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How to create effect
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Create effect in scene module?
I created 2D shooting game. I want to add smoke effect trailing after the player.
So how can I create smoke effect and fade out after some duration.from scene import * import sound import random import math A = Action class Button(SpriteNode): def __init__(self, txt, **kwargs): SpriteNode.__init__(self, txt, **kwargs) class Laser(SpriteNode): def __init__(self, **kwargs): SpriteNode.__init__(self, 'spc:LaserBlue9', **kwargs) class Enemy(SpriteNode): def __init__(self, **kwargs): img = random.choice(['spc:EnemyBlack1', 'spc:EnemyBlue2', 'spc:EnemyGreen5']) SpriteNode.__init__(self, img, **kwargs) class MyScene (Scene): def setup(self): x = get_screen_size() self.laser_on_screen = []; self.touched = ''; self.touch_id_locations = {}; self.ship_orient = 'up' self.enemy_list = [] bg = Node(parent=self) for x in range(int(self.size.w/ 128) + 1): for y in range(int(self.size.h / 128) + 1): tile = SpriteNode(Texture('spc:BackgroundPurple'), position = (x * 128, y * 128)); bg.add_child(tile) self.player = SpriteNode(Texture('spc:PlayerShip1Blue'), position = (self.size.w / 2, self.size.h / 2)) self.add_child(self.player) self.button_down = Button('iob:arrow_down_a_256', scale= 0.5);self.button_down.position = (180, 120); self.add_child(self.button_down) self.button_up = Button('iob:arrow_up_a_256', scale= 0.5);self.button_up.position = (180, 280); self.add_child(self.button_up) self.button_left = Button('iob:arrow_left_a_256', scale= 0.5);self.button_left.position = (100, 200); self.add_child(self.button_left) self.button_right = Button('iob:arrow_right_a_256', scale= 0.5);self.button_right.position = (260, 200); self.add_child(self.button_right) self.button_shoot = Button('iob:ios7_circle_filled_256', scale= 0.5);self.button_shoot.position = (self.size.w - 180, 200); self.add_child(self.button_shoot) def did_change_size(self): pass def update(self): speed = 5 self.laser_position_orientation = { 'up': ((self.player.position.x, self.player.position.y + 32), 0, 2000, 0.0), 'down': ((self.player.position.x, self.player.position.y - 32), 0, -2000, 3.14159), 'right': ((self.player.position.x + 32, self.player.position.y), 2000, 0, 4.71239), 'left': ((self.player.position.x - 32, self.player.position.y), -2000, 0, 1.5708), } for location in self.touch_id_locations.values(): if location in self.button_up.frame: self.ship_orient = 'up' self.player.position = (self.player.position.x, self.player.position.y + speed) self.player.rotation = 0.0 if location in self.button_down.frame: self.ship_orient = 'down' self.player.position = (self.player.position.x, self.player.position.y - speed) self.player.rotation = 3.14159 if location in self.button_left.frame: self.ship_orient = 'left' self.player.position = (self.player.position.x - speed, self.player.position.y) self.player.rotation = 1.5708 if location in self.button_right.frame: self.ship_orient = 'right' self.player.position = (self.player.position.x + speed, self.player.position.y) self.player.rotation = 4.71239 for laser in self.laser_on_screen: if laser.position.x > self.size.w or laser.position.x < 0 or laser.position.y > self.size.h or laser.position.y < 0: laser.remove_from_parent() self.laser_on_screen.remove(laser) if random.random() < 0.0055: self.spawn_enemy() self.check_laser_collision() def touch_began(self, touch): self.touch_id_locations[touch.touch_id] = touch.location if touch.location in self.button_shoot.frame: laser_data_pack = self.laser_position_orientation.get(self.ship_orient) sound.play_effect('digital:Laser1') self.touch_id_locations.pop(touch.touch_id) self.laser = Laser() self.laser.position = laser_data_pack[0]; self.add_child(self.laser); self.laser.rotation = laser_data_pack[3] self.laser_on_screen.append(self.laser) self.laser.run_action(Action.sequence(Action.move_by(laser_data_pack[1], laser_data_pack[2]))) def touch_moved(self, touch): pass def touch_ended(self, touch): try: self.touch_id_locations.pop(touch.touch_id) except KeyError: pass def get_key(self, val): for key, value in self.touch_id_locations.items(): if val == value: return key def spawn_enemy(self): enemy_position = (random.randint(0, self.size.w - 1), random.randint(0, self.size.h)) self.enemy = Enemy(); self.enemy.position = enemy_position; self.add_child(self.enemy) self.enemy_list.append(self.enemy) def check_laser_collision(self): for laser in self.laser_on_screen: for enemy in self.enemy_list: if laser.position in enemy.frame: enemy.remove_from_parent() laser.remove_from_parent() self.enemy_list.remove(enemy) try: self.laser_on_screen.remove(laser) except ValueError: pass sound.play_effect('arcade:Explosion_2') if __name__ == '__main__': run(MyScene(),DEFAULT_ORIENTATION,show_fps=False, multi_touch = True) ``` -
@Tonnoaw perhaps with Shader
A = Action # RIPPLE GLSL shader program ripple_shader1 = ''' precision highp float; varying vec2 v_tex_coord; // texture coordinate // These uniforms are set automatically: uniform sampler2D u_texture; // input image uniform float u_time; // timer uniform vec2 u_sprite_size; // This uniform is set in response to touch events: uniform vec2 u_offset; void main(void) { vec2 p = -1.0 + 2.0 * v_tex_coord + (u_offset / u_sprite_size * 2.0); float len = length(p); vec2 uv = v_tex_coord + (p/len) * 1.5 * cos(len*50.0 - u_time*10.0) * 0.03; gl_FragColor = texture2D(u_texture,uv); // fragment shader color } ''' . . . self.laser.run_action(Action.sequence(Action.move_by(laser_data_pack[1], laser_data_pack[2]))) self.player.shader = Shader(ripple_shader1) ui.delay(self.fade_out,2) def fade_out(self): self.player.shader = None . . . -
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Docs said:
Note that Scene is a subclass of EffectNode, so you can use a custom Shader for full-scene post-processing effects. Unlike a vanilla EffectNode however, a scene’s effects_enabled attribute is set to False by default.
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Thanks guys, I will study about shader and effect more Thanks!
