在启动服务器ntpd服务时遇到一个问题

0.1. 资料

泡泡机器人

github
example

opengl中摄像机的位置,观察的方向

gluLookAt函数

图片 1

图片 2

图片 3

0.2. 使用说明

使用这个gluLookAt矩阵坐标观察矩阵可以很高效地把所有世界坐标变换为观察坐标LookAt矩阵

find_package(Pangolin REQUIRED)
include_directories(${Pangolin_INCLUDE_DIRS})

target_link_libraries(pangolin_test ${Pangolin_LIBRARIES})

Github 下有个example有一些例子,简单的参照着写,复杂的估计需要查opengl.

使用 su root 切换到root用户后,不可以使用service命令;

0.3. HelloPangolin

#include <iostream>
#include <pangolin/pangolin.h>

int main(int argc, char **argv)
{
    //创建一个窗口
    pangolin::CreateWindowAndBind("Main",640,480);
    //启动深度测试
    glEnable(GL_DEPTH_TEST);

    // Define Projection and initial ModelView matrix
    pangolin::OpenGlRenderState s_cam(
            pangolin::ProjectionMatrix(640,480,420,420,320,240,0.2,100),
            //对应的是gluLookAt,摄像机位置,参考点位置,up vector(上向量)
            pangolin::ModelViewLookAt(0,-10,0.1,0,0,0,pangolin::AxisNegY)
    );

    // Create Interactive View in window
    pangolin::Handler3D handler(s_cam);
    //setBounds 跟opengl的viewport 有关
    //看SimpleDisplay中边界的设置就知道
    pangolin::View &d_cam = pangolin::CreateDisplay().SetBounds(0.0,1.0,0.0,1.0,-640.0f/480.0f)
                            .SetHandler(&handler);

    while(!pangolin::ShouldQuit())
    {
        // Clear screen and activate view to render into
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        d_cam.Activate(s_cam);

        // Render OpenGL Cube
//        pangolin::glDrawColouredCube();\
        //坐标轴的创建
        pangolin::glDrawAxis(3);

        //点的创建
        glPointSize(10.0f);
        glBegin(GL_POINTS);
        glColor3f(1.0,1.0,1.0);
        glVertex3f(0.0f,0.0f,0.0f);
        glVertex3f(1,0,0);
        glVertex3f(0,2,0);
        glEnd();

        //把下面的点都做一次旋转变换
        glPushMatrix();
        //col major
        std::vector<GLfloat > Twc = {1,0,0,0, 0,1,0,0 , 0,0,1,0 ,0,0,5,1};
        glMultMatrixf(Twc.data());

        //直线的创建
        const float w = 2;
        const float h = w*0.75;
        const float z = w*0.6;
        glLineWidth(2);
        glColor3f(1.0,0,0);
        glBegin(GL_LINES);

        glVertex3f(0,0,0);
        glVertex3f(w,h,z);
        glVertex3f(0,0,0);
        glVertex3f(w,-h,z);
        glVertex3f(0,0,0);
        glVertex3f(-w,-h,z);
        glVertex3f(0,0,0);
        glVertex3f(-w,h,z);
        glVertex3f(w,h,z);
        glVertex3f(-w,h,z);
        glVertex3f(-w,h,z);
        glVertex3f(-w,-h,z);
        glVertex3f(-w,-h,z);
        glVertex3f(w,-h,z);
        glVertex3f(w,-h,z);
        glVertex3f(w,h,z);
        glEnd();

        glPopMatrix();

        // Swap frames and Process Events
        pangolin::FinishFrame();
    }

    return 0;

}

使用 su – 后,就可以使用service命令了。

0.4. Plot data with ros

参照SimplePlot, !pangolin::ShouldQuit()换成ros::ok(),就可以

参照SimpleDisplay, 可以做出选项配置

原因:

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