我已经面临一个问题两周了,但我仍然不知道从哪里开始。问题在于创建一个关于两个点相互追逐的曲率动画。其中一个在 x 轴上沿直线移动,另一个从 x 轴向下开始(在 y 轴上,例如 p(0:-10)),根据追逐原理,第二个尝试不断面对第一个并捕获它。我编写了一些代码来帮助我获得实际答案,但我无法以非常宝贵的方式将其可视化。我使用 python 作为我的主要编码语言。
提前谢谢您 卢卡·K.
最佳答案
看起来像enemy following player
上周被要求 tkinter
和pygame
计算对象之间的向量
diff_x = player_x - enemy_x
diff_y = player_y - enemy_y
和距离
distance = (diff_x**2 + diff_y**2)**0.5 # Pythagoras: a**2 + b**2 = c**2
计算归一化向量(长度为 1
的向量)
normal_x = diff_x/distance
normal_y = diff_y/distance
你可以乘以speed
计算move_x
和move_y
对于 enemy
enemy_move_x = enemy_speed * normal_x
enemy_move_y = enemy_speed * normal_y
你可以用它来移动enemy
并画线。
要绘制它,您可以使用不同的模块 - 任何 GUI 框架,如 tkinter
, PyQt
, wxPython
或游戏/媒体库,如 pygame
或pyglet
。最终您可以生成可用于创建动画 GIF 的图像。
import tkinter as tk
def follow(player_x, player_y, enemy_x, enemy_y, enemy_speed=5):
diff_x = player_x - enemy_x
diff_y = player_y - enemy_y
distance = (diff_x**2 + diff_y**2)**0.5 # Pythagoras: a**2 + b**2 = c**2
if distance <= enemy_speed:
return diff_x, diff_y
normal_x = diff_x/distance
normal_y = diff_y/distance
enemy_move_x = enemy_speed * normal_x
enemy_move_y = enemy_speed * normal_y
return enemy_move_x, enemy_move_y
def update_game():
global player_x
global player_y
global enemy_x
global enemy_y
# draw line for player
canvas.create_line(player_x, player_y, player_x+player_move_x, player_y+player_move_y, fill='green')
# move player
player_x += player_move_x
player_y += player_move_y
canvas.move(player_id, player_move_x, player_move_y)
# calculate move for enemy
enemy_move_x, enemy_move_y = follow(player_x, player_y, enemy_x, enemy_y, enemy_speed)
# draw line for enemy
canvas.create_line(enemy_x, enemy_y, enemy_x+enemy_move_x, enemy_y+enemy_move_y, fill='red')
# move enemy
enemy_x += enemy_move_x
enemy_y += enemy_move_y
canvas.move(enemy_id, enemy_move_x, enemy_move_y)
root.after(100, update_game) # repeate after 100ms (0.1s)
# --- main ---
# player start position and move ("speed")
player_x = 5
player_y = 50
player_move_x = 4
player_move_y = 0 # try for `1`
# enemy start position and speed
enemy_x = 5
enemy_y = 500
enemy_speed = 5
root = tk.Tk()
canvas = tk.Canvas(root, width=750, height=500)#, bg='gray')
canvas.pack()
player_id = canvas.create_oval(player_x-5, player_y-5, player_x+5, player_y+5, fill='green')
enemy_id = canvas.create_oval(enemy_x-5, enemy_y-5, enemy_x+5, enemy_y+5, fill='red')
update_game()
root.mainloop()
<小时/>
顺便说一句:回答问题How to make enemy follow player你有相同的代码,但你必须使用键 WASD
移动玩家而且它不画线。
关于python - 在Python中创建曲率动画,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59836541/