asteroid collision

main.lua

@@ -31,6 +31,7 @@ function love.load()
     for asteroidIndex, asteroid in ipairs(asteroids) do
         asteroid.angle = love.math.random() * (2 * math.pi)
     end
+    asteroidRadius = 80
 end
 
 function love.update(dt)
@@ -77,10 +78,19 @@ 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
-        asteroid.y = (asteroid.y + math.cos(asteroid.angle) * asteroidSpeed * dt) % arenaHeight
+        asteroid.y = (asteroid.y + math.sin(asteroid.angle) * asteroidSpeed * dt) % arenaHeight
+
+        if areCirclesIntersecting(shipX, shipY, shipRadius, asteroid.x, asteroid.y, asteroidRadius) then
+            love.load()
+            break
+        end
     end
 end
 
@@ -107,7 +117,7 @@ function love.draw()
 
             for asteroidIndex, asteroid in ipairs(asteroids) do
                 love.graphics.setColor(1, 1, 0)
-                love.graphics.circle('fill', asteroid.x, asteroid.y, 80)
+                love.graphics.circle('fill', asteroid.x, asteroid.y, asteroidRadius)
             end
         end
     end
@@ -118,5 +128,6 @@ function love.draw()
         'shipAngle:' .. shipAngle,
         'shipX: ' .. shipX,
         'shipSpeedX: ' .. shipSpeedX,
+        'a1: ' .. asteroids[1].angle
     }, '\n'))
 end