implement basic ShootEffect

obj/game/Player.lua

@@ -36,6 +36,7 @@ function Player:update(dt)
     -- controls
     if input:down('left') then self.r = self.r - self.rv*dt end
     if input:down('right') then self.r = self.r + self.rv*dt end
+    if input:pressed('action') then self:shoot() end
 
     -- update velocity
     self.v = math.min(self.v + self.a*dt, self.max_v)
@@ -62,4 +63,10 @@ function Player:draw()
     love.graphics.circle('line', self.x, self.y, self.w)
 end
 
+function Player:shoot()
+    local d = 1.2*self.w
+    local offset_x, offset_y = self.x + d*math.cos(self.r), self.y + d*math.sin(self.r)
+    self.area:addGameObject('ShootEffect', offset_x, offset_y, {player = self, d = d})
+end
+
 return Player

obj/game/ShootEffect.lua

@@ -0,0 +1,31 @@
+---@class ShootEffect:GameObject
+---@field player Player|nil
+---@field d number
+local ShootEffect = GameObject:extend()
+
+function ShootEffect:new(area, x, y, opts)
+    ShootEffect.super.new(self, area, x, y, opts)
+    self.w = 8
+    self.timer:tween(0.4, self, {w = 0}, 'in-out-cubic', function() self:kill() end)
+end
+
+---Updates ShootEffect
+---@param dt number delta time
+function ShootEffect:update(dt)
+    ShootEffect.super.update(self, dt)
+    if self.player then
+        self.x = self.player.x + self.d*math.cos(self.player.r)
+        self.y = self.player.y + self.d*math.sin(self.player.r)
+    end
+end
+
+---Draws ShootEffect
+function ShootEffect:draw()
+    ShootEffect.super.draw(self)
+    pushRotateScale(self.x, self.y, self.player.r+math.pi/4)
+    love.graphics.setColor(0.6, 0.5, 0.1)
+    love.graphics.rectangle('fill', self.x - self.w/2, self.y - self.w/2, self.w, self.w)
+    love.graphics.pop()
+end
+
+return ShootEffect