leowoerteler / sudokugrid Goto Github PK

We would like to add the capability with a new keyword in the text file.

The feature will draw a rectangle around a group of candidates, using similar line weight and colour settings as existing elements.

The rectangle setting should specify a candidate, and cell (from) and to, and will highlight a group feature suitable for adding link lines to a group of candidates.

An example image sample is provided with clumsily painted boxes!

When processing the grid, if a lone candidate has a peer in any house, then it should be treated as a naked single rather than as a given or solved cell.

Prefixing 0 to a lone candidate with no peer should still enable that candidate to appear as a naked single as per current behaviour.

Additionally, prefixing with '+' or similar should force a candidate which would otherwise be a naked single to be treated as a given, whereas a '*' prefix would treat the digit as solved (make it blue)