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Python的turtle模塊畫國旗主要用到兩個(gè)函數(shù):draw_rentangle和draw_star。
至于函數(shù)的調(diào)用就和我們學(xué)的C,C++是一樣的。對(duì)于turtle畫國旗的程序中,首先是查找國旗的畫法,才能用程序?qū)崿F(xiàn)。自己在實(shí)現(xiàn)的過程中主要是對(duì)turtle.circle()沒有準(zhǔn)確掌握,所以花了一些不必要的時(shí)間。turtle.circle畫弧時(shí),海龜(turtle)的方向就是弧的切線方向,也就是說turtle的垂直方向就是圓心在的直線上,給定參數(shù)radius就可以畫了,程序中第二注意的地方就是小五角星和大五角星的位置關(guān)系,主要是程序中的turtle.left(turtle.towards(center_x,center_y)-turtle.heading()),當(dāng)然,我看有的人用了round()函數(shù)來獲取近似值,但是,默認(rèn)的已經(jīng)足夠了。下面是本人寫的程序和結(jié)果演示。
import time import turtle import os ''' 想要學(xué)習(xí)Python?Python學(xué)習(xí)交流群:984632579滿足你的需求,資料都已經(jīng)上傳群文件,可以自行下載! ''' def draw_rectangle(start_x,start_y,rec_x,rec_y): turtle.goto(start_x,start_y) turtle.color('red') turtle.fillcolor('red') turtle.begin_fill() for i in range(2): turtle.forward(rec_x) turtle.left(90) turtle.forward(rec_y) turtle.left(90) turtle.end_fill() def draw_star(center_x,center_y,radius): turtle.setpos(center_x,center_y) #find the peak of the five-pointed star pt1=turtle.pos() turtle.circle(-radius,72) pt2=turtle.pos() turtle.circle(-radius,72) pt3=turtle.pos() turtle.circle(-radius,72) pt4=turtle.pos() turtle.circle(-radius,72) pt5=turtle.pos() #draw the five-pointed star turtle.color('yellow','yellow') turtle.fill(True) turtle.goto(pt3) turtle.goto(pt1) turtle.goto(pt4) turtle.goto(pt2) turtle.goto(pt5) turtle.fill(False) #start the project turtle.speed(5) turtle.penup() #draw the rectangle star_x=-320 star_y=-260 len_x=660 len_y=440 draw_rectangle(star_x,star_y,len_x,len_y) #draw the big star pice=660/30 big_center_x=star_x+5*pice big_center_y=star_y+len_y-pice*5 turtle.goto(big_center_x,big_center_y) turtle.left(90) turtle.forward(pice*3) turtle.right(90) draw_star(turtle.xcor(),turtle.ycor(),pice*3) #draw the small star turtle.goto(star_x+10*pice,star_y+len_y-pice*2) turtle.left(turtle.towards(big_center_x,big_center_y)-turtle.heading()) turtle.forward(pice) turtle.right(90) draw_star(turtle.xcor(),turtle.ycor(),pice) #draw the second star turtle.goto(star_x+pice*12,star_y+len_y-pice*4) turtle.left(turtle.towards(big_center_x,big_center_y)-turtle.heading()) turtle.forward(pice) turtle.right(90) draw_star(turtle.xcor(),turtle.ycor(),pice) #draw the third turtle.goto(star_x+pice*12,star_y+len_y-7*pice) turtle.left(turtle.towards(big_center_x,big_center_y)-turtle.heading()) turtle.forward(pice) turtle.right(90) draw_star(turtle.xcor(),turtle.ycor(),pice) #draw the final turtle.goto(star_x+pice*10,star_y+len_y-9*pice) turtle.left(turtle.towards(big_center_x,big_center_y)-turtle.heading()) turtle.forward(pice) turtle.right(90) draw_star(turtle.xcor(),turtle.ycor(),pice) turtle.ht() time.sleep(3) os._exit(1)
以上就是本文的全部內(nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持億速云。
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