Page 347 - Making things move_ DIY mechanisms for inventors, hobbyists, and artists

324 Making Things Move

case 7: //go downRight
if(((totalWidth + randomDistance) < CANVASWIDTH) && ((totalHeight
- randomDistance) > 0))
{
downRight(randomDistance);
totalWidth += randomDistance;
totalHeight -= randomDistance;
}
break;
case 8: //go downLeft
if(((totalWidth - randomDistance) > 0) && ((totalHeight -
randomDistance) > 0))
{
downLeft(randomDistance);
totalWidth -= randomDistance;
totalHeight -= randomDistance;
}
break;

default: //just in case
left(0);

} //end switch
} //end else

} //end loop()
/*
Here are the directional functions. Loop size = distance.
Positive step numbers are clockwise, negative counterclockwise
*/

void up(int distance)
{
for(i=0;i< distance; i++) {
right_motor.step(1);
left_motor.step(-1);
}
}

void down(int distance)
{
for(i=0;i< distance; i++) {
right_motor.step(-1);
left_motor.step(1);
}
}