本周软件工程课程感想

由于我们团队项目进行到一半，不便传上来代码。我就这周软件工程课程的内容写一点感想吧。

下面这是我们图形学课程实验的部分代码：

/**********myInit**********/
void myInit()
{
    pn = 0;
    glClearColor(1.0, 1.0, 1.0, 0.0);
    glColor3f(0.2f, 0.2f, 0.9f);
    glPointSize(5.0);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    gluOrtho2D(-300, 300, -300, 300);
}

/**********myDisplay**********/
void myDisplay()
{
    glClear(GL_COLOR_BUFFER_BIT);
    glBegin(GL_LINES);
    glVertex2i(-301, 0);
    glVertex2i(301, 0);
    glVertex2i(0, -301);
    glVertex2i(0, 301);
    glEnd();
    glFlush();
}

/**********myMouse**********/
void myMouse(int button, int state, int x, int y)
{
    if (state == GLUT_DOWN)
    {
        pn++;
        p[pn].px = x - 300;
        p[pn].py = 300 - y;

        glBegin(GL_POINTS);
        glVertex2i(x - 300 , 300 - y);
        glEnd();
        glFlush();
    }
}

/**********main***********/
void main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize(600, 600);
    glutInitWindowPosition(100, 150);
    glutCreateWindow("Tuxingxue2_1");

    //创建菜单，绑定右键
    int menu_id;
    menu_id = glutCreateMenu(right_menu);
    glutAddMenuEntry("Clear Screen", 0);
    glutAddMenuEntry("Draw Line", 1);
    glutAddMenuEntry("Draw Polygon", 2);
    glutAddMenuEntry("Draw Circle", 3);
    glutAddMenuEntry("Translate", 4);
    glutAddMenuEntry("Rotate", 5);
    glutAddMenuEntry("Size", 6);
    glutAddMenuEntry("Exit", 10);
    glutAttachMenu(GLUT_RIGHT_BUTTON);

    myInit();
    glutDisplayFunc(myDisplay);
    glutMouseFunc(myMouse);
    glutMainLoop();
}

//画圆
void DrawCircle(void)
{
    glBegin(GL_POLYGON);
    for (int i = 0; i < n; ++i)
    {
        glVertex2f(0.1*cos(2 * Pi / n*i), 0.1*sin(2 * Pi / n*i));
    }
    glEnd();
    glFlush();
}

//右键菜单内容选择事件在这里触发
void right_menu(int id)
{
    if (id == 10) exit(0);
    else if (id == 0)                            //Clear Screen
    {
        pn = 0;
        glClearColor(1.0, 1.0, 1.0, 0.0);
        glColor3f(0.2f, 0.2f, 0.9f);
        glPointSize(5.0);
        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();
        gluOrtho2D(-300, 300, -300, 300);
        glutPostRedisplay();
    }
    else if (id == 1)                            //Draw Line
    {
        //glClear(GL_COLOR_BUFFER_BIT);
        DrawType = 0;
        glBegin(GL_LINES);
        for (int i = 1; i <= pn; i++)
        {
            glVertex2i(p[i].px, p[i].py);
        }
        glEnd();
        glFlush();
    }
    else if (id == 2)                            //Draw Polygon
    {
        DrawType = 1;
        //glClear(GL_COLOR_BUFFER_BIT);
        glBegin(GL_POLYGON);
        for (int i = 1; i <= pn; i++)
        {
            glVertex2i(p[i].px, p[i].py);
        }
        glEnd();
        glFlush();
    }
    else if (id == 3)                            //Draw Circle
    {
        DrawType = 2;
        //glClear(GL_COLOR_BUFFER_BIT);
        glBegin(GL_POLYGON);
        for (int i = 0; i < n; ++i)
        {
            glVertex2f(p[pn].px + R*cos(2 * Pi / n*i), p[pn].py + R*sin(2 * Pi / n*i));
        }
        glEnd();
        glFlush();
    }
    else if (id == 4)                            //Translate
    {
        glTranslatef(100, 80, 0.0);                //向右移动，向上移动
        glColor3f(0.0, 1.0, 0.0);
        
        switch (DrawType)
        {
        case 0:
            glBegin(GL_LINES);
            for (int i = 1; i <= pn; i++)
            {
                glVertex2i(p[i].px, p[i].py);
            }
            glEnd();
            break;
        case 1:
            glBegin(GL_POLYGON);
            for (int i = 1; i <= pn; i++)
            {
                glVertex2i(p[i].px, p[i].py);
            }
            glEnd();
            break;
        case 2:
            glBegin(GL_POLYGON);
            for (int i = 0; i < n; ++i)
            {
                glVertex2f(p[pn].px + R*cos(2 * Pi / n*i), p[pn].py + R*sin(2 * Pi / n*i));
            }
            glEnd(); 
            break;
        default:
            break;
        }
        
        //glLoadIdentity();
        glFlush();
    }
    else if (id == 5)                            //Rotate
    {
        //glTranslatef(100, 0, 0.0);
        glRotatef(60, 0, 0, 1.0);                //旋转60°
        //glTranslatef(-100, 0, 0.0);
        glColor3f(0.0, 1.0, 0.0);
        
        switch (DrawType)
        {
        case 0:
            glBegin(GL_LINES);
            for (int i = 1; i <= pn; i++)
            {
                glVertex2i(p[i].px, p[i].py);
            }
            glEnd();
            break;
        case 1:
            glBegin(GL_POLYGON);
            for (int i = 1; i <= pn; i++)
            {
                glVertex2i(p[i].px, p[i].py);
            }
            glEnd();
            break;
        case 2:
            glBegin(GL_POLYGON);
            for (int i = 0; i < n; ++i)
            {
                glVertex2f(p[pn].px + R*cos(2 * Pi / n*i), p[pn].py + R*sin(2 * Pi / n*i));
            }
            glEnd();
            break;
        default:
            break;
        }

        //glLoadIdentity();
        glFlush();
    }
    else if (id == 6)                                //Size
    {
        //glTranslatef(-100, -50, 0.0);
        glScalef(2, 2, 1.0);                        //x axis, y axis
        //glTranslatef(100, 50, 0.0);
        glColor3f(0.0, 1.0, 0.0);
        
        switch (DrawType)
        {
        case 0:
            glBegin(GL_LINES);
            for (int i = 1; i <= pn; i++)
            {
                glVertex2i(p[i].px, p[i].py);
            }
            glEnd();
            break;
        case 1:
            glBegin(GL_LINE_LOOP);
            for (int i = 1; i <= pn; i++)
            {
                glVertex2i(p[i].px, p[i].py);
            }
            glEnd();
            break;
        case 2:
            glBegin(GL_LINE_LOOP);
            for (int i = 0; i < n; ++i)
            {
                glVertex2f(p[pn].px + R*cos(2 * Pi / n*i), p[pn].py + R*sin(2 * Pi / n*i));
            }
            glEnd();
            break;
        default:
            break;
        }

        //glLoadIdentity();
        glFlush();
    }
}

这周的软件工程课着重讲解了程序代码的格式以及注释的重要性。所以我在写程序的时候注意了一下。当然肯定没有要求的那么标准，只是简单地将程序分了“块”，核心“块”前面加上必要的注释。然后在每个函数之前都有注释说明函数内容。只是还没达到非常正规的要求。未能加入函数的参数以及返回值的具体作用。即使只加入了这么一点代码，就会使整体看着十分舒服。时隔数天再读代码都会觉得思路清晰。以前改格式只是为了看着好看，并没有注意到内在的东西，比如即使是一个函数中的一段代码，在逻辑上也是有层次的，分“块”的意义就在此，将这些内在的逻辑清楚明白地展现出来，既美观整洁，又有利于团队合作。