visualization/offscreen/offscreen.java

Refer to the Offscreen Rendering Example.

// ****************************************************************************
// $Id$
//
// Copyright (C) 2008-2014, Roman Lygin. All rights reserved.
// Copyright (C) 2014-2023, CADEX. All rights reserved.
//
// This file is part of the CAD Exchanger software.
//
// You may use this file under the terms of the BSD license as follows:
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// ****************************************************************************
 
import cadex.*;
import java.io.File;
import java.net.URLDecoder;
 
public class offscreen {
    static {
        try {
            System.loadLibrary("CadExCore");
            System.loadLibrary("CadExView");
        } catch (UnsatisfiedLinkError e) {
            System.err.println("Native code library failed to load.\n" + e);
            System.exit(1);
        }
    }
 
    public static void main(String[] args) {
        String anAbsolutePathToRuntimeKey = "";
        // Activate the license
        try {
            File aRuntimeKeyFile = new File(offscreen.class.getProtectionDomain().getCodeSource().getLocation().toURI().getPath());
            anAbsolutePathToRuntimeKey = aRuntimeKeyFile.getPath() + "/runtime_key.lic";
        }
        catch (Exception ex) {
            System.out.println("Failed to resolve runtime key path.");
            System.exit(1);
        }
        if (!LicenseManager.CADExLicense_ActivateRuntimeKeyFromAbsolutePath(anAbsolutePathToRuntimeKey)) {
            System.out.println("Failed to activate CAD Exchanger license.");
            System.exit(1);
        }
 
        if (args.length != 2) {
            System.out.println("Usage: " + " <input_file> <output_file>, where:");
            System.out.println("    <input_file>  is a name of the STEP file to be read");
            System.out.println("    <output_file> is a name of the PNG  file to be written");
            System.exit(1);
        }
 
        String aSource = args[0];
        String aDest = args[1];
 
        ModelData_ModelReader aReader = new ModelData_ModelReader();
 
        ModelData_Model aModel = new ModelData_Model();
 
        // Opening and converting the file
        if (!aReader.Read(new Base_UTF16String(aSource), aModel)) {
            System.out.println("Failed to open and convert the file " + aSource);
            System.exit(1);
        }
 
        // Use exceptions to get human-readable errors on fail
        Base_Settings.Default().SetValue (Base_Settings.Id.UseExceptions, true);
 
        try {
 
            // Convert model into visualization entities
            ModelPrs_SceneNodeFactory aFactory = new ModelPrs_SceneNodeFactory();
            ModelPrs_SceneNode aRootNode = aFactory.CreateGraph(aModel,ModelData_RepresentationMask.ModelData_RM_Any);
            aRootNode.SetDisplayMode(ModelPrs_DisplayMode.ModelPrs_DM_ShadedWithBoundaries);
 
            // Create scene and display all entities
            ModelPrs_Scene aScene = new ModelPrs_Scene();
            aScene.AddRoot(aRootNode);
 
            // Setup offscreen viewport with transparent background and perspective camera
            ModelPrs_OffscreenViewPort aViewPort = new ModelPrs_OffscreenViewPort();
            aViewPort.Resize(800, 600);
            aViewPort.SetCameraProjectionType(ModelPrs_CameraProjectionType.ModelPrs_CPT_Perspective);
            aViewPort.SetCameraPositionType(ModelPrs_CameraPositionType.ModelPrs_CMT_Default);
            ModelData_Color aBackgroundColor = new ModelData_Color(0x00000000);
            ModelPrs_BackgroundStyle aStyle = new ModelPrs_BackgroundStyle(aBackgroundColor);
            aViewPort.SetBackgroundStyle(aStyle);
 
            // Attach viewport to the scene.
            if (!aViewPort.AttachToScene(aScene)) {
                System.out.println("Unable to attach viewport to scene");
                System.exit(1);
            }
 
            // Apply scene changes to viewport and wait until all async operations will be finished
            aScene.Update();
            aScene.Wait();
 
            // Fit and center model on the image
            aViewPort.FitAll();
 
            // Grab rendered frame into image
            if (!aViewPort.GrabToImage(new Base_UTF16String(aDest))) {
                System.out.println("Failed to write the file " + aDest);
                System.exit(1);
            }
 
        } catch(Base_Exception theErr) {
            System.out.println(theErr.What());
            System.exit(1);
        }
    }
}