Create a Path with the Draw Tool
The Draw tool is a freehand tool. It creates a curved path that follows the cursor as you draw. You can use it to create graphics that resembles a hand-drawn image. It is possible to edit the created path.
Unlike the Pen tool, with which you place anchor points directly, the Draw tool adds anchor points automatically depending on the curvature of the path. An almost straight path may require only two anchor points on its ends, while a zigzag requires an anchor point every time it changes its direction. Another factor that determines the amount and location of anchor points is the Smoothing parameter. We will discuss it later.
The Draw tool operates in two modes. Any time you draw, you are actually using either the Pencil or Brush tool. The Draw tool creates a path. How this path looks depends on whether the Stroke or Brush property is applied to the path. You can switch between Stroke and Brush using the Appearance panel.
Settings of the Draw Tool
Settings of the Draw tool are located in the Control panel.
The Smoothing parameter defines the amount of smoothing applied to the path. Higher values make the curve more smooth. If you want to create a path that follows the cursor as accurately as possible, set the parameter to "1".
The Close Path Within Radius automatically closes the path that you draw. This happens only when the end point is placed within the specified distance from the start end. The edit box lets you set that distance. The distance is measured in "screen pixels" and, consequently, doesn't depend on the canvas zoom level.
To quickly change the stroke width before or after drawing it, use these keys: [ to decrease, and ] to increase.
The Profile pop-up menu lets you choose one of three modes of the tool: Uniform, Pressure and Custom.
The Uniform profile lets you create a Stroke with constant width. It is used for the Pencil tool.
The Custom profile allows variable width strokes. It can be used with both Pencil and Brush tools. The Brush tool changes the stroke width depending on the direction of the path. The Pencil tool can produce lines with variable width if you select a non-uniform profile in the Stroke settings.
The Pressure profile lets you control the Stroke width using a stylus, which has a pressure sensor. The more pressure you apply, the thicker the stroke becomes. It doesn't support Brush strokes. Click on the gear icon to access settings of this profile.
The Width parameter defines the maximum stroke width. It mirrors the Width parameter for a stroke in the Appearance panel.
The Variation parameter defines how much the stroke width changes depending on the pressure.
With lower values of Accuracy, the program normalizes the stroke width depending on the length of the path. So, while you are drawing, the already drawn part of the path can re-adjust its stroke width automatically. To make the stroke width remain exactly as you have drawn it, set the Accuracy to 100%.