[LKasianAnsys]

Issue

Resolves #31

Context

Until now, the orthographic view ruler's displayed scale value did not adjust with the canvas in SERVER mode, and the orientation widget did not resize with the canvas in either CLIENT or SERVER mode. In this PR, the ruler on every canvas resize change. The orientation widget is now set to 0.15x the canvas's shorter side in both modes.

Manual check,
In SERVER mode: Start a VISOR session with a dataset and with a unit passed via Metadata. Turn on the orthographic view, and see the ruler. Zoom in and out, and/or resize the canvas window. Notice the scale value updates accordingly.
In SERVER and CLIENT mode: Start a VISOR session with a dataset. Resize the window; the orientation widget scales with the canvas size.

Copilot summary

This pull request introduces improvements to how the orientation widget is sized and kept in sync with the render window during resizes, as well as infrastructure to notify listeners of canvas resizes and propagate those changes through the rendering pipeline. It also adds comprehensive tests to ensure correct resize handling and updates the server and client code to keep the view and camera state consistent after resizes.

Orientation widget sizing and resize propagation:

• The orientation widget is now automatically fitted to a fraction of the render window's shorter side whenever the window is resized, ensuring consistent appearance and usability. This is achieved by adding a fit_to_window method to VisorOrientationWidget and invoking it during viewport size changes. [1] [2] [3] [4]

Canvas resize event infrastructure:

• The IServerCanvas interface and its implementation now support addResizeListener, allowing other components to be notified when the canvas is resized to a non-zero size. This infrastructure is used to trigger camera state updates and widget resizing in response to user or system-initiated resizes. [1] [2] [3] [4] [5] [6]

Renderer and camera state updates:

• The server-side renderer (ServerRenderer) now listens for canvas resize events and updates all camera listeners with the new viewport height, ensuring camera state remains accurate. The viewport height calculation is now truncated to match server-side sizing. [1] [2] [3] [4]

Frontend and widget integration:

• The orientation widget is now properly managed and resized in the WebAssembly renderer (WasmRenderer), and unused or commented-out code related to orientation widget instantiation in the frontend has been cleaned up. [1] [2] [3] [4] [5]

Testing and validation:

• New and updated Jest tests verify that resize listeners are called appropriately, camera listeners receive correct viewport heights after resizes, and the orientation widget is resized based on the window's new dimensions. [1] [2] [3] [4] [5] [6] [7] [8]

These changes together provide a robust and extensible mechanism for handling canvas and window resizes, keeping the UI elements and camera state in sync with the underlying render window.