將橢圓繪製到C中的矩形中

Question

下面的C代碼將繪製一個矩形。我知道如何繪製橢圓，但我如何繪製一個橢圓到這個矩形？

#include<graphics.h> 
#include<conio.h> 

main() 
{ 
    int gd = DETECT, gm; 

    initgraph(&gd, &gm, "C:\\TC\\BGI"); 

    rectangle(100,100,200,200); 

    getch(); 
    closegraph(); 
    return 0; 
} 

Answer 1

Asuming您使用的ellipsefunction從graphics.h，你可以做到以下幾點：

int left = 100; 
int right = 200; 
int top = 100; 
int bottom = 200; 

rectangle(left, top, right, bottom); 

int x = (left + right)/2; 
int y = (top + bottom)/2; 
int start = 0; 
int end = 360; 
int xrad = (right - left)/2; 
int yrad = (bottom - top)/2; 

ellipse(x, y, start, end, xrad, yrad);