destructible asteroids

main.lua

@@ -13,6 +13,7 @@ function love.load()
     bullets = {}
     bulletTimerLimit = 0.5
     bulletTimer = bulletTimerLimit
+    bulletRadius = 5
 
     asteroids = {
         {
@@ -53,6 +54,10 @@ function love.update(dt)
     shipX = (shipX + shipSpeedX * dt) % arenaWidth
     shipY = (shipY + shipSpeedY * dt) % arenaHeight
 
+    local function areCirclesIntersecting(aX, aY, aRadius, bX, bY, bRadius)
+        return (aX - bX) ^ 2 + (aY - bY) ^ 2 <= (aRadius + bRadius) ^ 2
+    end
+
     for bulletIndex = #bullets, 1, -1 do
         local bullet = bullets[bulletIndex]
         bullet.timeLeft = bullet.timeLeft - dt
@@ -63,6 +68,14 @@ function love.update(dt)
             bullet.x = (bullet.x + math.cos(bullet.angle) * bulletSpeed * dt) % arenaWidth
             bullet.y = (bullet.y + math.sin(bullet.angle) * bulletSpeed * dt) % arenaHeight
         end
+        for asteroidIndex = #asteroids, 1, -1 do
+            local asteroid = asteroids[asteroidIndex]
+            if areCirclesIntersecting(bullet.x, bullet.y, bulletRadius, asteroid.x, asteroid.y, asteroidRadius) then
+                table.remove(bullets, bulletIndex)
+                table.remove(asteroids, asteroidIndex)
+                break
+            end
+        end
     end
 
     bulletTimer = bulletTimer + dt
@@ -78,10 +91,6 @@ function love.update(dt)
         end
     end
 
-    local function areCirclesIntersecting(aX, aY, aRadius, bX, bY, bRadius)
-        return (aX - bX) ^ 2 + (aY - bY) ^ 2 <= (aRadius + bRadius) ^ 2
-    end
-
     for asteroidIndex, asteroid in ipairs(asteroids) do
         local asteroidSpeed = 20
         asteroid.x = (asteroid.x + math.cos(asteroid.angle) * asteroidSpeed * dt) % arenaWidth
@@ -121,13 +130,4 @@ function love.draw()
             end
         end
     end
-
-    love.graphics.origin()
-    love.graphics.setColor(1, 1, 1)
-    love.graphics.print(table.concat({
-        'shipAngle:' .. shipAngle,
-        'shipX: ' .. shipX,
-        'shipSpeedX: ' .. shipSpeedX,
-        'a1: ' .. asteroids[1].angle
-    }, '\n'))
 end