From a7c200f79b0e2df2defb74276fd416070b5a2ce9 Mon Sep 17 00:00:00 2001
From: chzhang <zch921005@126.com>
Date: Sun, 6 Nov 2022 12:43:44 +0800
Subject: pygame Astar 02 event frontend backend

---
 .../02_event_frontend_backend.py"                  | 99 ++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 "path_finding/\345\244\207\350\257\276/02_event_frontend_backend.py"

(limited to 'path_finding/备课/02_event_frontend_backend.py')

diff --git "a/path_finding/\345\244\207\350\257\276/02_event_frontend_backend.py" "b/path_finding/\345\244\207\350\257\276/02_event_frontend_backend.py"
new file mode 100644
index 0000000..d3ec38d
--- /dev/null
+++ "b/path_finding/\345\244\207\350\257\276/02_event_frontend_backend.py"
@@ -0,0 +1,99 @@
+import pygame
+from pygame.locals import *
+
+WIDTH = 800
+HEIGHT = WIDTH
+
+COLS = 50
+ROWS = COLS
+
+RED = (255, 0, 0)
+GREEN = (0, 255, 0)
+BLUE = (0, 255, 0)
+YELLOW = (255, 255, 0)
+WHITE = (255, 255, 255)
+BLACK = (0, 0, 0)
+PURPLE = (128, 0, 128)
+ORANGE = (255, 165, 0)
+GREY = (128, 128, 128)
+TURQUOISE = (64, 224, 208)
+
+# spot
+spot_width = WIDTH//COLS
+spot_height = HEIGHT // ROWS
+
+win = pygame.display.set_mode((WIDTH, HEIGHT))
+pygame.display.set_caption('grid world')
+
+grid_world = []
+
+
+class Spot:
+    def __init__(self, r, c):
+        self.r = r
+        self.c = c
+        self.x = c * spot_width
+        self.y = r * spot_height
+        self.color = WHITE
+
+    def make_start(self):
+        self.color = ORANGE
+
+    def make_end(self):
+        self.color = TURQUOISE
+
+    def draw(self, win):
+        pygame.draw.rect(win, self.color, (self.x, self.y, spot_width, spot_height))
+
+
+def make_grid():
+    for r in range(ROWS):
+        grid_world.append([])
+        for c in range(COLS):
+            grid_world[r].append(Spot(r, c))
+
+
+def draw():
+    win.fill(WHITE)
+
+    for r in range(ROWS):
+        for c in range(COLS):
+            grid_world[r][c].draw(win)
+
+    for i in range(ROWS):
+        pygame.draw.line(win, GREY, (0, i*spot_height), (WIDTH, i*spot_height))
+    for j in range(COLS):
+        pygame.draw.line(win, GREY, (j*spot_width, 0), (j * spot_width, HEIGHT))
+
+    pygame.display.update()
+
+
+def map_pressed_pos(pos):
+    x, y = pos
+    return x//spot_width, y//spot_height
+
+
+if __name__ == '__main__':
+    run = True
+    start = None
+    end = None
+    make_grid()
+    while run:
+        draw()
+        for event in pygame.event.get():
+            if event.type == pygame.QUIT:
+                run = False
+            if event.type == KEYDOWN:
+                if event.key == K_ESCAPE:
+                    run = False
+            left, center, right = pygame.mouse.get_pressed()
+            if left:
+                pos = pygame.mouse.get_pos()
+                c, r = map_pressed_pos(pos)
+                spot = grid_world[r][c]
+                if not start:
+                    start = spot
+                    start.make_start()
+                elif not end:
+                    end = spot
+                    end.make_end()
-- 
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