35 lines
847 B
Markdown
35 lines
847 B
Markdown
---
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title: "Polygon"
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date: 2019-09-14T20:55:54-07:00
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weight: 40
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---
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To define a polygon, pass a variable number of **Position2D** structs representing the points of the polygon.
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```cs
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var polygon = new Polygon(
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new Position2D(-2, 0),
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new Position2D(0, 2),
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new Position2D(2, 0),
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);
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```
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This polygon, for example, is a triangle.
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Be careful not to define a concave Polygon, as this will cause the results of collision detection to be incorrect. Support for concave polygons is planned for a future release.
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Polygons are considered equal if they define the same vertices, regardless of order. They can even be equivalent to Rectangles:
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```cs
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var a = new Polygon(
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new Position2D(1, 1),
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new Position2D(1, -1),
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new Position2D(-1, -1),
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new Position2D(-1, 1)
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);
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var b = new Rectangle(-1, -1, 1, 1);
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a == b; // true!
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```
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