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Tuesday, October 26th 2004, 11:43am
Quoted
Originally posted by n_ezdiani
i would like to ask you about the the visiblity of a magnified pixmap...what i mean is, let say the viewport size is smaller than the magnified pixmap, why cant i scroll the rest of the part that havent shown?...
btw i've looked at your jseries tool but I want to try to do it myself ...so could you help me please..
Tuesday, October 26th 2004, 5:05pm
Originally posted by Krasu
I think the best way is to use QImage::scale || QImage::smoothScale, anyway, QPixmap can be translated to QImage (see doc.) and back to QPixmap.
Wednesday, October 27th 2004, 5:55am
Originally posted by wysota
Originally posted by Krasu
I think the best way is to use QImage::scale || QImage::smoothScale, anyway, QPixmap can be translated to QImage (see doc.) and back to QPixmap.
It's not worth it... the conversions are slow. Better than that is to use QCanvas, QCanvasView, QCanvasSprite and QWMatrix
Wednesday, October 27th 2004, 6:36am
It is very to hard to tell what is wrong without any code. Look at the QjPixmapView. There, the viewport is resized when the zoom factor changes. That is how you do it.
Map::Map( QWidget* parent, const char* name, WFlags fl )
: QWidget( parent, name, fl )
{
.....
ms = new MapScroll(this, "ms");
.....
......
}
MapScroll::MapScroll(QWidget* parent, const char* name)
: QScrollView(parent,"zoom"),bg("images/map.png")
{
bg.load("images/map.png");
setGeometry (20,10,200,260);
setMouseTracking (TRUE);
setDragAutoScroll (TRUE);
setVScrollBarMode( QScrollView::Auto );
setHScrollBarMode( QScrollView::Auto );
};
void MapScroll:: contentsMouseReleaseEvent( QMouseEvent * e)
{
contentsToViewport(e->x(), e->y(),x,y);
qDebug("value x = %d", x);
qDebug("value y = %d", y);
viewport()->update();
}
void MapScroll::drawContents(QPainter *p, int clipx, int clipy, int clipw, int cliph)
{
qWarning("inside drawContents");
/* this part is not occurate yet!!*/
if (x<=viewport()->width()/2)
w = 0;
else
w = x - viewport()->width()/2;
if (y<=viewport()->height()/2)
h = 0;
else
h = y - viewport()->height()/2;
/*=========================*/
p->scale(cbono+1,cbono+1);
resizeContents(bg.width()*cbono+1,bg.height()*cbono+1);
p->drawPixmap(0,0,bg,w,h,-1,-1);
}
Wednesday, October 27th 2004, 10:36am
|
Source code |
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void QjPixmapView::drawContents( QPainter *p, int clipx, int clipy, int clipw, int cliph )
{
p->setBrush( Qt::darkGray );
p->setPen( Qt::darkGray );
p->drawRect( clipx, clipy, clipw, cliph );
if( !pd->pm.isNull() )
{
p->setClipping( false );
int left, top;
if( viewport()->width() <= pd->pm.width()*pd->zoom )
left = 0;
else
left = (int)(viewport()->width()-pd->pm.width()*pd->zoom)/2;
if( viewport()->height() <= pd->pm.height()*pd->zoom )
top = 0;
else
top = (int)(viewport()->height()-pd->pm.height()*pd->zoom)/2;
if( pd->zoom != 1.0 )
{
p->translate( -left*(pd->zoom-1.0), -top*(pd->zoom-1.0) );
p->scale( pd->zoom, pd->zoom );
}
p->drawPixmap( left, top, pd->pm );
if( pd->zoom != 1.0 )
p->resetXForm();
p->setPen( Qt::black );
p->setBrush( Qt::NoBrush );
p->drawRect( left-1, top-1, (int)(pd->pm.width()*pd->zoom+2), (int)(pd->pm.height()*pd->zoom+2) );
}
}
|
Friday, October 29th 2004, 4:33am
p->scale(cbono+1,cbono+1);
resizeContents(bg.width()*cbono+1,bg.height()*cbono+1);
p->drawPixmap(0,0,bg,w,h,-1,-1);
center (x,y); // OR ensureVisible(int,int)
This post has been edited 1 times, last edit by "n_ezdiani" (Oct 29th 2004, 4:41am)
Friday, October 29th 2004, 7:00am
Originally posted by n_ezdiani
but now, i have a question to ask you regarding the scrollbar...it's like this.... i have a horizontal & vertical scrollbars and besides using the scrollbars, i want to pan the pixmap by clicking on the pixmap... so i tried using center(int,int) or ensureVisible(int,int) so that the clicked point can be centered(visible)... at first, when i click, it can pan the pixmap to the left, right, top or bottom but somehow after a few clicks, the scrollbars keep on increasing to the right and to the bottom respectively eventhough i click to the left or top... seems like after panning to the middle area of the pixmap the pixmap can only be panned to the right and bottom only...it doesnt want to scroll back to the left nor the top...
[/qoute]
This sounds really odd, but it is very hard to tell what has gone wrong from your description.
Originally posted by n_ezdiani
btw, is there any other way to make the clicked point visible other than center(int,int) and ensureVisible(int,int)...
[/qoute]
You could always calculate new slider values and setting them manually...
Monday, November 1st 2004, 9:25am
Originally posted by n_ezdiani
i'm using QScrollView too.. do you provide panning in your jseries? if you do, what members did you use for panning the pixmap and make it centered?
