在C中的矩陣排序圖形

Question

我正在用CI中的graphics.h製作一個程序，我試圖實現矩陣屏幕保護程序，但是我在代碼中停留在這裏。字母只會掉落一次。我希望它們繼續下降（刪除文本前）。請指導我如何清除舊內容

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

你沒有刪除或舊的位置上寫的字？所以你可能會自下而上，而不是自上而下，最後，最後打印一些空白？

補充：好吧，這是一個非常蠻力的方式來做到這一點，我不喜歡。用你的循環替換你的循環中的代碼：

  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,"  ");