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Merge pull request #802 from pgiraud/pinch_preserve_center_

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Pinch preserve center
This commit is contained in:
Pierre GIRAUD
2012-12-18 00:20:18 -08:00
parent c9fa5aabad d0c85850f5
commit b404ca0a7a
2 changed files with 64 additions and 3 deletions
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20
lib/OpenLayers/Control/PinchZoom.js
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@@ -40,6 +40,17 @@ OpenLayers.Control.PinchZoom = OpenLayers.Class(OpenLayers.Control, {
* true.
*/
autoActivate: true,
/**
* APIProperty: preserveCenter
* {Boolean} Set this to true if you don't want the map center to change
* while pinching. For example you may want to set preserveCenter to
* true when the user location is being watched and you want to preserve
* the user location at the center of the map even if he zooms in or
* out using pinch. This property's value can be changed any time on an
* existing instance. Default is false.
*/
preserveCenter: false,
/**
* APIProperty: handlerOptions
@@ -73,8 +84,10 @@ OpenLayers.Control.PinchZoom = OpenLayers.Class(OpenLayers.Control, {
* of the pinch gesture. This give us the current scale of the pinch.
*/
pinchStart: function(evt, pinchData) {
this.pinchOrigin = evt.xy;
this.currentCenter = evt.xy;
var xy = (this.preserveCenter) ?
this.map.getPixelFromLonLat(this.map.getCenter()) : evt.xy;
this.pinchOrigin = xy;
this.currentCenter = xy;
},
/**
@@ -89,7 +102,8 @@ OpenLayers.Control.PinchZoom = OpenLayers.Class(OpenLayers.Control, {
var scale = pinchData.scale;
var containerOrigin = this.map.layerContainerOriginPx;
var pinchOrigin = this.pinchOrigin;
var current = evt.xy;
var current = (this.preserveCenter) ?
this.map.getPixelFromLonLat(this.map.getCenter()) : evt.xy;
var dx = Math.round((current.x - pinchOrigin.x) + (scale - 1) * (containerOrigin.x - pinchOrigin.x));
var dy = Math.round((current.y - pinchOrigin.y) + (scale - 1) * (containerOrigin.y - pinchOrigin.y));