Score

In this part, score counter is implemented.

Score is increased on each successful action of the player. This adds another element of interactivity into the game and contributes a bit to player's involvement. From implementation standpoint, score display is similar to lives display, which can be used as a starting point for this object.

local vector = require "vector"

local score_display = {}
score_display.position = vector( 680, 32 )
score_display.score = 0

function score_display.update( dt )
end

function score_display.draw()
   love.graphics.print( "Score: " .. tostring( score_display.score ),
                        score_display.position.x,
                        score_display.position.y )
end

Score is updated each time a brick breaks. I add 10 score for simple brick and 30 for armored.

function score_display.add_score_for_simple_brick()
   score_display.score = score_display.score + 10
end

function score_display.add_score_for_cracked_brick()
   score_display.score = score_display.score + 30
end

These functions have to be called from bricks.brick_hit_by_ball.

function bricks.brick_hit_by_ball( i, brick, shift_ball, bonuses, score_display )
   if bricks.is_simple( brick ) then
      bonuses.generate_bonus(
         vector( brick.position.x + brick.width / 2,
                 brick.position.y + brick.height / 2 ),
         brick.bonustype )
      score_display.add_score_for_simple_brick()
      table.remove( bricks.current_level_bricks, i )
      simple_break_sound:play()
   elseif bricks.is_armored( brick ) then
      bricks.armored_to_scrathed( brick )
      armored_hit_sound:play()
   elseif bricks.is_scratched( brick ) then
      bricks.scrathed_to_cracked( brick )
      armored_hit_sound:play()
   elseif bricks.is_cracked( brick ) then
      bonuses.generate_bonus(
         vector( brick.position.x + brick.width / 2,
                 brick.position.y + brick.height / 2 ),
         brick.bonustype )
      score_display.add_score_for_cracked_brick()
      table.remove( bricks.current_level_bricks, i )
      armored_break_sound:play()
   elseif bricks.is_heavyarmored( brick ) then
      ball_heavyarmored_sound:play()
   end
end

function collisions.resolve_collisions( balls, platform,
                                        walls, bricks,
                                        bonuses, side_panel )
   collisions.balls_platform_collision( balls, platform )
   collisions.balls_walls_collision( balls, walls )
   collisions.balls_bricks_collision( balls, bricks, bonuses,
                                      side_panel.score_display )
   collisions.platform_walls_collision( platform, walls )
   collisions.platform_bonuses_collision( platform, bonuses,
                                          balls, walls,
                                          side_panel.lives_display )
end

function game.update( dt )
   balls.update( dt, platform )
   platform.update( dt )
   bricks.update( dt )
   bonuses.update( dt )
   walls.update( dt )
   side_panel.update( dt )
   collisions.resolve_collisions( balls, platform,
                                  walls, bricks,
                                  bonuses, side_panel )
   game.check_no_more_balls( balls, side_panel.lives_display )
   game.switch_to_next_level( bricks, levels )
end

3. Modifications to side_panel

side_panel.lives_display = lives_display
side_panel.score_display = score_display

function side_panel.update( dt )
   side_panel.lives_display.update( dt )
   side_panel.score_display.update( dt )
end

function side_panel.draw()
   side_panel.draw_background()
   side_panel.lives_display.draw()
   side_panel.score_display.draw()
end

function side_panel.reset()
   side_panel.lives_display.reset()
   side_panel.score_display.reset()
end

4. Modifications to "game"

function game.enter( prev_state, ... )
   local args = ...
   if prev_state == "gamepaused" then
      music:resume()
   end
   if prev_state == "gameover" or prev_state == "gamefinished" then
      side_panel.reset()
      music:rewind()
   end
   if args and args.current_level then
      bricks.clear_current_level_bricks()
      bonuses.clear_current_level_bonuses()
      levels.current_level = args.current_level
      local level = levels.require_current_level()
      bricks.construct_level( level )
      balls.reset()
      platform.remove_bonuses_effects()
      walls.remove_bonuses_effects()
   end      
end

5. Add life if score milestone is reached.

function game.update( dt )
   .....
   side_panel.lives_display.add_life_if_score_reached(
      side_panel.score_display.score )
   game.check_no_more_balls( balls, side_panel.lives_display )
   .....
end

local lives_display = {}
lives_display.position = vector( 680, 500 )
lives_display.lives = 5
lives_display.lives_added_from_score = 0

function lives_display.add_life_if_score_reached( score )
   local score_milestone = (lives_display.lives_added_from_score + 1) * 3000
   if score >= score_milestone then
      lives_display.add_life()
      lives_display.lives_added_from_score = lives_display.lives_added_from_score + 1
   end
end
   
function lives_display.reset()
   lives_display.lives = 5
   lives_display.lives_added_from_score = 0
end