public void ResetView(int w, int h)
{
if (w != 0 || h != 0)
{
m_iScreenWidth = w;
m_iScreenHeight = h;
}
// calculate the aspect ratio of the screen
if (m_iScreenHeight == 0)
{
m_fAspect = m_iScreenWidth;
}
else
{
m_fAspect = m_iScreenWidth / m_iScreenHeight;
}
// Calculate the clipping volume along the y-axis, then set our
// right, left, top and bottom clipping volumn
double viewDepth = GetFocalLength();
double clipY = Math.Tan(Utils.Radiansf(m_fFovY / 2)) * viewDepth;
if (m_iScreenWidth <= m_iScreenHeight)
{
m_fLeft = -clipY;
m_fRight = clipY;
m_fBottom = -clipY * m_iScreenHeight / m_iScreenWidth;
m_fTop = clipY * m_iScreenHeight / m_iScreenWidth;
}
else
{
m_fLeft = -clipY * m_iScreenWidth / m_iScreenHeight;
m_fRight = clipY * m_iScreenWidth / m_iScreenHeight;
m_fBottom = -clipY;
m_fTop = clipY;
}
// Set Viewport to window dimensions
OpenGLControl.glViewport(0, 0, m_iScreenWidth, m_iScreenHeight);
// Reset the projection matrix (coordinate system)
OpenGLControl.glMatrixMode(OpenGLControl.GL_PROJECTION);
OpenGLControl.glLoadIdentity();
if (m_bPerspective)
{
// Perspective transformations.
OpenGLControl.gluPerspective(m_fFovY, m_fAspect, m_fNear, m_fFar);
}
else
{
// Orthographic transformations.
OpenGLControl.glOrtho(m_fLeft, m_fRight, m_fBottom, m_fTop, m_fNear, m_fFar);
}
// Save the Projection matrix. This is used later for
// conversion of mouse coordinates to world coordinates.
OpenGLControl.glGetDoublev(OpenGLControl.GL_PROJECTION_MATRIX, m_dProjectionMatrix);
// Save the Projection matrix. This is used later for
// conversion of mouse coordinates to world coordinates.
OpenGLControl.glGetIntegerv(OpenGLControl.GL_VIEWPORT, m_iViewport);
// Reset the ModelView matrix
OpenGLControl.glMatrixMode(OpenGLControl.GL_MODELVIEW);
OpenGLControl.glLoadIdentity();
}