openlayers
Version:
Build tools and sources for developing OpenLayers based mapping applications
171 lines (144 loc) • 4.29 kB
JavaScript
goog.provide('ol.interaction.PinchRotate');
goog.require('ol');
goog.require('ol.View');
goog.require('ol.functions');
goog.require('ol.interaction.Interaction');
goog.require('ol.interaction.Pointer');
/**
* @classdesc
* Allows the user to rotate the map by twisting with two fingers
* on a touch screen.
*
* @constructor
* @extends {ol.interaction.Pointer}
* @param {olx.interaction.PinchRotateOptions=} opt_options Options.
* @api stable
*/
ol.interaction.PinchRotate = function(opt_options) {
ol.interaction.Pointer.call(this, {
handleDownEvent: ol.interaction.PinchRotate.handleDownEvent_,
handleDragEvent: ol.interaction.PinchRotate.handleDragEvent_,
handleUpEvent: ol.interaction.PinchRotate.handleUpEvent_
});
var options = opt_options || {};
/**
* @private
* @type {ol.Coordinate}
*/
this.anchor_ = null;
/**
* @private
* @type {number|undefined}
*/
this.lastAngle_ = undefined;
/**
* @private
* @type {boolean}
*/
this.rotating_ = false;
/**
* @private
* @type {number}
*/
this.rotationDelta_ = 0.0;
/**
* @private
* @type {number}
*/
this.threshold_ = options.threshold !== undefined ? options.threshold : 0.3;
/**
* @private
* @type {number}
*/
this.duration_ = options.duration !== undefined ? options.duration : 250;
};
ol.inherits(ol.interaction.PinchRotate, ol.interaction.Pointer);
/**
* @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
* @this {ol.interaction.PinchRotate}
* @private
*/
ol.interaction.PinchRotate.handleDragEvent_ = function(mapBrowserEvent) {
ol.DEBUG && console.assert(this.targetPointers.length >= 2,
'length of this.targetPointers should be greater than or equal to 2');
var rotationDelta = 0.0;
var touch0 = this.targetPointers[0];
var touch1 = this.targetPointers[1];
// angle between touches
var angle = Math.atan2(
touch1.clientY - touch0.clientY,
touch1.clientX - touch0.clientX);
if (this.lastAngle_ !== undefined) {
var delta = angle - this.lastAngle_;
this.rotationDelta_ += delta;
if (!this.rotating_ &&
Math.abs(this.rotationDelta_) > this.threshold_) {
this.rotating_ = true;
}
rotationDelta = delta;
}
this.lastAngle_ = angle;
var map = mapBrowserEvent.map;
// rotate anchor point.
// FIXME: should be the intersection point between the lines:
// touch0,touch1 and previousTouch0,previousTouch1
var viewportPosition = map.getViewport().getBoundingClientRect();
var centroid = ol.interaction.Pointer.centroid(this.targetPointers);
centroid[0] -= viewportPosition.left;
centroid[1] -= viewportPosition.top;
this.anchor_ = map.getCoordinateFromPixel(centroid);
// rotate
if (this.rotating_) {
var view = map.getView();
var rotation = view.getRotation();
map.render();
ol.interaction.Interaction.rotateWithoutConstraints(map, view,
rotation + rotationDelta, this.anchor_);
}
};
/**
* @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
* @return {boolean} Stop drag sequence?
* @this {ol.interaction.PinchRotate}
* @private
*/
ol.interaction.PinchRotate.handleUpEvent_ = function(mapBrowserEvent) {
if (this.targetPointers.length < 2) {
var map = mapBrowserEvent.map;
var view = map.getView();
view.setHint(ol.View.Hint.INTERACTING, -1);
if (this.rotating_) {
var rotation = view.getRotation();
ol.interaction.Interaction.rotate(
map, view, rotation, this.anchor_, this.duration_);
}
return false;
} else {
return true;
}
};
/**
* @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
* @return {boolean} Start drag sequence?
* @this {ol.interaction.PinchRotate}
* @private
*/
ol.interaction.PinchRotate.handleDownEvent_ = function(mapBrowserEvent) {
if (this.targetPointers.length >= 2) {
var map = mapBrowserEvent.map;
this.anchor_ = null;
this.lastAngle_ = undefined;
this.rotating_ = false;
this.rotationDelta_ = 0.0;
if (!this.handlingDownUpSequence) {
map.getView().setHint(ol.View.Hint.INTERACTING, 1);
}
return true;
} else {
return false;
}
};
/**
* @inheritDoc
*/
ol.interaction.PinchRotate.prototype.shouldStopEvent = ol.functions.FALSE;