git.gag.com Git - debian/openrocket/blob - core/src/net/sf/openrocket/gui/components/ImageDisplayComponent.java

   1 package net.sf.openrocket.gui.components;
   2
   3 import java.awt.Color;
   4 import java.awt.Graphics;
   5 import java.awt.Graphics2D;
   6 import java.awt.RenderingHints;
   7 import java.awt.image.BufferedImage;
   8 import java.io.File;
   9
  10 import javax.imageio.ImageIO;
  11 import javax.swing.JFrame;
  12 import javax.swing.JPanel;
  13 import javax.swing.SwingUtilities;
  14
  15 import net.miginfocom.swing.MigLayout;
  16 import net.sf.openrocket.util.MathUtil;
  17
  18 /**
  19  * Draws a BufferedImage centered and scaled to fit to the component.
  20  *
  21  * @author Sampo Niskanen <sampo.niskanen@iki.fi>
  22  */
  23 public class ImageDisplayComponent extends JPanel {
  24
  25         private BufferedImage image;
  26
  27         public ImageDisplayComponent() {
  28                 this(null);
  29         }
  30
  31         public ImageDisplayComponent(BufferedImage image) {
  32                 this.image = image;
  33         }
  34
  35
  36         @Override
  37         protected void paintComponent(Graphics g) {
  38                 super.paintComponent(g);
  39
  40                 if (image == null) {
  41                         return;
  42                 }
  43
  44                 final int width = Math.max(this.getWidth(), 1);
  45                 final int height = Math.max(this.getHeight(), 1);
  46
  47                 final int origWidth = Math.max(image.getWidth(), 1);
  48                 final int origHeight = Math.max(image.getHeight(), 1);
  49
  50
  51                 // Determine scaling factor
  52                 double scaleX = ((double) width) / origWidth;
  53                 double scaleY = ((double) height) / origHeight;
  54
  55                 double scale = MathUtil.min(scaleX, scaleY);
  56
  57                 if (scale >= 1) {
  58                         scale = 1.0;
  59                 }
  60
  61
  62                 // Center in the middle of the component
  63                 int finalWidth = (int) Math.round(origWidth * scale);
  64                 int finalHeight = (int) Math.round(origHeight * scale);
  65
  66                 int posX = (width - finalWidth) / 2;
  67                 int posY = (height - finalHeight) / 2;
  68
  69
  70                 // Draw the image
  71                 int dx1 = posX;
  72                 int dy1 = posY;
  73                 int dx2 = posX + finalWidth;
  74                 int dy2 = posY + finalHeight;
  75                 int sx1 = 0;
  76                 int sy1 = 0;
  77                 int sx2 = origWidth;
  78                 int sy2 = origHeight;
  79
  80                 Graphics2D g2 = (Graphics2D) g;
  81                 g2.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_NORMALIZE);
  82                 g2.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
  83                 g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
  84                 g2.drawImage(image, dx1, dy1, dx2, dy2, sx1, sy1, sx2, sy2, null);
  85
  86         }
  87
  88
  89         public BufferedImage getImage() {
  90                 return image;
  91         }
  92
  93
  94         public void setImage(BufferedImage image) {
  95                 this.image = image;
  96                 this.repaint();
  97         }
  98
  99
 100         public static void main(String[] args) throws Exception {
 101                 final BufferedImage image = ImageIO.read(new File("test.png"));
 102
 103                 SwingUtilities.invokeAndWait(new Runnable() {
 104                         @Override
 105                         public void run() {
 106
 107                                 JFrame frame = new JFrame();
 108
 109                                 JPanel panel = new JPanel(new MigLayout("fill"));
 110                                 panel.setBackground(Color.red);
 111                                 frame.add(panel);
 112
 113                                 ImageDisplayComponent c = new ImageDisplayComponent(image);
 114                                 panel.add(c, "grow");
 115
 116                                 frame.setSize(500, 500);
 117                                 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 118                                 frame.setVisible(true);
 119
 120                         }
 121                 });
 122         }
 123
 124 }