void CNavigationWnd::LoadTexture(CString strFileName)
{
HBITMAP hBmp = (HBITMAP) ::LoadImage (NULL,
(LPCTSTR) strFileName, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE |
LR_CREATEDIBSECTION);
::GetObject (hBmp, sizeof (m_bmTexture), &m_bmTexture);
//Generate one texture index.
glGenTextures(1, &m_texName);
//Tell OpenGL we will be working with that texture number.
glBindTexture(GL_TEXTURE_2D, m_texName);
//Set the parameters for the texture.
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
// Build the texture map
// Could use glTexImage2D instead but then we would have to scale
// the image to make it a power of 2.
gluBuild2DMipmaps( GL_TEXTURE_2D, 3, m_bmTexture.bmWidth, m_bmTexture.bmHeight,
GL_BGR_EXT, GL_UNSIGNED_BYTE, m_bmTexture.bmBits );
glBindTexture(GL_TEXTURE_2D, 0);
::glDeleteLists(1,1);
BuildList();
InvalidateRect(NULL);
}
void CNavigationWnd::BuildList()
{
::glNewList(1,GL_COMPILE_AND_EXECUTE);
// ---------------------------------------------------------
//glPushMatrix();
glScalef(m_fScale,m_fScale,0);
if(m_bmTexture.bmBits != NULL)
{
//glDrawPixels(m_bmTexture.bmWidth, m_bmTexture.bmHeight,GL_BGR_EXT,GL_UNSIGNED_BYTE, m_bmTexture.bmBits);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, m_texName);
glColor3f(1.0f,1.0f,1.0f);
glBegin(GL_POLYGON);
float fLeft = (float)(m_fX/m_bmTexture.bmWidth);
float fRight = (float)((m_fX + m_iClientWidth)/m_bmTexture.bmWidth);
float fTop = (float)((m_fY+ m_iClientHeight)/m_bmTexture.bmHeight);
float fBottom = (float)(m_fY/m_bmTexture.bmHeight);
//glTexCoord2f(0.0, 0.0); glVertex3f(0.0f, 0.0f, 0.0f);
glTexCoord2f(fLeft, fBottom); glVertex3f(0.0f, 0.0f, 0.0f);
//glTexCoord2f(0.0, 1.0); glVertex3f(0.0f, m_iClientHeight, 0.0f);
glTexCoord2f(fLeft, fTop); glVertex3f(0.0f, m_iClientHeight, 0.0f);
//glTexCoord2f(1.0, 1.0); glVertex3f(m_iClientWidth, m_iClientHeight, 0.0f);
glTexCoord2f(fRight, fTop); glVertex3f(m_iClientWidth, m_iClientHeight, 0.0f);
//glTexCoord2f(1.0, 0.0); glVertex3f(m_iClientWidth, 0.0f, 0.0f);
glTexCoord2f(fRight, fBottom); glVertex3f(m_iClientWidth, 0.0f, 0.0f);
glEnd();
glDisable(GL_TEXTURE_2D);
}
//glPopMatrix();
glColor3f(1.0f,0.0f,0.0f);
// OpenGL no' nguoc doi, ham glTranslatef la ham move lai vi tri cu sau khi quay
// Ham gltranslatef la ham move toi vi tri toa do goc roi moi qua
// Code phai doc tu dong 3, 2, 1.
// Phai noi truoc khi ve, chu ve roi thi noi gi nua.
glLoadIdentity(); // glLoadIdentity replaces the current matrix with the identity matrix
glTranslatef(150.0f, 150.0f, 0.0f);// 1
glRotatef(m_fRotatedAngle,0.0f,0.0f,1.0f);// 2
glTranslatef(-150.0f, -150.0f, 0.0f);// 3
glBegin(GL_TRIANGLES);
glVertex3f(150.0f + m_fX, 175.0f + m_fY, 0.0f);
/*glColor3f(1.0f,0.0f,0.0f);*/
glVertex3f(200.0f + m_fX, 150.0f + m_fY, 0.0f);
//glColor3f(1.0f,0.0f,0.0f);
glVertex3f(150.0f + m_fX, 150.0f + m_fY, 0.0f);
glEnd();
// -----------------------------------------------------------
::glEndList();
}
m_fX and m_fY is the new position of small area that took from original picture
