Snaplines

Snaplines provide visual cues to allow your users to fine-tune their layouts. When two edges are in proximity a snapline is shown, or when the center of some vertex is in proximity with the edge(s) of some other vertex/vertices. When the two objects are aligned exactly, an additional class is written to the snapline, allowing you to provide your users with a visual cue.

Instantiation

Snaplines can be specified in the plugins of the render options for some surface:

<script>
  import { SurfaceComponent } from "@visuallyjs/browser-ui-svelte"
  import { SnaplinesPlugin } from "@visuallyjs/browser-ui"
  const renderOptions = {
  plugins: [
    {
      type: "snaplines",
      options: {}
    }
  ]
}
</script>

<SurfaceComponent {renderOptions}/>

Configuration

SnaplinesPluginOptions

Options for the SnaplinesPlugin

Name	Type	Description
enabled?	boolean	Defaults to true. If false, you can start the plugin in disabled mode.
showCenters?	boolean	Whether or not to show center snaplines. Defaults to true.
showEdges?	boolean	Whether or not to show edge snaplines. Defaults to true.
tolerance?	number	The tolerance either side of a snapline inside which an element must be before the snapline is activated. Defaults to 10 pixels (either side of the line).

Enable/disable

You can switch the snaplines plugin on and off via its setEnabled(..) method. To do this, you need to get a reference to the plugin and then call the method:

const snaplinesPlugin = surface.getPlugin(SnaplinesPlugin.type)
snaplinesPlugin.setEnabled(false)

CSS Classes

Snaplines are drawn as DIV elements, and several CSS classes are exposed to allow you to control their appearance.

Class	Description
vjs-snapline	Assigned to both horizontal and vertical snaplines when active
vjs-snapline-active	Assigned to an element attached to an active snapline
vjs-snapline-active-exact	Assigned to an element attached to an active snapline and the elements on the snapline are exactly aligned (parsed to integers).
vjs-snapline-exact	Assigned to both horizontal and vertical snaplines when the elements are exactly aligned
vjs-snapline-horizontal	Assigned to horizontal snaplines when active
vjs-snapline-vertical	Assigned to vertical snaplines when active

Options

SnaplinesPluginOptions

Options for the SnaplinesPlugin

Name	Type	Description
enabled?	boolean	Defaults to true. If false, you can start the plugin in disabled mode.
showCenters?	boolean	Whether or not to show center snaplines. Defaults to true.
showEdges?	boolean	Whether or not to show edge snaplines. Defaults to true.
tolerance?	number	The tolerance either side of a snapline inside which an element must be before the snapline is activated. Defaults to 10 pixels (either side of the line).