CODEWITHSUNDEEP
python-3.xpygamechildrensurface
Nex_Lite
Nex_Lite

Reputation: 378

how do i request the types and number of surface children in pygame?

import pygame as pg # rename pygame module with pg
import sys # application termination for some windows machines

def main():
    pg.init() #initialize pygame
    clock = pg.time.Clock() #create a time object
    fps = 30 #game frame rate
    size = [400, 400] #screen size
    bg = [255, 255, 255] #screen background

    screen = pg.display.set_mode(size)
    surface = pg.Surface(screen.get_size())

    blocks = []
    block_color = [255, 0, 0]

    def create_blocks(blocks):
        """ function will create blocks and assign a position to them"""

        block_width = 20
        block_height = 20

        # nested for loop for fast position assignment
        for i in range(0, 40, block_width):
            for j in range(0, 40, block_height):
                # offsets block objects 20px from one another
                x = 2*i
                y = 2*j

                #block rect object
                rect = pg.Rect(x, y, block_width, block_height)

                #append rect to blocks list
                blocks.append(rect)

    def draw_blocks(surface, blocks, block_color):
        """ draws blocks object to surface"""

        #loops through rects in the blocks list and draws them on surface
        for block in blocks:
            pg.draw.rect(surface, block_color, block)

    create_blocks(blocks)

    while True:
        for event in pg.event.get():
            if event.type == pg.QUIT:
                return False

        screen.blit(surface, [0, 0])
        surface.fill(bg)

        draw_blocks(surface, blocks, block_color)

        pg.display.update()
        clock.tick(fps)

    pg.quit() # closses pygame window
    sys.exit # for machines that wont accept pygame quit() event

if __name__ == '__main__':
    main()

This is a test code i made to visualize my question. What i'm asking is basically a method by which i can somehow request the types and number of children inside my surface object. For example if i had a circle, a square, a line or other type of object within my surface i want a list of all the types that are in my surface and i also want the number.

Upvotes: 1

Views: 201

Answers (1)

skrx
skrx

Reputation: 20478

Surfaces only hold information about the pixels/colors they consist of, not about the shapes that you draw on them. If you want to know how many shapes there are, you have to use lists, pygame.sprite.Groups or other data structures to store information about them.

You already have the blocks (which are pygame.Rects) in your blocks list, so you just need to call len(blocks) to get the number of blocks. You can as well use rects to store circles in a circles list.

Eventually you could create your own Shape classes or use pygame.sprite.Sprites and put instances of them into your lists/sprite groups.

Upvotes: 1

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