We found some background colors were missing and some got altered in our conversion; The reason for erroneous output was the background colors of the forms on those files were shaded as gradient and patterned.
So I thought of writing this article to overcome this issue for any developers who are interested in implementing a custom XFA to HTML5 conversion tool.
In XFA Gradient shading is mainly divided into linear and radial; Both linear and radial shading require two colors to shade the rectangle area.
<color value=”0,0,255″/> //end color
<color value=”255,255,0″/> //start color
In above example xml shade the area linearly from bottom to top starts with yellow and ends as blue; if color values is not present then main color would be black and secondary would be white;
Linear shading allows toTop, toBottom, toRight and toLeft shading capabilities to XFA borders; However radial shading allows either toEdge or toCenter as parameters.
Similar to linear shading pattern shading requires main fill color and shading color (a color which displays in pattern area)
Pattern allows horizontal, vertical, diaglonal left, diagonal right and cross diagonal parameters for shading the content;
Hopefully you have found this information is useful and if you would like to know any further information please read XFA specification 3.3 for additional content and further information.
IDRsolutions develop a Java PDF library, a PDF forms to HTML5 converter, a PDF to HTML5 or SVG converter and a Java Image Library that doubles as an ImageIO replacement. On the blog our team post about anything interesting they learn about.