C语言Bresenham算法完整画线

/* WIN-TC BGI 图形编程模板 */ #include "Conio.h" #include "graphics.h" #define closegr closegraph void initgr(void) /* BGI初始化 */ { int gd = DETECT, gm = 0; /* 和gd = VGA,gm = VGAHI是同样效果 */ registerbgidriver(EGAVGA_driver);/* 注册BGI驱动后可以不需要.BGI文件的支持运行 */ initgraph(&gd, &gm, ""); } void Bresenham(int x0,int y0,int x1,int y1,int color) { int x,y,dx,dy,e,i; double k; dx=x1>x0?x1-x0:x0-x1; dy=y1>y0?y1-y0:y0-y1; if(dy==0) { x=x0>x1?x1:x0; y=y1; for(i=0;i<=dx;i++) { putpixel(x,y,color); x=x+1; } return; } else if(dx>=dy) { k=(x0-x1)*(y0-y1); e=-dx; x=x0>x1?x1:x0; if(k>0) y=y0>y1?y1:y0; else y=y0>y1?y0:y1; for(i=0;i<=dx;i++) { putpixel(x,y,color); x=x+1; e=e+2*dy; if(e>=0) { y=k>0?y+1:y-1; e=e-2*dx; } } } else { k=(x0-x1)*(y0-y1); e=-dy; y=y0>y1?y1:y0; if(k>0) x=x0>x1?x1:x0; else x=x0>x1?x0:x1; for(i=0;i<=dy;i++) { putpixel(x,y,color); delay(10000); y=y+1; e=e+2*dx; if(e>=0) { if(k>0) x++; else x--; e=e-2*dy; } } } } int main(void) { initgr(); /* BGI初始化 */ Bresenham(100,50,50,200,4); getch(); line(100,50,50,200); getch(); /* 暂停一下，看看前面绘图代码的运行结果 */ closegr(); /* 恢复TEXT屏幕模式 */ return 0; }