2D Floor-Plan Editor

Original prompt

Build a simple 2D floor-plan editor where I can draw walls, add doors and windows, drag objects, and see room dimensions.

Chinese translation

构建一个简单的 2D 户型图编辑器，让我可以绘制墙体、添加门窗、拖动物体并查看房间尺寸。

Expected outcome

The deliverable should be an interactive 2D floor-plan editor with at least four core capabilities: wall drawing, doors and windows attached to walls, object placement and dragging, and room-dimension display. Coordinates, scale, and snapping should be consistent. Connected wall endpoints should form recognizable enclosed rooms, and openings should remain attached to their wall when moved. Object dragging should preserve selection and positional accuracy. Dimensions should state their units and measurement convention and update live when geometry changes. The UI should make tools and selection states discoverable and provide recovery from mistakes.

Additional verification guidance

• Draw a rectangle and a multi-room plan with T-junctions; verify endpoint snapping, closed-loop detection, room count, width, height, and area.
• Add doors and windows to different walls and drag them; ensure they do not detach, cross endpoints, or become invalid after wall resizing.
• Add, select, drag, and delete objects; verify hit testing, layering, coordinates, snapping, and full state restoration through undo/redo.
• Repeat edits after zooming and panning to validate screen-to-world conversion; check units, live dimension updates, save/load, and malformed-data handling.