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add an option to make the pinchZoom constrain zoom levels to integers

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Changes the default behavior of ol.interaction.PinchZoom to keep
the fractional zoom level after the gesture.
The old behavior of zooming to the next whole-number level can be
enforced with the new parameter `constrainResolution`.
This commit is contained in:
Axel Utech
2016-12-09 18:02:36 +01:00
parent f795019215
commit 321b1f72ad
2 changed files with 23 additions and 8 deletions
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22
src/ol/interaction/pinchzoom.js
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@@ -27,6 +27,12 @@ ol.interaction.PinchZoom = function(opt_options) {
var options = opt_options ? opt_options : {};
/**
* @private
* @type {boolean}
*/
this.constrainResolution_ = options.constrainResolution || false;
/**
* @private
* @type {ol.Coordinate}
@@ -111,13 +117,15 @@ ol.interaction.PinchZoom.handleUpEvent_ = function(mapBrowserEvent) {
var map = mapBrowserEvent.map;
var view = map.getView();
view.setHint(ol.View.Hint.INTERACTING, -1);
var resolution = view.getResolution();
// Zoom to final resolution, with an animation, and provide a
// direction not to zoom out/in if user was pinching in/out.
// Direction is > 0 if pinching out, and < 0 if pinching in.
var direction = this.lastScaleDelta_ - 1;
ol.interaction.Interaction.zoom(map, view, resolution,
this.anchor_, this.duration_, direction);
if (this.constrainResolution_) {
var resolution = view.getResolution();
// Zoom to final resolution, with an animation, and provide a
// direction not to zoom out/in if user was pinching in/out.
// Direction is > 0 if pinching out, and < 0 if pinching in.
var direction = this.lastScaleDelta_ - 1;
ol.interaction.Interaction.zoom(map, view, resolution,
this.anchor_, this.duration_, direction);
}
return false;
} else {
return true;