git.gag.com Git - debian/openrocket/blob - src/net/sf/openrocket/gui/scalefigure/AbstractScaleFigure.java

   1 package net.sf.openrocket.gui.scalefigure;
   2
   3 import java.awt.Color;
   4 import java.awt.Dimension;
   5 import java.util.LinkedList;
   6 import java.util.List;
   7
   8 import javax.swing.JPanel;
   9 import javax.swing.event.ChangeEvent;
  10 import javax.swing.event.ChangeListener;
  11
  12 import net.sf.openrocket.util.Prefs;
  13
  14
  15 public abstract class AbstractScaleFigure extends JPanel implements ScaleFigure {
  16
  17         // Number of pixels to leave at edges when fitting figure
  18         public static final int BORDER_PIXELS_WIDTH=30;
  19         public static final int BORDER_PIXELS_HEIGHT=20;
  20
  21
  22         protected final double dpi;
  23
  24         protected double scale = 1.0;
  25         protected double scaling = 1.0;
  26
  27         protected final List<ChangeListener> listeners = new LinkedList<ChangeListener>();
  28
  29
  30         public AbstractScaleFigure() {
  31                 this.dpi = Prefs.getDPI();
  32                 this.scaling = 1.0;
  33                 this.scale = dpi/0.0254*scaling;
  34
  35                 setBackground(Color.WHITE);
  36                 setOpaque(true);
  37         }
  38
  39
  40
  41         public abstract void updateFigure();
  42         public abstract double getFigureWidth();
  43         public abstract double getFigureHeight();
  44
  45
  46         @Override
  47         public double getScaling() {
  48                 return scaling;
  49         }
  50
  51         @Override
  52         public double getAbsoluteScale() {
  53                 return scale;
  54         }
  55
  56         @Override
  57         public void setScaling(double scaling) {
  58                 if (Double.isInfinite(scaling) || Double.isNaN(scaling))
  59                         scaling = 1.0;
  60                 if (scaling < 0.001)
  61                         scaling = 0.001;
  62                 if (scaling > 1000)
  63                         scaling = 1000;
  64                 if (Math.abs(this.scaling - scaling) < 0.01)
  65                         return;
  66                 this.scaling = scaling;
  67                 this.scale = dpi/0.0254*scaling;
  68                 updateFigure();
  69         }
  70
  71         @Override
  72         public void setScaling(Dimension bounds) {
  73                 double zh = 1, zv = 1;
  74                 int w = bounds.width - 2*BORDER_PIXELS_WIDTH -20;
  75                 int h = bounds.height - 2*BORDER_PIXELS_HEIGHT -20;
  76
  77                 if (w < 10)
  78                         w = 10;
  79                 if (h < 10)
  80                         h = 10;
  81
  82                 zh = ((double)w) / getFigureWidth();
  83                 zv = ((double)h) / getFigureHeight();
  84
  85                 double s = Math.min(zh, zv)/dpi*0.0254 - 0.001;
  86
  87                 setScaling(s);
  88         }
  89
  90
  91
  92         @Override
  93         public void addChangeListener(ChangeListener listener) {
  94                 listeners.add(0,listener);
  95         }
  96
  97         @Override
  98         public void removeChangeListener(ChangeListener listener) {
  99                 listeners.remove(listener);
 100         }
 101
 102         private ChangeEvent changeEvent = null;
 103         protected void fireChangeEvent() {
 104                 ChangeListener[] list = listeners.toArray(new ChangeListener[0]);
 105                 for (ChangeListener l: list) {
 106                         if (changeEvent == null)
 107                                 changeEvent = new ChangeEvent(this);
 108                         l.stateChanged(changeEvent);
 109                 }
 110         }
 111
 112 }