61 lines
1.4 KiB
JavaScript
61 lines
1.4 KiB
JavaScript
goog.provide('ol.interaction.AltDragRotate');
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goog.require('ol.MapBrowserEvent');
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goog.require('ol.interaction.Drag');
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/**
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* @constructor
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* @extends {ol.interaction.Drag}
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* @param {ol.interaction.Constraints} constraints Constraints.
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*/
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ol.interaction.AltDragRotate = function(constraints) {
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goog.base(this, constraints);
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/**
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* @private
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* @type {number}
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*/
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this.startRotation_ = 0;
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};
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goog.inherits(ol.interaction.AltDragRotate, ol.interaction.Drag);
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/**
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* @inheritDoc
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*/
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ol.interaction.AltDragRotate.prototype.handleDrag = function(mapBrowserEvent) {
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var browserEvent = mapBrowserEvent.browserEvent;
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var map = mapBrowserEvent.map;
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var size = map.getSize();
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var theta = Math.atan2(
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size.height / 2 - browserEvent.offsetY,
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browserEvent.offsetX - size.width / 2);
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this.rotate(map, this.startRotation_, -theta);
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};
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/**
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* @inheritDoc
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*/
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ol.interaction.AltDragRotate.prototype.handleDragStart =
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function(mapBrowserEvent) {
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var browserEvent = mapBrowserEvent.browserEvent;
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var map = mapBrowserEvent.map;
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if (browserEvent.isMouseActionButton() && browserEvent.altKey &&
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map.canRotate()) {
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var size = map.getSize();
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var theta = Math.atan2(
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size.height / 2 - browserEvent.offsetY,
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browserEvent.offsetX - size.width / 2);
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this.startRotation_ = (map.getRotation() || 0) + theta;
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browserEvent.preventDefault();
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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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