C中图形的矩阵排序

Question

我正在用graphics.h开发一个程序，在CI中尝试实现矩阵屏幕保护程序，但是我被困在代码中。字母只掉了一次，我希望它们继续掉下来（之前删除文本）。请指导我如何清除旧内容

void main_page(void)
{
    int  i,j,k,l,m,n,size;
    setcolor(BLUE);
    for(i=0;i<500;i+=50)
    {
            settextstyle(GOTHIC_FONT,1,1);
            outtextxy(50,50+i,"a b c");
            outtextxy(100,150+i,"H I J");
            outtextxy(150,250+i,"X Y Z");
            outtextxy(300,50+i,"D E F");
            outtextxy(350,350+i,"D E F");
            outtextxy(400,350+i,"D E F");
            outtextxy(450,350+i,"D E F");
            outtextxy(500,50+i,"D E F");
            outtextxy(550,350+i,"D E F");
            outtextxy(600,350+i,"D E F");

            delay(100);
    }

Answer 1

您是否不必删除或覆盖旧位置中的字符？ 因此，您可以自下而上，而不是自上而下，最后打印一些空白？

添加：嗯，这是一种非常蛮力的方式，我不喜欢。 用以下代码替换循环中的代码：

            settextstyle(GOTHIC_FONT,1,1);
            outtextxy( 50, 50+i,"a b c");
            outtextxy(100,150+i,"H I J");
            outtextxy(150,250+i,"X Y Z");
            outtextxy(300, 50+i,"D E F");
            outtextxy(350,350+i,"D E F");
            outtextxy(400,350+i,"D E F");
            outtextxy(450,350+i,"D E F");
            outtextxy(500, 50+i,"D E F");
            outtextxy(550,350+i,"D E F");
            outtextxy(600,350+i,"D E F");

            delay(100);

            outtextxy( 50, 50+i,"     ");
            outtextxy(100,150+i,"     ");
            outtextxy(150,250+i,"     ");
            outtextxy(300, 50+i,"     ");
            outtextxy(350,350+i,"     ");
            outtextxy(400,350+i,"     ");
            outtextxy(450,350+i,"     ");
            outtextxy(500, 50+i,"     ");
            outtextxy(550,350+i,"     ");
            outtextxy(600,350+i,"     ");