112 lines
3.1 KiB
Python
112 lines
3.1 KiB
Python
"""
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Array Backed Grid
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Show how to use a two-dimensional list/array to back the display of a
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grid on-screen.
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If Python and Arcade are installed, this example can be run from the command line with:
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python -m arcade.examples.array_backed_grid_buffered
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"""
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import arcade
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# Set how many rows and columns we will have
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ROW_COUNT = 15
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COLUMN_COUNT = 15
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# This sets the WIDTH and HEIGHT of each grid location
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WIDTH = 30
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HEIGHT = 30
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# This sets the margin between each cell
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# and on the edges of the screen.
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MARGIN = 5
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# Do the math to figure out our screen dimensions
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SCREEN_WIDTH = (WIDTH + MARGIN) * COLUMN_COUNT + MARGIN
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SCREEN_HEIGHT = (HEIGHT + MARGIN) * ROW_COUNT + MARGIN
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SCREEN_TITLE = "Array Backed Grid Buffered Example"
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class MyGame(arcade.Window):
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"""
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Main application class.
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"""
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def __init__(self, width, height, title):
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"""
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Set up the application.
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"""
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super().__init__(width, height, title)
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self.shape_list = None
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# Create a 2 dimensional array. A two dimensional
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# array is simply a list of lists.
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self.grid = []
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for row in range(ROW_COUNT):
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# Add an empty array that will hold each cell
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# in this row
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self.grid.append([])
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for column in range(COLUMN_COUNT):
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self.grid[row].append(0) # Append a cell
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arcade.set_background_color(arcade.color.BLACK)
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self.recreate_grid()
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def recreate_grid(self):
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self.shape_list = arcade.ShapeElementList()
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for row in range(ROW_COUNT):
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for column in range(COLUMN_COUNT):
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if self.grid[row][column] == 0:
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color = arcade.color.WHITE
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else:
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color = arcade.color.GREEN
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x = (MARGIN + WIDTH) * column + MARGIN + WIDTH // 2
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y = (MARGIN + HEIGHT) * row + MARGIN + HEIGHT // 2
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current_rect = arcade.create_rectangle_filled(x, y, WIDTH, HEIGHT, color)
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self.shape_list.append(current_rect)
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def on_draw(self):
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"""
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Render the screen.
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"""
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# This command has to happen before we start drawing
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arcade.start_render()
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self.shape_list.draw()
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def on_mouse_press(self, x, y, button, modifiers):
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"""
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Called when the user presses a mouse button.
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"""
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# Change the x/y screen coordinates to grid coordinates
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column = x // (WIDTH + MARGIN)
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row = y // (HEIGHT + MARGIN)
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print(f"Click coordinates: ({x}, {y}). Grid coordinates: ({row}, {column})")
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# Make sure we are on-grid. It is possible to click in the upper right
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# corner in the margin and go to a grid location that doesn't exist
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if row < ROW_COUNT and column < COLUMN_COUNT:
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# Flip the location between 1 and 0.
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if self.grid[row][column] == 0:
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self.grid[row][column] = 1
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else:
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self.grid[row][column] = 0
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self.recreate_grid()
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def main():
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MyGame(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
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arcade.run()
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if __name__ == "__main__":
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main()
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