the second step

main.py

@@ -1,25 +1,70 @@
 # 基于pygame的图形化CAD编辑器
 # made by Gaoxuan
 
-import pygame, sys
+import pygame, sys, time
 from pygame.locals import *
 
-pygame.init()
-fpsClock = pygame.time.Clock()
-
-mainwindow = pygame.display.set_mode((400, 300), 0, 32)
+mainwindow = pygame.display.set_mode((1600, 900), pygame.RESIZABLE, 32)
 pygame.display.set_caption('PyCAD')
 # icon = pygame.image.load('./img/icon.png')
 # pygame.display.set_icon(icon)
 
 WHITE = (255, 255, 255)
+BLACK = (0, 0, 0)
+BLUE = (0, 0, 255)
+GREEN = (0, 255, 0)
+RED = (255, 0, 0)
+YELLOW = (225, 225, 0)
+
+pygame.init()
+fpsClock = pygame.time.Clock()
+
+bar_font_file = pygame.font.match_font('SimHei')
+bar_font = pygame.font.Font(bar_font_file, 20)
+
+menu_bar_tabs = ['文件', '编辑']
+tab_interval = 10
+
+
+def display_menu_bar_tabs():
+    tabx = tab_interval
+    for tab_text in menu_bar_tabs:
+        tab_text_surface = bar_font.render(tab_text, True, BLACK, GREEN)
+        tab_rect = tab_text_surface.get_rect()
+        tab_rect.topleft = (tabx, 8)
+        tabx = tabx + tab_rect.width + tab_interval
+        mainwindow.blit(tab_text_surface, tab_rect)
+
+
+def display_menu_bar():
+    menu_bar_rect = (0, 0, mainwindow_w, 36)
+    pygame.draw.rect(mainwindow, BLUE, menu_bar_rect)
+    display_menu_bar_tabs()
+
+
+def display_xy_status():
+    xy_status = 'x:%d y:%d' % (mouse_x, mouse_y)
+    tab_text_surface = bar_font.render(xy_status, True, BLACK, YELLOW)
+    tab_rect = tab_text_surface.get_rect()
+    tab_rect.topleft = (10, mainwindow_h - 28)
+    mainwindow.blit(tab_text_surface, tab_rect)
+
+
+def display_status_bar():
+    status_bar_rect = (0, mainwindow_h - 36, mainwindow_w, 36)
+    pygame.draw.rect(mainwindow, RED, status_bar_rect)
+    display_xy_status()
 
 
 def display_main_window():
     mainwindow.fill(WHITE)
+    display_menu_bar()
+    display_status_bar()
 
 
 while True:
+    mainwindow_w, mainwindow_h = pygame.display.get_surface().get_size()
+    mouse_x, mouse_y = pygame.mouse.get_pos()
     display_main_window()
     for event in pygame.event.get():
         if event.type == QUIT: