Implementing Zoom in the BitmapView Class

The BitmapView::zoomIn and BitmapView::zoomOut methods are inlined and the BitmapView::zoom method is called:

void zoomIn() { zoom((IlFloat)2.); }

void zoomOut() { zoom((IlFloat).5); }

The only method that needs to be implemented is the BitmapView::zoom method:

void

BitmapView::zoom(IlFloat factor)

{

IlvContainer* container = IlvContainer::GetContainer(_icon);

container->zoomView(IlvPoint(0,0), factor, factor);

// Resize the container to fit the bitmap

IlvRect bbox;

container->boundingBox(bbox);

container->resize(bbox.w()*factor, bbox.h()*factor);

}

It uses the IlvContainer::zoomView method to change the transformer used to draw the IlvZoomableIcon that displays the document bitmap.

Then, the container of the icon is resized so that the scroll bars of the scrolled view are updated.

The final Bitmap Editor application is shown in figure 1.6:

Figure 1.6 The Final Bitmap Editor Application

Version 5.8