void main(void)
{
ppu_on_all();//enable rendering
//set initial coords
cat_x[0]=52;
cat_y[0]=100;
cat_x[1]=180;
cat_y[1]=100;
//init other vars
touch=0;//collision flag
frame=0;//frame counter
//now the main loop
while(1)
{
ppu_waitnmi();//wait for next TV frame
//flashing color for touch
i=frame&1?0x30:0x2a;
pal_col(17,touch?i:0x21);//set first sprite color
pal_col(21,touch?i:0x26);//set second sprite color
//process players
spr=0;
for(i=0;i<2;++i)
{
//display metasprite
spr=oam_meta_spr(cat_x[i],cat_y[i],spr,!i?metaCat1:metaCat2);
//poll pad and change coordinates
pad=pad_poll(i);
if(pad&PAD_LEFT &&cat_x[i]> 0) cat_x[i]-=2;
if(pad&PAD_RIGHT&&cat_x[i]<232) cat_x[i]+=2;
if(pad&PAD_UP &&cat_y[i]> 0) cat_y[i]-=2;
if(pad&PAD_DOWN &&cat_y[i]<212) cat_y[i]+=2;
}
//check for collision for a smaller bounding box
//metasprite is 24x24, collision box is 20x20
if(!(cat_x[0]+22< cat_x[1]+2 ||
cat_x[0]+ 2>=cat_x[1]+22||
cat_y[0]+22< cat_y[1]+2 ||
cat_y[0]+ 2>=cat_y[1]+22)) touch=1; else touch=0;
frame++;
}
}
PADpoll(u8 value)
{
return pad_poll(value);
}