fb3c02354f
that Andreas has been working so hard on. I think this is the single most awesome commit I've ever had the pleasure of committing. The results of this commit are described on http://trac.openlayers.org/wiki/Styles: essentially, this makes it possible to style features in all kinds of fun ways based on rules, and will also form the underlying basis for #533. Things this patch adds: * OL.Rule classes. These classes allow you to do tests against the propertie of a feature, and set a style based on these properties -- so you can compare the 'speedlimit' property of a line, and test if it is > 60, and if it is greater than 60, render it in a different color. You can also test combinations of rules using the OL.Rule.Logical class, and test featureids with the FeatureID class. * OL.Style class: The OL.Style class lets you wrap up Rules into styles that can be used with drawFeature to draw the feature in the selected style. * OL.Layer.Vector.drawFeature will check if the given style is an OL.Style object, and if so, it will draw the feature accordingly. examples/georss-flickr.html shows usage of these classes. Many, many thanks go to Andreas for all his hard work on this: this code really is very pretty, and includes unit tests for all the classes (and we know that I am a big fan of tests.) Three cheers for Andreas: Hip hip, hooray! hip hip, hooray! hip hip, hooray! git-svn-id: http://svn.openlayers.org/trunk/openlayers@5429 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
102 lines
2.8 KiB
JavaScript
102 lines
2.8 KiB
JavaScript
/* Copyright (c) 2006-2007 MetaCarta, Inc., published under the Clear BSD
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* license. See http://svn.openlayers.org/trunk/openlayers/license.txt for the
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* full text of the license. */
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/**
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* @requires: OpenLayers/Rule.js
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*
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* Class: OpenLayers.Rule.Logical
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*
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* This class represents ogc:And, ogc:Or and ogc:Not rules.
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*
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* Inherits from
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* - <OpenLayers.Rule>
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*/
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OpenLayers.Rule.Logical = OpenLayers.Class(OpenLayers.Rule, {
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/**
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* APIProperty: children
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* {Array(<OpenLayers.Rule>)} child rules for this rule
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*/
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children: null,
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/**
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* APIProperty: type
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* {String} type of logical operator. Available types are:
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* - OpenLayers.Rule.Locical.AND = "&&";
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* - OpenLayers.Rule.Logical.OR = "||";
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* - OpenLayers.Rule.Logical.NOT = "!";
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*/
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type: null,
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/**
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* Constructor: OpenLayers.Rule.Logical
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* Creates a logical rule (And, Or, Not).
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*
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* Parameters:
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* options - {Object} An optional object with properties to set on the
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* rule
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*
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* Returns:
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* {<OpenLayers.Rule>}
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*/
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initialize: function(options) {
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this.children = [];
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OpenLayers.Rule.prototype.initialize.apply(
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this, [options]);
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},
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/**
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* APIMethod: destroy
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* nullify references to prevent circular references and memory leaks
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*/
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destroy: function() {
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for (var i=0; i<this.children.length; i++) {
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this.children[i].destroy();
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}
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this.children = null;
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OpenLayers.Rule.prototype.destroy.apply(this, arguments);
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},
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/**
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* APIMethod: evaluate
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* evaluates this rule for a specific feature
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*
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* Parameters:
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* feature - {<OpenLayers.Feature>} feature to apply the rule to.
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*
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* Returns:
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* {boolean} true if the rule applies, false if it does not
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*/
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evaluate: function(feature) {
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switch(this.type) {
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case OpenLayers.Rule.Logical.AND:
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for (var i=0; i<this.children.length; i++) {
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if (this.children[i].evaluate(feature) == false) {
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return false;
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}
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}
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return true;
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case OpenLayers.Rule.Logical.OR:
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for (var i=0; i<this.children.length; i++) {
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if (this.children[i].evaluate(feature) == true) {
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return true;
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}
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}
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return false;
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case OpenLayers.Rule.Logical.NOT:
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return (!this.children[0].evaluate(feature));
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}
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},
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CLASS_NAME: "OpenLayers.Rule.Logical"
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});
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OpenLayers.Rule.Logical.AND = "&&";
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OpenLayers.Rule.Logical.OR = "||";
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OpenLayers.Rule.Logical.NOT = "!";
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