --git a/src/layers/joyplot.js b/src/layers/joyplot.js
new file mode 100644
index 0000000..679983f
--- /dev/null
+++ b/src/layers/joyplot.js
@@ -0,0 +1,105 @@
+import { grid } from "../helpers/grid.js";
+import { figuration } from "../helpers/figuration.js";
+import { select } from "d3-selection";
+import { scaleLinear } from "d3-scale";
+import { ascending, max } from "d3-array";
+import { geoPath } from "d3-geo";
+
+const d3 = Object.assign(
+  {},
+  {
+    geoPath,
+    max,
+    scaleLinear,
+    ascending,
+    select,
+  }
+);
+
+export function joyplot(
+  selection,
+  projection,
+  options = {},
+  clipid,
+  width,
+  height
+) {
+  let k = options.k ? options.k : 100;
+  let fill = options.fill ? options.fill : "#508bab";
+  let stroke = options.stroke ? options.stroke : "white";
+  let strokeWidth = options.strokeWidth ? options.strokeWidth : 0.5;
+  let fillOpacity = options.fillOpacity ? options.fillOpacity : 1;
+  let strokeDasharray = options.strokeDasharray
+    ? options.strokeDasharray
+    : "none";
+  let strokeOpacity = options.strokeOpacity ? options.strokeOpacity : 1;
+
+  let mygrid = grid({
+    geojson: options.geojson,
+    blur: options.blur,
+    values: options.values,
+    projection: projection,
+    width: width,
+    height: height,
+    keep: true,
+    step: options.step,
+  })
+    .features.map((d) => ({
+      x: d.geometry.coordinates[0],
+      y: d.geometry.coordinates[1],
+      value: d.properties.value,
+    }))
+    .sort((a, b) => d3.ascending(a.y, b.y) || d3.ascending(a.x, b.x));
+
+  let ycoords = Array.from(new Set(mygrid.map((d) => d.y)));
+
+  let scale = d3
+    .scaleLinear()
+    .domain([0, d3.max(mygrid.map((d) => d.value))])
+    .range([0, k]);
+
+  let features = [];
+
+  ycoords.forEach((y) => {
+    let coords = [];
+    mygrid
+      .filter((d) => d.y == y)
+      .forEach((d) => coords.push([d.x, d.y - scale(d.value)]));
+
+    let linetring = {
+      type: "LineString",
+      coordinates: coords,
+    };
+
+    features.push({ type: "Feature", properties: {}, geometry: linetring });
+  });
+
+  // svg
+  //     .append("clipPath")
+  //     .attr("id", `clip_${clipid}`)
+  //     .append("path")
+  //     .datum({ type: "Sphere" })
+  //     .attr("d", d3.geoPath(projection));
+
+  selection
+    .append("clipPath")
+    .attr("id", "test")
+    .append("path")
+    .datum(options.geojson)
+    .attr("d", d3.geoPath(projection));
+
+  selection
+    .append("g")
+    //.attr("clip-path", clipid == null ? `none` : `url(#clip_${clipid})`)
+    //.attr("clip-path", `url(#test)`)
+    .attr("fill", fill)
+    .attr("stroke", stroke)
+    .attr("stroke-width", strokeWidth)
+    .attr("fill-opacity", fillOpacity)
+    .attr("stroke-opacity", strokeOpacity)
+    .attr("stroke-dasharray", strokeDasharray)
+    .selectAll("path")
+    .data(features)
+    .join("path")
+    .attr("d", d3.geoPath());
+}