Game Over

Ok, the game is almost complete.

It is still missing one important part - the game over condition. The mechanics is simple. We need to remove one life if all the ball escape throught the bottom part of the screen. Then we need to make changes in our life-keeping variable. If the amount of lives becomes less than zero, we show the game over screen.

Lets start from decreasing lives condition. We can implement it using existing setup with bottom wall and monitor ball collision with this wall. Alternatively we can just monitor ball y coordinate. If it becomes greater than screen height, we remove the ball. I'll use the second method and remove the bottom wall.

function Ball:update( dt, platform )
   self.position = self.position + self.speed * dt
   if self.stuck_to_platform then
	  self:follow_platform( platform )
   end
   self.collider_shape:moveTo( self.position:unpack() )
   self:check_escape_from_screen()
end

function Ball:check_escape_from_screen()
   local x, y = self.position:unpack()
   local ball_top = y - self.radius
   if ball_top > love.window.getHeight() then
	  self.to_destroy = true
   end
end

function BallsContainer:update( dt, platform )
   for i, ball in pairs( self.balls ) do
	  ball:update( dt, platform )
	  if ball.to_destroy then
	 ball.collider:remove( ball.collider_shape )
	 table.remove( self.balls, i )
	  end
   end   
end

If there are no more balls in the ballcontainer, we decrease the lives counter. If the amount of remaining lives drops below zero, we switch to gameover screen.

function game:update( dt )
   platform:update( dt )
   balls_container:update( dt, platform )
   check_no_more_balls()
   bricks_container:update( dt )
   bonuses_container:update( dt )
   walls_container:update( dt )
   side_panel:update( dt )
   resolve_collisions( dt )   
   switch_to_next_level()
end

function check_no_more_balls( platform )
   if balls_container then
	  if #balls_container.balls == 0 then
	 side_panel:lose_life()
	 if side_panel.life_display.life < 0 then
		Gamestate.switch( gameover,
				  { level_sequence = level_sequence,
				level_counter = level_counter,
				level = level,
				collider = collider,
				balls_container = balls_container,
				platform = platform,
				walls_container = walls_container,
				bricks_container = bricks_container,
				bonuses_container = bonuses_container,
				side_panel = side_panel } )
	 else	 
		reposition_the_ball( platform )
	 end
	  end
   end
end

function check_no_more_balls()
   if #balls_container.balls == 0 then
	  side_panel:lose_life()
	  if side_panel.life_display.life < 0 then
	 Gamestate.switch( game, { level_counter = 1 } )
	  else	 
	 reposition_the_ball()
	  end
   end
end

function reposition_the_ball( platform )
   balls_container = BallsContainer:new( { collider = collider } )
   balls_container:balls_follow_platform( platform )
end

function BallsContainer:balls_follow_platform( platform )
   for i, ball in pairs( self.balls ) do
	  ball:follow_platform( platform )
   end
end

function SidePanel:lose_life()
   self.life_display:lose_life()
end

The draw method of GameOver gamestate just prints 'Game Over!' message.

function gameover:enter( previous_state, ... )
   game_objects = ...
end


function gameover:update( dt )
end

function gameover:draw()
   for _,obj in pairs( game_objects ) do
	  if type(obj) == "table" and obj.draw then
	 obj:draw()
	  end
   end
   self:cast_shadow()
   
   local oldfont = love.graphics.getFont()
   love.graphics.setFont( bungee_font )
   love.graphics.printf( "Game Over!",
			 158, 110, 300, "center" )
   love.graphics.setFont( oldfont )
end

On left mouse button press or enter, game restarts from level 1. On RMB or Esc - quits.

function gameover:keyreleased( key, code )
   if key == 'return' then
	  Gamestate.switch( game, { level_counter = 1 } )
   elseif  key == 'escape' then
	  love.event.quit()
   end    
end

function gameover:mousereleased( x, y, button )
   if button == 'l' then
	  Gamestate.switch( game, { level_counter = 1 } )
   elseif button == 'r' then
	  love.event.quit()
   end   
end

There are no buttons in this gamestate. And I have also removed buttons from the Gamepaused gamestate to match the style.

TODO: в add new ball передавать также stick_to_platform прошлого мяча TODO: add puase on RMB from game gamestate and changes in gamepaused gamestate TODO: выход из титров по RMB TODO: упрощенный gamepause