bundles/org.simantics.g2d/src/org/simantics/g2d/multileveldiagram/TransitionFunction.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.g2d.multileveldiagram;
  13
  14 import org.simantics.g2d.element.handler.impl.TransitionFunctionPainter;
  15
  16 /**
  17  * Transition function
  18  * - Bijective function
  19  *
  20  * @See {@link TransitionFunctionPainter}
  21  * @author Toni Kalajainen
  22  */
  23 public interface TransitionFunction {
  24
  25         public static final TransitionFunction LINEAR =
  26                 new TransitionFunction() {
  27                         @Override
  28                         public double f(double p) {
  29                                 return p;
  30                         }};
  31         public static final TransitionFunction SIGMOID =
  32                 new TransitionFunction() {
  33                         @Override
  34                         public double f(double p) {
  35                                 return 1 / (1+ Math.exp(6-p*12));
  36                         }};
  37
  38         /**
  39          * Calculates transition value
  40          * @param p 0..1
  41          * @return 0..1
  42          */
  43         double f(double p);
  44
  45 }