I worked a bit today on wrapping up the new physics-based dragging, and it’s working rather nicely. The main trick was to integrate the snapping into the movement, which initially didn’t work properly. It was snapping based on (at least one axis of) where the mouse was, not where the actual component was, which could be different if the component was blocked from following the mouse. It looked really odd (wrong) to see the component snap when the mouse was near a grid position far away.

The solution was to do two different move_and_slides. The first would try to move the component to the mouse. Then the component’s new position would be used to calculate a snapped position. Then the component would move_and_slide again to the snapped position. Either move_and_slide could end up blocked. The final snapped grid position would then be calculated from the ultimate world position of the component (either an actual grid coordinate or null if not within snapping distance of one).

There were a couple of minor things to fix (including changing the spherical collision shape to a cylindrical one, as snapping and setting into the sparse nodes would crash the code if there was already one there), but in the end, it seems to be working. Which makes me happy, especially given where I was a couple of days ago: on the verge of giving up and putting it off.

It’s hard to believe the month is almost up.

Day 28: four weeks in.