Mouse Controls

In this part I want to implement mouse controls for the game.

We need to make the platform follow the mouse coursor and launch the ball on mouse keypress.

To make platform follow the mouse we can read the coursor position and then move the platform in it's direction. The first problem is that mouse controls confilct with keyboard. We can't move platform to the coursor and make it react on arrow keys simultaneously. It could be possible to retain keyboard controls if the coursor is outside the game window. Unfortunately, love doesn't provide an easy way to check it. Keyboard controls have to be dropped:

function platform.update( dt )
   platform.follow_mouse( dt )
end

function platform.follow_mouse( dt )
   local x, y = love.mouse.getPosition()
   local left_wall_plus_half_platform = 34 + platform.width / 2
   local right_wall_minus_half_platform = 576 - platform.width / 2
   if ( x > left_wall_plus_half_platform and
        x < right_wall_minus_half_platform ) then
      platform.position.x = x - platform.width / 2
   elseif x < left_wall_plus_half_platform then
      platform.position.x =
         left_wall_plus_half_platform - platform.width / 2
   elseif x > right_wall_minus_half_platform then
      platform.position.x =
         right_wall_minus_half_platform - platform.width / 2
   end
end

Second: the platform moves to the coursor immediately. It allows cheating: pause the game, position the coursor, continue. But I just ignore it.

Let's also add appropriate callback to launch the ball on mouse press.

function game.mousereleased( x, y, button, istouch )
   if button == 'l' or button == 1 then
      ball.launch_from_platform()
   elseif button == 'r' or button == 2 then
      music:pause()
      gamestates.set_state(
         "gamepaused",
         { ball, platform, bricks, walls, lives_display } )
   end
end

function love.mousereleased( x, y, button, istouch )
   gamestates.state_event( "mousereleased", x, y, button, istouch )
end

Transition between the gamestates is also controlled from the mouse:

function gamepaused.mousereleased( x, y, button, istouch )
   if button == 'l' or button == 1 then
      gamestates.set_state( "game" )
   elseif button == 'r' or button == 2 then
      love.event.quit()
   end   
end

Same for the "menu" and "gamefinished".