Hi List

I'm rather confused about the location of fpvectorial, since I can find it in several places.

I'm using fpc 2.4.4 and trunk of Lazarus, and fpvectorial exists both places but with different
setups.

The wiki page states to download from lazarus trunk, but the example files there do no use
the lazarus package, but rather the one from fpc.

Is it best to use the lazarus/components version or the fpc version?

Kind regards,
Torsten Bonde Christiansen.

I moved fpvectorial out of fpc because I found it too slow/problematic for me to develop inside the FCL. it was bothersome to rebuild the FCL and reconfigure the environment noting that I develop across 5 different setups on a daily basis (Mac+2 virtual machines + dual boot on another computer). If I install an older compiler then my library is not available, users don't get fixes until a new release is done, etc.

Not to mention that my renderer code requires TCanvas features which are not yet in TFPCustomCanvas and also that I'd like to use the powerful lazutils package.

fpvectorial was never released in compiled form with any FPC release, so you will only have it installed from FPC if you are using an old fpc trunk snapshot or something like that.

Torsten Bonde Christiansen wrote

The wiki page states to download from lazarus trunk, but the example files there do no use the lazarus package, but rather the one from fpc.

Please file a bug report.

Is it best to use the lazarus/components version or the fpc version?

Yes, lazarus/components

The fpc version no longer exists.

In our previous episode, Torsten Bonde Christiansen said:

The author has retracted fpvectorial from FPC after the 2.4.4 release, afaik because he wanted to access some utf8 units of Lazarus from fpvectorial. I'm not sure if that is a temporary thing or not.

Its compilation in snapshots on the 2.6 and 2.7.x branches has been disabled.

A dependency on the LCL TCanvas means that fpVectorial will not be usable in a CGI (or web) environment.

Can you tell me what is missing in TFPCustomCanvas, so we can add it ?

Michael.

I've downloaded the releases_2_4_4 from the svn repository. The source code is included
but you are right that it is not compiled.

Bug report filed: http://bugs.freepascal.org/view.php?id=20662

I noted that after I sent the mail. But thank you for the reply.

Kind regards,
Torsten Bonde Christiansen.

Can you tell me what is missing in TFPCustomCanvas, so we can add it ?

Here:

http://svn.freepascal.org/cgi-bin/viewvc.cgi/trunk/components/fpvectorial/fpvtocanvas.pas?view=markup&revision=33181&root=lazarus

all parts are isolated with ifdef USE_LCL_CANVAS, so rebuilding for CGI support is actually trivial: just comment the define or use LCL-nogui, but then the rendering gets crippled:

Missing parts are:

TCanvas.PolyBezier
TCanvas.Font.Orientation

A very problematic part is ClipRects. It is impossible to ignore them in PostScript (ps, eps, pdf), the drawing gets completely deformed if you do that, and the LCL implements them via LCLIntf:

  184     OldClipRegion := LCLIntf.CreateEmptyRegion();
  185     GetClipRgn(ACanvas.Handle, OldClipRegion);
  186     ClipRegion := ConvertPathToRegion(CurPath.ClipPath, ADestX,
ADestY, AMulX, AMulY);
  187     SelectClipRgn(ACanvas.Handle, ClipRegion);
  188     DeleteObject(ClipRegion);

This one I think is missing:

  444     ALCLDest.Arc(
  445       BoundsLeft, BoundsTop, BoundsRight, BoundsBottom,
  446       IntStartAngle, IntAngleLength
  447       );

Some parts which I still dont use, but will:

Pen.EndCap, joint, startcap

MSEgui has a Pascal implementation of clip regions: http://gitorious.org/mseide-msegui/mseide-
msegui/blobs/master/lib/common/graphics/msegenericgdi.pas

Martin

Martin Schreiber wrote

MSEgui has a Pascal implementation of clip regions: http://gitorious.org/mseide-msegui/mseide-msegui/blobs/master/lib/common/graphics/msegenericgdi.pas

It seams that it supports only rectangles as primitives, correct?

fpvectorial uses mostly polygonal regions.

Felipe Monteiro de Carvalho wrote

On Thu, Nov 10, 2011 at 10:28 AM, Martin Schreiber

Rectangles and regions. Not tested well BTW. I used it for the MSEgui OpenGL backend.
Non rectangular region definitions are normally converted to rect-regions first before doing operations AFAIK. segmentellipsef() can be used to stripe an ellipse for example.

Martin