24200f73d8
git-svn-id: http://svn.openlayers.org/tags/openlayers/release-2.5-rc3@4433 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
124 lines
4.0 KiB
JavaScript
124 lines
4.0 KiB
JavaScript
/* Copyright (c) 2006-2007 MetaCarta, Inc., published under the BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/release-license.txt
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* for the full text of the license. */
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/**
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* @requires OpenLayers/Handler/Path.js
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* @requires OpenLayers/Geometry/Polygon.js
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*
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* Class: OpenLayers.Handler.Polygon
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* Handler to draw a polygon on the map. Polygon is displayed on mouse down,
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* moves on mouse move, and is finished on mouse up.
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*
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* Inherits from:
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* - <OpenLayers.Handler.Path>
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* - <OpenLayers.Handler>
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*/
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OpenLayers.Handler.Polygon = OpenLayers.Class(OpenLayers.Handler.Path, {
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/**
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* Parameter: polygon
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* {<OpenLayers.Feature.Vector>}
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*/
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polygon: null,
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/**
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* Constructor: OpenLayers.Handler.Polygon
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* Create a Polygon Handler.
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*
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* Parameters:
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* control - {<OpenLayers.Control>}
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* callbacks - {Object} An object with a 'done' property whos value is
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* a function to be called when the path drawing is
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* finished. The callback should expect to recieve a
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* single argument, the polygon geometry.
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* If the callbacks object contains a 'point'
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* property, this function will be sent each point
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* as they are added. If the callbacks object contains
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* a 'cancel' property, this function will be called when
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* the handler is deactivated while drawing. The cancel
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* should expect to receive a geometry.
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* options - {Object}
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*/
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initialize: function(control, callbacks, options) {
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OpenLayers.Handler.Path.prototype.initialize.apply(this, arguments);
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},
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/**
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* Method: createFeature
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* Add temporary geometries
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*/
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createFeature: function() {
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this.polygon = new OpenLayers.Feature.Vector(
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new OpenLayers.Geometry.Polygon());
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this.line = new OpenLayers.Feature.Vector(
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new OpenLayers.Geometry.LinearRing());
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this.polygon.geometry.addComponent(this.line.geometry);
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this.point = new OpenLayers.Feature.Vector(
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new OpenLayers.Geometry.Point());
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},
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/**
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* Method: destroyFeature
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* Destroy temporary geometries
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*/
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destroyFeature: function() {
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OpenLayers.Handler.Path.prototype.destroyFeature.apply(this);
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this.polygon.destroy();
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this.polygon = null;
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},
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/**
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* Method: modifyFeature
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* Modify the existing geometry given the new point
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*
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*/
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modifyFeature: function() {
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var index = this.line.geometry.components.length - 2;
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this.line.geometry.components[index].x = this.point.geometry.x;
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this.line.geometry.components[index].y = this.point.geometry.y;
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this.line.geometry.components[index].clearBounds();
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},
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/**
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* Method: drawFeature
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* Render geometries on the temporary layer.
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*/
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drawFeature: function() {
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this.layer.drawFeature(this.polygon, this.style);
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this.layer.drawFeature(this.point, this.style);
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},
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/**
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* Method: geometryClone
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* Return a clone of the relevant geometry.
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*
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* Returns:
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* {<OpenLayers.Geometry.Polygon>}
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*/
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geometryClone: function() {
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return this.polygon.geometry.clone();
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},
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/**
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* Method: dblclick
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* Handle double-clicks. Finish the geometry and send it back
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* to the control.
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*
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* Parameters:
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* evt - {Event}
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*/
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dblclick: function(evt) {
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if(!this.freehandMode(evt)) {
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// remove the penultimate point
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var index = this.line.geometry.components.length - 2;
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this.line.geometry.removeComponent(this.line.geometry.components[index]);
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this.finalize();
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}
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return false;
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},
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CLASS_NAME: "OpenLayers.Handler.Polygon"
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});
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