SharpGL(Opengl)入門之紋理星球

文章目錄

• 1 初始化材質、光照、紋理和星球
• 2 繪製星球
• 3 通過OpenFileDialog替換紋理
• 4 通過拖拽替換紋理

SharpGL(Opengl)入門之紋理星球

PS：SharpGL是C#對Opengl的封裝，不瞭解SharpGL的同學可以去www.codeproject.com搜尋SharpGL。

做個小例子，能夠載入各種圖片到球形的星球上顯示，星球自動旋轉，可用WSAD和滑鼠控制視角，用QE控制上下，文末附原始碼和release程式。

A picture paints a thousand sentences.

PS：旋轉的地球GIF在這裡：http://images.cnblogs.com/cnblogs_com/bitzhuwei/482613/o_earth.gif

旋轉的月球GIF在這裡：http://images.cnblogs.com/cnblogs_com/bitzhuwei/482613/o_moon.gif

1 初始化材質、光照、紋理和星球

private void openGLControl_OpenGLInitialized(object sender, EventArgs e)        {            OpenGL gl = openGLControl.OpenGL;            gl.ClearColor(0, 0, 0, 0);            gl.ShadeModel(OpenGL.GL_SMOOTH);            //初始化材質            var mat_specular = new float[] { 1.0f, 1.0f, 1.0f, 1.0f };            var mat_ambient = new float[] { 1.0f, 1.0f, 1.0f, 1.0f };            var mat_diffuse = new float[] { 2.0f, 2.0f, 2.0f, 0.1f };            var mat_shininess = new float[] { 100.0f };            gl.Material(OpenGL.GL_FRONT, OpenGL.GL_SPECULAR, mat_specular);            gl.Material(OpenGL.GL_FRONT, OpenGL.GL_AMBIENT, mat_ambient);            gl.Material(OpenGL.GL_FRONT, OpenGL.GL_DIFFUSE, mat_diffuse);            gl.Material(OpenGL.GL_FRONT, OpenGL.GL_SHININESS, mat_shininess);            //初始化光照            var ambientLight = new float[] { 1.0f, 1.0f, 1.0f, 1.0f };            var diffuseLight = new float[] { 1.0f, 1.0f, 1.0f, 1.0f };                var posLight0 = new float[] { 2.0f, 0.1f, 0.0f, 0.0f };            gl.Light(OpenGL.GL_LIGHT0, OpenGL.GL_AMBIENT, ambientLight);            gl.Light(OpenGL.GL_LIGHT0, OpenGL.GL_DIFFUSE, diffuseLight);             gl.Light(OpenGL.GL_LIGHT0, OpenGL.GL_POSITION, posLight0);            //初始化紋理            texture = new SharpGL.SceneGraph.Assets.Texture();            texture.Create(gl, "Data/earth.bmp");            //初始化星球            ptrBall = gl.NewQuadric();                                gl.QuadricNormals(ptrBall, OpenGL.GL_SMOOTH);            gl.QuadricTexture(ptrBall, (int)(OpenGL.GL_TRUE));            gl.Enable(OpenGL.GL_TEXTURE_2D);            gl.Enable(OpenGL.GL_LIGHTING);            gl.Enable(OpenGL.GL_LIGHT0);            gl.Enable(OpenGL.GL_LIGHT1);            gl.Enable(OpenGL.GL_DEPTH_TEST);        }

2 繪製星球

private void openGLControl_OpenGLDraw(object sender, PaintEventArgs e)        {            if (this.texture != null)            {                OpenGL gl = openGLControl.OpenGL;                gl.Clear(OpenGL.GL_COLOR_BUFFER_BIT | OpenGL.GL_DEPTH_BUFFER_BIT);                                gl.LoadIdentity();                gl.Scale(3.6, 3.6, 3.6);//放大到3.6倍                gl.Rotate(90, 1.0f, 0, 0);//繞X軸旋轉90度                gl.Rotate(-rotation, 0.0f, 0.0f, 1.0f);//饒Z軸旋轉                gl.Sphere(ptrBall, 1.0f, 100, 100);//繪製星球                rotation += 3.0f;            }        }

3 通過OpenFileDialog替換紋理

private void lblTextureImage_Click(object sender, EventArgs e)        {            if (openTextureImage.ShowDialog()== System.Windows.Forms.DialogResult.OK)            {                UpdateTextureImage(openTextureImage.FileName);            }        }        private void UpdateTextureImage(string filename)        {            var gl = this.openGLControl.OpenGL;            if (this.texture != null)            {                this.texture.Destroy(gl);                this.texture.Create(gl, filename);                this.lblTextureImage.Text = (new FileInfo(filename)).Name;            }        }

4 通過拖拽替換紋理4.1 屬性設定

將OpenGLControl的AllowDrop屬性設定為True。

4.2 事件代碼

為OpenGLControl添加DragEnter和DragDrop事件。

代碼如下。

private void openGLControl_DragEnter(object sender, DragEventArgs e)        {            if (e.Data.GetDataPresent(DataFormats.FileDrop))            {                e.Effect = DragDropEffects.All;            }            else            {                e.Effect = DragDropEffects.None;            }        }        private void openGLControl_DragDrop(object sender, DragEventArgs e)        {            if (e.Data.GetDataPresent(DataFormats.FileDrop))            {                var item = (string[])e.Data.GetData(DataFormats.FileDrop);                UpdateTextureImage(item[0]);            }        }

Enjoy！

完整原始碼在此：bitzhuwei.SolarSystem.TexturedEarth.zip

release版程式在此：紋理星球-release.zip