98 lines
2.5 KiB
JavaScript
98 lines
2.5 KiB
JavaScript
goog.provide('ol.interaction.DragRotate');
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goog.require('goog.asserts');
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goog.require('ol.interaction.ConditionType');
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goog.require('ol.interaction.Drag');
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goog.require('ol.interaction.Interaction');
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goog.require('ol.interaction.condition');
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/**
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* @define {number} Animation duration.
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*/
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ol.interaction.DRAGROTATE_ANIMATION_DURATION = 250;
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/**
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* Allows the user to rotate the map by clicking and dragging on the map,
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* normally combined with an {@link ol.interaction.condition} that limits
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* it to when the alt and shift keys are held down.
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* @constructor
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* @extends {ol.interaction.Drag}
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* @param {ol.interaction.DragRotateOptions=} opt_options Options.
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*/
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ol.interaction.DragRotate = function(opt_options) {
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var options = goog.isDef(opt_options) ? opt_options : {};
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goog.base(this);
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/**
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* @private
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* @type {ol.interaction.ConditionType}
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*/
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this.condition_ = goog.isDef(options.condition) ?
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options.condition : ol.interaction.condition.altShiftKeysOnly;
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/**
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* @private
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* @type {number|undefined}
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*/
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this.lastAngle_ = undefined;
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};
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goog.inherits(ol.interaction.DragRotate, ol.interaction.Drag);
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/**
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* @inheritDoc
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*/
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ol.interaction.DragRotate.prototype.handleDrag = function(mapBrowserEvent) {
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var map = mapBrowserEvent.map;
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var size = map.getSize();
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var offset = mapBrowserEvent.getPixel();
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var theta =
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Math.atan2(size[1] / 2 - offset[1], offset[0] - size[0] / 2);
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if (goog.isDef(this.lastAngle_)) {
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var delta = theta - this.lastAngle_;
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// FIXME works for View2D only
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var view = map.getView().getView2D();
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var view2DState = view.getView2DState();
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map.requestRenderFrame();
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ol.interaction.Interaction.rotateWithoutConstraints(
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map, view, view2DState.rotation - delta);
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}
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this.lastAngle_ = theta;
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};
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/**
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* @inheritDoc
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*/
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ol.interaction.DragRotate.prototype.handleDragEnd = function(mapBrowserEvent) {
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var map = mapBrowserEvent.map;
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// FIXME works for View2D only
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var view = map.getView().getView2D();
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var view2DState = view.getView2DState();
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ol.interaction.Interaction.rotate(map, view, view2DState.rotation, undefined,
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ol.interaction.DRAGROTATE_ANIMATION_DURATION);
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};
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/**
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* @inheritDoc
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*/
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ol.interaction.DragRotate.prototype.handleDragStart =
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function(mapBrowserEvent) {
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var browserEvent = mapBrowserEvent.browserEvent;
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if (browserEvent.isMouseActionButton() && this.condition_(mapBrowserEvent)) {
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var map = mapBrowserEvent.map;
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map.requestRenderFrame();
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this.lastAngle_ = undefined;
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return true;
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} else {
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return false;
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}
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};
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