To create a labeled point, tap in an open area.

To create a line or segment, touch the initial position, and then drag to the end position.

Note: The default tolerance for detecting parallel/perpendicular lines is 12.5 degrees. This tolerance can be redefined using a variable named
ti_gg_fd.angle_tol. You can change the tolerance in the current problem by setting this variable in the calculator app to a value in the range 0 through 45 (0=no parallel/perpendicular detection).

To create a circle or ellipse, use the touchscreen to draw the approximate shape.

To create a triangle, draw a triangle-like shape.

To create a rectangle or square, use the touchscreen to draw the perimeter.

To create a polygon, tap a succession of existing points, ending on the first point you tapped.

In the Graphs view, MathDraw attempts to recognize certain gestures as functions for analytic parabolas.

Note: The default step value for quantization of the parabola coefficients is 1/32. The denominator of this fraction can be redefined using a variable named ti_gg_fd.par_quant. You can change the step value in the current problem by setting this variable to a value greater or equal to 2. A value of 2, for example, produces a step value of 0.5.

To measure the angle between two existing lines, use the touchscreen to draw a circle arc from one of the lines to the other.

To create a point midway between two points, tap point 1, point 2, and then point 1 again.

To erase objects, use the touchscreen to drag left and right, similar to the motion of erasing a whiteboard.