This mod allows you to created colored overlays which can be used to plan new factories.
How to use:
Use the planning tool (needs research) to create the overlays. The GUI (pops up after the 1st click with the planning tool) can be used to select the current color (6 different ones atm). The 7th “color” is a remove tool to delete single tiles.
Also there are checkboxes to toggle the mode (freehand or retanglemode), select if the rectangle should be filled or not (only if rectanglemode is enabled), toggle if overwriting is allowed or not and a checkbox to enable a checkerboard pattern.
Last but not least the GUI contains buttons to hide or delete all overlays at once.