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Home » Eclipse Projects » Standard Widget Toolkit (SWT) » GC.drawArc/fillArc results in different effects when antialias on/off?
GC.drawArc/fillArc results in different effects when antialias on/off? [message #462421] Wed, 12 October 2005 05:38 Go to next message
Zhiqiang Qian is currently offline Zhiqiang Qian
Messages: 76
Registered: July 2009
Member
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Hi all,

Here is the problem I encountered:

If I turn on/off AA capability and call GC.drawArc() or GC.fillArc(), the
resulting effects are different. It looks the GC uses two differnt
algorithms to
determint the arc start angle and extent. This blocks me on trying to
render a
pie slice contour using SWT, I uses the following code to calculate the
start
and end points of the arc:

============================================================ ==================
int xcenter = (int) ( bounds.getTopLeft( ).getX( ) + bounds.getWidth( )
/ 2d );
int ycenter = (int) ( bounds.getTopLeft( ).getY( ) + bounds.getHeight( )
/ 2d );

double angle = Math.toRadians( -getStartAngle( ) );

int xstart = (int) ( bounds.getTopLeft( ).getX( ) + ( Math.cos( angle )
* 0.5 +
0.5 ) * bounds.getWidth( ) );
int ystart = (int) ( bounds.getTopLeft( ).getY( ) + ( Math.sin( angle )
* 0.5 +
0.5 ) * bounds.getHeight( ) );

angle = Math.toRadians( -getStartAngle( ) - getAngleExtent( ) );

int xend = (int) ( bounds.getTopLeft( ).getX( ) + ( Math.cos( angle ) *
0.5 +
0.5 ) * bounds.getWidth( ) );
int yend = (int) ( bounds.getTopLeft( ).getY( ) + ( Math.sin( angle ) *
0.5 +
0.5 ) * bounds.getHeight( ) );

if ( getStyle( ) == CLOSED )
{
_gc.drawLine( xstart, ystart, xend, yend );
}
else if ( getStyle( ) == SECTOR )
{
_gc.drawLine( xcenter, ycenter, xstart, ystart );
_gc.drawLine( xcenter, ycenter, xend, yend );
}
============================================================ ==================

This works fine previously and when antialias turned off, but fails when
AA is
on. I noticed setAlpha() will break this as well and everything is fine for
GC.drawRectangle() and GC.fillRectangle().

here is the simple test code:

==================================================
gc.setBackground(ColorConstants.blue);

gc.drawRectangle(10, 10, 200, 100);
gc.drawArc(10, 10, 200, 100, -45, 45);
gc.fillArc(10, 10, 200, 100, 45, 90);

gc.setAdvanced(false);
gc.setAntialias(1);
//gc.setAlpha(127);

gc.drawRectangle(220, 10, 200, 100);
gc.drawArc(220, 10, 200, 100, -45, 45);
gc.fillArc(220, 10, 200, 100, 45, 90);

gc.setAdvanced(false);
==================================================

I'm using a WindowsXP + JDK1.4 + SWT3.1, not sure if it's ok on other
platforms. Any tips or comments are highly appreciated, thanks.


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--------------060905040907030103010907--
Re: GC.drawArc/fillArc results in different effects when antialias on/off? [message #463385 is a reply to message #462421] Fri, 04 November 2005 19:14 Go to previous message
Steve Northover is currently offline Steve Northover
Messages: 1636
Registered: July 2009
Senior Member
Please enter a bug report.

"Zhiqiang Qian" <zqian@actuate.com> wrote in message
news:dii7ek$ich$1@news.eclipse.org...
> Hi all,
>
> Here is the problem I encountered:
>
> If I turn on/off AA capability and call GC.drawArc() or GC.fillArc(), the
> resulting effects are different. It looks the GC uses two differnt
> algorithms to
> determint the arc start angle and extent. This blocks me on trying to
> render a
> pie slice contour using SWT, I uses the following code to calculate the
> start
> and end points of the arc:
>
>
============================================================ ================
==
> int xcenter = (int) ( bounds.getTopLeft( ).getX( ) + bounds.getWidth( )
> / 2d );
> int ycenter = (int) ( bounds.getTopLeft( ).getY( ) + bounds.getHeight( )
> / 2d );
>
> double angle = Math.toRadians( -getStartAngle( ) );
>
> int xstart = (int) ( bounds.getTopLeft( ).getX( ) + ( Math.cos( angle )
> * 0.5 +
> 0.5 ) * bounds.getWidth( ) );
> int ystart = (int) ( bounds.getTopLeft( ).getY( ) + ( Math.sin( angle )
> * 0.5 +
> 0.5 ) * bounds.getHeight( ) );
>
> angle = Math.toRadians( -getStartAngle( ) - getAngleExtent( ) );
>
> int xend = (int) ( bounds.getTopLeft( ).getX( ) + ( Math.cos( angle ) *
> 0.5 +
> 0.5 ) * bounds.getWidth( ) );
> int yend = (int) ( bounds.getTopLeft( ).getY( ) + ( Math.sin( angle ) *
> 0.5 +
> 0.5 ) * bounds.getHeight( ) );
>
> if ( getStyle( ) == CLOSED )
> {
> _gc.drawLine( xstart, ystart, xend, yend );
> }
> else if ( getStyle( ) == SECTOR )
> {
> _gc.drawLine( xcenter, ycenter, xstart, ystart );
> _gc.drawLine( xcenter, ycenter, xend, yend );
> }
>
============================================================ ================
==
>
> This works fine previously and when antialias turned off, but fails when
> AA is
> on. I noticed setAlpha() will break this as well and everything is fine
for
> GC.drawRectangle() and GC.fillRectangle().
>
> here is the simple test code:
>
> ==================================================
> gc.setBackground(ColorConstants.blue);
>
> gc.drawRectangle(10, 10, 200, 100);
> gc.drawArc(10, 10, 200, 100, -45, 45);
> gc.fillArc(10, 10, 200, 100, 45, 90);
>
> gc.setAdvanced(false);
> gc.setAntialias(1);
> //gc.setAlpha(127);
>
> gc.drawRectangle(220, 10, 200, 100);
> gc.drawArc(220, 10, 200, 100, -45, 45);
> gc.fillArc(220, 10, 200, 100, 45, 90);
>
> gc.setAdvanced(false);
> ==================================================
>
> I'm using a WindowsXP + JDK1.4 + SWT3.1, not sure if it's ok on other
> platforms. Any tips or comments are highly appreciated, thanks.
>
>


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