90 lines
2.1 KiB
JavaScript
90 lines
2.1 KiB
JavaScript
// FIXME works for View2D only
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goog.provide('ol.interaction.DragRotateAndZoom');
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goog.require('goog.asserts');
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goog.require('goog.math.Vec2');
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goog.require('ol.View2D');
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goog.require('ol.interaction.ConditionType');
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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.ConditionType} condition Condition.
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*/
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ol.interaction.DragRotateAndZoom = function(condition) {
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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_ = condition;
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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_;
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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.lastMagnitude_;
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};
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goog.inherits(ol.interaction.DragRotateAndZoom, ol.interaction.Drag);
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/**
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* @inheritDoc
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*/
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ol.interaction.DragRotateAndZoom.prototype.handleDrag =
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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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var size = map.getSize();
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var delta = new goog.math.Vec2(
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browserEvent.offsetX - size.width / 2,
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size.height / 2 - browserEvent.offsetY);
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var theta = Math.atan2(delta.y, delta.x);
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var magnitude = delta.magnitude();
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// FIXME works for View2D only
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var view = map.getView();
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goog.asserts.assert(view instanceof ol.View2D);
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map.requestRenderFrame();
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// FIXME the calls to map.rotate and map.zoomToResolution should use
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// map.withFrozenRendering but an assertion fails :-(
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if (goog.isDef(this.lastAngle_)) {
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var angleDelta = theta - this.lastAngle_;
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view.rotate(map, view.getRotation() - angleDelta);
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}
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this.lastAngle_ = theta;
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if (goog.isDef(this.lastMagnitude_)) {
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var resolution = this.lastMagnitude_ * (view.getResolution() / magnitude);
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view.zoom(map, resolution);
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}
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this.lastMagnitude_ = magnitude;
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};
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/**
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* @inheritDoc
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*/
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ol.interaction.DragRotateAndZoom.prototype.handleDragStart =
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function(mapBrowserEvent) {
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var browserEvent = mapBrowserEvent.browserEvent;
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if (this.condition_(browserEvent)) {
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this.lastAngle_ = undefined;
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this.lastMagnitude_ = 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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