pointillism.h File Reference

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Functions
QImage *	pointillismEffect (QString filename, ManipulationOptions *options)

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Function Documentation

QImage* pointillismEffect (  QString  filename, ManipulationOptions *  options )

Definition at line 109 of file pointillism.cpp. References blackWhiteEffect(), computeLocalGrayVal(), drawDotAt(), editedImage, and pickRandomPixelWithinBlock(). Referenced by EditingInterface::applyEffect(). { //intialize seed using current time srand( unsigned(time(NULL)) ); //load original image and convert to grayscale QImage* originalImage = blackWhiteEffect( filename, NULL ); //construct edited image QImage* editedImage = new QImage( originalImage->width(), originalImage->height(), originalImage->depth() ); //fill with white since we'll be drawing black/color dots on top editedImage->fill( qRgb(255,255,255) ); //break image into BLOCK_SIZE x BLOCK_SIZE blocks. iterate over //each block and pick a random pixel within. Local //average gray value in edited image is > originalImage + thresh //then draw a dot at pixel. continue doing this for each block //and repeat until ??? const int BLOCK_SIZE = 8; //compute image size in blocks int blocksWide = editedImage->width() / BLOCK_SIZE; if(blocksWide*BLOCK_SIZE < editedImage->width()) { blocksWide++; } int blocksTall = editedImage->height() / BLOCK_SIZE; if(blocksTall*BLOCK_SIZE < editedImage->height()) { blocksTall++; } //iterate over image say 100 times, we'll need to fix this outer loop to be smarter? int bx,by,x,y; for(int i=0; i<10; i++) { //iterate over all blocks for(bx=0; bx<blocksWide; bx++) { for(by=0; by<blocksTall; by++) { //pick random pixel within block pickRandomPixelWithinBlock( editedImage->width(), editedImage->height(), bx, by, BLOCK_SIZE, x, y ); double curGrayVal = computeLocalGrayVal( editedImage, x, y ); double goalGrayVal = computeLocalGrayVal( originalImage, x, y ); //too bright -> draw dot if( curGrayVal > goalGrayVal ) { drawDotAt( editedImage, x, y, 5 ); } } } } //free grayscale form of original image delete originalImage; originalImage = NULL; //return pointer to edited image return editedImage; }

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