Kivy運動問題

Question

我一直在努力解決這個問題。下面是一個kivy應用程序早期階段的python/kivy代碼。問題在於玩家運動。 Kivy過度補償了dx和dy動作，並導致玩家的動作不斷震動。我不知道如何解決這個問題。有任何想法嗎？

注意： 許多代碼是不完整的，但播放器的運動大部分完成。運動問題發生在「Player」課程中。

編輯：這裏是我的嘗試下面的帖子下面

import kivy 
kivy.require('1.1.1') 

from kivy.app import App 
from kivy.uix.widget import Widget 
from kivy.properties import ObjectProperty, ListProperty, NumericProperty 
import math 
from kivy.clock import Clock 
import time 
import random 

PLAYER_SPEED = 10 
ENEMY_SPAWN = 3 
UPDATE_SPEED = .01 
MIN_INITIAL_PLAYER_MINION_DISTANCE = 200 

class Player(Widget): 
    velocity_x = NumericProperty(0) 
    velocity_y = NumericProperty(0) 
    target = ListProperty([]) 
    speed = NumericProperty(PLAYER_SPEED) 
    def __init__(self, **kwargs): 
     Widget.__init__(self) 
     self.target = [399.0, 399.0] 
    def update_target(self, new_target): 
     self.target = new_target 
    def move(self): 
     dx = self.target[0] - self.center[0] 
     dy = self.target[1] - self.center[1] 
     x_1 = self.pos[0] - self.center[0] 
     y_1 = self.pos[1] - self.center[1] 
     total = math.sqrt(dx ** 2 + dy**2) 
     self.velocity_x = (dx/total) * self.speed 
     self.velocity_y = (dy/total) * self.speed 
     if math.sqrt(x_1** 2 + y_1**2) < self.speed: 
      self.pos = self.center 
     else: 
      new_x = self.pos[0] + self.velocity_x 
      new_y = self.pos[1] + self.velocity_y 
      self.pos = (new_x,new_y) 

class Enemy(Player): 
    velocity_y = NumericProperty(PLAYER_SPEED) 
    def __init__(self, **kwargs): 
     Widget.__init__(self) 
     self.center = kwargs.get('start_pos',[0,0]) 
    def move(self): 
     self.pos = (self.pos[0], self.pos[1] + self.velocity_y) 

def distance(widget1, widget2): 
    dist = math.sqrt((widget1.pos[0]-widget2.pos[0])**2 + \ 
        (widget1.pos[1]-widget2.pos[1])**2) 
    return dist 

class Game(Widget): 
    player1 = ObjectProperty(None) 
    enemies = ListProperty([]) 
    decoys = ListProperty([]) 
    def setup(self): 
     self.enemies = [] 
     self.decoys = [] 
     self.player1.center = self.center 
     self.setup_schedules() 
    #Don't forget about good code organization! 
    def setup_schedules(self): 
     Clock.schedule_interval(self.update, UPDATE_SPEED) 
     Clock.schedule_interval(self.spawn_enemy, ENEMY_SPAWN) 

    def update(self,dt): 
     self.player1.move() 

    def spawn_enemy(self, dt): 
     x = float(random.randint(0, self.width)) 
     y = float(random.randint(0, self.height)) 
     enemy = Enemy(start_pos = (x,y)) 
     while distance(enemy, self.player1)< MIN_INITIAL_PLAYER_MINION_DISTANCE: 
      x = float(random.randint(0, self.width)) 
      y = float(random.randint(0, self.height)) 
      enemy.pos = (x,y) 

     self.enemies.append(enemy) 
     self.add_widget(enemy) 

    def score(self): 
     zero_score = time.time() 
     player_score = zero_score + 1 


    #on_touch_move vs on_touch_down 
    def on_touch_move(self, touch): 
     self.player1.update_target([touch.x, touch.y]) 

#Entry Point into app  
class GameApp(App): 
    def build(self): 
     game = Game() 
     game.setup()   
     return game 

def main(): 
    GameApp().run() 
main() 

Answer 1

建議在你player類，並在move()，更新pos之前，你會檢查是否pos和center之間的距離小於speed。如果是，則簡單地將pos設置爲等於center。如果不是，那麼就像你已經做的那樣增加pos。