Open Inventor显示区域SbViewportRegion

最新推荐文章于 2024-11-01 14:59:25 发布

最新推荐文章于 2024-11-01 14:59:25 发布 · 132 阅读

本文介绍了一种使用C++实现的键盘事件处理功能，通过自定义事件回调函数来控制代理查看器的视口区域。具体展示了如何在用户按下箭头键时，调整视口位置，实现对3D场景的平移操作。

#include <Inventor/Win/SoWin.h> #include <Inventor/Win/viewers/SoWinExaminerViewer.h> #include <Inventor/nodes/SoEventCallback.h> #include <Inventor/nodes/SoSeparator.h> #include <Inventor/nodes/SoCone.h> #include <Inventor/events/SoKeyboardEvent.h> // ************************************************************ static void keypresscbfunc(void * userdata, SoEventCallback * keyboardcb) { SoWinExaminerViewer * viewer = (SoWinExaminerViewer *)userdata; const SoEvent * event = keyboardcb->getEvent(); int shift = 0; if (SO_KEY_PRESS_EVENT(event, U)) { shift = 40; keyboardcb->setHandled(); } else if (SO_KEY_PRESS_EVENT(event, D)) { shift = -40; keyboardcb->setHandled(); } if (keyboardcb->isHandled()) { SbViewportRegion vpr = viewer->getViewportRegion(); SbVec2s size = vpr.getViewportSizePixels(); SbVec2s origin = vpr.getViewportOriginPixels(); origin[1] -= shift; vpr.setViewportPixels(origin, size); viewer->setViewportRegion(vpr); } } // ************************************************************ int main(int argc, char ** argv) { HWND window = SoWin::init(argv[0]); SoSeparator * root = new SoSeparator; root->ref(); root->addChild(new SoCone); SoWinExaminerViewer * viewer = new SoWinExaminerViewer(window); SoEventCallback * eventcb = new SoEventCallback; eventcb->addEventCallback(SoKeyboardEvent::getClassTypeId(), keypresscbfunc, viewer); root->insertChild(eventcb, 0); viewer->setViewing(FALSE); viewer->setDecoration(FALSE); viewer->setSceneGraph(root); viewer->show(); SoWin::show(window); SoWin::mainLoop(); delete viewer; root->unref(); return 0; }