private void Render()
{
//初始化屏幕
//1.清理屏幕
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
GL.ClearColor(0, 0, 0, 0); //背景为黑
//2.设置矩阵模式：GL_Projection或者GL_Modelview
GL.MatrixMode(MatrixMode.Modelview); //指定当前矩阵模型视图矩阵
//3.加载当前矩阵模式
GL.LoadIdentity(); //将当前矩阵转为单位矩阵
if (glControl1.Focused)
{
GL.Color3(Color.Yellow);
}
else
{
GL.Color3(Color.SeaGreen);
}
//视口设置
//4.视口设置
Matrix4 lookat = Matrix4.LookAt(-Eye_distance, -Eye_distance,
Eye_distance, 0, 0, 0, 0, 0, 1);
GL.LoadMatrix(ref lookat);//加载视口矩阵
//GL.Rotate(angle.X, 1, 0, 0);//旋转物体
//GL.Rotate(angle.Y, 0, 0, 1);
_ArcBall.TransformMatrix();//更新轨迹球
//显示设置
//5.显示设置
//绘图
if (hasAxis)
{
DrawAxis();//画坐标轴
}
if (hasElem)
{
//循环显示每个线单元
foreach (KeyValuePair <int, Element> elem in CurModel.elements)
{
if (elem.Value.TYPE != ElemType.BEAM)
{
continue;
}
FrameElement bm = elem.Value as FrameElement;
Point3d pt1 = CurModel.nodes[bm.I].Location;
Point3d pt2 = CurModel.nodes[bm.J].Location;
//显示单元
DrawElem((float)pt1.X, (float)pt1.Y, (float)pt1.Z,
(float)pt2.X, (float)pt2.Y, (float)pt2.Z);
}
}
//绘图最后：swapBuffers()
glControl1.SwapBuffers();//调换缓存
}
private void openGLControl1_OpenGLDraw(object sender, RenderEventArgs args)
{
var gl = openGLControl1.OpenGL;
gl.ClearColor(0.2f, 0.4f, 0.2f, 0.2f);
gl.Clear(OpenGL.GL_COLOR_BUFFER_BIT | OpenGL.GL_DEPTH_BUFFER_BIT);
gl.MatrixMode(OpenGL.GL_PROJECTION);
gl.LoadIdentity();
gl.Perspective(90, (float)openGLControl1.Width / openGLControl1.Height, 1, 1000);
gl.LookAt(vx, vy, vz, 0, 0, 0, upx, upy, upz);
ArcBall.TransformMatrix(gl);
gl.MatrixMode(OpenGL.GL_MODELVIEW);
gl.LoadIdentity();
DrawAxis(gl);
DrawPos(gl);
gl.Finish();
gl.Flush();
}