Next to the pen tool in the Toolbars panel, you will find another similar pen tool known as the Curvature Tool. Refer to Figure 7-28.

Figure 7-28. Toolbars panel Curvature Tool
I investigated this tool in my book Accurate Layer Selections Using Photoshop’s Selection Tools. However, this tool is not required for this book.
While I will not be going into any detail in this book as it is not part of the later project in Chapter 9, I will just note a few tips about the tool you can use on your own.
\ 1.\ It is like the Photoshop Curvature Pen Tool. Refer to Figure 7-29.

Figure 7-29. Photoshop’s Curvature Pen Tool
\ 2.\ The Curvature Tool can be used to create a curved path as you click and drag and observe the rubber band preview of the path. Refer to Figure 7-30.

Figure 7-30. Creating a path with the Curvature Tool and the preview of the path
\ 3.\ You can close the path when you click the original point. Refer to Figure 7-31.

Figure 7-31. Closing the path with the Curvature Tool
\ 4.\ Once the path is closed, you can select points on the path if you need to move them to scale the path.
\ 5.\ You can also add points to the selected path by clicking a part of the path. Refer to Figure 7-32.

Figure 7-32. Adding points to the path with the Curvature Tool
\ 6.\ As with the Pen Tool, you can hold down the Ctrl/CMD key to release on the next click and keep the path open.
\ 7.\ You can also use the Shift key while clicking to keep the anchor points level.
\ 8.\ Hold down the Alt/Option key or double-click as you click to create a straight path. Refer to Figure 7-33.

Figure 7-33. Creating straight paths and corner points with the Curvature Tool
\ 9.\ While a point is selected, press the Backspace/Delete key to remove the point but not the path. Refer to Figure 7-34.

Figure 7-34. Deleting points from the path with the Curvature Tool
\ 10.\ Double-click a point when you want to make it cornered or curved. Refer to Figure 7-35.

Figure 7-35. Change the point of a path from corner to smooth and curved by double-clicking with the Curvature Tool
Likewise, you can switch to the Pen Tool at any time to complete or edit the path. You can refer to my file curve_practice_diagram.ai.