Make cities destroyable

bundle/main.lua

@@ -80,7 +80,8 @@ function spawnMissile(x, y, dx, dy)
 		reflected = false,
 		history = {
 			{x = x, y = y}
-		}
+		},
+		alive = true
 	})
 end
 
@@ -121,6 +122,19 @@ function updateMissiles(dt)
 			collided = true
 		end
 
+		for _, city in ipairs(cities) do
+			local city_left = city.x - city_width/2
+			local city_right = city.x + city_width/2
+			local city_top = city.y - city_height/2
+			local city_bottom = city.y + city_height/2
+			if city.alive and city_left <= missile.x and missile.x <= city_right and city_top <= missile.y and missile.y <= city_bottom then
+				-- Destroy city
+				city.alive = false
+				-- Destroy missile
+				missile.alive = false
+			end
+		end
+
 		if collided then
 			table.insert(missile.history, 1, {
 				x = missile.x,
@@ -135,8 +149,8 @@ function updateMissiles(dt)
 
 	local i = 1
 	while i <= #missiles do
-		if missiles[i].y > 1 + missile_radius then
-			-- Went off the bottom of the screen, delete
+		if missiles[i].y > 1 + missile_radius or not missiles[i].alive then
+			-- Went off the bottom of the screen or exploded, delete
 			table.remove(missiles, i)
 		else
 			i = i +1