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    • com.googlecode.blaisemath.graph.StaticGraphLayout Maven / Gradle / Ivy

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    /*
 * StaticGraphLayout.java
 * Created May 13, 2010
 */
package com.googlecode.blaisemath.graph;

/*
 * #%L
 * BlaiseGraphTheory
 * --
 * Copyright (C) 2009 - 2016 Elisha Peterson
 * --
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

import com.google.common.collect.Maps;
import java.awt.geom.Point2D;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 * 
    
 *   This interface provides methods necessary to layout a graph.
 * 
    
 *
 * @param 
     object describing layout parameters
 * 
 * @author Elisha Peterson
 */
public interface StaticGraphLayout
     {

    /**
     * Return the object type for layout parameters
     * @return object type
     */
    Class
     getParametersType();

    /**
     * Perform layout on given graph, and return result.
     * @param g a graph written in terms of adjacencies
     * @param ic initial conditions
     * @param fixed nodes whose positions should be fixed
     * @param parameters parameters for the layout, e.g. radius
     * @return a mapping of points to vertices
     * @param  graph node type
     */
     Map layout(Graph g, Map ic, 
            Set fixed, P parameters);

    /**
     * Puts vertices all at the origin.
     */
    public static StaticGraphLayout ORIGIN = new StaticGraphLayout() {
        @Override
        public String toString() {
            return "Position nodes at origin";
        }
        @Override
        public Class getParametersType() {
            return Object.class;
        }
        @Override
        public Map layout(Graph g, Map ic, Set fixed, Object parameters) {
            HashMap result = Maps.newHashMap();
            for (Object v : g.nodes()) {
                result.put(v, new Point2D.Double());
            }
            return result;
        }
    };

    /** Lays out vertices uniformly around a circle (radius corresponds to first parameter). */
    public static StaticGraphLayout CIRCLE = new StaticGraphLayout() {
        @Override
        public String toString() {
            return "Position nodes in a circle";
        }
        @Override
        public Class getParametersType() {
            return Double.class;
        }
        @Override
        public Map layout(Graph g, Map ic, Set fixed, Double radius) {
            HashMap result = Maps.newHashMap();
            int size = g.nodeCount();
            int i = 0;
            for (Object v : g.nodes()) {
                result.put(v, new Point2D.Double(
                        radius * Math.cos(2 * Math.PI * i / size), 
                        radius * Math.sin(2 * Math.PI * i / size)));
                i++;
            }
            return result;
        }
    };
    /**
     * Lays out vertices at random positions within a square (size corresponds
     * to first parameter).
     */
    public static StaticGraphLayout RANDOM = new StaticGraphLayout() {
        @Override
        public String toString() {
            return "Position nodes randomly in a rectangle";
        }
        @Override
        public Class getParametersType() {
            return Double.class;
        }
        @Override
        public Map layout(Graph g, Map ic, Set fixed, Double boxSize) {
            HashMap result = Maps.newHashMap();
            for (Object v : g.nodes()) {
                result.put(v, new Point2D.Double(
                        boxSize * (2 * Math.random() - 1), 
                        boxSize * (2 * Math.random() - 1)));
            }
            return result;
        }
    };
}
    
    
    
    

    




    
    
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