A Simple Digital LCD Demo

// DigitalLCDClass.cpp: implementation of the DigitalLCDClass class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "DigitalLCDClass.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

DigitalLCDClass::DigitalLCDClass()
{
	m_nXPos=m_nYPos=0;
	m_nItem=10;
	col=RGB(255,0,0);
}

DigitalLCDClass::~DigitalLCDClass()
{
	if(msg)
		free(msg);
}

void DigitalLCDClass::DrawDigit(HDC hdc, int digit,int iPos=0,COLORREF col=0)
{
			RECT rt;
			int offset=35;
			HBRUSH hBrush;
			hBrush=::CreateSolidBrush (col);

			if(digit==2 || digit==3||digit==5||digit==0||digit==6||digit==7||digit==8||digit==9)
			{
			rt.left =m_nXPos+10+iPos*offset;rt.right =m_nXPos+32+iPos*offset;
			rt.top =m_nYPos+10;rt.bottom =m_nYPos+12;

			::FillRect (hdc,&rt,hBrush);
			rt.left =m_nXPos+11+iPos*offset;rt.right =m_nXPos+31+iPos*offset;
			rt.top =m_nYPos+11;rt.bottom =m_nYPos+13;
			::FillRect (hdc,&rt,hBrush);//Top 
			}

			if(digit==2 || digit==3||digit==4||digit==5||digit==6||digit==8||digit==9)			
			{
			rt.left =m_nXPos+10+iPos*offset;rt.right =m_nXPos+32+iPos*offset;
			rt.top =m_nYPos+32;rt.bottom =m_nYPos+33;
			::FillRect (hdc,&rt,hBrush);
			rt.left =m_nXPos+11+iPos*offset;rt.right =m_nXPos+31+iPos*offset;
			rt.top =m_nYPos+31;rt.bottom =m_nYPos+34;
			::FillRect (hdc,&rt,hBrush);//middle
			}

			if(digit==2 || digit==3||digit==5||digit==0||digit==6||digit==8||digit==9)
			{
			rt.left =m_nXPos+10+iPos*offset;rt.right =m_nXPos+32+iPos*offset;
			rt.top =m_nYPos+54;rt.bottom =m_nYPos+56;
			::FillRect (hdc,&rt,hBrush);
			rt.left =m_nXPos+11+iPos*offset;rt.right =m_nXPos+31+iPos*offset;
			rt.top =m_nYPos+53;rt.bottom =m_nYPos+54;
			::FillRect (hdc,&rt,hBrush);//botton
			}

			if(digit==4||digit==5||digit==0||digit==6||digit==8||digit==9)
			{
			rt.left =m_nXPos+9+iPos*offset;rt.right =m_nXPos+10+iPos*offset;
			rt.top =m_nYPos+12;rt.bottom =m_nYPos+32;
			::FillRect (hdc,&rt,hBrush);
			rt.left =m_nXPos+8+iPos*offset;rt.right =m_nXPos+11+iPos*offset;
			rt.top =m_nYPos+13;rt.bottom =m_nYPos+31;
			::FillRect (hdc,&rt,hBrush);//top left
			}

			if(digit==1||digit==2 || digit==3||digit==4||digit==0||digit==7||digit==8||digit==9)
			{
			rt.left =m_nXPos+9+23+iPos*offset;rt.right =m_nXPos+10+23+iPos*offset;
			rt.top =m_nYPos+12;rt.bottom =m_nYPos+32;
			::FillRect (hdc,&rt,hBrush);
			rt.left =m_nXPos+8+23+iPos*offset;rt.right =m_nXPos+11+23+iPos*offset;
			rt.top =m_nYPos+13;rt.bottom =m_nYPos+31;
			::FillRect (hdc,&rt,hBrush);//top right			
			}

			if(digit==2||digit==0||digit==6||digit==8)
			{
			rt.left =m_nXPos+9+iPos*offset;rt.right =m_nXPos+10+iPos*offset;
			rt.top =m_nYPos+12+22;rt.bottom =m_nYPos+32+22;
			::FillRect (hdc,&rt,hBrush);
			rt.left =m_nXPos+8+iPos*offset;rt.right =m_nXPos+11+iPos*offset;
			rt.top =m_nYPos+13+22;rt.bottom =m_nYPos+31+22;
			::FillRect (hdc,&rt,hBrush);//bottom left
			}
			if(digit==1|| digit==3||digit==4||digit==5||digit==0||digit==6||digit==7||digit==8||digit==9)
			{
			rt.left =m_nXPos+9+23+iPos*offset;rt.right =m_nXPos+10+23+iPos*offset;
			rt.top =m_nYPos+12+22;rt.bottom =m_nYPos+32+22;
			::FillRect (hdc,&rt,hBrush);
			rt.left =m_nXPos+8+23+iPos*offset;rt.right =m_nXPos+11+23+iPos*offset;
			rt.top =m_nYPos+13+22;rt.bottom =m_nYPos+31+22;
			::FillRect (hdc,&rt,hBrush);//bottom right
			}
			
			DeleteObject(hBrush);

}

void DigitalLCDClass::Display(HDC hdc, char *cData)
{
		RECT rt;
		int nLength=(int)::strlen (cData);
		
		if(nLength>m_nItem) nLength=m_nItem;

		rt.left =m_nXPos+6;rt.right =m_nXPos+32+(m_nItem-1)*35+4;
		rt.top =m_nYPos+8;rt.bottom =m_nYPos+58;
		FillRect(hdc,&rt,(HBRUSH)GetStockObject(4));
		
		for(int i=0;i<m_nItem;i++)
			{
			DrawDigit(hdc,8,i,RGB(55,55,55));
			}
		for(i=nLength-1;i>=0;i--)
		DrawDigit(hdc,cData[i]-'0',(m_nItem-nLength)+i,col);
}

BOOL DigitalLCDClass::SetItem(int iItem)
{
	if(iItem<80)
		m_nItem=iItem;
	else
		return false;

	return true;
}

BOOL DigitalLCDClass::SetPos(int xPos, int yPos)
{
	m_nXPos=xPos;
	m_nYPos=yPos;
	return true;
}

BOOL DigitalLCDClass::SetColor(COLORREF rgb)
{
	col=rgb;
return true;
}

BOOL DigitalLCDClass::Init()
{
	msg=(char*)malloc(80);
	if(!msg) return false;
	memset(msg,'\0',80);
	return true;
}

void DigitalLCDClass::UpdateData(HDC hdc)
{
	if(msg)
	Display(hdc,msg);
}

BOOL DigitalLCDClass::SetText(char *cMsg)
{
	if(msg)
		memcpy(msg,cMsg,strlen(cMsg));
		return false;
	return false;
}

void DigitalLCDClass::Clear()
{
	if(msg)
		memset(msg,0,strlen(msg));
}