Hi, I checked the code related to the shading and studied the pdf spec related to the type 6. As I see it is going same as the type 4 >From what I feel this is need to be done correct me if I'm wrong first need to get the 12 control points and colors related to each unit from stream create the 4 cubic Bézier curves which are boundaries of each patch ( to find a Bézier curve it need 4 control points, two points are part of the curve ) given point need to find the point which patch (I think this can be done[1]<http://en.wikipedia.org/wiki/Plane_%28geometry%29>but need research on that) find the color of the point using bi linear interpolation
This has the same structure as the other shading types but need to structure to keep Bézier curves and patches and patches are connected as in the type4 I have to study the type 7 but I think its similar to this please give feedback on my approach [1]http://en.wikipedia.org/wiki/Plane_%28geometry%29<http://en.wikipedia.org/wiki/Plane_%28geometry%29> On Sun, Mar 2, 2014 at 11:18 AM, Thimal Kempitiya <[email protected]>wrote: > yeah I'm using trunk code(2.0) and I wanted to render the image got it, > thanks. I'm currently studying the 1 to 5 shading implementations and the > pdf spec related to 6 and 7 type shading and i'll buzz you if i got issue. > Once again thanks for quick reply > > > On Sat, Mar 1, 2014 at 2:38 AM, John Hewson <[email protected]> wrote: > >> You'll need to use the latest 2.0.0 snapshot jar, which is the unstable >> version from trunk >> and the place where new development occurs. >> >> -- John >> >> On 28 Feb 2014, at 05:04, Thimal Kempitiya <[email protected]> wrote: >> >> > Hi, >> > I'm Thimal Kempitiya, third year computer science and engineering >> > undergraduate at university of moratuwa. I'm interested in the project >> idea >> > "implement shading with Coons and tensor-product patch meshes". I have >> the >> > basic knowledge about the cubic Bézier curves", , "bilinear >> interpolation", >> > " and "Bernstein polynomials and i think can manage rest of the >> mathematics >> > needed for this project. Also I have the java knowledge to do the >> > implementation part. >> > >> > I clone the PDFBOX repository and checked the code regarding to the >> shading >> > and I tried some examples in pdfbox cook book. >> > >> > Also I tried code to work with the type 1 shading type. >> > >> > File f=new File("C:\\asy-latticeshading.pdf"); >> > try { >> > PDDocument doc=PDDocument.load(f); >> > PDPage p; >> > p=(PDPage)doc.getDocumentCatalog().getAllPages().get(0); >> > PDShadingType1 pdst1=new PDShadingType1(p.getCOSDictionary()); >> > PDRectangle pdr=p.findCropBox(); >> > PDGraphicsState pdg=new PDGraphicsState(pdr); >> > Matrix m=pdg.getCurrentTransformationMatrix(); >> > Type1ShadingPaint t1sp=new Type1ShadingPaint(pdst1, m, >> > (int)p.findCropBox().getHeight()); >> > >> > But this give me error saying unknown shading type 0 >> > java.io.IOException: Error: Unknown shading type 0 >> > >> > can you please tell me what I'm doing wrong here and how can i solve >> this. >> > -- >> > >> > >> > >> > >> > *Thimal Kempitiya <http://www.facebook.com/thimalk> >> UndergraduateDepartment >> > of Computer Science and Engineering University of Moratuwa.* >> >> > > > -- > > > > > *Thimal Kempitiya <http://www.facebook.com/thimalk> > UndergraduateDepartment of Computer Science and Engineering University of > Moratuwa.* > -- *Thimal Kempitiya <http://www.facebook.com/thimalk> UndergraduateDepartment of Computer Science and Engineering University of Moratuwa.*
