C语言经典100例(Python版本)061-065

时间：2007-09-17 来源：jcodeer

'''
【程序61】
题目：打印出杨辉三角形（要求打印出10行如下图）　　　
1.程序分析：
'''

if __name__ == '__main__':
    a = []
    for i in range(10):
        a.append([])
        for j in range(10):
            a[i].append(0)
    for i in range(10):
        a[i][0] = 1
        a[i][i] = 1
    for i in range(2,10):
        for j in range(1,i):
            a[i][j] = a[i - 1][j-1] + a[i - 1][j]
    from sys import stdout
    for i in range(10):
        for j in range(i + 1):
            stdout.write(a[i][j])
            stdout.write(' ')
        print

'''
【程序62】
题目：学习putpixel画点。
1.程序分析：　　　　　　　　　　　　
2.程序源代码：
#include "stdio.h"
#include "graphics.h"
main()
{
    int i,j,driver=VGA,mode=VGAHI;
    initgraph(&driver,&mode,"");
    setbkcolor(YELLOW);
    for(i=50;i<=230;i+=20)
        for(j=50;j<=230;j++)
            putpixel(i,j,1);
        for(j=50;j<=230;j+=20)
            for(i=50;i<=230;i++)
                putpixel(i,j,1);
}
'''

'''
题目：画椭圆ellipse　　　
1.程序分析：
2.程序源代码：
'''
if __name__ == '__main__':
    from Tkinter import *
    x = 360
    y = 160
    top = y - 30
    bottom = y - 30

    canvas = Canvas(width = 400,height = 600,bg = 'white')
    for i in range(20):
        canvas.create_oval(250 - top,250 - bottom,250 + top,250 + bottom)
        top -= 5
        bottom += 5
    canvas.pack()
    mainloop()

'''
题目：利用ellipse and rectangle 画图。
1.程序分析：
2.程序源代码：
'''
if __name__ == '__main__':
    from Tkinter import *
    canvas = Canvas(width = 400,height = 600,bg = 'white')
    left = 20
    right = 50
    top = 50
    num = 15
    for i in range(num):
        canvas.create_oval(250 - right,250 - left,250 + right,250 + left)
        canvas.create_oval(250 - 20,250 - top,250 + 20,250 + top)
        canvas.create_rectangle(20 - 2 * i,20 - 2 * i,10 * (i + 2),10 * ( i + 2))
        right += 5
        left += 5
        top += 10

    canvas.pack()
    mainloop()

'''
【程序65】
题目：一个最优美的图案。　　　
1.程序分析：
2.程序源代码：
'''
import math
class PTS:
    def __init__(self):
        self.x = 0
        self.y = 0
points = []

def LineToDemo():
    from Tkinter import *
    screenx = 400
    screeny = 400
    canvas = Canvas(width = screenx,height = screeny,bg = 'white')

    AspectRatio = 0.85
    MAXPTS = 15
    h = screeny
    w = screenx
    xcenter = w / 2
    ycenter = h / 2
    radius = (h - 30) / (AspectRatio * 2) - 20
    step = 360 / MAXPTS
    angle = 0.0
    for i in range(MAXPTS):
        rads = angle * math.pi / 180.0
        p = PTS()
        p.x = xcenter + int(math.cos(rads) * radius)
        p.y = ycenter - int(math.sin(rads) * radius * AspectRatio)
        angle += step
        points.append(p)
    canvas.create_oval(xcenter - radius,ycenter - radius,
                       xcenter + radius,ycenter + radius)
    for i in range(MAXPTS):
        for j in range(i,MAXPTS):
            canvas.create_line(points[i].x,points[i].y,points[j].x,points[j].y)

    canvas.pack()
    mainloop()
if __name__ == '__main__':
    LineToDemo()