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If you want to determine "Manhattan" movement (cardinal directions only, make only one turn en-route to a given unmoving target point) on a step-by-step basis, you have to choose whether you prefer to move horizontally first, or vertically first.


if ( cX != dX ) {
if ( cX < dX )
cX += 1;
else
cX -= 1;
} else {
if ( cY < dY )
cY += 1;
else
cY -= 1;
}




That's for preferring to move across before up and down. Read cX = Current X, dX = Destination X.

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