The pen tool (bezier)
Bessel curve, also known as bezier curve, it is by the French mathematician Pierre bezier study a method of vector drawing,
Bezier curve is composed of line segments and node (anchor), the node can be dragged to stand, and line segment as a scalable elastic, node connection line and control point (virtual), change while moving the control points at the ends of the curve of curvature (curved)
Create "beisaier curve" tool in PHOTOSHOP is called "pen tool" because most of the time with computer drawing is operating a mouse to control the path of the line, with the hand feel and effect have very big difference, even a smart artist can easily draw various graphics, to get the mouse wants to follow one's inclinations of the drawing is not an easy thing, so the bezier curve to a large extent make up for the defects,
Drawing skills:
1. Hold down the Ctrl key, can be caused by temporary transformation for direct selection tool, the pen tool
2. Hold down the Shift key to keep the line of control, 0 degrees//rotate 90 degrees to 45 degrees change curve
3. Select a single anchor, hold down the Alt key and drag the control point, can change the direction of a single handle,
4. Hold down the Alt key, click the anchor, by transforming the smooth and the corner of the anchor, to edit the shape and path

Tool shortcut keys
The pen tool
Freedom of the pen tool P

Select multiple anchor direct selection tool + Shift key and click the
Select the direct selection tool path + Alt key and click the
Copy path pen (any pen tool), path selection tool or directly select tool + Ctrl + Alt and drag to move
From the path selection tool, the pen tool, add anchor point tool and delete anchor point tool or viewing tool to switch to direct selection tool Ctrl
When the pointer in the direction of anchor point or point switch from the pen tool or freedom of the pen tool to breaking point tool Alt
Closed magnetic pen tool path + double-click
Closed with straight line the path of the magnetic pen tool + Alt key and double-click