3.光滑着色和平面着色

下面是OpenGLDraw的事件响应函数，相对上节主要增加了对

public void Color( double red, double green, double blue)
        SharpGL.OpenGL 的成员

的函数的应用，该函数是个重载函数，目前只用到上面提到的这个形式，即以RGB为参数进行着色。

下面是OpenGLDraw的事件响应函数：

                 private void openGLControl1_OpenGLDraw( object sender, PaintEventArgs e)
                {

                         //    Get the OpenGL object, just to clean up the code.
                        SharpGL.OpenGL gl = this.openGLControl1.OpenGL;

                        gl.Clear(OpenGL.COLOR_BUFFER_BIT | OpenGL.DEPTH_BUFFER_BIT);   // Clear The Screen And The Depth Buffer
                        gl.LoadIdentity();           // Reset The View
                        gl.Translate(-1.5f, 0.0f, -6.0f);         // Move Left And Into The Screen

                        gl.Begin(OpenGL.TRIANGLES);           // Start Drawing The Pyramid

                        gl.Color(1.0f, 0.0f, 0.0f);       // Red
                        gl.Vertex(0.0f, 1.0f, 0.0f);       // Top Of Triangle (Front)
                        gl.Color(0.0f, 1.0f, 0.0f);       // Green
                        gl.Vertex(-1.0f, -1.0f, 0.0f);       // Left Of Triangle (Front)
                        gl.Color(0.0f, 0.0f, 1.0f);       // Blue
                        gl.Vertex(1.0f, -1.0f, 0.0f);       // Right Of Triangle (Front)

                        gl.End();             // Done Drawing The Pyramid

                        gl.Translate(3f, 0.0f, 0.0f);         // Move Right And Into The Screen


                        gl.Begin(OpenGL.QUADS);           // Start Drawing The Cube

                        gl.Color(0.5f, 0.5f, 1.0f);       // Set The Color To Green
                        gl.Vertex(-1.0f, 1.0f, 0.0f);       // Top Right Of The Quad (Top)
                        gl.Vertex(1.0f, 1.0f, 0.0f);       // Top Left Of The Quad (Top)
                        gl.Vertex(1.0f, -1.0f, 0.0f);       // Bottom Left Of The Quad (Top)
                        gl.Vertex(-1.0f, -1.0f, 0.0f);       // Bottom Right Of The Quad (Top)


                        gl.End();             // Done Drawing The Q

                        gl.Flush();   
                }

显示效果如下图：

 

源代码