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Panzoom是一个渐进的插件来创建元素的平移和缩放功能。 panzoom需要jquery1.9.0+或jQuery2.0+。IE<=8不支持。Panzoom支持包括iOS和Android的触摸手势，甚至支持捏缩放手势。它非常适合用于移动和桌面浏览器。Panzoom支持直接在浏览器平移和缩放SVG元素。

加载Panzoom

<script src="//ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script src="/js/plugins/jquery.panzoom.js"></script>

  或AMD方式

define([ "jquery", "plugins/jquery.panzoom" ], function( $ ) {
  $(document).ready(function() {
    $(".panzoom-elements").panzoom();
  });
});

Panzoom使用

$(".panzoom-elements").panzoom();

// Pass options
$("a.panzoom-elements").panzoom({
  minScale: 0,
  $zoomRange: $("input[type='range']")
});

Panzoom选项

Panzoom.defaults = {
  // Should always be non-empty
  // Used to bind jQuery events without collisions
  // A guid is not added here as different instantiations/versions of Panzoom
  // on the same element is not supported.
  eventNamespace: ".panzoom",

  // Whether or not to transition the scale
  transition: true,

  // Default cursor style for the element
  cursor: "move",

  // There may be some use cases for zooming without panning or vice versa
  // NOTE: disablePan also disables focal point zooming
  disablePan: false,
  disableZoom: false,

  // Pan only on the X or Y axes
  disableXAxis: false,
  disableYAxis: false,

  // Set whether you'd like to pan on left (1), middle (2), or right click (3)
  which: 1,

  // The increment at which to zoom
  // Should be a number greater than 0
  increment: 0.3,

  // When no scale is passed, this option tells
  // the `zoom` method to increment
  // the scale *linearly* based on the increment option.
  // This often ends up looking like very little happened at larger zoom levels.
  // The default is to multiply/divide the scale based on the increment.
  linearZoom: false,

  // Pan only when the scale is greater than minScale
  panOnlyWhenZoomed: false,

  // min and max zoom scales
  minScale: 0.4,
  maxScale: 5,

  // The default step for the range input
  // Precendence: default < html attribute < option setting
  rangeStep: 0.05,

  // Animation duration (ms)
  duration: 200,
  // css easing used for scale transition
  easing: "ease-in-out",

  // Indicate that the element should be contained within its parent when panning
  // Note: this does not affect zooming outside of the parent
  // Set this value to 'invert' to only allow panning outside of the parent element (the opposite of the normal use of contain)
  // 'invert' is useful for a large Panzoom element where you don't want to show anything behind it
  contain: false,

  // Transform value to which to always reset (string)
  // Defaults to the original transform on the element when Panzoom is initialized
  startTransform: undefined,

  // This optional jQuery collection can be set to specify all of the elements
  // on which the transform should always be set.
  // It should have at least one element.
  // This is mainly used for delegating the pan and zoom transform settings
  // to another element or multiple elements.
  // The default is the Panzoom element wrapped in jQuery
  // See the [demo](http://timmywil.github.io/jquery.panzoom/demo/#set) for an example.
  // Note: only one Panzoom element will still handle events for a Panzoom instance.
  // Use multiple Panzoom instances for that use case.
  $set: $elem,

  // Zoom buttons/links collection (you can also bind these yourself - e.g. `$button.on("click", function( e ) { e.preventDefault(); $elem.panzoom("zoom"); });` )
  $zoomIn: $(),
  $zoomOut: $(),
  // Range input on which to bind zooming functionality
  $zoomRange: $(),
  // Reset buttons/links collection on which to bind the reset method
  $reset: $(),
  // For convenience, these options will be bound to Panzoom events
  // These can all be bound normally on the Panzoom element
  // e.g. `$elem.on("panzoomend", function( e, panzoom ) { console.log( panzoom.getMatrix() ); });`
  onStart: undefined,
  onChange: undefined,
  onZoom: undefined,
  onPan: undefined,
  onEnd: undefined,
  onReset: undefined
};

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