Transform & Move

Montaris-X provides two spatial editing tools that understand the structure of your ROIs.

Transform Tool (T)

Scale and rotate ROIs using interactive handles.

• Selected ROI: Press T to transform the active ROI
• All ROIs: Press Shift+T to transform all layers simultaneously
• Drag corner handles to scale
• Drag the rotation handle to rotate
• Press Enter to apply, Escape to cancel

Component-Aware Mode

When transforming a single ROI, Montaris-X detects connected components (separate blobs within the same layer). Click on a specific component to transform just that piece — no need to split the layer first.

This uses scipy.ndimage.binary_propagation for fast component extraction, so even complex ROIs with many disconnected regions respond instantly.

Move Tool (V)

Reposition ROIs by dragging.

• Selected ROI: Press V to move the active ROI
• All ROIs: Press Shift+V to move all layers together
• Click and drag to reposition

Component-Aware Move

Like the Transform tool, Move is component-aware. Click on an individual connected component to move just that piece within the layer.

Affine Transforms

Under the hood, transforms use Pillow's Image.transform(AFFINE, NEAREST) for fast nearest-neighbor resampling. This preserves the binary nature of mask data (no interpolation artifacts) and handles large masks efficiently.

Undo Support

Both Transform and Move generate undo commands with crop-based diffs — only the affected bounding box is stored, keeping undo memory minimal even for large transforms.

Action	Shortcut
Transform active	T
Transform all	Shift+T
Move active	V
Move all	Shift+V
Apply	Enter
Cancel	Escape
Undo	Ctrl+Z