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Java - tetris code explanation please?

Computer Science
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I need a code for rotating the blocks but I have no idea how ! >.< I found this example on the internet: int items[]={ 0,0, -1,0, 0,-1, -1,-1, // cube, normal 0,0, -1,0, 0,1, -1,1, // rotated 90 degrees 0,0, 1,0, 0,1, 1,1, // rotated 180 degrees 0,0, 1,0, 0,-1, 1,-1, // rotated 270 degrees 0,0, 0,-1, 0,-2, 0,-3, // straight line 0,0, -1,0, -2,0, -3,0, 0,0, 0,1, 0,2, 0,3, 0,0, 1,0, 2,0, 3,0, 0,0, 1,0, 0,-1, -1,-1, // stupid block 0,0, 0,-1, -1,0, -1, 1, 0,0, -1,0, 0,1, 1,1, 0,0, 0,1, 1,0, 1,-1, 0,0, -1,0, 0,-1, 1,-1, // stupid block 2 0,0, 0,1, -1,0, -1,-1, 0,0, 1,0, 0,1, -1,1, 0,0, 0,-1, 1,0, 1,1, 0,0, 1,0, -1,0, 0,-1, // another one 0,0, 0,1, 0,-1, -1,0, 0,0, 0,1, -1,0, 1,0, 0,0, 1,0, 0,-1, 0,1, 0,0, 0,-1, 1,-1, 0,1, // hook one 0,0, -1,0, -1,-1, 1,0, 0,0, -1,1, 0,1, 0,-1, 0,0, -1,0, 1,0, 1,1, 0,0, 0,1, 0,-1, -1,-1, // hook two 0,0, 1,0, -1,0, -1,1, 0,0, 0,-1, 0,1, 1,1, 0,0, -1,0, 1,0, 1,-1 }; int checks[]={ -1,1, 0,1, -1,1, 0,1, // check cube, normal -1,2, 0,2, -1,2, 0,2, // check, rotated 90 degrees 0,2, 1,2, 0,2, 1,2, // check, rotated 180 degrees 0,1, 1,1, 0,1, 1,1, // check, rotated 270 degrees 0,1, 0,1, 0,1, 0,1, 0,1, -1,1, -2,1, -3,1, 0,4, 0,4, 0,4, 0,4, // straight line 0,1, 1,1, 2,1, 3,1, 0,1, -1,0, 1,1, 0,1, // stupid block one 0,1, -1,2, 0,1, -1,2, 0,2, 1,2, -1,2, 0,2, 0,2, 1,1, 0,2, 1,1, -1,1, 0,1, 1,0, 1,0, // stupid block two -1,1, 0,2, 0,2, -1,1, -1,2, 0,2, 1,1, 1,1, 0,1, 1,2, 0,1, 1,2, -1,1, 0,1, 1,1, 1,1, // block three -1,1, 0,2, 0,2, -1,1, -1,1, 0,2, 1,1, 1,1, 0,2, 1,1, 0,2, 1,1, 0,2, 1,0, 1,0, 0,2, // hook one -1,1, 0,1, 1,1, 1,1, -1,2, 0,2, 0,2, -1,2, -1,1, 0,1, 1,2, 1,2, -1,0, 0,2, 0,2, -1,0, // hook two -1,2, 0,1, 1,1, 1,1, 0,2, 1,2, 1,2, 0,2, -1,1, 0,1, 1,1, 1,1 };
Can someone please explain the code for me please? why is there a list of coordinates? Is that an array or something? MY TEACHERS MAKING ME DO THE IMPOSSIBLE IVE ONLY BEEN STUDYING COMPUTER SCIENCE FROM SCRATCH SINCE OCTOBER HOW THE HELL DO I PROGRAM TETRIS I BARELY CAN MAKE A CALCULATOR PANICCCCCCCCCC

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