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Random direction change constrained to 90 degrees
Hey guys, I’m looking for some expression help. I have a square shape layer setup within a grid system. Every 25 frames I would like that square to slide in to a random adjacent square in the grid, so every 25 frames the layer randomly moves either up, down, left or right in to another square in the grid.
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3 Replies
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This seems to work:
seedRandom(index,true);
moveDistance = 100;
moveEvery = framesToTime(25);
startPos = [960,540];
moves=[startPos];
possibleMoves = [[1,0],[-1,0],[0,1],[0,-1]];
st = thisLayer.startTime;
// create all moves up front
for (i=0; i < (thisComp.duration - st); i+=moveEvery) {
move = possibleMoves[ Math.floor(random(4)) ];
lastPos = moves[moves.length-1];
newPos = lastPos + move*moveDistance;
moves.push(newPos);
}
t=(time-st)%moveEvery;
step = Math.floor((time-st)/moveEvery);
easeOut( t, 0, moveEvery, moves[step], moves[step+1]); -
This version is better if you experience glitches: (sometimes doing % and / operations on time gives glitchy results, it depends on the framerate. using timeToFrames() can fix that)
seedRandom(index,true);
moveDistance = 100;
moveEvery = 25;
startPos = [960,540];
moves=[startPos];
possibleMoves = [[1,0],[-1,0],[0,1],[0,-1]];
st = thisLayer.startTime;
// create all moves up front
for (i=0; i<timeToFrames(thisComp.duration - st); i+=moveEvery) {
move = possibleMoves[ Math.floor(random(4)) ];
lastPos = moves[moves.length-1];
newPos = lastPos + move*moveDistance;
moves.push(newPos);
}
f=timeToFrames(time-st);
t=f%moveEvery;
step = Math.floor(f/moveEvery);
ease( t, 0, moveEvery, moves[step], moves[step+1]);
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This is incredible! Thank you so much Filip, both for the quick reply, and the awesome expression.
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