Eclipse – Allows you to draw perfect Ellipses.Straight – Allows you to draw straight lines of various angles.PaintTool SAI has five primary ruler options. Hold down Ctrl or Alt to edit your ruler.Use the keyboard shortcut Ctrl + R to quickly show or hide your ruler.To access the other ruler options, locate them in the Ruler menu. PaintTool SAI’s default ruler is Straight.Click on the Perspective Ruler icon in the Layer panel to create a perspective ruler.PaintTool SAI also features perspective rulers including 1VP, 2VP, 3VP, 2VP grid, and 3VP grid.PaintTool SAI has five main ruler options in the ruler menu: Straight, Ellipse, Parallel Lines, Concentric Ellipse, and Vanishing Point.How to Use PaintTool SAI’s Three-Point Perspective Ruler.How to Use PaintTool SAI’s Two-Point Perspective Ruler.How to Use PaintTool SAI’s One-Point Perspective Ruler.How to Use PaintTool SAI’s Concentric Ellipse Ruler.