在C中的矩阵排序图形

Question

我正在用CI中的graphics.h制作一个程序，我试图实现矩阵屏幕保护程序，但是我在代码中停留在这里。字母只会掉落一次。我希望它们继续下降（删除文本前）。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

你没有删除或旧的位置上写的字？所以你可能会自下而上，而不是自上而下，最后，最后打印一些空白？

补充：好吧，这是一个非常蛮力的方式来做到这一点，我不喜欢。用你的循环替换你的循环中的代码：

  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,"  ");