Implement geom_GeomDensity2dFill

Contours of 2D density estimates would be very helpful in my Shiny application I'm developing which soon should be published.
We would like to use plotly.

Brief description of the problem:

Warning in geom2trace.default(dots[[1L]][[60L]], dots[[2L]][[1L]], dots[[3L]][[1L]]) :
  geom_GeomDensity2dFilled() has yet to be implemented in plotly.
  If you'd like to see this geom implemented,
  Please open an issue with your example code at
  https://github.com/ropensci/plotly/issues

Create plot with geom_density_2d_filled and this has not yet been implemented.

p <- ggplot(df, aes(Y_cm, X_cm)) + geom_density_2d_filled(contour_var="ndensity") 

从提供的 R 示例开始，使用 geom_density_2d_filled(contour_var="ndensity")，并追踪来自 geom2trace.default 的警告。将所请求的填充密度行为与 plotly.R 中现有的 geom 转换进行比较；完成标准是该示例不再发出警告，并渲染填充的 2D 密度等高线。