Constraints¶

A constraint is a rule the sketch keeps true, such as "this line stays horizontal". Change one size and everything that depends on it moves.

Blue curves can still move, white curves are fully defined, and red means two rules disagree.

A line drawn within about 3 degrees of horizontal or vertical is made exact for you. For everything else, pick a constraint from the Constrain button and click the shapes it needs. Right-clicking a selection lists only the constraints that fit it.

The Relations list at the bottom of the palette shows every rule, one row each. Hover to see where it applies, and use the x to delete it.