Tugas 4

Source codex :bool CxImage::Jitter(long radius){// check if the image is valid, this should be always the first line in// the functionif (!pDib) return false;// local variableslong nx,ny;// temporary image to store the partial results of the algorithmCxImage tmp(*this,pSelection!=0,true,true);// limit the effects of the functions only in the smallest rectangle that// holds the selected region (defined with the Selection...() functions ),// this will speed up the loops.long xmin,xmax,ymin,ymax;if (pSelection){xmin = info.rSelectionBox.left; xmax = info.rSelectionBox.right;ymin = info.rSelectionBox.bottom; ymax = info.rSelectionBox.top;} else {xmin = ymin = 0;xmax = head.biWidth; ymax=head.biHeight;}// main loop : scan the image in vertical directionfor(long y=ymin; y // monitor the progress of the loopsinfo.nProgress = (long)(100*y/head.biHeight);// let the application a way to exit quicklyif (info.nEscape) break;// main loop : scan the image in horizontal directionfor(long x=xmin; x// if the feature is enabled, process only the pixels inside the// selected region#if CXIMAGE_SUPPORT_SELECTIONif (SelectionIsInside(x,y))#endif //CXIMAGE_SUPPORT_SELECTION{// main algorithmnx=x+(long)((rand()/(float)RAND_MAX - 0.5)*(radius*2));ny=y+(long)((rand()/(float)RAND_MAX - 0.5)*(radius*2));if (!IsInside(nx,ny)) {nx=x;ny=y;}// save the result in the temporary image.// if you can, use PixelColor only for 24 bpp images,// and PixelIndex for 8, 4 and 1 bpp images : it's fasterif (head.biClrUsed==0){tmp.SetPixelColor(x,y,GetPixelColor(nx,ny));} else {tmp.SetPixelIndex(x,y,GetPixelIndex(nx,ny));}// if the feature is enabled, process also the pixels// in the alpha layer#if CXIMAGE_SUPPORT_ALPHAtmp.AlphaSet(x,y,AlphaGet(nx,ny));#endif //CXIMAGE_SUPPORT_ALPHA}}}// save the result and exitTransfer(tmp);return true;}