Add geomPointDensity support in JointPlot

Author: MKoroteev-HORIS

demo/jvm-batik/src/main/kotlin/frontendContextDemo/scripts/JointPlot.kt

@@ -66,6 +66,12 @@ object JointPlot {
                         scaleFillGradient(low = "#d95f0e", high = "#fff7bc")
                 p.show()
             }
+
+            run {
+                val p =
+                    jointPlot(irisData, "petal length (cm)", "petal width (cm)", colorBy = "target", geom = "pointdensity")
+                p.show()
+            }
         }
     }
 }

plot-api/src/commonMain/kotlin/org/jetbrains/letsPlot/bistro/common/Plot2dUtil.kt

@@ -136,6 +136,17 @@ object Plot2dUtil {
                 }
             }
 
+            "pointdensity" -> {
+                geomPointDensity(
+                    color = color,
+                    size = size,
+                    alpha = alpha,
+                    showLegend = showLegend
+                ) {
+                    fill = colorBy.takeIf { it != null } ?: "..density.."
+                }
+            }
+
             "none" -> DummyFeature
 
             else -> throw IllegalArgumentException("Unknown geom: $geomKind")

plot-api/src/commonMain/kotlin/org/jetbrains/letsPlot/bistro/joint/JointPlot.kt

@@ -20,7 +20,7 @@ package org.jetbrains.letsPlot.bistro.joint
  * @param data The data to be displayed.
  * @param x Name of the variable.
  * @param y Name of the variable.
- * @param geom default = "point" ("point", "tile", "density2d", "density2df", "none").
+ * @param geom default = "point" ("point", "tile", "density2d", "density2df", "pointdensity", "none").
  *  The geometric object to use to display the data. No object will be used if `geom="none"`.
  * @param bins Number or a Pair of Numbers.
  *  Number of bins in both directions, vertical and horizontal. Overridden by `binWidth`.