Drawing shapes
Make sure you are starting with a working pygame project, this will require you to install pygame and copy the code from the page below to make a start:
Contents
Rectangle
You can declare some variables to use for your rectangle, they require the x coordinate, the y coordinate, the width and the height:
LEFT = 100
TOP = 100
LENGTH = 20
WIDTH = 20
RECTCOORD = [LEFT, TOP, LENGTH, WIDTH]
rect1 = pygame.Rect(RECTCOORD)
This is the same as writing:
rect1 = pygame.Rect([100,100,20,20])
Colour
Before we can draw your rectangle to the screen we will need to define a colour to use:
RED = 255
YELLOW = 230
BLUE = 200
COLOR = (RED, YELLOW, BLUE)
Again this is the same as writing just:
COLOR = (255, 230, 200)
Draw the Rectangle
We can now draw the rectangle to the screen:
pygame.draw.rect(SCREEN, COLOR, rect1, 0)
The 0 will cause the shape to be filled with colour, a value above 0 will draw the outline only and use the number for the line thickness. For example:
pygame.draw.rect(SCREEN, COLOR, rect1, 1)
Update the screen
Now you have drawn something new to the screen we need to update it. We can just update a single object:
pygame.display.update(rect1)
or we can update everything:
pygame.display.update()
Full Example
#Import statements are to enable the code to use the functions from the library
import pygame
import sys
import os
#initialize pygame & window
os.environ["SDL_VIDEO_CENTERED"] = "1"
pygame.init()
SCREENWIDTH = 500
SCREENHEIGHT = 500
SCREENSIZE = [SCREENWIDTH, SCREENHEIGHT]
SCREEN = pygame.display.set_mode(SCREENSIZE)
#caption for the game
pygame.display.set_caption("My first game in pygame")
rect1 = pygame.Rect([100,100,20,20])
COLOR = (255, 0, 200)
pygame.draw.rect(SCREEN, COLOR, rect1, 1)
#game loop
while True:
pygame.display.update()
for events in pygame.event.get(): #get all pygame events
if events.type == pygame.QUIT: #if event is quit then shutdown window and program
pygame.quit()
sys.exit()
Circle
To draw a circle you need to specify the X coordinate, the Y coordinate, and the radius:
LEFT = 200
TOP = 200
RADIUS = 20
pygame.draw.circle(SCREEN, COLOR, (LEFT,TOP), RADIUS,0)
This is just the same as writing:
pygame.draw.circle(SCREEN, COLOR, (200,200), 20, 0)
The zero will produce a filled circle, any value above 0 will be used for the thickness of the outline.
Line
To draw a line you need to specify the coordinate for the starting point and the coordinate for the ending point. The thickness is the same as the other shapes drawn above:
START = [100,100]
END = [200,200]
THICK = 10;
pygame.draw.line(SCREEN, COLOR, START, END, 10)
This is the same as:
pygame.draw.line(SCREEN, COLOR, [100, 100], [200, 200], 10)