Cutting image files to separate QPixmaps
hamishwillee
(Talk | contribs) m (Text replace - "Category:MeeGo" to "Category:MeeGo Harmattan") |
hamishwillee
(Talk | contribs) m (Text replace - "<code cpp>" to "<code cpp-qt>") |
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== Source code == | == Source code == | ||
| − | <code cpp> | + | <code cpp-qt> |
QList<QPixmap*> frames; //will include the output frames | QList<QPixmap*> frames; //will include the output frames | ||
Latest revision as of 04:16, 11 October 2012
This code snippet shows how you can load an image file (for example, PNG) and separate it into several smaller QPixmap tiles for display. This is useful, for example, if you wanted to implement a slide puzzle game.
Article Metadata
Source code
QList<QPixmap*> frames; //will include the output frames
QString file = "c:/image.png";
int cols = 5;
int rows = 5;
QPixmap *image = new QPixmap(file);
if (cols == 1 && rows == 1) {
frames.append(image);
w = image->width();
h = image->height();
}
else {
int iw = image->width();
int ih = image->height();
w = iw/cols;
h = ih/rows;
int x = 0;
int y = 0;
for (int r=0; r < rows; r++) {
for (int c=0; c < cols; c++) {
QPixmap *cropped = new QPixmap(image->copy(x,y,w,h));
frames.append(cropped);
x += w;
}
y += h;
x = 0;
}
delete image;
}
//Do something with the pixmaps
//Delete in the end
if (frames.count() > 0) {
foreach (QPixmap* pixmap, frames) {
delete pixmap;
}
}
frames.clear();
