hardcopy_overview - Online Linux Manual PageSection : 3
Updated : Mon Jan 25 2021
Source : Version 2.5.0
Note : Coin

NAMEhardcopy_overview − An overview of the hardcopy support​. The main API for HardCopy support in Coin is the abstract class SoVectorizeAction​. SoVectorizeAction will extract geometry from an Inventor scene graph, and project the geometry onto a specified page​. Since postscript and other vector based file formats do not support z-buffer or depth clipping, all geometry is rendered using a simple painter's algorithm (geometry is sorted based on distance to camera)​. SoVectorizePSAction inherits SoVectorizeAction, and will output a Postscript file​. Texture-mapped polygons are not supported, since this is not supported by the vector file formats, at least it's not supported in Postscript​. Gouraud shading is not supported in the Postscript language (at least not for V2​.0), but an approximation is implemeting using an algorithm that divides the triangle into several small (flat-shaded) triangles​. The gouraud shading quality (the number of sub-triangles) is controlled by an epsilon value​. The gouraud shading function is written by Frederic Delhoume (delhoume (at) ilog​.fr), and is free (public domain) software​. Typical use of SoVectorizePSAction is shown in the following piece of code: SoVectorizePSAction * ps = new SoVectorizePSAction; SoVectorOutput * out = ps->getOutput(); if (!out->openFile("output​.ps")) { return -1; // unable to open output file } // to enable gouraud shading​. 0​.1 is a nice epsilon value // ps->setGouraudThreshold(0​.1f); // clear to white background​. Not really necessary if you // want a white background ps->setBackgroundColor(TRUE, SbColor(1​.0f, 1​.0f, 1​.0f)); // select LANDSCAPE or PORTRAIT orientation ps->setOrientation(SoVectorizeAction::LANDSCAPE); // start creating a new page (A4 page, with 10mm border)​. ps->beginPage(SbVec2f(10​.0f, 10​.0f), SbVec2f(190​.0f, 277​.0f)); // There are also enums for A0-A10​. Example: // ps->beginStandardPage(SoVectorizeAction::A4, 10​.0f); // calibrate so that text, lines, points and images will have the // same size in the postscript file as on the monitor​. ps->calibrate(viewer->getViewportRegion()); // apply action on the viewer scenegraph​. Remember to use // SoSceneManager's scene graph so that the camera is included​. ps->apply(viewer->getSceneManager()->getSceneGraph()); // this will create the postscript file ps->endPage(); // close file out->closeFile(); delete ps;It is also possible to have several viewports and/or layers on a page​. This is useful if your application has several layers of geometry, for instance some annotations in 2D on top of a 3D scene graph​. To create several layers, the beginViewport() and endViewport() functions can be used​. Since Coin 2​.1 TGS provides HardCopy support as a separate extension for TGS Inventor​.
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