Shape tools are located in the brush panels, above the brush list, and work in relation with the brush you are using.
There are 4 shape tools: the free-hand, the straight line, the rectangle and the ellipse. All the shapes have a filled option which you can access by taping on the shape a second time, except for the straight line.
The free-hand is the default drawing tool, if you tap a second time on the shape, you can draw a filled shape.
When you draw a filled shape, you don’t see the brush but a default drawing line and the shape fills after you release the Pencil.
The brush tip and texture are applied only to empty shapes: free-hand line, straight line, empty rectangle and empty ellipse. Filled shapes do not use brushes tips.
Hold one finger down on the screen while drawing a line to snap it every 15° angle.
Hold two fingers down to draw a line from its center.
Hold three fingers down to draw a line from its center which snaps every 15° angle.
When drawing an empty rectangle or ellipse, the chosen brush replaces the outline. However, the filled rectangle or ellipse does not take the brush into account.
Hold one finger down while drawing a rectangle to draw a perfect square.
Hold two fingers down to draw a rectangle from its center.
Hold three fingers down to draw a square from its center.
The same gestures can be used for the ellipses.
One finger to draw a circle.
Two fingers to draw an ellipse from its center.
And three fingers to draw a circle from its center.
These shapes are also available in the eraser brush panel.