Add enemies

bundle/main.lua

@@ -13,9 +13,14 @@ local cities = {}
 local city_radius = 0.05
 
 local explosions = {}
-local explosion_radius = 0.05
+local explosion_radius = 0.08
 local explosion_duration = 0.4
 
+local enemies = {}
+local enemy_radius = 0.025
+local enemy_min_shoot = 5
+local enemy_max_shoot = 10
+
 local window_width = nil
 local window_height = nil
 local viewport_x_offset = nil
@@ -55,9 +60,8 @@ function love.load()
 	setScreenDimensions(width, height)
 	movePaddle(0)
 	spawnCities()
-	spawnMissile(0.5, 0.1, cities[3].x, cities[3].y, 0.2)
-	spawnMissile(0.1, 0.3, cities[7].x, cities[7].y, 0.2)
-	spawnMissile(0.1, 0.3, cities[3].x, cities[3].y, 0.2)
+	spawnEnemy(0.5, 0.1)
+	spawnEnemy(0.1, 0.3)
 end
 
 function spawnCities()
@@ -103,6 +107,14 @@ function spawnExplosion(x, y)
 	})
 end
 
+function spawnEnemy(x, y)
+	table.insert(enemies, {
+		x = x,
+		y = y,
+		until_shoot = math.random() * (enemy_max_shoot - enemy_min_shoot)
+	})
+end
+
 function updateMissiles(dt)
 	for _, missile in ipairs(missiles) do
 		missile.x = missile.x + missile.dx * dt
@@ -215,11 +227,23 @@ function updateExplosions(dt)
 	end
 end
 
+function updateEnemies(dt)
+	for _, enemy in ipairs(enemies) do
+		enemy.until_shoot = enemy.until_shoot - dt
+		if enemy.until_shoot < 0 then
+			enemy.until_shoot = enemy_min_shoot + math.random() * (enemy_max_shoot - enemy_min_shoot)
+			local target = cities[math.random(1, #cities)]
+			spawnMissile(enemy.x, enemy.y, target.x, target.y, 0.2)
+		end
+	end
+end
+
 function love.update(dt)
 	updateMissiles(dt)
 	updateExplosions(dt)
+	updateEnemies(dt)
 
-	if #explosions == 0 and #missiles == 0 then
+	if #explosions == 0 and #missiles == 0 and #enemies == 0 then
 		love.event.quit()
 	end
 end
@@ -312,10 +336,20 @@ function drawExplosions()
 	end
 end
 
+function drawEnemies()
+	for _, enemy in ipairs(enemies) do
+		love.graphics.setColor(0.7, 0.5, 1)
+		local x, y = toScreenCoordinates(enemy.x, enemy.y)
+		local radius = toScreenSize(enemy_radius)
+		love.graphics.circle('fill', x, y, radius)
+	end
+end
+
 function love.draw()
 	drawCities()
 	drawWalls()
 	drawMissiles()
 	drawPaddle()
+	drawEnemies()
 	drawExplosions()
 end