tim/prune/save/ImagePreviewPanel.java

   1 package tim.prune.save;
   2
   3 import java.awt.Color;
   4 import java.awt.Dimension;
   5 import java.awt.Graphics;
   6
   7 import javax.swing.JPanel;
   8
   9 import tim.prune.I18nManager;
  10
  11 /**
  12  * GUI component to display an image preview for the POV export
  13  * and for the image export
  14  */
  15 public class ImagePreviewPanel extends JPanel
  16 {
  17         /** Base image */
  18         private GroutedImage _baseImage = null;
  19         /** Loading flag */
  20         private boolean _loading = false;
  21
  22         /** String to show before image is loaded */
  23         private static final String LOADING_STRING = I18nManager.getText("details.photo.loading") + " ...";
  24         /** Colour to use if there aren't any tiles at all (same as colour of POV export without image) */
  25         private static final Color EMPTY_IMAGE_COLOUR = new Color(0.5f, 0.75f, 0.8f);
  26
  27
  28         /** Set the base image */
  29         public void setImage(GroutedImage inImage)
  30         {
  31                 _baseImage = inImage;
  32                 _loading = false;
  33                 repaint();
  34         }
  35
  36         /** Inform that a load is starting */
  37         public void startLoading()
  38         {
  39                 _baseImage = null;
  40                 _loading = true;
  41                 repaint();
  42         }
  43
  44         /** Get minimum size */
  45         public Dimension getMinimumSize() {
  46                 return new Dimension(200, 200);
  47         }
  48         /** Preferred size */
  49         public Dimension getPreferredSize() {
  50                 return getMinimumSize();
  51         }
  52
  53         /**
  54          * Override paint method
  55          * @see javax.swing.JComponent#paint(java.awt.Graphics)
  56          */
  57         public void paint(Graphics inG)
  58         {
  59                 super.paint(inG);
  60                 if (_loading)
  61                 {
  62                         inG.setColor(Color.BLACK);
  63                         inG.drawString(LOADING_STRING, 10, 30);
  64                 }
  65                 else if (_baseImage != null)
  66                 {
  67                         final int width = getWidth();
  68                         final int height = getHeight();
  69                         final int previewSize = Math.min(width, height);
  70                         if (previewSize > 1)
  71                         {
  72                                 if (_baseImage.isValid())
  73                                 {
  74                                         inG.drawImage(_baseImage.getImage(),
  75                                                 (width-previewSize)/2, (height-previewSize)/2, previewSize, previewSize, this);
  76                                 }
  77                                 else
  78                                 {
  79                                         // No content found at all
  80                                         inG.setColor(EMPTY_IMAGE_COLOUR);
  81                                         inG.fillRect((width-previewSize)/2, (height-previewSize)/2, previewSize, previewSize);
  82                                 }
  83                                 // draw frame around it to make it more obvious
  84                                 inG.setColor(Color.BLACK);
  85                                 inG.drawRect((width-previewSize)/2, (height-previewSize)/2, previewSize-1, previewSize-1);
  86                         }
  87                 }
  88         }
  89
  90         /**
  91          * @return true if there is an image to use and it contains map tiles
  92          */
  93         public boolean getTilesFound()
  94         {
  95                 return _baseImage != null && _baseImage.isValid() && _baseImage.getImageSize() > 1
  96                         && _baseImage.getNumTilesUsed() > 0;
  97         }
  98 }