Globe中，Opengl创造的模式

一、使用list创造:

           m_billboardRectList = GL.glGenLists(1);

           GL.glNewList(m_billboardRectList, GL.GL_COMPILE);

           {可以加入任何的创造物体！！}

           GL.glEndList();

如下：

（1）创造点

private void createPoint()

        {

            m_billboardRectList = GL.glGenLists(1);

            GL.glNewList(m_billboardRectList, GL.GL_COMPILE);

            foreach (GLPoint p in m_array)

            {

                //convert the mouse coordinate into geocentric (OpenGL) coordinate system

                //draw the converted point on the surface of the globe

                GL.glPointSize(15.0f);

                GL.glColor3ub(255, 0, 0);

                GL.glBegin(GL.GL_POINTS);

                GL.glVertex3f((float)p.glX, (float)p.glY, (float)p.glZ);

                GL.glEnd();

            }

            GL.glEndList();

            m_bDrawPoint = true;

        }

（2）创造图像

private void CreateDisplayLists()

    {

        try

        {

            //打开位图文件

            System.Drawing.Bitmap bitmap = new Bitmap(@"D:/22.gif");

            if (null == bitmap) throw new Exception("Error initializing bitmap");

            //创建贴图

            uint texId = OpenGLTool.CreateTexture(bitmap);

            if (0 == texId) throw new Exception("Error generating texture");

            //the quad size is set to 1 unit. Therefor you will have to scale it

            //each time before drawing.

            m_billboardRectList = GL.glGenLists(1);

            GL.glNewList(m_billboardRectList, GL.GL_COMPILE);

             GL.glPushMatrix();

            GL.glAlphaFunc(GL.GL_GREATER, 0.5f);

            //向左1/2单位的平移,使位置剧中

            GL.glTranslatef(-0.5f, 0.0f, 0.0f);

            //设置openGL标志

            GL.glDisable(GL.GL_LIGHTING);

            GL.glEnable(GL.GL_BLEND);

            GL.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA);

            GL.glDepthFunc(GL.GL_LEQUAL);

            //绑定贴图

            GL.glEnable(GL.GL_TEXTURE_2D);

            GL.glBindTexture(GL.GL_TEXTURE_2D, texId);

            //create the geometry (quad) and specify the texture coordinates

            GL.glBegin(GL.GL_QUADS);

            GL.glTexCoord2f(0.0f, 0.0f); GL.glVertex3f(0.0f, 0.0f, 0.0f);

            GL.glTexCoord2f(0.0f, 1.0f); GL.glVertex3f(0.0f, 1.0f, 0.0f);

            GL.glTexCoord2f(1.0f, 1.0f); GL.glVertex3f(1.0f, 1.0f, 0.0f);

            GL.glTexCoord2f(1.0f, 0.0f); GL.glVertex3f(1.0f, 0.0f, 0.0f);

            GL.glEnd();

            GL.glPopMatrix();

               GL.glPolygonMode(GL.GL_FRONT, GL.GL_FILL);

            //Set off the OpenGL flags

            GL.glEndList();

            m_bDisplayListCreated = true;

        }

        catch (Exception ex)

        {

            System.Diagnostics.Trace.WriteLine(ex.Message);

        }

    }

(3)创造三维物体

     public void  CreateDisplayList(IMarker3DSymbol marker3DSymbol)

        {

            m_globeDisplay.DirectOpenGLDraw = true;

            GL.glMatrixMode(GL.GL_MODELVIEW);

            IDisplay display = (IDisplay)m_globeDisplay;

            //如果在起始时候加载 使用该段代码

            double scale = 0.0000068;

            m_billboardRectList = GL.glGenLists(1);

            GL.glNewList(m_billboardRectList, GL.GL_COMPILE);

            {

               // GL.glDisable(GL.GL_COLOR_MATERIAL);

                GL.glPushMatrix();

                {

                    GL.glScaled(scale, scale, scale);

                    display.SetSymbol((ISymbol)marker3DSymbol);

                }

                GL.glPopMatrix();

            //    GL.glEnable(GL.GL_COLOR_MATERIAL);

            }

            GL.glEndList();

            m_globeDisplay.DirectOpenGLDraw = false;

          //  return intSymbolDisplayList;

        }

二、使用GL.glCallList(m_billboardRectList);将物体绘制调出

（1）点或图像

private void ShowImage()

        {

            try

            {

                //为了图片面向观众的初始矩阵

                //get OpenGL model matrix which is required in order to billboard the icons

                GL.glGetDoublev(GL.GL_MODELVIEW_MATRIX, m_modelViewMatrix);

                //populate the billboard matrix

                m_billboardMatrix[0] = m_modelViewMatrix[0];

                m_billboardMatrix[1] = m_modelViewMatrix[4];

                m_billboardMatrix[2] = m_modelViewMatrix[8];

                m_billboardMatrix[3] = 0;

                m_billboardMatrix[4] = m_modelViewMatrix[1];

                m_billboardMatrix[5] = m_modelViewMatrix[5];

                m_billboardMatrix[6] = m_modelViewMatrix[9];

                m_billboardMatrix[7] = 0;

                m_billboardMatrix[8] = m_modelViewMatrix[2];

                m_billboardMatrix[9] = m_modelViewMatrix[6];

                m_billboardMatrix[10] = m_modelViewMatrix[10];

                m_billboardMatrix[11] = 0;

                m_billboardMatrix[12] = 0;

                m_billboardMatrix[13] = 0;

                m_billboardMatrix[14] = 0;

                m_billboardMatrix[15] = 1;

                //如果是画点

                // m_bDrawPoint = true;

                if (true == m_bDrawPoint)

                {

                //draw the converted point on the surface of the globe

                    GL.glPushMatrix();

                    GL.glCallList(m_billboardRectList);

                    GL.glPopMatrix();

                }

                else

                //draw the point in the points array

                if (m_array.Count > 0)

                {

                    //for each item, we need to get the distance from the camera (in geocentric units) in order to scale it

                    double dblObsX, dblObsY, dblObsZ, dMagnitude, scale;

                    ICamera camera = m_sceneViwer.Camera;

                    camera.Observer.QueryCoords(out dblObsX, out dblObsY);

                    dblObsZ = camera.Observer.Z;

                    //draw the static points

                    foreach (GLPoint p in m_array)

                    {

                        //get the distance from the camera to the drawn item.

                        //This distance will determine whteher to draw the item as a dot or as

                        //a full icon.

                        m_vector3D.SetComponents(dblObsX - p.glX, dblObsY - p.glY, dblObsZ - p.glZ);

                        dMagnitude = m_vector3D.Magnitude;

                        scale = 0.04 * dMagnitude;

                        GL.glPushMatrix();

                        //translate to the items location

                        GL.glTranslatef((float)p.glX, (float)p.glY, (float)p.glZ);

                        //orient the icon so that it'll face the camera

                         OrientBillboard();

                        //scale the item (original size is 1 ubit)

                        GL.glScaled(scale, scale, 1.0);

                        GL.glColor4f(1.0f, 1.0f, 1.0f, 1.0f);

                        //draw the item

                        GL.glCallList(m_billboardRectList);

                        GL.glPopMatrix();

                    }

                }

            }

            catch (Exception ex)

            {

                System.Diagnostics.Trace.WriteLine(ex.Message);

            }

        }

（2）调出三维：

private void Show3DS()

        {

            // IGlobeDisplayRenderingPtr ipGlobeDisplayRend(pGlobeDisplay);

            double  dblSymbolAngle=90;

            WKSPointZ wksSymbolOrientation;

            foreach (GLPoint p in m_array)

            {

                //Translate the object into place.

                GL.glPushMatrix();

                //Get the object’s OpenGL coordinate.

                //Calculate the object’s orientation.

                CalculateSymbolOrientation(this.m_sceneViwer, p.glX, p.glY, p.glZ,

                                           out wksSymbolOrientation);

                //Translate the object into place and orient it.

                TranslateAndRotate(p.glX, p.glY, p.glZ, wksSymbolOrientation, dblSymbolAngle);

                //可以设置为标量（缩小放大，物体不变大小）.

                // double dObjScale = this.getScale(p);

               //  GL.glScaled(dObjScale, dObjScale, dObjScale);

                //Draw the object.

                GL.glCallList(m_billboardRectList);

                GL.glPopMatrix();

            }

        }

二、在OnAfterDraw中调用以上两个函数

          createPoint();

          this.ShowImage();

          //Show3DS();