我试图让 QGLViewer 应用程序在 Windows 上运行，但依赖管理正在制作中。首先，是否有一个可以理解的概述在客户端应用程序、Qt、QGLViewer、OpenGL、FreeGLUT/GLUT 之间共享的依赖关系？应该使用 CMake 导入哪些依赖项？c++ 头文件中有什么导入？哪些依赖项是平台相关的？
我在编译时遇到的错误：
Error LNK2019 unresolved external symbol __imp_glBegin referenced in function "protected: virtual void __cdecl Viewer::draw(void)" (?draw@Viewer@@MEAAXXZ) testQTQL path\to\simpleViewer.obj 1
使用以下示例：
cmake_minimum_required(VERSION 3.5)
include(../path/to/conanbuildinfo.cmake)
conan_basic_setup()
find_package(Qt5 COMPONENTS Xml OpenGL Gui Core Widgets REQUIRED)
set(TARGET_NAME testQTQL)
add_executable(
${TARGET_NAME}
${CMAKE_CURRENT_SOURCE_DIR}/main.cpp
${CMAKE_CURRENT_SOURCE_DIR}/simpleViewer.h
${CMAKE_CURRENT_SOURCE_DIR}/simpleViewer.cpp
)
target_include_directories(
${TARGET_NAME} PRIVATE ${CONAN_INCLUDE_DIRS_QGLVIEWER})
target_link_libraries(
${TARGET_NAME}
${CONAN_LIBS_QGLVIEWER}
Qt5::Core
Qt5::Gui
Qt5::Xml
Qt5::OpenGL
Qt5::Widgets
)
在 conan build 中有 QGLViewer 和 QGLViewer.lib 和 .dll 的包含文件夹。已安装 Qt 5.15。
主文件
#include "simpleViewer.h"
#include <QtWidgets/qapplication.h>
int main(int argc, char** argv) {
// Read command lines arguments.
QApplication application(argc, argv);
// Instantiate the viewer.
Viewer viewer;
viewer.setWindowTitle("simpleViewer");
// Make the viewer window visible on screen.
viewer.show();
// Run main loop.
return application.exec();
}
简单查看器.h
#include <QGLViewer/qglviewer.h>
class Viewer : public QGLViewer {
protected:
virtual void draw();
virtual void init();
virtual QString helpString() const;
};
简单查看器.cpp
#include "simpleViewer.h"
using namespace std;
// Draws a spiral
void Viewer::draw() {
const float nbSteps = 200.0;
glBegin(GL_QUAD_STRIP);
for (int i = 0; i < nbSteps; ++i) {
const float ratio = i / nbSteps;
const float angle = 21.0 * ratio;
const float c = cos(angle);
const float s = sin(angle);
const float r1 = 1.0 - 0.8f * ratio;
const float r2 = 0.8f - 0.8f * ratio;
const float alt = ratio - 0.5f;
const float nor = 0.5f;
const float up = sqrt(1.0 - nor * nor);
glColor3f(1.0 - ratio, 0.2f, ratio);
glNormal3f(nor * c, up, nor * s);
glVertex3f(r1 * c, alt, r1 * s);
glVertex3f(r2 * c, alt + 0.05f, r2 * s);
}
glEnd();
}
void Viewer::init() {
// Restore previous viewer state.
restoreStateFromFile();
// Opens help window
help();
}
QString Viewer::helpString() const {
QString text("<h2>S i m p l e V i e w e r</h2>");
text += "Use the mouse to move the camera around the object. ";
text += "You can respectively revolve around, zoom and translate with the "
"three mouse buttons. ";
text += "Left and middle buttons pressed together rotate around the camera "
"view direction axis<br><br>";
text += "Pressing <b>Alt</b> and one of the function keys "
"(<b>F1</b>..<b>F12</b>) defines a camera keyFrame. ";
text += "Simply press the function key again to restore it. Several "
"keyFrames define a ";
text += "camera path. Paths are saved when you quit the application and "
"restored at next start.<br><br>";
text +=
"Press <b>F</b> to display the frame rate, <b>A</b> for the world axis, ";
text += "<b>Alt+Return</b> for full screen mode and <b>Control+S</b> to save "
"a snapshot. ";
text += "See the <b>Keyboard</b> tab in this window for a complete shortcut "
"list.<br><br>";
text += "Double clicks automates single click actions: A left button double "
"click aligns the closer axis with the camera (if close enough). ";
text += "A middle button double click fits the zoom of the camera and the "
"right button re-centers the scene.<br><br>";
text += "A left button double click while holding right button pressed "
"defines the camera <i>Revolve Around Point</i>. ";
text += "See the <b>Mouse</b> tab and the documentation web pages for "
"details.<br><br>";
text += "Press <b>Escape</b> to exit the viewer.";
return text;
}