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Cutting image files to separate QPixmaps

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hamishwillee (Talk | contribs)
m (Text replace - "Category:MeeGo" to "Category:MeeGo Harmattan")
hamishwillee (Talk | contribs)
m (Text replace - "<code cpp>" to "<code cpp-qt>")
 
Line 26: Line 26:
 
== 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
Compatibility
Platform(s):
Symbian
Article
Keywords: QPixmap
Created: teemup (12 Dec 2011)
Last edited: hamishwillee (11 Oct 2012)

[edit] 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();
This page was last modified on 11 October 2012, at 04:16.
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