Home » Eclipse Projects » GEF » Rounding errors in figure drawing
| Rounding errors in figure drawing [message #145925] |
Mon, 02 August 2004 15:10  |
 Bradley Schmerl
Messages: 26
Registered: July 2009 |
Junior Member |
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This is a multi-part message in MIME format.
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Hi:
I'm having problems with rounding errors in figure painting when zooming
(see the attached shot). I am passing in the same rectangle to
outlineShape as I am to fillShape, but the outline seems to be bigger
than the inside when zooming in (in the screenshot, the zoom level is
400%). It only seems to be happening on figures that have curves in them
(circles, rounded rectangles).
In fillShape, I am using:
g.fillOval (r) and g.fillRoundedRectangle (r, r.width/6, r.height/6)
In outlineShap, I am using:
g.drawOval (r) and g.drawRoundedRectangle (r, r.width/6, r.height/6)
Has anyone experienced this problem? If so, and I am doing something
wrong, could you tell me the right way. If there is a workaround, I'd
like to know that too.
Thanks,
Bradley.
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--------------020800070202060304050505--
|
|
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| Re: Rounding errors in figure drawing [message #145949 is a reply to message #145925] |
Mon, 02 August 2004 16:09  |
Pratik Shah
Messages: 1077
Registered: July 2009 |
Senior Member |
|
|
Open a bug report (and please provide a snippet, if possible). This works
fine at all zoom levels other than 400%, right?
"Bradley Schmerl" <schmerl@cs.cmu.edu> wrote in message
news:cellci$sfq$1@eclipse.org...
> Hi:
>
> I'm having problems with rounding errors in figure painting when zooming
> (see the attached shot). I am passing in the same rectangle to
> outlineShape as I am to fillShape, but the outline seems to be bigger
> than the inside when zooming in (in the screenshot, the zoom level is
> 400%). It only seems to be happening on figures that have curves in them
> (circles, rounded rectangles).
>
> In fillShape, I am using:
>
> g.fillOval (r) and g.fillRoundedRectangle (r, r.width/6, r.height/6)
>
> In outlineShap, I am using:
>
> g.drawOval (r) and g.drawRoundedRectangle (r, r.width/6, r.height/6)
>
> Has anyone experienced this problem? If so, and I am doing something
> wrong, could you tell me the right way. If there is a workaround, I'd
> like to know that too.
>
> Thanks,
> Bradley.
>
------------------------------------------------------------ ----------------
----
|
|
| |
| Re: Rounding errors in figure drawing [message #146008 is a reply to message #145925] |
Mon, 02 August 2004 19:05 |
Eclipse User |
|
|
|
Originally posted by: none.us.ibm.com
When doing drawRectangle() and fillRectangle(), "fills" needs to be 1 pixel
larger than "draws". This is because fill is exclusive of the bottom and
right edges, while draw is inclusive of all edges. So once you use 1-pixel
larger, you will be tucking the fill underneath the draw, and zoom will work
correctly. Ovals should work the same too.
roundedRectangle is another story. Different arcs may be used and they may
not scale perfectly.
The logic example uses many of the graphics calls and works well with zoom.
"Bradley Schmerl" <schmerl@cs.cmu.edu> wrote in message
news:cellci$sfq$1@eclipse.org...
> Hi:
>
> I'm having problems with rounding errors in figure painting when zooming
> (see the attached shot). I am passing in the same rectangle to
> outlineShape as I am to fillShape, but the outline seems to be bigger
> than the inside when zooming in (in the screenshot, the zoom level is
> 400%). It only seems to be happening on figures that have curves in them
> (circles, rounded rectangles).
>
> In fillShape, I am using:
>
> g.fillOval (r) and g.fillRoundedRectangle (r, r.width/6, r.height/6)
>
> In outlineShap, I am using:
>
> g.drawOval (r) and g.drawRoundedRectangle (r, r.width/6, r.height/6)
>
> Has anyone experienced this problem? If so, and I am doing something
> wrong, could you tell me the right way. If there is a workaround, I'd
> like to know that too.
>
> Thanks,
> Bradley.
>
------------------------------------------------------------ ----------------
----
|
|
| |
| Re: Rounding errors in figure drawing [message #146254 is a reply to message #146217] |
Tue, 03 August 2004 13:57 |
| Eclipse User |
|
|
|
Originally posted by: none.us.ibm.com
You'll have to post your code. FillPolyong is used in the logic example and
it work ok.
"Holger Herzog" <holger.herzog@arcway.com> wrote in message
news:cenvij$6t7$1@eclipse.org...
> Hi!
>
> Randy Hudson wrote:
> > When doing drawRectangle() and fillRectangle(), "fills" needs to be 1
> > pixel larger than "draws". This is because fill is exclusive of the
> > bottom and right edges, while draw is inclusive of all edges. So once
> > you use 1-pixel larger, you will be tucking the fill underneath the
> > draw, and zoom will work correctly. Ovals should work the same too.
>
> I'm using:
>
> graphics.fillPolygon() and
> graphics.drawPolyline()
>
> I have similar effectes: the drawings made by fillPolygon() are one
> pixel smaller (at the right und at the bottom) as that ones made by
> drawPolyline().
>
> Of course, I could add 1 pixel to the points at the right and at the
> bottom. But who knowns what points these are? A polygon can get quite
> complex ...
>
>
> Regards,
>
> Holger
|
|
|
| Re: Rounding errors in figure drawing [message #146798 is a reply to message #146254] |
Sat, 07 August 2004 22:58 |
Bradley Schmerl
Messages: 26
Registered: July 2009 |
Junior Member |
|
|
For me, fillPolygon and drawPolygon zoom ok. fill/drawRectangle,
fill/drawOval, and fill/drawRoundedRectangle do not. Adding one pixel in
each direction to these methods works for me.
Bradley.
Randy Hudson wrote:
> You'll have to post your code. FillPolyong is used in the logic example and
> it work ok.
>
> "Holger Herzog" <holger.herzog@arcway.com> wrote in message
> news:cenvij$6t7$1@eclipse.org...
>
>>Hi!
>>
>>Randy Hudson wrote:
>> > When doing drawRectangle() and fillRectangle(), "fills" needs to be 1
>> > pixel larger than "draws". This is because fill is exclusive of the
>> > bottom and right edges, while draw is inclusive of all edges. So once
>> > you use 1-pixel larger, you will be tucking the fill underneath the
>> > draw, and zoom will work correctly. Ovals should work the same too.
>>
>>I'm using:
>>
>>graphics.fillPolygon() and
>>graphics.drawPolyline()
>>
>>I have similar effectes: the drawings made by fillPolygon() are one
>>pixel smaller (at the right und at the bottom) as that ones made by
>>drawPolyline().
>>
>>Of course, I could add 1 pixel to the points at the right and at the
>>bottom. But who knowns what points these are? A polygon can get quite
>>complex ...
>>
>>
>>Regards,
>>
>>Holger
>
>
>
|
|
|
| Re: Rounding errors in figure drawing [message #146943 is a reply to message #146798] |
Mon, 09 August 2004 18:06 |
| Eclipse User |
|
|
|
Originally posted by: none.us.ibm.com
"Bradley Schmerl" <schmerl@cs.cmu.edu> wrote in message
news:cf3mnb$j52$1@eclipse.org...
> For me, fillPolygon and drawPolygon zoom ok. fill/drawRectangle,
> fill/drawOval, and fill/drawRoundedRectangle do not. Adding one pixel in
> each direction to these methods works for me.
>
> Bradley.
So that's what I was saying about fills. It need to have one pixel more to
be the same size. This is true at 100%, so it is true at 300% also.
|
|
|
| Re: Rounding errors in figure drawing [message #156985 is a reply to message #146943] |
Fri, 05 November 2004 13:37 |
Marion Schmid
Messages: 35
Registered: July 2009 |
Member |
|
|
Hello all,
I think I have a similar problem, but it might also be a problem of coding,
don't know...
I added three screenshot to show you the problem I have with zooming and a
shape, that's done with graphics.drawLine / drawPolygon(..) and
fillPolygon().
The screenshots I added are at zoom levels 150, 200,210. I also had problems
with 100, that's why I think it's maybe my coding where the problem is. But
maybe someone of you can tell me why... ??
As you will see in outlineShape(), I tried with drawPolygon and with
drawLine - both with the same results.
==== MyShape extends Shape =====
protected void fillShape(Graphics g) {
double insetProportion = 0.27;
Rectangle r = getBounds().getCopy().expand(1,1); //translate(-1,
0).shrink((lineWidth-1)/2,(lineWidth-1)/2);
double cornerInsetX = r.width * insetProportion;
double cornerInsetY = r.height/2;
PrecisionPoint pp = new PrecisionPoint(r.getLeft().x + cornerInsetX,
r.getTop().y+cornerInsetY);
PointList pl = new PointList();
pl.addPoint(r.getTopLeft());
pl.addPoint(r.getTopRight());
pl.addPoint(r.getBottomRight());
pl.addPoint(r.getBottomLeft());
pl.addPoint(pp);
g.fillPolygon(pl);
}
protected void outlineShape(Graphics g) {
Rectangle r = getBounds().getCopy();
double cornerInsetX = r.width * insetProportion;
double cornerInsetY = r.height/2;
PrecisionPoint pp = new PrecisionPoint(r.getLeft().x + cornerInsetX,
r.getTop().y+cornerInsetY);
// ### polygon version ###
PointList pl = new PointList();
pl.addPoint(r.getTopLeft());
pl.addPoint(r.getTopRight());
pl.addPoint(r.getBottomRight());
pl.addPoint(r.getBottomLeft());
pl.addPoint(pp);
g.drawPolygon(pl);
// ### drawLine version ### /**
g.drawLine(r.getTopLeft(), r.getTopRight());
g.drawLine(r.getBottomRight(), r.getTopRight());
g.drawLine(r.getBottomLeft(), r.getBottomRight());
g.drawLine(r.getBottomLeft(), pp);
g.drawLine(pp, r.getTopLeft());
*/
}
====== MyEditPart =========
protected IFigure createFigure() {
MyShape ppfigure = new MyShape();
ppfigure.setLayoutManager(new BorderLayout());
ppfigure.setOpaque(false);
ppfigure.setBackgroundColor(ColorConstants.VisualComposerCol ors.COLOR_RED_AC
TIVE);
ppfigure.setForegroundColor(ColorConstants.VisualComposerCol ors.COLOR_RED_BO
RDER);
return ppfigure;
}
"Randy Hudson" <none@us.ibm.com> wrote in message
news:cf8ea5$22m$1@eclipse.org...
> "Bradley Schmerl" <schmerl@cs.cmu.edu> wrote in message
> news:cf3mnb$j52$1@eclipse.org...
> > For me, fillPolygon and drawPolygon zoom ok. fill/drawRectangle,
> > fill/drawOval, and fill/drawRoundedRectangle do not. Adding one pixel in
> > each direction to these methods works for me.
> >
> > Bradley.
>
> So that's what I was saying about fills. It need to have one pixel more
to
> be the same size. This is true at 100%, so it is true at 300% also.
>
>
|
|
|
| Re: Rounding errors in figure drawing -> Sorry, my mistake! [message #156994 is a reply to message #156985] |
Fri, 05 November 2004 13:53 |
Marion Schmid
Messages: 35
Registered: July 2009 |
Member |
|
|
Sorry!
I want to cancel my previous question!
I just found my problem in fillShape/outlineShape:
For the reference rectangle in fillShape() and outlineShape I now use
Rectangle r = getBounds().getCopy().shrink((lineWidth-1/2),
(lineWidth-1/2));
and everything works, all zoom steps from 10% to 1000%
Best regards,
Marion
"Marion Schmid" <marion.schmid@sap.com> wrote in message
news:cmfvm1$24p$1@eclipse.org...
> Hello all,
>
> I think I have a similar problem, but it might also be a problem of
coding,
> don't know...
> I added three screenshot to show you the problem I have with zooming and a
> shape, that's done with graphics.drawLine / drawPolygon(..) and
> fillPolygon().
>
> The screenshots I added are at zoom levels 150, 200,210. I also had
problems
> with 100, that's why I think it's maybe my coding where the problem is.
But
> maybe someone of you can tell me why... ??
>
> As you will see in outlineShape(), I tried with drawPolygon and with
> drawLine - both with the same results.
>
> ==== MyShape extends Shape =====
> protected void fillShape(Graphics g) {
> double insetProportion = 0.27;
> Rectangle r = getBounds().getCopy().expand(1,1); //translate(-1,
> 0).shrink((lineWidth-1)/2,(lineWidth-1)/2);
> double cornerInsetX = r.width * insetProportion;
> double cornerInsetY = r.height/2;
> PrecisionPoint pp = new PrecisionPoint(r.getLeft().x + cornerInsetX,
> r.getTop().y+cornerInsetY);
>
> PointList pl = new PointList();
> pl.addPoint(r.getTopLeft());
>
> pl.addPoint(r.getTopRight());
> pl.addPoint(r.getBottomRight());
> pl.addPoint(r.getBottomLeft());
> pl.addPoint(pp);
>
> g.fillPolygon(pl);
> }
>
> protected void outlineShape(Graphics g) {
> Rectangle r = getBounds().getCopy();
>
> double cornerInsetX = r.width * insetProportion;
> double cornerInsetY = r.height/2;
>
> PrecisionPoint pp = new PrecisionPoint(r.getLeft().x + cornerInsetX,
> r.getTop().y+cornerInsetY);
>
> // ### polygon version ###
> PointList pl = new PointList();
> pl.addPoint(r.getTopLeft());
>
> pl.addPoint(r.getTopRight());
> pl.addPoint(r.getBottomRight());
> pl.addPoint(r.getBottomLeft());
> pl.addPoint(pp);
>
> g.drawPolygon(pl);
>
> // ### drawLine version ### /**
> g.drawLine(r.getTopLeft(), r.getTopRight());
> g.drawLine(r.getBottomRight(), r.getTopRight());
> g.drawLine(r.getBottomLeft(), r.getBottomRight());
> g.drawLine(r.getBottomLeft(), pp);
> g.drawLine(pp, r.getTopLeft());
> */
> }
>
>
> ====== MyEditPart =========
> protected IFigure createFigure() {
>
> MyShape ppfigure = new MyShape();
> ppfigure.setLayoutManager(new BorderLayout());
> ppfigure.setOpaque(false);
>
>
ppfigure.setBackgroundColor(ColorConstants.VisualComposerCol ors.COLOR_RED_AC
> TIVE);
>
>
ppfigure.setForegroundColor(ColorConstants.VisualComposerCol ors.COLOR_RED_BO
> RDER);
>
> return ppfigure;
> }
>
>
> "Randy Hudson" <none@us.ibm.com> wrote in message
> news:cf8ea5$22m$1@eclipse.org...
> > "Bradley Schmerl" <schmerl@cs.cmu.edu> wrote in message
> > news:cf3mnb$j52$1@eclipse.org...
> > > For me, fillPolygon and drawPolygon zoom ok. fill/drawRectangle,
> > > fill/drawOval, and fill/drawRoundedRectangle do not. Adding one pixel
in
> > > each direction to these methods works for me.
> > >
> > > Bradley.
> >
> > So that's what I was saying about fills. It need to have one pixel more
> to
> > be the same size. This is true at 100%, so it is true at 300% also.
> >
> >
>
>
>
|
|
|
| Re: Rounding errors in figure drawing -> Sorry, my mistake! [message #157336 is a reply to message #156994] |
Mon, 08 November 2004 22:35 |
| Eclipse User |
|
|
|
Originally posted by: none.us.ibm.com
The trick is you cannot draw on your bottom and right edges of your bounds.
You should try calling fillRectangle(getBounds()), and compare your polygon
to that rectangular area. You should be able to overlap it completely.
"Marion Schmid" <marion.schmid@sap.com> wrote in message
news:cmg0l0$bk5$1@eclipse.org...
> Sorry!
> I want to cancel my previous question!
> I just found my problem in fillShape/outlineShape:
>
> For the reference rectangle in fillShape() and outlineShape I now use
>
> Rectangle r = getBounds().getCopy().shrink((lineWidth-1/2),
> (lineWidth-1/2));
>
> and everything works, all zoom steps from 10% to 1000%
>
> Best regards,
> Marion
>
> "Marion Schmid" <marion.schmid@sap.com> wrote in message
> news:cmfvm1$24p$1@eclipse.org...
> > Hello all,
> >
> > I think I have a similar problem, but it might also be a problem of
> coding,
> > don't know...
> > I added three screenshot to show you the problem I have with zooming and
a
> > shape, that's done with graphics.drawLine / drawPolygon(..) and
> > fillPolygon().
> >
> > The screenshots I added are at zoom levels 150, 200,210. I also had
> problems
> > with 100, that's why I think it's maybe my coding where the problem is.
> But
> > maybe someone of you can tell me why... ??
> >
> > As you will see in outlineShape(), I tried with drawPolygon and with
> > drawLine - both with the same results.
> >
> > ==== MyShape extends Shape =====
> > protected void fillShape(Graphics g) {
> > double insetProportion = 0.27;
> > Rectangle r = getBounds().getCopy().expand(1,1); //translate(-1,
> > 0).shrink((lineWidth-1)/2,(lineWidth-1)/2);
> > double cornerInsetX = r.width * insetProportion;
> > double cornerInsetY = r.height/2;
> > PrecisionPoint pp = new PrecisionPoint(r.getLeft().x + cornerInsetX,
> > r.getTop().y+cornerInsetY);
> >
> > PointList pl = new PointList();
> > pl.addPoint(r.getTopLeft());
> >
> > pl.addPoint(r.getTopRight());
> > pl.addPoint(r.getBottomRight());
> > pl.addPoint(r.getBottomLeft());
> > pl.addPoint(pp);
> >
> > g.fillPolygon(pl);
> > }
> >
> > protected void outlineShape(Graphics g) {
> > Rectangle r = getBounds().getCopy();
> >
> > double cornerInsetX = r.width * insetProportion;
> > double cornerInsetY = r.height/2;
> >
> > PrecisionPoint pp = new PrecisionPoint(r.getLeft().x + cornerInsetX,
> > r.getTop().y+cornerInsetY);
> >
> > // ### polygon version ###
> > PointList pl = new PointList();
> > pl.addPoint(r.getTopLeft());
> >
> > pl.addPoint(r.getTopRight());
> > pl.addPoint(r.getBottomRight());
> > pl.addPoint(r.getBottomLeft());
> > pl.addPoint(pp);
> >
> > g.drawPolygon(pl);
> >
> > // ### drawLine version ### /**
> > g.drawLine(r.getTopLeft(), r.getTopRight());
> > g.drawLine(r.getBottomRight(), r.getTopRight());
> > g.drawLine(r.getBottomLeft(), r.getBottomRight());
> > g.drawLine(r.getBottomLeft(), pp);
> > g.drawLine(pp, r.getTopLeft());
> > */
> > }
> >
> >
> > ====== MyEditPart =========
> > protected IFigure createFigure() {
> >
> > MyShape ppfigure = new MyShape();
> > ppfigure.setLayoutManager(new BorderLayout());
> > ppfigure.setOpaque(false);
> >
> >
>
ppfigure.setBackgroundColor(ColorConstants.VisualComposerCol ors.COLOR_RED_AC
> > TIVE);
> >
> >
>
ppfigure.setForegroundColor(ColorConstants.VisualComposerCol ors.COLOR_RED_BO
> > RDER);
> >
> > return ppfigure;
> > }
> >
> >
> > "Randy Hudson" <none@us.ibm.com> wrote in message
> > news:cf8ea5$22m$1@eclipse.org...
> > > "Bradley Schmerl" <schmerl@cs.cmu.edu> wrote in message
> > > news:cf3mnb$j52$1@eclipse.org...
> > > > For me, fillPolygon and drawPolygon zoom ok. fill/drawRectangle,
> > > > fill/drawOval, and fill/drawRoundedRectangle do not. Adding one
pixel
> in
> > > > each direction to these methods works for me.
> > > >
> > > > Bradley.
> > >
> > > So that's what I was saying about fills. It need to have one pixel
more
> > to
> > > be the same size. This is true at 100%, so it is true at 300% also.
> > >
> > >
> >
> >
> >
>
>
|
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