net.alantea.swing.ui.ImageTool Maven / Gradle / Ivy

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package net.alantea.swing.ui;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.RenderingHints;

import javax.swing.ImageIcon;

public class ImageTool
{
  public static void drawImageInto(Graphics g, ImageIcon icon, Rectangle view)
  {
     if (icon != null)
     {
        int posx = view.x;
        int posy = view.y;
        
        double ratioImg = (double) icon.getIconHeight() / (double) icon.getIconWidth();
        
        int originalWidth = icon.getIconWidth();
        int originalHeight = icon.getIconHeight();
        
        double xRatio = (double) view.width / (double) originalWidth;
        double yRatio = (double) view.height / (double) originalHeight;

        double ratio = 1.0;
        if (xRatio < yRatio)
        {
           ratio = xRatio;
        }
        else
        {
           ratio = yRatio;
        }

        // Calculate the img size for the currentText resolution
        double resizedImgWidth = ratio * (float) icon.getIconWidth();
        double resizedImgHeight = ratioImg * resizedImgWidth;
        
        if (posx == Integer.MIN_VALUE)
        {
           posx = (view.width - (int) resizedImgWidth) / 2;
        }
        
        if (posy == Integer.MIN_VALUE)
        {
           posy = (view.height - (int) resizedImgHeight) / 2;
        }

        // Redimension of the image
        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        g2.drawImage(icon.getImage(), posx, posy, (int) resizedImgWidth, (int) resizedImgHeight, null);
     }
  }

   public static void getBestRectangleFor(Rectangle maxView, ImageIcon icon, Rectangle output)
   {
      int iWidth = icon.getIconWidth();
      int iHeight = icon.getIconHeight();
      
      double hRatio = maxView.getWidth() / ((double) iWidth);
      double vRatio = maxView.getHeight() / ((double) iHeight);
      double ratio = Math.min(hRatio, vRatio);
      
      output.width = (int) (iWidth * ratio);
      output.height = (int) (iHeight * ratio);
   }
}