PicoPuzzlePlatformer/jump_statemachine.lua at main · NeilConnatty/PicoPuzzlePlatformer · GitHub

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jump_states = {
    jumping = 0,
    decelerate = 1,
    falling = 2,
    rising = 3,
    grounded = 4
}

local max_jump_frames = 15
local curr_jump_frames = 0
local max_decel_frames = 10
local curr_decel_frames = 0

function is_player_grounded()
    local map_flag_1 = fget(mget(player.x, player.y+1))
    local map_flag_2 = fget(mget(player.x+1, player.y+1))
    local player_flag = fget(player.sprite)
    return map_flag_1 == player_flag or map_flag_2 == player_flag
end

function is_player_inside_wall()
    local map_flag_1 = fget(mget(player.x, player.y+0.875))
    local map_flag_2 = fget(mget(player.x+0.875, player.y+0.875))
    local map_flag_3 = fget(mget(player.x, player.y))
    local map_flag_4 = fget(mget(player.x+0.875, player.y))
    local player_flag = fget(player.sprite)
    return map_flag_1 == player_flag or map_flag_2 == player_flag or map_flag_3 == player_flag or map_flag_4 == player_flag
end

function advance_state_machine()
    if is_player_inside_wall() then
        player.jump_state = jump_states.rising
    end

    if (player.jump_state == jump_states.grounded) then
        if (btnp(button.x)) then
            player.jump_state = jump_states.jumping
            curr_jump_frames = max_jump_frames
        elseif not is_player_grounded() then
            player.jump_state = jump_states.falling
        end
    elseif (player.jump_state == jump_states.jumping) then
        if (curr_jump_frames > 0) and btn(button.x) then
            curr_jump_frames -= 1
        else
            player.jump_state = jump_states.decelerate
            curr_decel_frames = max_decel_frames
        end
    elseif (player.jump_state == jump_states.decelerate) then
        if is_player_grounded() then
            player.jump_state = jump_states.grounded
        elseif (curr_decel_frames > 0) then
            curr_decel_frames -= 1
        else
            player.jump_state = jump_states.falling
        end
    elseif (player.jump_state == jump_states.falling) then
        if is_player_grounded() then
            player.jump_state = jump_states.grounded
        end
    elseif (player.jump_state == jump_states.rising) then
        if not is_player_inside_wall() then
            if is_player_grounded() then
                player.jump_state = jump_states.grounded
            else
                player.jump_state = jump_states.falling
            end
        end
    end
end

function get_new_y()
    if (player.jump_state == jump_states.falling) then
        return player.y + player.speed
    elseif (player.jump_state == jump_states.jumping or player.jump_state == jump_states.rising) then
        return player.y - player.speed
    elseif (player.jump_state == jump_states.decelerate) then
        return player.y + (player.speed * ((max_decel_frames - curr_decel_frames) / max_decel_frames))
    else
        return player.y
    end
end