// DrawImageFromFile.java (based on BasicGraphics.java)

// Place an image named "sampleImage.jpg" in the same directory as
// this file, then compile and run this code to display the image.

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import java.awt.geom.*;

public class DrawImageFromFile extends JComponent {

  // Convert a jpg or png file into an awt Image (this is a quick way;
  // we really should use an ImageObserver or some other more reliable way).
  public static Image getImageFromFile(String filename) {
  	return new ImageIcon(filename).getImage();
  }
  
  // Load the image only once -- so make it static
  private static Image sampleImage = getImageFromFile("sampleImage.jpg");

  // Sample paint method:
  public void paint(Graphics page) {
    // get the dimensions of the draw area
    int width  = this.getWidth();
    int height = this.getHeight();
   
    // paint the background a pleasing olive green to complement our image
    page.setColor(new Color(120,120,50));
    page.fillRect(0,0,width,height);

    // center the full-sized, non-rotated image in the window
    paintCenteredImage(page, sampleImage, width/2, height/2, 1.0, 0.0);
    
    // now draw a version of the image with its left-top at (0,0) and scaled to be smaller
    paintImage(page, sampleImage, 0, 0, (1.0/5.0), 0.0);
    
    // and draw a 1/5th version in the top-right corner rotated by 45 degrees
    // This requires that we obtain the size of the rotated image so we
    // can compute its resulting left-top
    Dimension newSize = getImageSize(sampleImage, (1.0/5.0), Math.toRadians(45));
    double newLeft = width  - newSize.getWidth();
    double newTop  = 0;
    paintImage(page, sampleImage, newLeft, newTop, (1.0/5.0), Math.toRadians(45));
  }
  
  // Paint the given image rotated and scaled with a top-left at x,y
  public void paintImage(Graphics page, Image image, double x, double y, double scale, double radians) {
    double imageWidth  = image.getWidth(null);
    double imageHeight = image.getHeight(null);
    Dimension newSize = getImageSize(image, scale, radians);
    AffineTransform transform = new AffineTransform();
    transform.translate(x+newSize.getWidth()/2,y+newSize.getHeight()/2); // last (not first!)
    transform.rotate(radians);
    transform.scale(scale,scale);
    transform.translate(-imageWidth/2, -imageHeight/2);  // first
    ((Graphics2D)page).drawImage(image,transform,null);
  }

  // Same as paintImage, only here we position the image by its center
  public void paintCenteredImage(Graphics page, Image image, double cx, double cy, double scale, double radians) {    
    Dimension newSize = getImageSize(image, scale, radians);
    paintImage(page, image, cx - newSize.getWidth()/2, cy - newSize.getHeight()/2, scale, radians);
  }
    
  // get the size of this image after it has been scaled and rotated
  public Dimension getImageSize(Image image, double scale, double radians) {
    double imageWidth  = image.getWidth(null);
    double imageHeight = image.getHeight(null);
    AffineTransform transform = new AffineTransform();
    transform.rotate(radians);
    transform.scale(scale,scale);
    transform.translate(-imageWidth/2, -imageHeight/2);  // first
    double[] x = { 0, imageWidth, imageWidth ,     0       };
    double[] y = { 0,     0     , imageHeight, imageHeight };
    double minx=0, maxx=0, miny=0, maxy=0;
    Point2D.Double src = new Point2D.Double(), dst = new Point2D.Double();
    for (int i=0; i<4; i++) {
      src.setLocation(x[i],y[i]);
      transform.transform(src,dst);
      if (i == 0) {
        minx = maxx = dst.getX();
        miny = maxy = dst.getY();
      }
      else {
        minx = Math.min(dst.getX(),minx);
        miny = Math.min(dst.getY(),miny);
        maxx = Math.max(dst.getX(),maxx);
        maxy = Math.max(dst.getY(),maxy);
      }
    }
    return new Dimension((int)(maxx-minx), (int)(maxy-miny));
  } 
   
  public static void main(String[] args) {
      JComponent myGraphics = new DrawImageFromFile();
      launch(myGraphics, 600, 500); // Set the initial dimensions here!
   }
   
   //////////////////////////////////////////////////////////////////////////////
   /////////////////           END OF YOUR CODE             /////////////////////
   /////////////////  (you may ignore all the code below!!! /////////////////////
   //////////////////////////////////////////////////////////////////////////////

   public static void launch(JComponent jc, int width, int height) {
      JFrame frame = new JFrame(jc.getClass().getName());
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      JPanel cp = new JPanel();
      cp.setLayout(new BorderLayout());
      cp.add(jc);
      frame.setContentPane(cp);
      frame.setSize(new Dimension(width,height));
      frame.setVisible(true);
   }
}