Layer Transform & Bounds Planner

Calculate a layer transform, rotated corners and canvas bounds.

Try an example: A rotated photo on a cover

How it works

Enter canvas and layer dimensions, center position, rotation and flips. Get the affine matrix for normalized layer coordinates plus exact corner and bounding-box coordinates.

For layer-local coordinates u/v from 0 to 1, canvas x = a*u + c*v + e and y = b*u + d*v + f.
The layer rotates around its center. Flips apply in local space before rotation. Coordinates outside the canvas are retained.
The same affine transform is used by Design Layers for selection, dragging and mask coordinates.

Sources

Photopea: layers, masks and transforms workflow inspiration (Photopea)

For scripts and AI agents

JSON API: POST https://luminalayertransform.usefulweb.site/api/v1/calculate (same calculation as this page)
Interface description: OpenAPI 3.1 · AI guide: llms.txt
MCP server (Streamable HTTP): https://luminalayertransform.usefulweb.site/mcp · tool name lumina_layer_transform

Example request

curl -s -X POST https://luminalayertransform.usefulweb.site/api/v1/calculate \
  -H 'content-type: application/json' \
  -d '{"canvasWidth":1000,"canvasHeight":700,"width":600,"height":400,"x":500,"y":350,"rotation":20}'