如何用python完成：用自顶向下设计方法编写程序：在屏幕上打印三角函数y = sin(x)的图像。

发布网友发布时间：2022-04-18 01:54

共2个回答

热心网友时间：2022-04-18 03:23

I wrote this in Tkinter for you, in case you don't know Tkinter, it is a built-in mole for most python versions.

If you want a commandline version, you can ask me, but tell you what, since those values are all

float numbers, so it's hard to get a precise graph in commandline window.

Well, in this version, I enlarged each element's position by 40 and then change them to integer, guess this is an enrable loss of precision.

#

from math import radians
from math import sin
from Tkinter import *

pos = []
xPos = 0
centerX = 0
centerY = 0
for deg in range(-360, 361, 10):
pos.append([xPos, int(40*(sin(radians(deg))))]) #1000 too big for my screen
xPos+=1
if deg == 0:
centerX = xPos-1
centerY = pos[-1][1]

root = Tk()
root.title('trianble graph from -180 to 180')
width, height = 550, 450
mHei = height/2
mWid = width/2

canvas = Canvas(root, width=width, height=height)
canvas.create_line(0, mHei, width, mHei) #x axis
canvas.create_line(mWid, 0, mWid, height) #y axis

xStep = (width-150)/len(pos)
yStep = (height-150)/len(pos)

radius = 3
# the middle point (sin(0) is first drawn and used as position reference for all
canvas.create_oval(mWid-radius, mHei-radius, mWid+radius, mHei+radius, fill='green')

print pos
print xStep, yStep, centerX, centerY
#exit(0)
for i in pos:
if i[0] == centerX: #center processed already.
continue
x = mWid + xStep*(i[0]-centerX)
# y is smaller, the bigger the value, so use minus
y = mHei - yStep*(i[1]-centerY)
canvas.create_oval(x-radius, y-radius, x+radius, y+radius, fill='green')

canvas.pack()
root.mainloop()

热心网友时间：2022-04-18 04:41

#coding=utf-8
#name    格子绘图
import math
import random

def box(ox,oy,vv):
    """绘制图形 ox～格长 oy～格高
    vv～坐标列表
    dss～底色图案 hss绘图图案"""
    dss,hss = ".","*"
    ds=dss
    #print vv
    print "X",
    for x in range(ox+1):
        xs=chr(x+65)
        print "%s" % xs,
    print
    for y in range(oy,0,-1):
        print "%.2d" % y,
        for j in range(ox):
            for v in vv:
                if j==v[0]-1 and \
                   y==v[1]:
                   ds=hss
            print "%s" % ds,
            ds=dss
        print "%.2d" % y
    print "Y",
    for x in range(ox+1):
        xs=chr(x+65)
        print "%s" % xs,
    print
def dws(l): #返回坐标列表 l～点数
    vzb=[[0,0]]
    for i in range(1,l+1):
        x=i
        y=hansu(x)
        vzb.append([x,y])
    return vzb
def hansu(x): #计算坐标函数 x～x值
    #y=math.sin(x)
y=x
    return round(y)
if __name__=="__main__":
   box(20,20,dws(40))

追问

另外再问一下这种能显示行数的python是怎么搞出来的？我用的是这种