Detailed explanation of PyGame graphics drawing function

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five graphics

In addition to straight lines, pygame provides a variety of graphics drawing functions. In addition to the necessary drawing window, color and line width placed at the end, their parameters are as shown in the following table

function	graphics	Parameter Type
rect	rectangle	Rect
ellipse	oval	Rect
arc	elliptical arc	Rect, st, ed
circle	round	center, radius
polygon	polygon	points

It can be seen from the parameter categories that the drawing logic of rectangles and ellipses is consistent. It can be understood that the ellipse created with rectangular constraints is the inscribed ellipse of the rectangle; and the elliptical arc is nothing more than an additional starting and ending angle.

This is not the case with circles and polygons, where the former is based on a center and radius, and the latter is based on a set of points. The following focuses on showing the basic usage of these drawing functions.

import pygame
from pygame.draw import *

pygame.init()
screen = pygame.display.set_mode((640, 360))

pts = [(400, 0), (450, 100), (500, 0), (600, 100),
       (620, 300), (450, 350)]
while True:
    if pygame.QUIT in [e.type for e in pygame.event.get()]:
        pygame.quit()
        break
    screen.fill("purple")
    rect(screen, "green", pygame.Rect(10, 30, 100, 300))
    ellipse(screen, "red", pygame.Rect(120, 30, 100, 300))
    arc(screen, "black", pygame.Rect(230, 30, 100, 300), 0, 4.5)
    circle(screen, "blue", pygame.Vector2(360, 180), 40)
    polygon(screen, "pink", pts)
    pygame.display.flip()

The effect is as follows

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rectangle

Rectangle is a very basic graphic in pygame, and there are many usage scenarios. Its advantage is that it can very conveniently determine whether two objects collide. Its complete parameter list is as follows

rect(surface, color, rect, width=0, border_radius=0, border_top_left_radius=-1, border_top_right_radius=-1, border_bottom_left_radius=-1, border_bottom_right_radius=-1)

Among them, the five additional parameters ending with radius can be used to set the rounded corners of the rectangle. Examples are as follows

pygame.init()
screen = pygame.display.set_mode((640, 360))
while True:
    if pygame.QUIT in [e.type for e in pygame.event.get()]:
        pygame.quit()
        break
    screen.fill("purple")
    rect(screen, "green", pygame.Rect(50, 30, 200, 300), border_radius=10)
    rect(screen, "red", pygame.Rect(280, 30, 300, 300),
    border_top_left_radius=10, border_top_right_radius=40, border_bottom_left_radius=80, border_bottom_right_radius=160)
    pygame.display.flip()

The effect is as follows

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round

Circles are similar to rectangles. In addition to basic drawing parameters, 4 customizable parameters are also provided.

circle(surface, color, center, radius, width=0, draw_top_right=None, draw_top_left=None, draw_bottom_left=None, draw_bottom_right=None)

These four parameters are all of Boolean type and are used to control the four corners of the circle. If none are specified, there will be no effect. If one of the parameters is specified as True, only a quarter arc in this direction will be drawn. The example is as follows.

pygame.init()
screen = pygame.display.set_mode((640, 360))
while True:
    if pygame.QUIT in [e.type for e in pygame.event.get()]:
        pygame.quit()
        break
    screen.fill("purple")
    circle(screen, (1, 136, 225), pygame.Vector2(320, 180), 150,
        draw_top_left=True, draw_bottom_right=True)
    circle(screen, "white", pygame.Vector2(320, 180), 150,
        draw_top_right=True, draw_bottom_left=True)
    pygame.display.flip()

Insert image description here