Select tool: visualize the separate concepts of tooling pivot and graphical data origin

[0HyperCube]

There will be two different dots, which the Select tool can toggle between (using a checkbox or radio button near the 9-dot widget in the tool's control bar).

There will be a dropdown in the Select tool's control bar to choose which one the user wants to visualize and use. The pivot shall remain the default. Currently, the tooling uses the pivot as the point around which rotation and scaling occurs for:

• G/R/S
• Resizing the corners of the transform cage when Alt is pressed.

But it will end up using which ever type of dot (pivot or origin) is chosen for those, instead of just the pivot.

• Pivot

  

  This is the yellow (final color TBD) crosshair symbol. It's the temporary/transient pivot. Equivalent to Blender's 3D cursor, but isn't global to the document nor is it as persistent as the 3D cursor. It's used only for tooling, not part of the node graph data or document format. This is our current implementation, but it will need to be tweaked:

  • Currently, we store the pivot permanently on each layer, but this can lead to confusion if the user comes back later and finds it in an unexpected location (especially since scaling can affect it in weird ways). This also makes the code more difficult because we have to save tooling-level data into the serialized document. Remove the per-layer, persistent storage.
  • Make it so each layer that the user clicks will have the pivot set to its corresponding corner/midpoint/center of the 9-dot widget (located in the tool's control bar). Switching from one layer to the next keeps that chosen position of the 9-dot widget.
  • The user can drag the yellow dot anywhere in the canvas. Clicking away from the current layer (by deselecting it, or by selecting another layer instead; however not by adding to the selection if the existing layer remains selected) resets it, going back to the selected position of the 9-dot widget.

    • But the user can "pin" the dragged location.

      

      Then, no matter what selection changes occur, that remains the location of the pivot until unpinned or until clicking any of the 9 dots in the 9-dot widget again which unpins it. Perhaps double-clicking the yellow dot can pin/unpin.

• Origin

  

  This is the blue (final color TBD) dowel pin symbol. It's the origin ((0, 0) point) of the vector data's internal coordinate space. This is used when transforming in the Transform node's properties panel parameters, or when using the Copy to Points node. Its drag will be stored in the "Origin: Offset" parameter of the Transform node (but for now, we don't have that yet, so the origin is visualized but not draggable for now):