| private Ortho ( double left, double right, double bottom, double top, double zNear, double zFar ) : void | ||
| left | double | |
| right | double | |
| bottom | double | |
| top | double | |
| zNear | double | |
| zFar | double | |
| return | void | |
/// <summary>
/// 实施传统方式的投影
/// </summary>
/// <param name="camera"></param>
public static void LegacyGLProjection(this ICamera camera)
{
// Load the projection identity matrix.
OpenGL.MatrixMode(OpenGL.GL_PROJECTION);
OpenGL.LoadIdentity();
// Perform the projection.
switch (camera.CameraType)
{
case CameraType.Perspecitive:
IPerspectiveCamera perspectiveCamera = camera;
OpenGL.gluPerspective(perspectiveCamera.FieldOfView, perspectiveCamera.AspectRatio, perspectiveCamera.Near, perspectiveCamera.Far);
break;
case CameraType.Ortho:
IOrthoCamera orthoCamera = camera;
OpenGL.Ortho(orthoCamera.Left, orthoCamera.Right, orthoCamera.Bottom, orthoCamera.Top, orthoCamera.Near, orthoCamera.Far);
break;
default:
break;
}
// Perform the look at transformation.
OpenGL.gluLookAt((double)camera.Position.x, (double)camera.Position.y, (double)camera.Position.z,
(double)camera.Target.x, (double)camera.Target.y, (double)camera.Target.z,
(double)camera.UpVector.x, (double)camera.UpVector.y, (double)camera.UpVector.z);
// Back to the modelview matrix.
OpenGL.MatrixMode(OpenGL.GL_MODELVIEW);
}
/// <summary>
/// Draws the text.
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="color"></param>
/// <param name="faceName"></param>
/// <param name="fontSize"></param>
/// <param name="text"></param>
public static void DrawText(int x, int y, Color color, string faceName, float fontSize, string text)
{
IntPtr renderContext = Win32.wglGetCurrentContext();
IntPtr deviceContext = Win32.wglGetCurrentDC();
// Get the font size in pixels.
var fontHeight = (int)(fontSize * (16.0f / 12.0f));
// Do we have a font bitmap entry for this OpenGL instance and face name?
var result = (from fbe in fontBitmapEntries
where fbe.HDC == deviceContext &&
fbe.HRC == renderContext &&
String.Compare(fbe.FaceName, faceName, StringComparison.OrdinalIgnoreCase) == 0 &&
fbe.Height == fontHeight
select fbe).ToList();
// Get the FBE or null.
var fontBitmapEntry = result.FirstOrDefault();
// If we don't have the FBE, we must create it.
if (fontBitmapEntry == null)
{
fontBitmapEntry = CreateFontBitmapEntry(faceName, fontHeight);
}
int[] viewport = OpenGL.GetViewport();
double width = viewport[2];
double height = viewport[3];
// Create the appropriate projection matrix.
OpenGL.MatrixMode(OpenGL.GL_PROJECTION);
OpenGL.PushMatrix();
OpenGL.LoadIdentity();
OpenGL.Ortho(0, width, 0, height, -1, 1);
// Create the appropriate modelview matrix.
OpenGL.MatrixMode(OpenGL.GL_MODELVIEW);
OpenGL.PushMatrix();
OpenGL.LoadIdentity();
//GL.Color(color.R, color.G, color.B);
//GL.RasterPos2i(x, y);
//GL.PushAttrib(GL.GL_LIST_BIT | GL.GL_CURRENT_BIT |
// GL.GL_ENABLE_BIT | GL.GL_TRANSFORM_BIT);
OpenGL.Color3ub(color.R, color.G, color.B);
//GL.Disable(GL.GL_LIGHTING);
//GL.Disable(GL.GL_TEXTURE_2D);
//GL.Disable(GL.GL_DEPTH_TEST);
OpenGL.RasterPos2i(x, y);
// Set the list base.
OpenGL.ListBase(fontBitmapEntry.ListBase);
// Create an array of lists for the glyphs.
var lists = text.Select(c => (byte)c).ToArray();
// Call the lists for the string.
OpenGL.CallLists(lists.Length, OpenGL.GL_UNSIGNED_BYTE, lists);
OpenGL.Flush();
//// Reset the list bit.
//GL.PopAttrib();
// Pop the modelview.
OpenGL.PopMatrix();
// back to the projection and pop it, then back to the model view.
OpenGL.MatrixMode(OpenGL.GL_PROJECTION);
OpenGL.PopMatrix();
OpenGL.MatrixMode(OpenGL.GL_MODELVIEW);
}
