[python] 排序的动态展示

两句闲话

　　本文所说的排序是指基于交换的排序。因此，按理来说，本文应该叫基于交换的排序的动态展示，但是这样太拗口了。

效果展示

　　最终效果如下。

　　

　　

　　

实现方法

　　需要说明的是，在这里是通过pygame来实现图形界面；程序使用python 3.5编写。使用pygame的好处在于，它非常自由（当然也非常麻烦）。

　　我们一共需要编写四个文件：draw.py，sort_show.py，sort.py，main.py。

1.draw.py

　　在这里，我们先在draw.py中写一个Draw类，以实现pygame生成界面的基本流程。需要说明的是，这个类中有一些东西，在这里我们并不会用到。

# -*- coding: utf-8 -*-
"""
Created on Tue Dec 29 10:24:50 2015
 
@author: super zhang
"""
 
import pygame
from pygame.locals import *
 
class Draw:
    """
    to provide a general structure for using pygame
    STRUCTURE:
    self.mainloop()
        |-self.run_init()
        |   |-self.S_pre_run_init()
        |   |-self.S_update()
        |
        |-self.run()
            |-sef.S_event(event)
            |   |-self.S_keydown_event(key)
            |   |-self.S_keyup_event(key)
            |   |-self.S_mousebutton_event(button)
            |
            |-self.S_mouse_move_event()
            |-self.S_time()
            |-self.S_move()
            |-self.S_update()
                |-self.S_draw()
                |-self.S_load_img()
    METHOD:
    self.M_screen_mode(mode,SCREEN_SIZE)
    self.M_draw_text(size,text,pos,text_color)
    self.M_mouse_pos()
    self.M_load_img(img_file)
    """
    def __init__(self):
        self.SCREEN_SIZE=(720,480)
        self.screen_mode=0
    def M_screen_mode(self,mode,SCREEN_SIZE):
        """usually called in __init__"""
        self.screen_mode=mode
        self.SCREEN_SIZE=SCREEN_SIZE
    def mainloop(self):
        self.run_init()
        while True:
            self.run()
    def run_init(self):
        pygame.init()
        self.S_pre_run_init()
        self.screen=pygame.display.set_mode(self.SCREEN_SIZE,self.screen_mode,32)
        self.S_update()
    def S_pre_run_init(self):
        pass
    def run(self):
        for event in pygame.event.get():
            if event.type==QUIT:
                pygame.quit()
            else:
                self.S_event(event)
        self.S_mouse_move_event()
        self.S_time()
        self.S_move()
        self.S_update()
    def S_event(self,event):
        if event.type==KEYDOWN:
            self.S_keydown_event(event.key)
        elif event.type==KEYUP:
            self.S_keyup_event(event.key)
        elif event.type==MOUSEBUTTONDOWN:
            self.S_mousebutton_event(event.button)
    def S_keydown_event(self,key):
        pass
    def S_keyup_event(self,key):
        pass
    def S_mousebutton_event(self,button):
        pass
    def S_mouse_move_event(self):
        pass
    def S_time(self):
        pass
    def S_move(self):
        pass
    def S_update(self):
        self.screen.fill((0,0,0))
        self.S_draw()
        self.S_load_img()
        pygame.display.update()
    def S_load_img(self):
        pass
    def S_draw(self):
        pass
    def M_draw_text(self,size,text,pos,text_color):
        #for further use
        cur_font=pygame.font.SysFont("宋体",size)
        text_fmt=cur_font.render(text,1,text_color)
        self.screen.blit(text_fmt,pos)
    def M_mouse_pos(self):
        return pygame.mouse.get_pos()
    def M_load_img(self,img_file):
        return pygame.image.load(img_file)
 
if __name__=="__main__":
    d=Draw()
    d.mainloop()

2.sort_show.py　　　

　　下面是动态展示排序的主类，写在sort_show.py中

import pygame
from pygame.locals import *
 
from draw import Draw
 
class SortShow(Draw):
	def __init__(self,lst,lst_change):
		Draw.__init__(self)
		self.lst=lst
		self.lst_change=lst_change
		self.len=len(lst)
		self.max=max(lst)
		self.step=0
		self.whole_step=len(lst_change)
		self.time_delay=100#ms
		self.stop_flag=True
	def S_draw(self):
		pygame.time.delay(self.time_delay)
		self._change_lst()
		self._cal_rect()
		self._draw_rect()
		self._put_text()
	def _change_lst(self):
		if not self.stop_flag:
			if self.step<self.whole_step:
				changing=self.lst_change[self.step]
				i=changing[0]
				j=changing[1]
				flag=changing[2]
				if flag==1:
					self.lst[i],self.lst[j]=self.lst[j],self.lst[i]
				if flag==2:
					key=self.lst[j]
					del self.lst[j]
					self.lst[i+1:i+1]=[key]#move key
				self.step=self.step+1
	def _cal_rect(self):
		self.rects=[]
		x_div=720.0/self.len
		y_div=480.0/self.max/1.5
		for i in range(self.len):
			width=x_div-1
			height=self.lst[i]*y_div
			length=i*x_div
			top=480-height
			rect=[length,top,width,height]
			self.rects+=[rect]
 
		changing=self.lst_change[self.step-1]
		p1=changing[0]
		p2=changing[1]
		for i in [p1,p2]:
			width=x_div-1
			height=self.lst[i]*y_div
			length=i*x_div
			top=480-height
			rect=[length,top,width,height]
			self.rects+=[rect]
	def _draw_rect(self):
		for rect in self.rects[:-2]:
			pygame.draw.rect(self.screen,(255,255,255),rect,0)
			#rect: left,top,width,height
 
		if self.step<self.whole_step:
			for rect in self.rects[-2:]:
				pygame.draw.rect(self.screen,(0,0,255),rect,0)
	def _put_text(self):
		self.M_draw_text(20,"1.press esc to quit",(20,20),(0xff,0xff,0x0))
		self.M_draw_text(20,"2.press T to set delay_time",(20,40),(0xff,0xff,0x0))
		self.M_draw_text(20,"3.press s to start or stop",(20,60),(0xff,0xff,0x0))
	def S_keydown_event(self,key):
		if key==K_ESCAPE:
			exit()
		if key==K_t:
			self._set_time_delay()
		if key==K_s:
			self.stop_flag=not(self.stop_flag)
	def _set_time_delay(self):
		try:
			print ("-*-delay_time set-*-")
			time_delay=int(input("please input delay time\ndefalut vlaue is 100ms\ntime(ms):"))
			self.time_delay=time_delay
		finally:
			print ("-*-finish-*-")

3.sort.py

　　接下来，我们在sort.py中写冒泡排序（也可以写其他排序），这里的排序要输出每次交换的两个元素的下标

import random
 
def ge(min_value,max_value):
	def tmp(num):
		lst=[]
		for i in range(num):
			value=random.randint(min_value,max_value)
			lst.append(value)
		return lst
	return tmp
 
def bubble_sort(lst):
	lst1=lst[:]
	res=[]
	num=len(lst1)
	for i in range(num-1):#from 1 to num
		for j in range(num-1,i,-1):#from num-1 to i+1
			tmp=[j-1,j,0]
			if lst1[j-1]>lst1[j]:
				lst1[j-1],lst1[j]=lst1[j],lst1[j-1]
				tmp[2]=1
			res.append(tmp)
	return res
 
if __name__=="__main__":
	lst=ge(0,999)(100)
	changing=bubble_sort(lst)
        print (changing)

4.main.py

　　最后在main.py中，调用sort.py和sort_show.py

import sort
import sort_show
 
lst=sort.ge(0,999)(100)
changing=sort.bubble_sort(lst)
s=sort_show.SortShow(lst,changing)
s.mainloop()

　　运行main.py就能得到文章开始的效果了。