1. Using the ImageViewer classes

2. ImageViewer classes CAboutDlg CAboutDlg CChildFrame CChildFrame CDlgTemplateBuilder CDlgTemplateBuilder CInputDialog CInputDialog CImageViewerApp CImageViewerApp CImageViewerDoc CImageViewerDoc CImageViewerView CImageViewerView CLUT CLUT CMainFrame CMainFrame pnmHelper pnmHelper TIFFWriter TIFFWriter Timer Timer

3. ImageViewer classes Most important classes: Most important classes: –CImageViewerDoc –CImageViewerView –CInputDialog –pnmHelper –TIFFWriter –Timer

4. ImageViewer classes CImageViewerDoc class CImageViewerDoc class –mImageWidth, mImageHeight –mImageMin, mImageMax –OnOpenDocument(), OnSaveDocument(), OnCloseDocument()

5. ImageViewer classes CImageViewerDoc class CImageViewerDoc class –mImageSamplesPerPixel  1=gray, 3=rgb –int* mImage  actual image pixel data  stored mImage[0] is gray  or mImage[0]=r, mImage[1]=g, mImage[2]=b –3 separate ints

6. ImageViewer classes CImageViewerView class CImageViewerView class –unsigned char* mImage  displayable image  stored: b, g, r, 0 –4 separate bytes –Intel is little endian so this is actually 0,r,g,b  Recall CImageViewerDoc::mImage is 1 int per component while CImageViewerView::mImage is 1 byte per component. –OnMouseMove()

7. ImageViewer classes CImageViewerView class CImageViewerView class –OnDraw() CBitmap bm; bm.CreateBitmap( pDoc->mImageWidth, pDoc->mImageHeight, 1, 32, mImage ); pDoc->mImageHeight, 1, 32, mImage ); pDC->BitBlt( 0, 0, pDoc->mImageWidth, pDoc->mImageHeight, &dcMem, 0, 0, SRCCOPY ); pDoc->mImageHeight, &dcMem, 0, 0, SRCCOPY );or pDC->StretchBlt( mTx, mTy, (int)(mScale*pDoc->mImageWidth+0.5), (int)(mScale*pDoc->mImageWidth+0.5), (int)(mScale*pDoc->mImageHeight+0.5), &dcMem, 0, 0, (int)(mScale*pDoc->mImageHeight+0.5), &dcMem, 0, 0, pDoc->mImageWidth, pDoc->mImageWidth, pDoc->mImageHeight, SRCCOPY ); pDoc->mImageHeight, SRCCOPY );

8. ImageViewer classes pnmHelper class pnmHelper class static int* read_pnm_file ( const char* const fname, int* w, int* h, const char* const fname, int* w, int* h, int* samplesPerPixel, int* min, int* max) int* samplesPerPixel, int* min, int* max) This method should be generally used to read any pnm (pgm grey, ppm color) binary or ascii image files.

9. ImageViewer classes pnmHelper class pnmHelper class static void write_pgm_or_ppm_ascii_data ( const int* const buff, const int width, const int* const buff, const int width, const int height, const char* const fname, const int height, const char* const fname, const int samples_per_pixel ) const int samples_per_pixel ) Write values as a pgm (grey) or ppm (color) ascii file.

10. ImageViewer classes TIFFWriter class TIFFWriter class static void write_tiff_data8_rgb ( uint8* buff, int width, int height, FILE* fp, int width, int height, FILE* fp, const bool use_clut, const bool use_clut, const int samples_per_pixel ) const int samples_per_pixel ) Write a 24-bit color tiff image.

11. ImageViewer classes Timer class Timer class –Updated 3/22 –Can be used to easily time algorithms. –Timer() ctor starts the timer. –reset() resets the timer to 0 (and start the timer) –getElapsedTime() returns a double of the elapsed time in seconds. –getCPUTime() returns a double of the CPU time used in seconds. –Timer demo: show Debug and Release for median filter.

12. Timer class for Java public class Timer { /** \brief start at current time when constructed */ /** \brief start at current time when constructed */ private long mTime = System.currentTimeMillis(); private long mTime = System.currentTimeMillis(); /** \brief reset to current time */ /** \brief reset to current time */ public void reset ( ) { public void reset ( ) { mTime = System.currentTimeMillis(); mTime = System.currentTimeMillis(); } /** \brief return elapsed time in seconds */ /** \brief return elapsed time in seconds */ public double getElapsedTime ( ) { public double getElapsedTime ( ) { return (System.currentTimeMillis() - mTime) / 1e3; return (System.currentTimeMillis() - mTime) / 1e3; }}

13. ImageViewer classes CInputDialog class CInputDialog class –get new CInputDialog.h file from course web page –AfxMessageBox presents a modal dialog box to the user with a programmer-specified string. Java: String value = JOptionPane.showInputDialog( String value = JOptionPane.showInputDialog( "Enter value: " ); "Enter value: " );C++: CInputDialog dlg("Enter a value: "); CInputDialog dlg("Enter a value: "); CString result = dlg.m_str; //what user typed

14. Misc. C review topics printf printf –Must first #include –Must first #include int i=5242; printf( “The value %d\nis %x in hex.\n”, i, i ); double d = 65.769970; printf( “The std dev = %f.”, d ); char* name = “Ochlak”; printf( “Mr. %s, you have %.2f in your account.”, str, d );

15. Misc. C review topics sprintf sprintf –Just like printf but works on a string buffer in memory. char buff[ 256 ]; sprintf( buff, “Mr. %s, you have %.2f in your account.”, “Mr. %s, you have %.2f in your account.”, str, d ); AfxMessageBox( buff );

16. Misc. C review topics malloc/free malloc/free int* iptr = (int*) malloc( 1000 * sizeof(int) ); //what if iptr == NULL? for (int i=0; i<1000; i++) iptr[i] = i; iptr[i] = i; free( iptr ); //must do this or memory leaks occur! iptr = NULL; //just to be extra careful

17. Misc. C review topics Assert Assert –Assume or require some condition to be true. –Now in Java 5 as well! int* iptr = (int*) malloc( 1000 * sizeof(int) ); //what if iptr == NULL? assert( iptr != NULL ); Disappears completely in non-debug mode.

18. Misc. C review topics CInputDialog dlg("Enter a value: "); How can we check and convert what the user typed (a number)? int x; int howManyWereOK = sscanf( dlg.m_str, "%d", &x ); if (howManyWereOK!=1) { AfxMessageBox( “Bad input.” ); } else {......}

19. Misc. Java review topics String value = JOptionPane.showInputDialog( "Enter value: " ); "Enter value: " ); How can we check and convert what the user typed (a number)? boolean inputOK=true; int x; try { x = Integer.parseInt( value ); x = Integer.parseInt( value ); } catch (Exception e) { inputOK=false; inputOK=false;} if (!inputOK) {...... } else {......}

20. Misc. Java review topics String value = JOptionPane.showInputDialog( "Enter value: " ); "Enter value: " ); Octal support. int xy = 09; Compiler error: integer number too large. int jj = 0123; System.out.println( jj ); 83