Weekly Update #2 - Drag and drop
Added 2020-12-25 00:53:18 +0000 UTC
https://giant.gfycat.com/EsteemedVapidCobra.webm
We want moving units around to be as simple and easy as possible using drag and drop. Using Unit's Event Pointer Handler interfaces, we have access to OnBeginDrag(), OnDrag(), and OnEndDrag() which we'll trigger on the Unit itself.
OnBeginDrag() {
disable unit's collider so that we can raycast behind it
raise sorting layer
saved tile = starting tile
}
OnDrag() {
set transform to mouse position
if hovering over an empty tile, save it
if hovering over an occupied tile, save it
if hovering over another unit, save it
}
OnEndDrag() {
if in the sell zone, sell the unit
if saved unit, swap places with it
if no unit to swap with, use the saved tile
reenable collider
reset sorting layer
}
There's a few more rules like not allowing drags during battle, and end drags on the enemy side of the field. Also checking the unit limit while still allowing tile swaps on the battlefield.
We also check whether we are moving the ally to the Bench or to the Field
Usability:
We use boxes that cover the entire tile as the colliders that the mouse can click, a lot of users may try to click the center of the character, but that won't work with multiple units next to each other. The only unoccupied space is on the tiles themselves.
We slightly highlight the occupied tiles and when hovering over a unit. Maybe we can highlight the saved tile while dragging too. May need to check if it's valid before that.
