My walls won't draw straight

TerraPlan straightens walls for you while you drag. When it locks, a dashed guide line runs through the start of the wall and a label like Straight across shows next to your finger. If you don't see that, one of these is usually why.

Snap is turned off

Look at Snap at the bottom right. If it's grayed out, tap it. TerraPlan says "Snapping on". With snap off, lines go exactly where your finger goes and only the length rounds to the inch.

Your drag was too far off straight

A wall locks when it's within about 8 degrees of straight across or straight up and down. Drag closer to straight, or skip the drag: tap the end of the last wall, type the length in Length on the bar at the bottom, and tap an arrow. See Type exact lengths.

It locked to the wrong thing

The label tells you what the wall followed:

• Parallel to wall or Square to wall means it lined up with another wall. If that wall is a bit crooked, the new one will be too. Fix the first wall, then redraw.
• 45° means it's within a few degrees of a 45-degree line.
• Corner, Middle or Meets wall means the end jumped to something nearby. Zoom in with a pinch. The snap distance stays the same on the screen, so at a closer zoom the end jumps less far.

There's a number in the Angle box

If the Angle box on the drawing bar has a number in it, pressing Enter draws at that angle. Clear the box to go back to the arrows.

A corner is just off square

Select the wall run. If a corner reads 89.6° or 90.4°, tap the angle, type 90 and tap ✓. See Set a corner angle.

A second finger touched the screen

A second finger turns the drag into a pinch zoom and the wall isn't drawn. Draw with one finger, or with an Apple Pencil and your hand resting on the glass.