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Thread: JSVGScrollPanel problems and updating while dragging
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| JSVGScrollPanel problems and updating
while dragging |
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2006-12-04 14:07:27 |
Hello
I still new to batik and svg and have a bit trouble with the
ScrollPane ... first it took me as newbie a long time
figuring out that a svgdocument created with SVGGraphics2D
does not seem to give the right bounding box neither set a
viewBox ... I understand that it does not set a vieBox but
what should be the problem with the BBox?
The next thing is that when I zoom in (via
setRenderingTransformation in JSVGCanvas) the sliders
doesn't seem set correctly only after I drag the vertical
slider all the way down it works ... am I missing something
that I need to set/check again?
And my last question, since the ScrollPane doesn't update
during dragging (to speed things up I guess? but I need that
for my application), I thought I just add that behaviour via
SBListeners which call some kind of update procedure but it
seems that there is no way to add SBListerns ... am I really
supposed to derive a new class for that?
Any tips how to create that behaviour?
thx & cu
ernii
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| JSVGScrollPanel problems and updating
while dragging |
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2006-12-04 23:37:15 |
Hi Ernst,
"Ernst Müller" <ernii_23gmx.net> wrote on
12/04/2006 09:07:27 AM:
> I still new to batik and svg and have a bit trouble
with the ScrollPane
...
> first it took me as newbie a long time figuring out
that a svgdocument
created
> with SVGGraphics2D does not seem to give the right
bounding box neither
set a
> viewBox ... I understand that it does not set a vieBox
but what should
be the
> problem with the BBox?
You can set the width/height on the SVGGraphics2D with:
SVGGraphics2D.setSVGCanvasSize(Dimension d);
> The next thing is that when I zoom in (via
setRenderingTransformation in
> JSVGCanvas) the sliders doesn't seem set correctly only
after I drag the
> vertical slider all the way down it works ... am I
missing something
that I
> need to set/check again?
There was a problem in this area in the 1.6 release I
think it's
fixed in SVN.
> And my last question, since the ScrollPane doesn't
update during
dragging (to
> speed things up I guess?
Yes, rendering complex SVG's can take a long time. Since
we
can't control this we use the last finished rendering until
the
user decides on the new view.
> but I need that for my application), I thought I just
> add that behavior via SBListeners which call some kind
of update
procedure
> but it seems that there is no way to add SBListerns ...
am I really
supposed
> to derive a new class for that?
Probably, I don't really have a problem with adding get
functions for
the SB instances, it just hasn't been needed to date.
> Any tips how to create that behavior?
This is very hard to do. Since the rendering is async
you need
a fair amount of tracking logic so that the paintTransform
and the
renderingTransform don't step on each other.
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| JSVGScrollPanel problems and updating
while dragging |
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2006-12-05 15:57:21 |
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While we are talking about changes to JSVGScrollPane, I made a
subclass to implement some changes that I found necessary. Also, I think
it would be great if there were methods like the JScrollPane's scroll bar
policies, however this doesn't look to feasible via a subclass.
I don’t
know the best way to do this, so I am just going to paste my working file into
this message. The main things I needed were to support:
- Zooming in, center the part of the canvas I want centered when the zoom is
completed
- Enabling "fit width" or "fit to page". To do this I needed
a way to get the size of the viewable area. ; (Kinda like the JViewport
size). This is complicated by the fact that the scrollbars cannot
currently be set to always visible
public class DJSVGScrollPane extends JSVGScrollPane
{
private Point zoomPoint;
public
DJSVGScrollPane(JSVGCanvas canvas)
{
super(canvas);
canvas.addGVTTreeRendererListener(
new RendererListener() );
addMouseWheelListener( new
MouseWheelListener() {
public void
mouseWheelMoved(MouseWheelEvent e)
{
vertical.setValue(vertical.getValue() + (10 *
e.getWheelRotation()));
}
});
}
public
JScrollBar getHorizontalScrollBar() {
return
horizontal;
}
public JScrollBar getVerticalScrollBar()
{
return vertical;
}
public Dimension
getMaximumViewableArea() {
//We have to use the bounds of the
enter pane and subtract the scrollbar sizes. We can't use the bounds of
the canvas since
//the scroll bars may not be visible, yet might
need to be when we are done.
Rectangle rect =
getBounds();
Dimension rval = new
Dimension(rect.width,rect.height);
rval.width -=
vertical.getWidth();
rval.height -=
horizontal.getHeight();
return rval;
}
private
Dimension getViewportSize() {
Dimension rval =
null;
Component[] comps = getComponents();
for
(int i = 0; i < comps.length; i++) {
if (comps[i]
instanceof JSVGCanvas) {
Rectangle rect =
comps[i].getBounds();
rval = new
Dimension(rect.width,rect.height);
break;
}
;}
return
rval;
}
public Rectangle
getCurrentSection() {
int x =
horizontal.getValue();
int y =
vertical.getValue();
Dimension d =
getViewportSize();
int width = d.width;
int height
= d.height;
;return new
Rectangle(x,y,width,height);
}
;public void setScale(double
newScale, Point newCenter) {
AffineTransform currentTransform =
canvas.getRenderingTransform();
double currentScale =
currentTransform.getScaleX(); //We also scale X and Y together, so just getting
X here is sufficient
double relativeScale = newScale /
currentScale;
AffineTransform newTransform =
AffineTransform.getScaleInstance(newScale,newScale);
;
Rectangle
currRect = getCurrentSection();
;if (newCenter == null)
{
//If the scroll bars are adjusted (non-zero values), then
we want to center the view. ; If not, then we want them to stay
there
int newX;
if (currRect.x ==
0)
; newX = 0;
else
newX = currRect.x + currRect.width /
2;
;int newY;
if (currRect.y ==
0)
; newY = 0;
else
newY = currRect.y + currRect.height /
2;
;//set p to be center of displayed
area
newCenter = new
Point(newX,newY);
}
else
{
newCenter.x +=
currRect.x;
newCenter.y +=
currRect.y;
}
; int halfOfViewWidth = currRect.width
/ 2;
int halfOfViewHeight = currRect.height /
2;
int newX = (int)Math.max(0, (newCenter.x * relativeScale -
halfOfViewWidth));
int newY = (int)Math.max(0, (newCenter.y *
relativeScale - halfOfViewHeight));
zoomPoint = new Point(newX,
newY);
canvas.setRenderingTransform(newTransform);
reset();
}
;private
final class RendererListener implements GVTTreeRendererListener
{
public void gvtRenderingPrepare(GVTTreeRendererEvent e)
{
}
public void
gvtRenderingStarted(GVTTreeRendererEvent e)
{
resizeScrollBars();
if (zoomPoint !=
null) {
if (zoomPoint.x >
getHorizontalScrollBar().getMaximum())
zoomPoint.x
= getHorizontalScrollBar().getMaximum();
if
(zoomPoint.y >
getVerticalScrollBar().getMaximum())
; zoomPoint.y
=
getVerticalScrollBar().getMaximum();
; getHorizontalScrollBar().setValue(zoomPoint.x);
getVerticalScrollBar().setValue(zoomPoint.y);
;}
}
; public
void gvtRenderingCompleted(GVTTreeRendererEvent e)
{
zoomPoint = null;
}
public
void gvtRenderingCancelled(GVTTreeRendererEvent e)
{
}
public void
gvtRenderingFailed(GVTTreeRendererEvent e)
{
}
}
}
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