import java.awt.Color;
import java.io.IOException;

import tester.Tester;

/**
 * An example of how one can use the two ImageReader classes and the MarsFileReader
 * to read images and build new images using the ImageBuilder class
 */
class ExamplesImages{

  ExamplesImages(){}

  // read an image file, 
  // test that reading and writing works correctly
  void testImages(Tester t){
    ImageReader ir = new ImageReader("Flowers.png");
    ImageBuilder2 iwred = new ImageBuilder2(ir.width, ir.height);
    Color c = ir.getColorPixel(20, 30);
    iwred.setColorPixel(20, 30, 
        c.getRed(), 0, 0);
    t.checkExpect(iwred.getColorPixel(20, 30),
        new Color(c.getRed(), 0, 0));
  }

  // read the mars file
  // test that reading and writing works correctly
  void testMarsImages(Tester t){
    MarsFileReader mr = new MarsFileReader();
    ImageBuilder2 mw = new ImageBuilder2(20, 30);
    int shade = 0; // the last shade that was set
    try{

      // read 10 pixels in a row for five rows
      for (int x = 0; x < 10; x = x + 1){
        for (int y = 0; y < 5; y = y + 1){
          
          // read the next shade
          shade = mr.bytestream.read();
          
          // set the pixel in our image 
          // to the same shade of gray
          mw.setColorPixel(x, y, 
              shade, shade, shade);
        }
      }

      // check that the last pixel has been set correctly
      t.checkExpect(mw.getColorPixel(9, 4),
          new Color(shade, shade, shade));

      // show the Canvas
      mw.canvas.show();
    }
    catch(IOException e){
      System.out.println("Error in reading Mars file");
    }
  }
}