We continue working from the previous post by adding new logic to jump between blocks. It will be a simple logic.  When the player’s character jumps outside the current block. It will start looking for another block to set as the current block.

We add a new variable to keep all created blocks. 

block_list = {}

This function will start looking for the new current block when the player's character doesn't stand on the ground and stay outside the current block.

function player_find_new_current_block()
   if player.ground == false and 
      is_inside_block(player.x, player.y, current_block) == false then
         
      for b in all(block_list) do
         if is_inside_block(player.x, player.y, b) == true then
            current_block = b
            break
         end
      end
   end
end

And add this function in update()

function _update60()
   player_running()
   player_jumping()
   player_apply_gravity()
   player_find_new_current_block()
end

We will modify the current draw() to support drawing all the blocks in the “block_list” variable.

Now we have prepared variables and functions enough for making the player's character jump between the blocks. The only thing we need to do is creating new block data.

function _init()
   add(block_list, create_block(16,64,96,8))
   add(block_list, create_block(16,56,96,8))
   add(block_list, create_block(16,48,96,8))
   current_block = block_list[1]
end

player = {x=64,y=64,di=1,jump_counter=0,ground=true}
current_block = nil

block_list = {}

function create_block(x,y,w,h)
   return {x=x,y=y,w=w,h=h}
end

function draw_block(b,c)
   if (b == nil) return
   rect(b.x,b.y,b.x+b.w,b.y-b.h,c)
end

function is_inside_block(x,y,b)
   if (b == nil) return
   if x >= b.x and x < b.x + b.w then
      if y <= b.y and y > b.y - b.h then
          return true
      end
   end

   return false 
end

function player_running()
   local next_px = player.x + player.di
   if is_inside_block(player.x, player.y, current_block) == true and
      is_inside_block(next_px, player.y, current_block) == false then
      player.di = player.di * -1
      next_px = player.x + player.di
   end

   player.x = next_px
end

function player_jumping()
   if btnp(4) then
      if player.jump_counter == 0 and player.ground == true then
         player.jump_counter = 20
         player.ground = false
      end
   end
   local next_py = player.y

   if player.jump_counter > 0 then
      player.jump_counter -= 1

      if player.jump_counter > 10 then
         next_py = player.y - 1  
      else
         next_py = player.y
      end
   end

   player.y = next_py
end

function player_apply_gravity()
   local next_py = player.y
   if player.ground == false then
      if player.jump_counter <= 0 then
         next_py += 1

         if  is_inside_block(player.x, player.y, current_block) == true and 
            is_inside_block(player.x, next_py, current_block) == false then

            next_py = player.y
            player.ground = true
         end
      end
   end
   player.y = next_py
end

function player_find_new_current_block()

   if player.ground == false and 
      is_inside_block(player.x, player.y, current_block) == false then

      for b in all(block_list) do
         if is_inside_block(player.x, player.y, b) == true then
            current_block = b
            break
         end
      end
   end
end

function _init()
   add(block_list, create_block(16,64,96,8))
   add(block_list, create_block(16,56,96,8))
   add(block_list, create_block(16,48,96,8))
   current_block = block_list[1]
end

function _update60()
   player_running()
   player_jumping()
   player_apply_gravity()
   player_find_new_current_block()
end

function _draw()
   cls(0)
   print("웃", player.x-3, player.y - 5, 7)
   
   for b in all(block_list) do
      draw_block(b, 7)
   end
end