Bresenham算法画线程序源代码

以下是Bresenham算法画线程序的源代码：

#include <stdio.h>
#include <graphics.h>

void bresenham(int x1, int y1, int x2, int y2)
{
    int dx = x2 - x1;
    int dy = y2 - y1;
    int x = x1;
    int y = y1;
    int p = 2 * dy - dx;

    while (x < x2)
    {
        if (p >= 0)
        {
            putpixel(x, y, WHITE);
            y++;
            p = p + 2 * dy - 2 * dx;
        }
        else
        {
            putpixel(x, y, WHITE);
            p = p + 2 * dy;
        }
        x++;
    }
}

int main()
{
    int gd = DETECT, gm;
    initgraph(&gd, &gm, "");

    bresenham(100, 100, 300, 300);

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

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