Set Time Scale

In Speculate Mode, recorded data is stretched over a chosen duration. Enter total time below:

Total duration: 10 seconds

Switch Mode?

Switching modes will erase all recorded data. Do you want to continue?

Clear All Paths?

This will delete all recorded paths. This action cannot be undone.

Export Preview

The following files will be included in your ZIP:

No data to export

Upload Files

Drag & drop files here

or use the buttons below
Mondrian in action - tracing movement paths over a floor plan synchronized to video

Mondrian

Transcribe movement from video into position data

Upload your files

Load a floor plan image and video (or just floor plan for Speculate mode)

Click to record paths

Click to start tracing, click to pause. Record multiple paths with different colors.

Keyboard shortcuts

F forward, R rewind through video and recording

Export your data

Download a ZIP with CSV files for each path and your floor plan image

All data stays in your browser. Auto-backup saves your work locally in case of errors.
Demo
Credits & Citation

Open-source project built with Svelte and p5.js (GPL 3.0). Developed by Ben Rydal Shapiro, Edwin Zhao, and contributors. If using Mondrian in your work, kindly reference: Shapiro, B.R., Silvis, D., & Hall, R. (2025). Visualization as Theory and Experience. Journal of the Learning Sciences. DOI: 10.1080/10508406.2025.2537945

Upload a floor plan and video to get started

Delete Path?

This will delete the selected path and all its recorded points.