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Add convenience function to create a regular polygon geometryFunction

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This commit is contained in:
Andreas Hocevar
2015-05-08 11:21:16 +02:00
parent 901a0f6d8e
commit 19c91235ce
4 changed files with 77 additions and 2 deletions
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36
src/ol/interaction/drawinteraction.js
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@@ -705,6 +705,42 @@ ol.interaction.Draw.prototype.updateState_ = function() {
};
/**
* Create a `geometryFunction` for `mode: 'Circle'` that will create a regular
* polygon with a user specified number of sides and start angle instead of an
* `ol.geom.Circle` geometry.
* @param {number=} opt_sides Number of sides of the regular polygon. Default is
* 32.
* @param {number=} opt_angle Angle of the first point in radians. 0 means East.
* Default is 0.
* @return {ol.interaction.Draw.GeometryFunctionType} Function that draws a
* polygon.
* @api
*/
ol.interaction.Draw.createRegularPolygon = function(opt_sides, opt_angle) {
var sides = goog.isDef(opt_sides) ? opt_sides : 32;
var angle = goog.isDef(opt_angle) ? opt_angle : 0;
return (
/**
* @param {ol.Coordinate|Array.<ol.Coordinate>|Array.<Array.<ol.Coordinate>>} coordinates
* @param {ol.geom.SimpleGeometry=} opt_geometry
* @return {ol.geom.SimpleGeometry}
*/
function(coordinates, opt_geometry) {
var center = coordinates[0];
var radius = Math.sqrt(
ol.coordinate.squaredDistance(coordinates[0], coordinates[1]));
var geometry = goog.isDef(opt_geometry) ? opt_geometry :
ol.geom.Polygon.fromCircle(new ol.geom.Circle(center), sides);
goog.asserts.assertInstanceof(geometry, ol.geom.Polygon,
'geometry must be a polygon');
ol.geom.Polygon.makeRegular(geometry, center, radius, angle);
return geometry;
}
);
};
/**
* Get the drawing mode. The mode for mult-part geometries is the same as for
* their single-part cousins.