---
title: "Path.Widen Method (Pen, Single)"
canonical: https://www.graphicsmill.com/docs/gm/M_Aurigma_GraphicsMill_Drawing_Path_Widen_2_732dd298.htm
archived: false
applies_to:
  - product: "Graphics Mill"
    versions: ["12.1", "6.x-12.x (may differ)"]
    entity_id: "https://www.graphicsmill.com/#software-application"
---

# Path.Widen Method (Pen, Single)

**Applies to:** Graphics Mill 12.1, 6.x-12.x (may differ)
 
Replaces the path with the outline of its stroke drawn with the specified pen, using the specified arc tolerance.
 
**Namespace:** [Aurigma.GraphicsMill.Drawing](https://www.graphicsmill.com/docs/gm/N_Aurigma_GraphicsMill_Drawing.htm.md)
 **Assembly:** Aurigma.GraphicsMill (in Aurigma.GraphicsMill.dll)
 
## Syntax
  
```csharp
public void Widen(Pen pen,float arcTolerance
)
```
 
### Parameters
 
 - pen
     - Type: [Aurigma.GraphicsMill.Drawing.Pen](https://www.graphicsmill.com/docs/gm/T_Aurigma_GraphicsMill_Drawing_Pen.htm.md)
The pen. Its width, line join, line cap, miter limit, dash pattern, and dash offset are used.

 - arcTolerance
     - Type: System.Single
The largest allowed deviation of a round corner or cap from the true arc. Must be greater than 0.
 
## Remarks
  
Round joins and round caps are made of straight segments. The arcTolerance parameter is the largest allowed distance between these segments and the true arc. A smaller value gives more segments and a smoother result. A larger value gives fewer segments, so the path has fewer points and is faster to process. The [Widen(Pen)](https://www.graphicsmill.com/docs/gm/M_Aurigma_GraphicsMill_Drawing_Path_Widen_1_00aeac81.htm.md) overload uses 0.1.
 
The value is in path units, so choose it relative to the output size. For example, 0.1 is invisible when one unit is one pixel. It may be visible if you scale the path up a lot later.
 
## Examples
  
```csharp
var pen = new Pen(RgbColor.Black, 60f)
{
    LineJoin = LineJoin.Round,
    LineCap = LineCap.Round
};

var coarse = new Path();
coarse.MoveTo(45, 105);
coarse.LineTo(105, 45);

var fine = new Path(coarse);

// Round caps deviate from the true arc by up to 3 units. They have few points.
coarse.Widen(pen, 3f);

// Round caps deviate from the true arc by up to 0.1 units (the default). They have many points.
fine.Widen(pen, 0.1f);
```
 
The round caps with a large and a small arc tolerance. The dots show the points of the paths.
 ![The round caps with a large and a small arc tolerance.](https://www.graphicsmill.com/docs/gm/PathWidenArcTolerance.png)
 
## Exceptions
  
|  Exception |  Condition |
| --- | --- |
 |  System.ArgumentNullException |  The pen is `null`. |
 |  System.ArgumentOutOfRangeException |  The pen width is not greater than 0, the miter limit is less than 1, or the arc tolerance is not greater than 0. |
   
## See Also

### Reference

- [Path Class](https://www.graphicsmill.com/docs/gm/T_Aurigma_GraphicsMill_Drawing_Path.htm.md)
- [Widen Overload](https://www.graphicsmill.com/docs/gm/O_T_Aurigma_GraphicsMill_Drawing_Path_Widen.htm.md)
- [Aurigma.GraphicsMill.Drawing Namespace](https://www.graphicsmill.com/docs/gm/N_Aurigma_GraphicsMill_Drawing.htm.md)

### Manual

- [Working with Paths](https://www.graphicsmill.com/docs/gm/working-with-path.htm.md)