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
90 lines
2.4 KiB
JavaScript
90 lines
2.4 KiB
JavaScript
/* Copyright (c) 2006 MetaCarta, Inc., published under a modified BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/repository-license.txt
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* for the full text of the license. */
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/**
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* @requires OpenLayers/Util.js
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* @requires OpenLayers/Style.js
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*
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* Class: OpenLayers.Rule
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*
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* This class represents a OGC Rule, as being used for rule-based SLD styling
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*/
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OpenLayers.Rule = OpenLayers.Class({
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/**
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* APIProperty: name
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* {String} name of this rule
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*/
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name: 'default',
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/**
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* Property: symbolizer
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* {Object} Hash of styles for this rule. Contains hashes of feature
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* styles. Keys are one or more of ["Point", "Line", "Polygon"]
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*/
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symbolizer: null,
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/**
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* APIProperty: minScale
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* {Number} or {String} minimum scale at which to draw the feature.
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* In the case of a String, this can be a combination of text and
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* propertyNames in the form "literal ${propertyName}"
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*/
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minScale: null,
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/**
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* APIProperty: maxScale
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* {Number} or {String} maximum scale at which to draw the feature.
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* In the case of a String, this can be a combination of text and
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* propertyNames in the form "literal ${propertyName}"
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*/
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maxScale: null,
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/**
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* Constructor: OpenLayers.Rule
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* Creates a Rule.
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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.symbolizer = {};
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OpenLayers.Util.extend(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 in this.symbolizer) {
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this.symbolizer[i] = null;
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}
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this.symbolizer = null;
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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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* This rule is the default rule and always returns true.
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*/
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evaluate: function(feature) {
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// Default rule always applies. Subclasses will want to override this.
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return true;
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},
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CLASS_NAME: "OpenLayers.Rule"
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}); |