Instructions:
1. Click "Draw" on a path to start tracing
2. Click on the image to add points (first point = start)
3. Hold Shift to snap to horizontal/vertical lines
4. Edit the text field to adjust paths manually
5. Esc or End button to stop drawing

Path Direction:
Route paths must be drawn FROM source TO destination.
The pulse animates from the first point to the last point.
A green dot marks the START, red dot marks the END.