python - 在 Pygame 中旋转图像时图像质量不佳

Question

我的第一个 Pygame 程序，它是一个使用来自 python-obd 的 rpm 数据的虚拟转速计。我每次都通过原始图像进行旋转，但仍然会在 0、90、180 等角度以外的角度出现失真。我错过了什么吗？* 针图像围绕中心旋转，一半是透明的。

import pygame
from pygame.locals import *
import time
from buttonClass import *
import obd
obd.logger.setLevel(obd.logging.DEBUG)
connection = obd.Async("\\.\\COM3")
pygame.init()
screen = pygame.display.set_mode((800,480))
pygame.display.set_caption('Virtual Dash')

rpm = 0

def rpm_gauge():
    gauge_image = pygame.image.load(r"C:\Users\olinr\CS121\gaugecrop.jpg")
    rpm_gauge = pygame.transform.scale(gauge_image, (281,280))
    return rpm_gauge
def gauge_needle():
    needle_image = pygame.image.load(r"C:\Users\olinr\CS121\needtransp.png")
    needle = pygame.transform.scale(needle_image, (270, 4))
    #needle.set_colorkey((0,0,0))
    return needle
# def rotate_needle(needle, angle):
#     rotated_needle = pygame.transform.rotate(needle, angle)
#     return rotated_needle

def get_rpm(r):
    global rpm
    if not r.is_null():
        rpm = int(r.value.magnitude)
def update_fps():
    fps = str(int(clock.get_fps()))
    fps_text = font.render(fps + " fps", 1, pygame.Color("coral"))
    return fps_text

pivot = (340, 336.5)
run = True
clock = pygame.time.Clock()
connection.watch(obd.commands.RPM, callback=get_rpm)
connection.start()
angle = 0
while run:
    screen.fill(black)
    gauge = rpm_gauge()
    angle = 36 * (rpm * -.001) + 90
    needle_rotated = pygame.transform.rotate(gauge_needle(), angle)
    screen.blit(gauge, (260,200))
    screen.blit(needle_rotated, (400 - int(needle_rotated.get_width() / 2), 336 - 
    int(needle_rotated.get_height() / 2)))
    screen.blit(update_fps(), (0, 350))
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False
    #clock.tick(120)
    #rpm += 70
    pygame.display.update()
    pygame.display.flip()

pygame.quit()

标签： pythonpygameimage-rotation