"""本程序定义一个笔类,它有forward方法,能朝自己的方向前进,但是有误差!
然后用这支笔画了一个彩色的圆盘.笔的x,y坐标是数学坐标系(scratch类的舞台坐标系)，非计算机屏幕的x朝右为正，y朝下为正这个坐标系。
"""
import pygame
from pygame.locals import *
import math
import colorsys
pygame.init()
screenWidth,screenHeight=800,600
screenCenterx,screenCentery = screenWidth//2 -1 ,screenHeight//2 - 1
screen = pygame.display.set_mode((screenWidth,screenHeight))
pygame.display.set_caption("pygame笔类画的彩色圆盘_作者:李兴球")
class Pen():
def __init__(self,color,thickness):
self.image = pygame.Surface((12,12))
pygame.draw.circle(self.image,color,(6,6),6)
pygame.display.update()
self.rect = self.image.get_rect()
self.color = color #笔颜色
self.thickness = thickness #笔迹宽度
self.rect.centerx = screenCenterx
self.rect.centery = screenCentery
self.heading = 0 #朝向,是与新y轴的夹角
self.status = 0 #0表示抬笔,1表示落笔
self.visible = 1 #0表示隐藏笔,1表示显示笔(就是那个小点)
def down(self):
self.status = 1
def up(self):
self.status = 0
def show(self):
self.visible = 1
def hide(self):
self.visible = 0
def drawaxis(self):
"""画x轴和y轴"""
pygame.draw.line(screen,(255,255,255),(0,screenCentery),(screenWidth,screenCentery))
pygame.draw.line(screen,(255,255,255),(screenCenterx,0),(screenCenterx,screenHeight))
def setxy(self,x,y):
self.rect.centerx = screenCenterx + x
self.rect.centery = screenCentery - y
def setHeading(self,heading):
self.heading = heading % 360
def turn(self,angle):
self.heading = (self.heading + angle) % 360
def forward(self,step):
oldx = self.rect.centerx
oldy = self.rect.centery
#乘以1000是用来消除误差,但好像没有效果
newx = 1000* self.rect.centerx + 1000* step * math.sin(math.radians(self.heading))
newy = 1000* self.rect.centery - 1000* step * math.cos(math.radians(self.heading))
self.rect.centerx = newx //1000
self.rect.centery = newy //1000
if self.status==1: #如果落笔,那么就画线
pygame.draw.line(screen,self.color,(oldx,oldy),(self.rect.centerx,self.rect.centery),self.thickness)
def coloradd(self):
h,l,s, = colorsys.rgb_to_hls(self.color[0]/255,self.color[1]/255,self.color[2]/255)
h = h + 0.01
r,g,b = colorsys.hls_to_rgb(h,l,s)
self.color = (int(r*255),int(g*255),int(b*255))
def draw(self):
if self.visible==1:
screen.blit(self.image,self.rect)
def main():
pen = Pen((255,0,0),4)
pen.drawaxis()
pen.hide()
pen.setxy(0,0)
pen.setHeading(-90)
pen.down()
for i in range(360):
pen.forward(100)
pen.setxy(0,0)
pen.turn(1)
pen.coloradd()
pen.up()
clock = pygame.time.Clock()
运行中 = True
while 运行中:
for event in pygame.event.get():
if event.type==QUIT:运行中=False
pen.draw()
pygame.display.update()
clock.tick(10)
pygame.quit()
if __name__=="__main__":
main()