bresenham算法画圆c++
时间: 2023-11-13 12:52:24 浏览: 47
Bresenham算法是一种用于在计算机屏幕上绘制线条和圆的算法。下面是使用Bresenham算法绘制圆的C代码示例:
```c
#include<stdio.h>
#include<graphics.h>
void drawCircle(int xc, int yc, int x, int y)
{
putpixel(xc+x, yc+y, WHITE);
putpixel(xc-x, yc+y, WHITE);
putpixel(xc+x, yc-y, WHITE);
putpixel(xc-x, yc-y, WHITE);
putpixel(xc+y, yc+x, WHITE);
putpixel(xc-y, yc+x, WHITE);
putpixel(xc+y, yc-x, WHITE);
putpixel(xc-y, yc-x, WHITE);
}
void bresenhamCircle(int xc, int yc, int r)
{
int x = 0, y = r;
int d = 3 - 2 * r;
while (x <= y)
{
drawCircle(xc, yc, x, y);
if (d <= 0)
{
d = d + 4 * x + 6;
}
else
{
d = d + 4 * (x - y) + 10;
y--;
}
x++;
}
}
int main()
{
int gd = DETECT, gm;
initgraph(&gd, &gm, "");
int xc = 250;
int yc = 250;
int r = 100;
bresenhamCircle(xc, yc, r);
getch();
closegraph();
return 0;
}
```
这段代码使用了`putpixel`函数来绘制像素点,根据Bresenham算法的原理,在每个八分之一圆弧上设置像素点即可完成整个圆的绘制。