Custom Shape Tool
The custom shape tool allows you to draw a custom shape (polygon) of your choice by setting vertices.
Just click the start point then move the mouse and click to set the shape. Right-click the end point to finish. Click and drag points to edit. Right-click again to apply.

Use the anti-alias mode to enable or disable anti-aliasing. When anti-aliasing is enabled (default); all drawing is done at the sub-pixel level to give you the highest quality results.
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Border only
Fill only
Border and Fill
Alpha-blend