CODEWITHSUNDEEP
pythonpython-3.xpygame
user4333465
user4333465

Reputation:

Drawing Semi-Circles in Pygame

Is there a way to draw a semicircle in Pygame? Something like this:

semicircle

pygame.surface.set_clip() will not work for this - I need circles that look like pie slices as well, like this one:

pie slice

Upvotes: 3

Views: 8132

Answers (2)

Abhishek
Abhishek

Reputation: 31

import pygame
from math import sin,cos,radians

#function to draw pie using parametric coordinates of circle
def pie(scr,color,center,radius,start_angle,stop_angle):
    theta=start_angle
    while theta <= stop_angle:
        pygame.draw.line(scr,color,center, 
        (center[0]+radius*cos(radians(theta)),center[1]+radius*sin(radians(theta))),2)
        theta+=0.01

#for example:-
if __name__=="__main__":
    winWidth,winHeight=500,500
    scr=pygame.display.set_mode((winWidth,winHeight))
    pie(scr,(255,0,0),(winWidth//2,winHeight//2),250,0,60)
    pygame.display.update()

this is result of this example

The way this code solves the issue is by rotating a line of width 2 around a circle so that the overlap between any two lines doesn't leave a gap

The real life analogy would be to think about a thick clock hand moving around a clock and taking pictures of it so that when you overlay the images you get a filled in sector of a circle.

Upvotes: 3

furas
furas

Reputation: 143207

PyGame has no function to create filled arc/pie but you can use PIL/pillow to generate bitmap with pieslice and convert to PyGame image to display it.

import pygame
#import pygame.gfxdraw
from PIL import Image, ImageDraw

# --- constants ---

BLACK = (  0,   0,   0)
WHITE = (255, 255, 255)
BLUE  = (  0,   0, 255)
GREEN = (  0, 255,   0)
RED   = (255,   0,   0)
GREY  = (128, 128, 128)

#PI = 3.1415

# --- main ----

pygame.init()
screen = pygame.display.set_mode((800,600))

# - generate PIL image with transparent background -

pil_size = 300

pil_image = Image.new("RGBA", (pil_size, pil_size))
pil_draw = ImageDraw.Draw(pil_image)
#pil_draw.arc((0, 0, pil_size-1, pil_size-1), 0, 270, fill=RED)
pil_draw.pieslice((0, 0, pil_size-1, pil_size-1), 330, 0, fill=GREY)

# - convert into PyGame image -

mode = pil_image.mode
size = pil_image.size
data = pil_image.tobytes()

image = pygame.image.fromstring(data, size, mode)

image_rect = image.get_rect(center=screen.get_rect().center)

# - mainloop -

clock = pygame.time.Clock()
running = True

while running:

    clock.tick(10)

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_ESCAPE:
                running = False

    screen.fill(WHITE)
    #pygame.draw.arc(screen, BLACK, (300, 200, 200, 200), 0, PI/2, 1)
    #pygame.gfxdraw.pie(screen, 400, 300, 100, 0, 90, RED)
    #pygame.gfxdraw.arc(screen, 400, 300, 100, 90, 180, GREEN)

    screen.blit(image, image_rect) # <- display image

    pygame.display.flip()

# - end -

pygame.quit()

Result:

enter image description here

GitHub: furas/python-examples/pygame/pillow-image-pieslice

Upvotes: 3

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