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Table Of Contents
897Motion User Guide
Spiral Drawing generator in Motion
Like a toy from our youth, the Spiral Drawing generator draws curves based on a “pen”
that’s locked to a point on a gear (a rotor) that rolls within—or without—a larger ring (a
stator). While the pattern draws, the ring remains in a fixed location, and the gear rolls
along the inner edge or outer edge of the ring.
For an example using the Spiral Drawing generator, see Use Spiral Drawing onscreen
controls in Motion.
Adjust this generator using the controls in the Generator Inspector:
• Auto Draw: A checkbox that, when selected, creates an animated drawing. When Auto
Draw is deselected, the drawing is static.
• Auto Draw Style: A pop-up menu that sets the style of the drawing instrument. There
are two choices:
• Pen: Draws solid, even lines in the canvas in a pattern defined by the generator
controls.
• Laser: Simulates a laser in the canvas in a pattern defined by the generator controls.
• Draw Speed: A slider that adjusts how quickly the drawing is created.
• Cycle Start: A slider that sets the beginning location of the drawing.
• Center: A slider that sets the center of the generator pattern.
• Pen Color: Color controls that set the color of the drawing.
• Pen Width: A slider that defines the thickness of the drawn lines (Pen or Laser).
• Pen Blend Mode: A pop-up menu that sets the blend mode of the generator to Normal
or Add.
This setting is a separate from the blend mode of the group. Setting the Pen Blend
Mode to Add results in an additive effect (it’s added to the blend mode of the group).
• Pen Location: A slider that sets the position of the pen within the drawing gear. (You
can also use the Adjust Item tool to modify this parameter with onscreen controls. See
Modify or animate a generator in Motion.)
• Line Smoothness: A slider that defines how uniform the lines are. Lower the value to
create more crimped, linear lines.
• Ring Radius: A slider that controls the size of the drawing. When Inside Ring is chosen
from the Gear location pop-up menu, all drawing occurs inside the radius of the ring.
When Outside Ring is chosen from the Gear location pop-up menu, all drawing occurs
outside the radius of the ring. (You can also use the Adjust Item tool to modify this
parameter with onscreen controls.)