1 files changed, 40 insertions, 17 deletions
diff --git a/go/ui/mapView.go b/go/ui/mapView.go
index 6c887920..c966f1a8 100644
--- a/go/ui/mapView.go
+++ b/go/ui/mapView.go
@@ -132,20 +132,25 @@ func (vw *MapView) drawMapLayer(screen *ebiten.Image) {
 	screen.DrawImage(vw.mapLayer, &ebiten.DrawImageOptions{})
 }
 
+func getPermanentSymbol(p game.Permanent, i int) *ebiten.Image {
+	permanentSymbol := assets.GetSymbol(strings.ToLower(p.GetCard().Name))
+	if permanentSymbol == nil {
+		symbol := fmt.Sprintf("%c%d", unicode.ToUpper(rune(p.GetCard().Type.String()[0])), i)
+		permanentSymbol = assets.GetGenericSymbol(symbol)
+		if permanentSymbol == nil {
+			log.Fatalf("Failed to generate generic symbol %s", symbol)
+		}
+	}
+
+	return permanentSymbol
+}
+
 func (vw *MapView) drawPermanentsLayer(screen *ebiten.Image) {
 	if vw.permanentsLayer == nil {
 		vw.permanentsLayer = vw.newLayerImage()
 
 		for i, p := range vw.gameState.Permanents {
-			permanentSymbol := assets.GetSymbol(strings.ToLower(p.GetCard().Name))
-			if permanentSymbol == nil {
-				symbol := fmt.Sprintf("%c%d", unicode.ToUpper(rune(p.GetCard().Type.String()[0])), i)
-				permanentSymbol = assets.GetGenericSymbol(symbol)
-				if permanentSymbol == nil {
-					log.Fatalf("Failed to generate generic symbol %s", symbol)
-				}
-			}
-
+			permanentSymbol := getPermanentSymbol(p, i)
 			t := p.GetTile()
 			x_px := t.Position.X*TILE_WIDTH + (TILE_WIDTH-PERMANENT_WIDTH)/2
 			y_px := t.Position.Y*TILE_HEIGHT + (TILE_HEIGHT-PERMANENT_HEIGHT)/2
@@ -178,19 +183,37 @@ func (vw *MapView) ForceRedraw() {
 	vw.permanentsLayer = nil
 }
 
-func (vw *MapView) FindObjectAt(x_px, y_px int) interface{} {
-	x := x_px / TILE_WIDTH
-	y := y_px / TILE_HEIGHT
+func isSymbolTransparentAt(p game.Permanent, relativeX, relativeY int) bool {
+	permanentSymbol := getPermanentSymbol(p, 0)
+	_, _, _, alpha := permanentSymbol.At(relativeX, relativeY).RGBA()
+	return alpha == 0
+}
+
+func (vw *MapView) FindObjectAt(screenX, screenY int) interface{} {
+	x := screenX / TILE_WIDTH
+	y := screenY / TILE_HEIGHT
 
 	if x < 0 || y < 0 {
 		return nil
 	}
 
-	// TODO: detect if a permanent or the containing tile was selected
-	for _, u := range vw.gameState.Permanents {
-		pos := u.GetTile().Position
-		if pos.X == x && pos.Y == y {
-			return u
+	relativeX := screenX % TILE_WIDTH
+	relativeY := screenY % TILE_HEIGHT
+	xMargin := (TILE_WIDTH - PERMANENT_WIDTH) / 2
+	yMargin := (TILE_HEIGHT - PERMANENT_HEIGHT) / 2
+	// detect if a permanent or the containing tile was selected
+	if relativeX >= xMargin && relativeX <= TILE_WIDTH-xMargin &&
+		relativeY >= yMargin && relativeY <= TILE_HEIGHT-yMargin {
+
+		for _, p := range vw.gameState.Permanents {
+			pos := p.GetTile().Position
+			if pos.X == x && pos.Y == y {
+				if isSymbolTransparentAt(p, relativeX, relativeY) {
+					break
+				}
+
+				return p
+			}
 		}
 	}