Allow user to override draw function in GridImageryProvider

This came up in https://github.com/AnalyticalGraphicsInc/cesium/pull/8280. The idea is to make it easy for the developer to create effects like this hexagonal grid by allowing them to override the draw function in the GridImageryProvider:

Cesium.Viewer('container', {
  imageryProvider: Cesium.GridImageryProvider({
    cells: 3,
    drawGrid: function(context) {
      // `context` is the canvas 2d context,
      // you can use it to draw what you want.
    }
  })
});

Is this something you would use in your application? If so, please 👍 or describe your use case in this issue. Right now this is still possible to do by creating a custom imagery provider based off of the GridImageryProvider in your application.

[ghost]

I`m also trying to build a MGRS grid, kinda like a lat/long grid, but a bit more complex. So I need to take into consideration zoom, camera position and so on, and an imageryprovider this flexible would be great to work with.

[AOldDriverA]

The grid I’m drawing now is DQG( degenerate quadtree grid) based on primitives：

Now I can’t draw it on tiles, because if you project it in two dimensions:

Since I can’t draw DQG based on quadtree tiles, I draw them with primitives: Cesium.RectangleOutline and Cesium.Rectangle. Drawing grids with primitives have some problems such as linewidth is 1 and have to compute a lot every frame. So I want to draw it based on tiles. But I don’t know how to tile map following DQG scheme. I will be more than happy to share my ideas and code if I solve this problem. (Excuse my poooooor English) Sent from Mail for Windows 10 From: Omar Shehata Sent: 2019年10月24日 21:11 To: AnalyticalGraphicsInc/cesium Cc: AOldDriverA; Mention Subject: Re: [AnalyticalGraphicsInc/cesium] Allow user to override drawfunction in GridImageryProvider (#8282)

@AOldDriverA can you share a bit about your application and what you’re visualizing with a custom grid? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or unsubscribe.