Thanks Diarandor! I am having a slight issue though, and I think you may have had something similar and don't recall how you fixed it. After the enemy jumps, the shadow is not being removed and the enemy remains invincible. Everything works fine up to this point, so I'm guessing it's something to do with a timer? Here's my version of the code:
local enemy = ...
-- Tektite: a jumping enemy which moves toward the hero.
local state -- States: "stopped", "going_hero", "jumping", "prepare_jump", "finish_jump", "going_random"
local speed = 20
local detection_distance = 80
local jump_duration = 1000 -- Time in milliseconds.
local max_height = 24 -- Height for the jump, in pixels.
local jumping_speed = 100 -- Speed of the movement during the jump.
function enemy:on_created()
self:set_life(3); self:set_damage(4)
self:create_sprite("enemies/tektite_blue")
self:set_size(16, 16); self:set_origin(8, 13)
self:set_hurt_style("monster")
self:set_pushed_back_when_hurt(true)
self:set_push_hero_on_sword(false)
function sprite:on_animation_finished(animation)
if animation == "immobilized" then -- state: finish_jump
state = "stopped"
sprite:set_animation("stopped")
sol.timer.start(self, 200, function()
enemy:go_hero()
end)
end
end
end
function enemy:on_restarted()
is_pushing_enemy = false
self:check_hero()
end
function enemy:go_hero()
state = "going_hero"
self:get_sprite():set_animation("walking")
local m = sol.movement.create("target")
m:set_speed(speed)
m:set_target(self:get_map():get_hero())
m:start(self)
-- Prepare jump.
sol.timer.start(self, 1500, function()
self:prepare_jump()
end)
end
function enemy:prepare_jump()
state = "prepare_jump"
self:stop_movement()
self:get_sprite():set_animation("shaking")
sol.timer.start(self, 2000, function()
enemy:jump()
end)
end
function enemy:finish_jump()
state = "finish_jump"
self:stop_movement()
self:get_sprite():set_animation("immobilized")
self:set_can_attack(true) -- Allow to attack the hero again.
end
function enemy:jump()
-- Set jumping state, animation and sound.
state = "jumping"
local sprite = self:get_sprite()
sprite:set_animation("walking")
sol.audio.play_sound("jump")
self:set_invincible(true) -- Set invincible.
self:set_can_attack(false) -- Do not attack hero during jump.
-- Start shift on sprite.
local function f(t) -- Shifting function.
return math.floor(4 * max_height * (t / jump_duration - (t / jump_duration) ^ 2))
end
local t = 0
local refreshing_time = 10
sol.timer.start(self, refreshing_time, function() -- Update shift each 10 milliseconds.
sprite:set_xy(0, -f(t))
t = t + refreshing_time
if t > jump_duration then return false
else return true
end
end)
-- Add a shadow sprite.
local shadow = self:create_sprite("entities/shadow")
shadow:set_animation("big")
local new_frame_delay = math.floor(jump_duration/shadow:get_num_frames())
shadow:set_frame_delay(new_frame_delay)
-- Add movement towards near the hero during the jump. The jump does not target the hero.
-- The angle is partially random to avoid too many enemies overlapping.
local m = sol.movement.create("straight")
local angle = self:get_angle(self:get_map():get_hero())
math.randomseed(os.time()) -- Initialize random seed.
local d = 2*math.random() - 1 -- Random real number in [-1,1].
angle = angle + d*math.pi/4 -- Alter jumping angle, randomly.
m:set_speed(jumping_speed)
m:set_angle(angle)
m:start(self)
-- Finish the jump.
sol.timer.start(self, jump_duration, function()
self:remove_sprite(shadow) -- Remove shadow sprite.
sol.timer.start(self, 1, function() -- TODO: remove this after #868 is fixed.
self:set_default_attack_consequences() -- Stop invincibility after jump.
self:finish_jump()
end)
end)
end
function enemy:on_movement_changed(movement)
local direction4 = movement:get_direction4()
local sprite = self:get_sprite()
sprite:set_direction(direction4)
end
function enemy:on_obstacle_reached(movement)
if not going_hero then
self:go_random()
self:check_hero()
end
end
function enemy:on_hurt()
if timer ~= nil then
timer:stop()
timer = nil
end
end
function enemy:check_hero()
local hero = self:get_map():get_entity("hero")
local _, _, layer = self:get_position()
local _, _, hero_layer = hero:get_position()
local near_hero = layer == hero_layer and self:get_distance(hero) < 100
if near_hero and state ~= "going_hero" then
self:go_hero()
elseif not near_hero and state == "going_hero" then
self:go_random()
end
timer = sol.timer.start(self, 2000, function() self:check_hero() end)
end
function enemy:go_random()
state = "going_random"
sol.timer.start(self, 2000, function() self:check_hero() end)
end
