3D surface plotly_relayout does not trigger with touch drag. Scroll zoom reports older camera vector.

This is probably similar to https://github.com/plotly/plotly.js/issues/134
The plotly_relayout do trigger with mouse drag correctly.
However, this is not the case for touch drag.

To reproduce the problem please try open
https://plotly.com/javascript/3d-surface-plots/
and execute
document.getElementById("myDiv_1").on('plotly_relayout',()=>{console.log("relayout")});
you can see that the console doesn’t log when using touch emulator.

I also tested with https://cdn.plot.ly/plotly-latest. The problem is still reproducible.

Another problem is mouse scroll zoom. The plotly report older camera vector. After subscribe to plotly_relayout, please then do mouse scroll zoom and execute

Plotly.relayout(document.getElementById("myDiv_1"), document.getElementById("myDiv_1")._fullLayout.scene.camera );

You will notice this the camera position is not always current. This is not problem when pan (right click drag) or rotate view.

https://plotly.com/javascript/3d-surface-plots/ の 3D サーフェスプロットの例から始め、提供されている plotly_relayout リスナーを使って両方の動作を再現します。要素の _fullLayout.scene.camera を調べながら、タッチドラッグイベントとマウスホイールによるズームを、パンおよび回転と比較します。タッチドラッグによって plotly_relayout が発生し、ホイールによるズームで現在のカメラベクトルが報告されれば完了です。