/*
*
* ChartScrollBar.h
*
* Written by C�dric Moonen (cedric_moonen@hotmail.com)
*
*
*
* This code may be used for any non-commercial and commercial purposes in a compiled form.
* The code may be redistributed as long as it remains unmodified and providing that the
* author name and this disclaimer remain intact. The sources can be modified WITH the author
* consent only.
*
* This code is provided without any garanties. I cannot be held responsible for the damage or
* the loss of time it causes. Use it at your own risks
*
* An e-mail to notify me that you are using this code is appreciated also.
*
*
*/
#include "stdafx.h"
#include "ChartScrollBar.h"
#include "ChartAxis.h"
#include "ChartCtrl.h"
#include "math.h"
CChartScrollBar::CChartScrollBar(CChartAxis* pParentAxis)
: CScrollBar(), m_pParentAxis(pParentAxis)
{
}
CChartScrollBar::~CChartScrollBar()
{
}
void CChartScrollBar::CreateScrollBar(const CRect& PlottingRect)
{
CRect Temp = PlottingRect;
Temp.top++; Temp.left++;
DWORD dwStyle = SBS_HORZ | WS_CHILD;
if (m_pParentAxis->IsHorizontal())
{
if (m_pParentAxis->m_bIsSecondary)
dwStyle |= SBS_TOPALIGN;
else
dwStyle += SBS_BOTTOMALIGN;
}
else
{
if (m_pParentAxis->m_bIsSecondary)
dwStyle |= SBS_VERT | SBS_RIGHTALIGN;
else
dwStyle += SBS_VERT | SBS_LEFTALIGN;
}
CScrollBar::Create(dwStyle, Temp, m_pParentAxis->m_pParent,100);
SCROLLINFO info;
info.cbSize = sizeof(SCROLLINFO);
info.fMask = SIF_ALL;
info.nMin = 1;
info.nMax = 1;
info.nPage = 1;
info.nPos = 1;
CScrollBar::SetScrollInfo(&info);
}
bool CChartScrollBar::IsScrollInverted() const
{
bool bInverted = false;
if (m_pParentAxis->IsInverted() && m_pParentAxis->m_bIsHorizontal)
bInverted = true;
if (!m_pParentAxis->IsInverted() && !m_pParentAxis->m_bIsHorizontal)
bInverted = true;
return bInverted;
}
void CChartScrollBar::Refresh()
{
double AxisMin=0, AxisMax=0;
double SeriesMin=0, SeriesMax=0;
m_pParentAxis->GetMinMax(AxisMin,AxisMax);
m_pParentAxis->GetSeriesMinMax(SeriesMin,SeriesMax);
double dStep = 0;
int iTotalSteps = 0;
int iCurrentStep = 0;
if (m_pParentAxis->IsLogarithmic())
{
// TODO: do something if the series has 0 in it
dStep = pow(AxisMax/AxisMin,0.1);
iTotalSteps = (int)ceil(log(SeriesMax/SeriesMin)/log(dStep));
iCurrentStep = (int)(log(AxisMin/SeriesMin)/log(dStep));
}
else
{
dStep = (AxisMax - AxisMin) / 10.0;
iTotalSteps = (int)ceil((SeriesMax - SeriesMin)/dStep);
iCurrentStep = (int)(iTotalSteps * ((AxisMin - SeriesMin)/(SeriesMax-SeriesMin)));
}
SCROLLINFO info;
info.cbSize = sizeof(SCROLLINFO);
info.fMask = SIF_ALL;
if ( (AxisMax-AxisMin) == 0 || (SeriesMax-SeriesMin)==0 )
{
info.nMin = 1;
info.nMax = 1;
info.nPage = 1;
info.nPos = 1;
}
else
{
info.nMin = 1;
info.nMax = iTotalSteps;
info.nPage = 10;
info.nPos = iCurrentStep;
if (IsScrollInverted())
info.nPos = iTotalSteps - 9 - iCurrentStep;
else
info.nPos = iCurrentStep;
}
CScrollBar::SetScrollInfo(&info);
}
void CChartScrollBar::OnHScroll(UINT nSBCode, UINT nPos)
{
int MinPos;
int MaxPos;
int PreviousPos = CScrollBar::GetScrollPos();
CScrollBar::GetScrollRange(&MinPos, &MaxPos);
int CurPos = PreviousPos;
bool bUpdate = true;
switch (nSBCode)
{
case SB_LEFT:
CurPos = 0;
break;
case SB_RIGHT:
CurPos = MaxPos;
break;
case SB_ENDSCROLL:
bUpdate = false;
break;
case SB_LINELEFT:
if (CurPos > MinPos)
CurPos--;
break;
case SB_LINERIGHT:
if (CurPos < MaxPos-9)
CurPos++;
break;
case SB_PAGELEFT:
if (CurPos > MinPos)
CurPos = max(MinPos, CurPos - 10);
break;
case SB_PAGERIGHT:
if (CurPos < MaxPos-9)
CurPos = min(MaxPos, CurPos + 10);
break;
case SB_THUMBPOSITION:
CurPos = nPos;
break;
case SB_THUMBTRACK:
CurPos = nPos;
break;
}
if (bUpdate)
{
// Set the new position of the thumb (scroll box).
CScrollBar::SetScrollPos(CurPos);
MoveAxisToPos(PreviousPos,CurPos);
}
}
void CChartScrollBar::OnVScroll(UINT nSBCode, UINT nPos)
{
int MinPos;
int MaxPos;
int PreviousPos = CScrollBar::GetScrollPos();
CScrollBar::GetScrollRange(&MinPos, &MaxPos);
int CurPos = PreviousPos;
bool bUpdate = true;
switch (nSBCode)
{
case SB_BOTTOM:
CurPos = MaxPos;
break;
case SB_TOP:
CurPos = 0;
break;
case SB_ENDSCROLL:
bUpdate = false;
break;
case SB_LINEDOWN:
if (CurPos < MaxPos-9)
CurPos++;
break;
case SB_LINEUP:
if (CurPos > MinPos)
CurPos--;
break;
case SB_PAGEUP:
if (CurPos > MinPos)
CurPos = max(MinPos, CurPos - 10);
break;
case SB_PAGEDOWN:
if (CurPos < MaxPos-9)
CurPos = min(MaxPos, CurPos + 10);
break;
case SB_THUMBPOSITION:
CurPos = nPos;
break;
case SB_THUMBTRACK:
CurPos = nPos;
break;
}
if (bUpdate)
{
// Set the new position of the thumb (scroll box).
CScrollBar::SetScrollPos(CurPos);
MoveAxisToPos(PreviousPos,CurPos);
}
}
void CChartScrollBar::MoveAxisToPos(int PreviousPos, int CurPos)
{
double AxisMin=0, AxisMax=0;
double SeriesMin=0, SeriesMax=0;
m_pParentAxis->GetMinMax(AxisMin,AxisMax);
m_pParentAxis->GetSeriesMinMax(SeriesMin,SeriesMax);
if (m_pParentAxis->IsLogarithmic())
{
double dStep = pow(AxisMax/AxisMin,0.1);
double dFactor = pow(dStep,(CurPos - PreviousPos));
if (IsScrollInverted())
m_pParentAxis->SetZoomMinMax(AxisMin/dFactor,AxisMax/dFactor);
else
m_pParentAxis->SetZoomMinMax(AxisMin*dFactor,AxisMax*dFactor);
}
else
{
double dStep = (AxisMax - AxisMin) / 10.0;
double dOffset = (CurPos - PreviousPos) * dStep;
if (IsScrollInverted())
m_pParentAxis->SetZoomMinMax(AxisMin-dOffset,AxisMax-dOffset);
else
m_pParentAxis->SetZoomMinMax(AxisMin+dOffset,AxisMax+dOffset);
}
}