Draw interaction
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Tim Schaub
286
src/ol/interaction/drawinteraction.js
Normal file
286
src/ol/interaction/drawinteraction.js
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goog.provide('ol.interaction.Draw');
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goog.provide('ol.interaction.DrawMode');
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goog.require('goog.asserts');
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goog.require('ol.Coordinate');
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goog.require('ol.Feature');
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goog.require('ol.Map');
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goog.require('ol.MapBrowserEvent');
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goog.require('ol.MapBrowserEvent.EventType');
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goog.require('ol.geom.LineString');
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goog.require('ol.geom.Point');
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goog.require('ol.geom.Polygon');
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goog.require('ol.interaction.Interaction');
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goog.require('ol.layer.Vector');
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goog.require('ol.layer.VectorLayerRenderIntent');
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goog.require('ol.source.Vector');
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/**
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* Interaction that allows drawing geometries.
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* @param {ol.interaction.DrawOptions} options Options.
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* @constructor
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* @extends {ol.interaction.Interaction}
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*/
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ol.interaction.Draw = function(options) {
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goog.base(this);
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/**
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* Target layer for drawn features.
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* @type {ol.layer.Vector}
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* @private
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*/
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this.layer_ = options.layer;
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/**
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* Temporary sketch layer.
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* @type {ol.layer.Vector}
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* @private
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*/
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this.sketchLayer_ = null;
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/**
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* Pixel distance for snapping.
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* @type {number}
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* @private
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*/
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this.snapTolerance_ = 15;
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/**
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* Draw mode.
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* @type {ol.interaction.DrawMode}
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* @private
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*/
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this.mode_ = options.mode;
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/**
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* Start coordinate for the feature.
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* @type {ol.Coordinate}
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* @private
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*/
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this.startCoordinate_ = null;
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/**
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* Sketch feature.
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* @type {ol.Feature}
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* @private
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*/
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this.sketchFeature_ = null;
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};
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goog.inherits(ol.interaction.Draw, ol.interaction.Interaction);
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/**
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* @inheritDoc
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*/
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ol.interaction.Draw.prototype.setMap = function(map) {
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var oldMap = this.getMap();
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if (!goog.isNull(oldMap)) {
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oldMap.removeLayer(this.sketchLayer_);
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}
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if (!goog.isNull(map)) {
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if (goog.isNull(this.sketchLayer_)) {
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var layer = new ol.layer.Vector({
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source: new ol.source.Vector({parser: null}),
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style: this.layer_.getStyle()
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});
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layer.setTemporary(true);
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this.sketchLayer_ = layer;
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}
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map.addLayer(this.sketchLayer_);
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} else {
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// removing from a map, clean up
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this.sketchLayer_ = null;
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this.startCoordinate_ = null;
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this.sketchFeature_ = null;
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}
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goog.base(this, 'setMap', map);
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};
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/**
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* @inheritDoc
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*/
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ol.interaction.Draw.prototype.handleMapBrowserEvent = function(event) {
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var map = event.map;
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if (!map.isDef()) {
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return true;
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}
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var pass = true;
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if (event.type === ol.MapBrowserEvent.EventType.CLICK) {
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pass = this.handleClick_(event);
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} else if (event.type === ol.MapBrowserEvent.EventType.MOUSEMOVE) {
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pass = this.handleMove_(event);
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}
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return pass;
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};
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/**
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* Handle click events.
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* @param {ol.MapBrowserEvent} event A click event.
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* @return {boolean} Pass the event to other interactions.
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* @private
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*/
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ol.interaction.Draw.prototype.handleClick_ = function(event) {
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if (goog.isNull(this.startCoordinate_)) {
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this.startDrawing_(event);
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} else if (this.mode_ === ol.interaction.DrawMode.POINT ||
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this.atStart_(event)) {
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this.finishDrawing_(event);
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} else {
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this.addToDrawing_(event);
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}
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return false;
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};
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/**
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* Handle mousemove events.
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* @param {ol.MapBrowserEvent} event A mousemove event.
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* @return {boolean} Pass the event to other interactions.
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* @private
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*/
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ol.interaction.Draw.prototype.handleMove_ = function(event) {
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if (this.mode_ === ol.interaction.DrawMode.POINT &&
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goog.isNull(this.startCoordinate_)) {
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this.startDrawing_(event);
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} else if (!goog.isNull(this.startCoordinate_)) {
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this.modifyDrawing_(event);
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}
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return true;
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};
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/**
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* Determine if an event is within the snapping tolerance of the start coord.
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* @param {ol.MapBrowserEvent} event Event.
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* @return {boolean} The event is within the snapping tolerance of the start.
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* @private
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*/
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ol.interaction.Draw.prototype.atStart_ = function(event) {
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var map = event.map;
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var startPixel = map.getPixelFromCoordinate(this.startCoordinate_);
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var pixel = event.getPixel();
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var dx = pixel[0] - startPixel[0];
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var dy = pixel[1] - startPixel[1];
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return Math.sqrt(dx * dx + dy * dy) <= this.snapTolerance_;
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};
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/**
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* Start the drawing.
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* @param {ol.MapBrowserEvent} event Event.
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* @private
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*/
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ol.interaction.Draw.prototype.startDrawing_ = function(event) {
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var start = event.getCoordinate();
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this.startCoordinate_ = start;
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var feature = new ol.Feature();
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feature.setRenderIntent(ol.layer.VectorLayerRenderIntent.SELECTED);
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var geometry;
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if (this.mode_ === ol.interaction.DrawMode.POINT) {
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geometry = new ol.geom.Point(start.slice());
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} else if (this.mode_ === ol.interaction.DrawMode.LINESTRING) {
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geometry = new ol.geom.LineString([start.slice(), start.slice()]);
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} else if (this.mode_ === ol.interaction.DrawMode.POLYGON) {
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geometry = new ol.geom.Polygon([[start.slice(), start.slice()]]);
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}
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goog.asserts.assert(goog.isDef(geometry));
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feature.setGeometry(geometry);
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this.sketchFeature_ = feature;
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this.sketchLayer_.addFeatures([feature]);
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};
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/**
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* Modify the drawing.
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* @param {ol.MapBrowserEvent} event Event.
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* @private
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*/
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ol.interaction.Draw.prototype.modifyDrawing_ = function(event) {
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var coordinate = event.getCoordinate();
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var geometry = this.sketchFeature_.getGeometry();
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var coordinates, last;
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if (this.mode_ === ol.interaction.DrawMode.POINT) {
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last = geometry.getCoordinates();
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last[0] = coordinate[0];
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last[1] = coordinate[1];
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geometry.setCoordinates(last);
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} else if (this.mode_ === ol.interaction.DrawMode.LINESTRING) {
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coordinates = geometry.getCoordinates();
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last = coordinates[coordinates.length - 1];
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last[0] = coordinate[0];
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last[1] = coordinate[1];
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geometry.setCoordinates(coordinates);
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} else if (this.mode_ === ol.interaction.DrawMode.POLYGON) {
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var ring = geometry.getRings()[0];
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coordinates = ring.getCoordinates();
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last = coordinates[coordinates.length - 1];
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last[0] = coordinate[0];
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last[1] = coordinate[1];
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ring.setCoordinates(coordinates);
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}
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};
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/**
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* Add a new coordinate to the drawing.
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* @param {ol.MapBrowserEvent} event Event.
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* @private
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*/
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ol.interaction.Draw.prototype.addToDrawing_ = function(event) {
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var coordinate = event.getCoordinate();
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var geometry = this.sketchFeature_.getGeometry();
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var coordinates, last;
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if (this.mode_ === ol.interaction.DrawMode.LINESTRING) {
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coordinates = geometry.getCoordinates();
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coordinates.push(coordinate.slice());
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geometry.setCoordinates(coordinates);
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} else if (this.mode_ === ol.interaction.DrawMode.POLYGON) {
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var ring = geometry.getRings()[0];
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coordinates = ring.getCoordinates();
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coordinates.push(coordinate.slice());
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ring.setCoordinates(coordinates);
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}
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};
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/**
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* Finish the drawing.
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* @param {ol.MapBrowserEvent} event Event.
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* @private
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*/
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ol.interaction.Draw.prototype.finishDrawing_ = function(event) {
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this.startCoordinate_ = null;
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var feature = this.sketchFeature_;
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this.sketchLayer_.removeFeatures([feature]);
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feature.setRenderIntent(ol.layer.VectorLayerRenderIntent.DEFAULT);
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this.layer_.addFeatures([feature]);
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};
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/**
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* Set the drawing mode.
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* @param {ol.interaction.DrawMode} mode Draw mode ('point', 'linestring', or
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* 'polygon').
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*/
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ol.interaction.Draw.prototype.setMode = function(mode) {
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this.mode_ = mode;
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};
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/**
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* Draw mode.
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* @enum {string}
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*/
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ol.interaction.DrawMode = {
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POINT: 'point',
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LINESTRING: 'linestring',
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POLYGON: 'polygon'
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};
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