MidpointLine

标签：int color MidpointLine y0 x0 x1

#include < graphics.h > 
#include < math.h > 
void MidpointLine(int x0, int y0, int x1, int y1);
int main(void) {
    int gdriver = DETECT,
    gmode,
    errorcode;
    int bkcolor,
    midx,
    midy;
    initgraph( & gdriver, &gmode, "");
    setcolor(RED);
    MidpointLine(0, 0, 639, 479);
    getch();
    closegraph();
    return 0;
}
void MidpointLine(int x0, int y0, int x1, int y1) {
    int color;
    int a,
    b,
    delta1,
    delta2,
    d,
    x,
    y;
    a = y0 - y1;
    b = x1 - x0;
    d = a + a + b;
    delta1 = a + a;
    delta2 = a + a + b + b;
    x = x0;
    y = y0;
    color = getcolor();
    putpixel(x, y, color);
    while (x < x1) {
        if (d < 0) {
            x++;
            y++;
            d += delta2;
        } else {
            x++;
            d += delta1;
        }
        putpixel(x, y, color);
    }
}

标签：int,color,MidpointLine,y0,x0,x1
From： https://blog.51cto.com/u_16076050/6195984