import pygame
from pygame.locals import *
import math
pygame.init()
screen = pygame.display.set_mode((480,360))
screenrect = screen.get_rect()
pygame.display.set_caption("pygame箭头类_朝向鼠标指针_作者:李兴球")
class Arrow():
"""箭头类,移动方式为朝向自己的方向移动"""
def __init__(self, position,heading ):
self.image=pygame.Surface((36,24))
pointlist=[(0,7),(20,7),(20,0),(36,12),(20,24),(20,17),(0,17)]
pygame.draw.polygon(self.image,(255,255,255),pointlist)
self.image_rotated = self.image
self.rect = self.image.get_rect()
#self.w, self.h = self.rect.width,self.rect.height
self.rect.centerx ,self.rect.centery = position
self.heading = heading
def forward(self,distance):
angle = math.radians(self.heading) #把角度变为弧度
(dx,dy) = (10*distance*math.cos(angle),-10*distance*math.sin(angle))
#self.rect.move_ip(dx,dy)
self.rect.x = 100* self.rect.x + 100* dx
self.rect.y = 100* self.rect.y + 100* dy
self.rect.x = self.rect.x /100
self.rect.y = self.rect.y /100
def turn(self,angle):
self.heading = self.heading - angle
self.heading = self.heading % 360
self.setheading(self.heading)
def setheading(self,heading):
self.heading = heading
self.image_rotated = pygame.transform.rotate(self.image,self.heading) #旋转到某个方向
self.rect.width, self.rect.height = self.image_rotated.get_size()
def draw(self):
"""在中心点绘制箭头"""
screen.blit(self.image_rotated,(self.rect.x - self.rect.width//2,self.rect.y - self.rect.height//2))
def headingpoint(self,x,y):
heading = math.atan2((x-self.rect.x),(y - self.rect.y))
heading= math.degrees(heading) - 90
print(heading)
self.setheading(heading)
def main():
clock = pygame.time.Clock()
arrow = Arrow((screenrect.centerx,screenrect.centery),0)
while True:
for event in pygame.event.get():
if event.type == QUIT:
pygame.quit()
mx,my = pygame.mouse.get_pos()
arrow.headingpoint(mx,my)
screen.fill((0,0,0))
arrow.draw()
pygame.display.update()
clock.tick(30)
if __name__=="__main__":
main()