Point, PointF, Size and SizeF: Unary minus operator

[ulfemsoy]

Background and motivation

I propose to add a unary minus operator to the Point, PointF, Size and SizeF structs. It is to improve readability during drawing operations.

API Proposal

namespace System.Drawing;

public struct Point
{
public static Point operator -(Point value) { return new Point(-value.X, -value.Y); }
}

public struct PointF
{
public static PointF operator -(PointF value) { return new PointF(-value.X, -value.Y); }
}

public struct Size
{
public static Size operator -(Size value) { return new Size(-value.Width, -value.Height); }
}

public struct SizeF
{
public static SizeF operator -(SizeF value) { return new SizeF(-value.Width, -value.Height); }
}

API Usage

// Translate
 graphics.TranslateTransform(
     pntLocation
 );

// Reverse translate
graphics.TranslateTransform(
     -pntLocation
 );

Alternative Designs

No response

Risks

No response

Will this feature affect UI controls?

No impact on UI controls.

[JeremyKuhne]

Seems like a reasonable request. If we do this, it should be done for all Point and Size types. I don't think it makes sense for Rectangle.

[JeremyKuhne]

@ulfemsoy would you mind updating the proposal to add both point and size types?

[teo-tsirpanis]

I think this should be moved to dotnet/runtime, that's where the source code for these types is.

[elachlan]

@merriemcgaw apparently this should be moved to runtime?

[JeremyKuhne]

@teo-tsirpanis, @elachlan we're keeping all System.Drawing issues here as our team owns the full namespace.