Pageimage::focus() method

Get or set focus area for crops to use

These settings are used by $this->size() calls that specify BOTH width AND height. Focus helps to ensure that the important subject of the photo is not cropped out when the requested size proportion differs from the original image proportion. For example, not chopping off someone’s head in a photo.

Default behavior is to return an array containing "top" and "left" indexes, representing percentages from top and left. When arguments are specified, you are either setting the top/left percentages, or unsetting focus, or getting focus in different ways, described in arguments below.

A zoom argument/property is also present here for future use, but not currently supported.

Usage

// basic usage
$array = $pageimage->focus();

// usage with all arguments
$array = $pageimage->focus($top = null, $left = null, $zoom = null);

Arguments

NameType(s)Description
top (optional)null, float, int, array, false

Omit to get focus array, or specify one of the following:

  • GET: Omit all arguments to get focus array (default behavior).
  • GET: Specify boolean TRUE to return TRUE if focus data is present or FALSE if not.
  • GET: Specify integer 1 to make this method return pixel dimensions rather than percentages.
  • SET: Specify both $top and $left arguments to set (values assumed to be percentages).
  • SET: Specify array containing "top" and "left" indexes to set (percentages).
  • SET: Specify array where index 0 is top and index 1 is left (percentages).
  • SET: Specify string in the format "top left", i.e. "25 70" or "top left zoom", i.e. "25 70 30" (percentages).
  • SET: Specify CSV key=value string in the format "top=25%, left=70%, zoom=30%" in any order
  • UNSET: Specify boolean false to remove any focus values.
left (optional)null, float, int

Set left value (when $top value is float|int)

  • This argument is only used when setting focus and should be omitted otherwise.
zoom (optional)null, int

Zoom percent (not currently supported)

Return value

array bool Pageimage

Returns one of the following:

  • When getting returns array containing top, left and default properties.
  • When TRUE was specified for the $top argument, it returns either TRUE (has focus) or FALSE (does not have).
  • When setting or unsetting returns $this.

Pageimage methods and properties

API reference based on ProcessWire core version 3.0.137

Twitter updates

  • We added WebP image support this year and many have been adopting it in existing projects. We look at a process used for migrating existing websites to WebP images— from preliminary considerations to implementation & testing, w/lots of tips & tricks too: More
    16 August 2019
  • Core version 3.0.137 on the dev branch adds the ability to hook multiple methods at once, in a single call. This post details how it works and provides a useful example of how you might put it to use in your development environment— More
    2 August 2019
  • ProcessWire 3.0.136 updates our CKEditor version and adds a new backtrace() method to the core Debug class— More
    26 July 2019

Latest news

  • ProcessWire Weekly #275
    In the 275th issue of ProcessWire Weekly we're going to walk you through the new features included in ProcessWire 3.0.138, cover some WebP related stuff, and highlight recent forum posts and online resources. Read on!
    Weekly.pw / 17 August 2019
  • WebP images on an existing site
    In this post we’ll look at a process used for migrating an existing website to use WebP images. We’ll cover everything from preliminary considerations to implementation and testing, with lots of tips and tricks along the way.
    Blog / 16 August 2019
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