tkinter

Author: furas

tkinter/__canvas__/canvas-follow-player/main.py

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+#!/usr/bin/env python3
+
+# date:2020.01.21
+# https://stackoverflow.com/questions/59805177/how-to-make-enemy-follow-player/
+
+import tkinter as tk
+import random
+
+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 on_key_press(event):
+    global player_move_x
+    global player_move_y
+    
+    if event.char == 'w':
+        player_move_y -= 5
+    if event.char == 's':
+        player_move_y += 5
+    if event.char == 'a':
+        player_move_x -= 5
+    if event.char == 'd':
+        player_move_x += 5
+        
+def on_key_release(event):
+    global player_move_x
+    global player_move_y
+    
+    if event.char == 'w':
+        player_move_y -= -5
+    if event.char == 's':
+        player_move_y += -5
+    if event.char == 'a':
+        player_move_x -= -5
+    if event.char == 'd':
+        player_move_x += -5
+
+def update_game():
+    global player_x
+    global player_y
+    global enemy_x
+    global enemy_y
+    
+    player_x += player_move_x
+    player_y += player_move_y
+    canvas.move(player_id, player_move_x, player_move_y)
+    
+    enemy_move_x, enemy_move_y = follow(player_x, player_y, enemy_x, enemy_y, enemy_speed)
+    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)
+
+# --- main ---
+
+player_x = 250
+player_y = 250
+player_move_x = 0
+player_move_y = 0
+
+enemy_x = random.randint(0, 500)
+enemy_y = random.randint(0, 500)
+enemy_speed = 5
+    
+root = tk.Tk()
+
+canvas = tk.Canvas(root, width=500, height=500, bg='gray')
+canvas.pack()
+root.bind('<KeyPress>', on_key_press)
+root.bind('<KeyRelease>', on_key_release)
+
+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()

tkinter/__other__/equation-eval-entry/main.py

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+#!/usr/bin/env python3
+
+# date: 2020.01.21
+# ???
+
+import tkinter as tk
+
+# --- functions ---
+
+def solve():
+
+    x = float(entry_x.get()) 
+    y = float(entry_y.get())
+    z = eval(equation.get())
+    z_var.set("{0:.3f}".format(z))
+
+# --- main ---
+
+root = tk.Tk()
+
+z_var = tk.StringVar()
+
+tk.Label(root, text="Equation").grid(row=0, column=0)
+equation = tk.Entry(root)
+equation.grid(row=0, column=1)
+
+tk.Label(root, text="x =").grid(row=1, column=0, sticky='e')
+entry_x = tk.Entry(root)
+entry_x.grid(row=1, column=1)
+
+tk.Label(root, text="y =").grid(row=2, column=0, sticky='e')
+entry_y = tk.Entry(root)
+entry_y.grid(row=2, column=1)
+
+tk.Label(root, text="z =").grid(row=3, column=0, sticky='e')
+tk.Label(root, textvariable=z_var, anchor='w').grid(row=3, column=1, sticky='we')
+
+button = tk.Button(root, text="Solve", command=solve)
+button.grid(row=4, column=0, columnspan=2, sticky='we')
+
+entry_x.insert('end', '3')
+entry_y.insert('end', '4')
+equation.insert('end', '(x**2 + y**2)**0.5')
+solve()
+
+root.mainloop()