Pencil ​

Use the pencil tool to draw lines freely on the image. You can set the thickness and color parameters of the pencil in the options bar of the pencil tool.

Draw Straight Line ​

While using the pencil, you can hold down the Shift key at any time. At this time, the pencil can draw a straight line starting from the position when the Shift key was pressed and ending at the mouse position. The default is free angle. If you want to align to a specific angle, you can go to "Config" - "Annotate" - "Pencil Drawing Mode while Holding Shift" to set it.