Click to draw a joint and connect lines.
Click and drag on a joint to move it to a new position.
Click on a stroke to insert new joint.
Shift+Click to delete a joint.
Control+Click to start a new path.
Control+Shift+Click on a stroke to change style.
Press C to close last edit line
Press O to open last edit line
Press P to open or close parameters tab.
Press G to generate the GCode.