pygame Getting started with pygame Importing pygame and drawing on a display

Example

Getting Started

You must do the following to get started with Pygame:

import pygame

This opens a window of size 640,480, and stores it in a variable called screen.

Setting up a window name

Setting up a name for the pygame window requires the following syntax:

pygame.display.set_caption('Name')

About the screen

• The point (0,0) is at the upper left hand corner of the screen.
• x coordinates increase from left to right, y coordinates increase from top to bottom.That is the right side coordinates on the Cartesian plane is positive and left side is negative.However , the upper side coordinates on the Cartesian plane is negative on top and positive on bottom.(Note: This is considered if the points are taken from the origin.)

Updating the Screen

Changes you make to the screen—e.g. filling it with color, or drawing on it, do not show up immediately!
So how to do it?
You have to call this function:

pygame.display.update()

Colors

The coloring in pygame works on RGB mode.
The code for coloring is:

color_Name = (r,g,b)

• R stands for red.
• G stands for green
• B stands for blue.
• All three should be integers between 0 and 255, with 255 being brightest, and 0 being darkest

Drawing

1. To draw lines

   pygame.draw.lines(screen, color, closed, pointlist, thickness)
   

2. To draw rectangle

   pygame.draw.rect(screen, color, (x,y,width,height), thickness)
   

3. To draw circle

   pygame.draw.circle(screen, color, (x,y), radius, thickness)
   

Setting everything into a loop

To make a loop use the following code:

running = True
while running:
  for event in pygame.event.get():
    if event.type == pygame.QUIT:
      running = False
      pygame.quit()

Drawing a rectangle on pygame window (code)

import pygame
background_colour = (255,255,255) # White color
(width, height) = (300, 200) # Screen size
color=(0,0,0) #For retangle
screen = pygame.display.set_mode((width, height)) #Setting Screen
pygame.display.set_caption('Drawing') #Window Name
screen.fill(background_colour)#Fills white to screen
pygame.draw.rect(screen, color, (100,50,30,40), 1) #Drawing the rectangle
pygame.display.update()

#Loop
running = True
while running:
  for event in pygame.event.get():
    if event.type == pygame.QUIT:
      running = False
      pygame.quit()