int CLCDStreamingText::AddText(LPCTSTR szText)
{
CLCDText* pText = new CLCDText;
pText->Initialize();
pText->SetText(szText);
pText->SetOrigin(GetOrigin().x, GetOrigin().y);
pText->SetLogicalOrigin(GetLogicalOrigin().x, GetLogicalOrigin().y);
pText->SetSize(GetWidth(), GetHeight());
pText->SetBackgroundMode(OPAQUE);
LOGFONT lf;
GetObject(m_hFont, sizeof(LOGFONT), &lf);
pText->SetFont(lf);
m_bRecalcExtent = TRUE;
m_Objects.push_back(pText);
if (NULL == m_pQueueHead)
{
m_pQueueHead = pText;
}
// return the zero-based index
return (int)(m_Objects.size()-1);
}
void CLCDScrollingText::OnDraw(CLCDGfxBase &rGfx)
{
if (!m_nTextLength)
{
return;
}
// calculate the scrolling distance
if (-1 == m_nScrollingDistance)
{
CLCDText::OnDraw(rGfx);
if (SCROLL_VERT == m_eScrollDir)
{
// determine how far we have to travel until scrolling stops
m_nScrollingDistance = ((GetHeight()) >= GetVExtent().cy) ?
0 : (GetVExtent().cy - GetHeight());
SetLogicalSize(GetVExtent().cx, GetVExtent().cy);
}
else
{
// determine how far we have to travel until scrolling stops
m_nScrollingDistance = ((GetWidth()) >= GetHExtent().cx) ?
0 : (GetHExtent().cx - GetWidth());
SetLogicalSize(max(GetSize().cx, GetHExtent().cx), GetHExtent().cy);
}
}
switch(m_eState)
{
case STATE_START_DELAY:
if (m_dwEllapsedTime > m_dwStartDelay)
{
m_eState = STATE_SCROLL;
m_dwEllapsedTime = 0;
m_dwLastUpdate = GetTickCount();
}
break;
case STATE_END_DELAY:
if (m_dwEllapsedTime > m_dwEndDelay)
{
if (m_bRepeat)
{
ResetUpdate();
break;
}
m_dwEllapsedTime = 0;
m_dwLastUpdate = GetTickCount();
m_eState = STATE_DONE;
}
break;
case STATE_SCROLL:
{
// TODO: add some anti-aliasing on the movement
// how much time has ellapsed?
// given the speed, what is the total displacement?
float fDistance = (float)(m_dwSpeed * m_dwEllapsedTime) / 1000.0f;
m_fTotalDistance += fDistance;
// we dont want the total distnace exceed our scrolling distance
int nTotalOffset = min((int)m_fTotalDistance, m_nScrollingDistance);
if (SCROLL_VERT == m_eScrollDir)
{
SetLogicalOrigin(GetLogicalOrigin().x, -1 * nTotalOffset);
}
else
{
SetLogicalOrigin(-1 * nTotalOffset, GetLogicalOrigin().y);
}
m_dwLastUpdate = GetTickCount();
if (nTotalOffset == m_nScrollingDistance)
{
m_eState = STATE_END_DELAY;
}
}
break;
case STATE_DONE:
break;
default:
break;
}
CLCDText::OnDraw(rGfx);
}
