Simplify bounds clipping a tiny bit

internal/scenario/manage.go

@@ -1,10 +1,6 @@
 package scenario
 
 import (
-	//	"image"
-
-	"github.com/hajimehoshi/ebiten"
-
 	"code.ur.gs/lupine/ordoor/internal/maps"
 )
 
@@ -14,12 +10,6 @@ type CellPoint struct {
 }
 
 func (s *Scenario) CellAtCursor() (maps.Cell, CellPoint) {
-	x, y := ebiten.CursorPosition()
-	screenPos := CartPt{X: float64(s.Viewpoint.X + x), Y: float64(s.Viewpoint.Y + y)}
-	isoPos := screenPos.ToISO()
-	// Convert to cell coordinates.
-	// TODO: zoom support will need a camera
-	// FIXME: adjust for Z level
-
-	return s.area.Cell(int(isoPos.X), int(isoPos.Y), 0), CellPoint{IsoPt: isoPos, Z: s.ZIdx}
+	cell := s.area.Cell(int(s.selectedCell.X), int(s.selectedCell.Y), 0)
+	return cell, CellPoint{IsoPt: s.selectedCell, Z: 0}
 }