fix: Fix potential divide by 0 in Viewport.resetCamera

[abustany]

getExtent returns array indices, not dimensions. This fixes a division by zero when displaying 1x1 pixel images.

Context

Displaying 1x1 pixel images fails

Changes & Results

Viewport.resetCamera computes widths/heights using VTK's getExtent function, but that function return indices, not dimensions. This PR fixes the computation to correct the off-by-one error.

Testing

Checklist

PR

• [x] My Pull Request title is descriptive, accurate and follows the semantic-release format and guidelines.

Code

• [x] My code has been well-documented (function documentation, inline comments, etc.)

Public Documentation Updates

• [ ] The documentation page has been updated as necessary for any public API additions or removals.

Tested Environment

• [x] OS: macOS
• [x] Node version: 22
• [x] Browser: Firefox 146

[sedghi]

Do you have a 1x1 pixel image that we can test this with?

[abustany]

Do you have a 1x1 pixel image that we can test this with?

In our case it's a placeholder image that is generated (basically we build the pixel data by hand and have a custom loader). I did generate one using The Gimp though, attaching it here.

1px.dcm.zip