{
int xmax, ymax;
int startx,starty,endx,endy;
setbkcolor(WHITE);
xmax = getmaxx();
ymax = getmaxy();
endx=20;endy=20;
startx=10;starty=10;
setcolor(RED);
settextstyle(1,HORIZ_DIR,4);
outtextxy(10,240,"Bus Bus Bus");
outtextxy(300,300,"Made by PU BIN.");
setlinestyle(SOLID_LINE,0,3);
setwritemode(XOR_PUT);
setcolor(GREEN);
while(startx<xmax&&starty<ymax)
{
rectangle(startx,starty,endx,endy);
delay(4);
rectangle(startx,starty,endx,endy);
startx+=2;
starty+=startx*startx/2000;