Array-Backed Grid

If you work with grids much, you’ll find this to be slow. You may want to look at:
Array-Backed Grid Buffered - faster and uses buffered shapes
Grid Using Sprites v1 - super-fast and uses sprites. Resyncs to number grid in one function call
Grid Using Sprites v2 super-fast and uses sprites. Keeps a second 2D grid of sprites to match 2D grid of numbers
array_backed_grid.py
1"""
2Array Backed Grid
3
4Show how to use a two-dimensional list/array to back the display of a
5grid on-screen.
6
7Note: Regular drawing commands are slow. Particularly when drawing a lot of
8items, like the rectangles in this example.
9
10For faster drawing, create the shapes and then draw them as a batch.
11See array_backed_grid_buffered.py
12
13If Python and Arcade are installed, this example can be run from the command line with:
14python -m arcade.examples.array_backed_grid
15"""
16import arcade
17
18# Set how many rows and columns we will have
19ROW_COUNT = 15
20COLUMN_COUNT = 15
21
22# This sets the WIDTH and HEIGHT of each grid location
23WIDTH = 30
24HEIGHT = 30
25
26# This sets the margin between each cell
27# and on the edges of the screen.
28MARGIN = 5
29
30# Do the math to figure out our screen dimensions
31WINDOW_WIDTH = (WIDTH + MARGIN) * COLUMN_COUNT + MARGIN
32WINDOW_HEIGHT = (HEIGHT + MARGIN) * ROW_COUNT + MARGIN
33WINDOW_TITLE = "Array Backed Grid Example"
34
35
36class GameView(arcade.View):
37 """
38 Main application class.
39 """
40
41 def __init__(self):
42 """
43 Set up the application.
44 """
45
46 super().__init__()
47
48 # Create a 2 dimensional array. A two-dimensional
49 # array is simply a list of lists.
50 self.grid = []
51 for row in range(ROW_COUNT):
52 # Add an empty array that will hold each cell
53 # in this row
54 self.grid.append([])
55 for column in range(COLUMN_COUNT):
56 self.grid[row].append(0) # Append a cell
57
58 self.background_color = arcade.color.BLACK
59
60 def on_draw(self):
61 """
62 Render the screen.
63 """
64
65 # This command has to happen before we start drawing
66 self.clear()
67
68 # Draw the grid
69 for row in range(ROW_COUNT):
70 for column in range(COLUMN_COUNT):
71 # Figure out what color to draw the box
72 if self.grid[row][column] == 1:
73 color = arcade.color.GREEN
74 else:
75 color = arcade.color.WHITE
76
77 # Do the math to figure out where the box is
78 x = (MARGIN + WIDTH) * column + MARGIN + WIDTH // 2
79 y = (MARGIN + HEIGHT) * row + MARGIN + HEIGHT // 2
80
81 # Draw the box
82 arcade.draw_rect_filled(arcade.rect.XYWH(x, y, WIDTH, HEIGHT), color)
83
84 def on_mouse_press(self, x, y, button, modifiers):
85 """
86 Called when the user presses a mouse button.
87 """
88
89 # Change the x/y screen coordinates to grid coordinates
90 column = int(x // (WIDTH + MARGIN))
91 row = int(y // (HEIGHT + MARGIN))
92
93 print(f"Click coordinates: ({x}, {y}). Grid coordinates: ({row}, {column})")
94
95 # Make sure we are on-grid. It is possible to click in the upper right
96 # corner in the margin and go to a grid location that doesn't exist
97 if row < ROW_COUNT and column < COLUMN_COUNT:
98
99 # Flip the location between 1 and 0.
100 if self.grid[row][column] == 0:
101 self.grid[row][column] = 1
102 else:
103 self.grid[row][column] = 0
104
105
106def main():
107 """ Main function """
108 # Create a window class. This is what actually shows up on screen
109 window = arcade.Window(WINDOW_WIDTH, WINDOW_HEIGHT, WINDOW_TITLE)
110
111 # Create the GameView
112 game = GameView()
113
114 # Show GameView on screen
115 window.show_view(game)
116
117 # Start the arcade game loop
118 arcade.run()
119
120
121if __name__ == "__main__":
122 main()