bundles/org.simantics.scenegraph/src/org/simantics/scenegraph/g2d/snap/GridSnapAdvisor.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.scenegraph.g2d.snap;
  13
  14 import java.awt.geom.Point2D;
  15 import java.io.Serializable;
  16
  17 import org.simantics.scl.runtime.function.Function1;
  18
  19 /**
  20  * @author Tuukka Lehtonen
  21  */
  22 public class GridSnapAdvisor implements ISnapAdvisor, Serializable {
  23
  24     private static final long serialVersionUID = 2411311098028229134L;
  25
  26     double resolution;
  27     Function1<Object, Boolean> enabled;
  28
  29     public GridSnapAdvisor(double resolution) {
  30         this.resolution = resolution;
  31     }
  32
  33     public void setEnabledFunction(Function1<Object, Boolean> function) {
  34         this.enabled = function;
  35     }
  36
  37     public void setResolution(double resolution) {
  38         this.resolution = resolution;
  39     }
  40
  41     public double getResolution() {
  42         return resolution;
  43     }
  44
  45     @Override
  46     public void snap(Point2D point) {
  47         if (enabled != null && !enabled.apply(null))
  48             return;
  49         point.setLocation(
  50             Math.round(point.getX() / resolution) * resolution,
  51             Math.round(point.getY() / resolution) * resolution);
  52     }
  53
  54     @Override
  55     public void snap(Point2D point, Point2D[] features) {
  56         if (enabled != null && !enabled.apply(null))
  57             return;
  58         double dx = features[0].getX();
  59         double dy = features[0].getY();
  60         point.setLocation(
  61             Math.round((point.getX()-dx) / resolution) * resolution + dx,
  62             Math.round((point.getY()-dy) / resolution) * resolution + dy);
  63     }
  64
  65     @Override
  66     public String toString() {
  67         return getClass().getSimpleName() + "[resolution=" + resolution + "]";
  68     }
  69
  70     @Override
  71     public int hashCode() {
  72         long temp = Double.doubleToLongBits(resolution);
  73         return (int) (temp ^ (temp >>> 32));
  74     }
  75
  76     @Override
  77     public boolean equals(Object obj) {
  78         if (this == obj)
  79             return true;
  80         if (obj == null)
  81             return false;
  82         if (getClass() != obj.getClass())
  83             return false;
  84         GridSnapAdvisor other = (GridSnapAdvisor) obj;
  85         return Double.doubleToLongBits(resolution) != Double.doubleToLongBits(other.resolution);
  86     }
  87
  88 }