Package totalcross.unit

Class ImageTester

  • public class ImageTester
extends Image
    This class is a helper to test if two images are equal, ie, their width and height are the satest and their pixel values are the satest. There's first a learning stage where the images are generated and the compressed strings are created. Then the test should run again to do the effective comparision at a pda.

    Here's a sample: 

     public class GraphicsTest extends TestCase
 {
    private Graphics g;
    private boolean learning = false; // change this to true to generate the strings

    // generated string during learning stage
    private String drawLine = "58C3AD94510EC2300CC5DEFD0FEA73C0186C0335892791DF7956DB240F6485CCB571027CCAC80C6E2E32822F1599C0DD4406F02D223DF8F190163C34A4034F0B69C08B84D4E0D5414AF04BD17C4ACDA5BA16D5997EFFA778FF4C5C9613B4E0B21A5DDA2EFCC527CFD7DE17F77EDCED87ECAF9C17397FF33C73633FE4BEC9FD957920F345E695CC3F99A7329F0DB683AA1EE9F8D157";

    private ImageTester testDrawLine()
    {
       int w = 40, h = 40;
       ImageTester it = new ImageTester(w,h);
       Graphics g = it.g;
       g.backColor = Color.WHITE;
       g.fillRect(0,0,w,h);
       g.drawLine(0,0,w,h);
       g.drawLine(0,0,w,0);
       g.drawLine(0,0,0,h);
       g.drawLine(w-1,0,w-1,h);
       g.drawLine(0,h-1,w,h-1);
       g.drawLine(w,0,0,h);
       g.drawLine(5,10,5,10); // a single pixel
       g.drawLine(5,15,6,16); // two pixels
       return it;
    }

    public void testRun()
    {
       g = MainWindow.getMainWindow().getGraphics();

       test(testDrawLine(), drawLine, "drawLine");
    }

    private void test(ImageTester it, String compressedResults, String title)
    {
       if (learning)
       {
          g.drawImage(it,0,0);
          Vm.debug("private String "+title+" = \""+it.toString()+"\";");
       }
       else
          assertEquals(it, compressedResults);
    }
 }

    • Field Detail

      • title

        public java.lang.String title

      • name

        public java.lang.String name

    • Method Detail

      • equals

        public boolean equals​(java.lang.Object originalObj)
        This testthod is the reason for the creation of this class. It compares two images byte per byte.
        Overrides:
        equals in class Image

      • hex2bytes

        public static void hex2bytes​(java.lang.String str,
                             ByteArrayStream bas)

      • toString

        public java.lang.String toString()
        Converts this image to String, as a string of hexadecimal numbers.
        Overrides:
        toString in class java.lang.Object