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# CGSize

A structure that contains width and height values.

```
struct CGSize
```

## Overview

A [`CGSize`](/documentation/CoreFoundation/CGSize) structure is sometimes used to represent a distance vector, rather than a physical size. As a vector, its values can be negative. To normalize a [`CGRect`](/documentation/CoreFoundation/CGRect) structure so that its size is represented by positive values, call the [`standardized`](/documentation/CoreFoundation/CGRect/standardized) function.

## Topics

### Geometric Properties

[`width`](/documentation/CoreFoundation/CGSize/width)

A width value.

[`height`](/documentation/CoreFoundation/CGSize/height)

A height value.

### Special Values

[`zero`](/documentation/CoreFoundation/CGSize/zero)

[`init()`](/documentation/CoreFoundation/CGSize/init())

Creates a size with zero width and height.

### Transforming Sizes

[`applying(_:)`](/documentation/CoreFoundation/CGSize/applying(_:))

### Alternate Representations

[`dictionaryRepresentation`](/documentation/CoreFoundation/CGSize/dictionaryRepresentation)

[`init(dictionaryRepresentation:)`](/documentation/CoreFoundation/CGSize/init(dictionaryRepresentation:))

[`customPlaygroundQuickLook`](/documentation/CoreFoundation/CGSize/customPlaygroundQuickLook)

A custom playground Quick Look for this instance.

### Comparing Sizes

  <doc://com.apple.documentation/documentation/CoreGraphics/CGSizeEqualToSize(_:_:)>


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