www.pudn.com > CurveDrawing.rar > clPlot.cpp
// clPlot.cpp : implementation file
//
#include "stdafx.h"
#include "curvedrawing.h"
#include "clPlot.h"
#include "CurveDrawingView.h"
#include "MyView.h"
#include "malloc.h"
#include
#include
#include
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// clPlot
clPlot::clPlot()
{
m_ctlBkColor= RGB(255,255,255);
// m_ctlBkColor=RGB(255,0,0);
m_gridColor = RGB(127,127,127);
m_lNoValues=0;
m_lend=0;
leftmargin=30;
rightmargin=30;
topmargin=25;
bottommargin=25;
off=3;
scalevalue=1;
m_legendBkColor = RGB(255,255,255);
}
clPlot::~clPlot()
{
if(m_pValue!=NULL)
free(m_pValue);
}
BEGIN_MESSAGE_MAP(clPlot, CWnd)
//{{AFX_MSG_MAP(clPlot)
// NOTE - the ClassWizard will add and remove mapping macros here.
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// clPlot message handlers
void clPlot::DrawBasic(CDC* pDC)
{
CBrush brushctlBkColor(m_ctlBkColor);
pDC->FillRect(m_ctlRect,&brushctlBkColor);//给CMyView视图填充背景色
//计算趋势图边框
m_plotRect.left=m_ctlRect.left+leftmargin;
m_plotRect.right=m_ctlRect.right-rightmargin;
m_plotRect.top=m_ctlRect.top+topmargin;
m_plotRect.bottom=m_ctlRect.bottom-bottommargin;
//绘制趋势图边框
pDC->Rectangle(m_plotRect);
}
void clPlot::DrawXAxisGrid(CDC *pDC)
{
CPen *old1, *old, pen(PS_SOLID, 1, m_gridColor);//大格笔
CPen stick(PS_SOLID,0,RGB(0,0,0));//刻度笔
CPen mline(PS_SOLID,0,RGB(192,192,192));//小格笔
//横向小格宽度，分为了100个小格，10个大格
smallgridwidth=((double)m_plotRect.right-(double)m_plotRect.left)/100;
old1=pDC->SelectObject(&mline);
double x;
for(int i=1;i<=99;i++)
{
x=m_plotRect.left+smallgridwidth*i;
//逢10画大格
if(0==i%10)
{
old=pDC->SelectObject(&pen);
pDC->MoveTo(CPoint(x,m_plotRect.bottom-2));
pDC->LineTo(CPoint(x,m_plotRect.top+1));
pDC->SelectObject(old);
}
//非10画小格
else
{
pDC->MoveTo(CPoint(x,m_plotRect.bottom-2));
pDC->LineTo(CPoint(x,m_plotRect.top+1));
}
//画横向刻度
old=pDC->SelectObject(&stick);
pDC->MoveTo(CPoint(x,m_plotRect.top));
pDC->LineTo(CPoint(x,m_plotRect.top-off));
pDC->MoveTo(CPoint(x,m_plotRect.bottom));
pDC->LineTo(CPoint(x,m_plotRect.bottom+off));
pDC->SelectObject(old);
}
pDC->SelectObject(old1);
}
void clPlot::DrawYAxisGrid(CDC *pDC)
{
CPen *old, *old1, pen(PS_SOLID, 1, m_gridColor);
CPen stick(PS_SOLID,0,RGB(0,0,0));
CPen mline(PS_SOLID,0,RGB(192,192,192));
CFont m_font;
m_font.CreatePointFont(100,"Arial",pDC);
pDC->SelectObject(&m_font);
pDC->DrawText("1.0",CRect(m_plotRect.right+5,m_plotRect.bottom-10,m_plotRect.right+30,m_plotRect.bottom+10),DT_CENTER);
pDC->DrawText("5.0",CRect(m_plotRect.right+5,m_plotRect.top-5,m_plotRect.right+30,m_plotRect.top+15),DT_CENTER);
//竖向分为四十个小格，1-4V
double smallgridwidth=((double)m_plotRect.top-(double)m_plotRect.bottom)/40;
old1=pDC->SelectObject(&mline);
double y;
for(int i=1;i<=39;i++)
{
y=m_plotRect.bottom+smallgridwidth*i;
if(0==i%10)
{
scalevalue++;
old=pDC->SelectObject(&pen);
pDC->MoveTo(CPoint(m_plotRect.right-2,y));
pDC->LineTo(CPoint(m_plotRect.left+1,y));
//输出竖向刻度值
char b[20];
sprintf(b,"%.1f",scalevalue);
pDC->DrawText(b,CRect(m_plotRect.right+5,y-10,m_plotRect.right+30,y+10),DT_CENTER);
pDC->SelectObject(old);
}
else
{
pDC->MoveTo(CPoint(m_plotRect.right-2,y));
pDC->LineTo(CPoint(m_plotRect.left+1,y));
}
//画竖向刻度
old=pDC->SelectObject(&stick);
pDC->MoveTo(CPoint(m_plotRect.left,y));
pDC->LineTo(CPoint(m_plotRect.left-off,y));
pDC->MoveTo(CPoint(m_plotRect.right,y));
pDC->LineTo(CPoint(m_plotRect.right+off,y));
pDC->SelectObject(old);
}
pDC->SelectObject(old1);
scalevalue=1;
}
BOOL clPlot::AddPoint(CTime valuetime, float value)
{
//为新产生的点分配内存,此处注意malloc与realloc，我们在《项目文档》中有一篇文章谈到了他们
if(m_lNoValues > 0)
m_pValue = (pValue*)realloc(m_pValue, (m_lNoValues+1)*sizeof(pValue));
else
m_pValue = (pValue*)malloc((m_lNoValues+1)*sizeof(pValue));
//注意m_pValue为指向pValue结构体的指针，但我们可以把当作数组来使用
m_pValue[m_lend].dValue=value;
m_pValue[m_lend].ValueTime=valuetime;
m_lNoValues++;
m_lend++;
return TRUE;
}
void clPlot::DrawCurve(CDC* pDC)
{
static int docnumber=0;
docnumber++;
CPen m_pen(PS_SOLID,1,RGB(255,0,0));//为趋势图曲线建立的红色画笔
CPen* m_oldpen=pDC->SelectObject(&m_pen);
//实验用的产生1-4的随机数
float y=(double)(abs(rand())%20);
float cy=y/4;
if(cy<=1)
{
cy=1;
}
//以上为实验用数
//将随机产生的存入内存（实时数据库）
AddPoint(CTime::GetCurrentTime(),cy);
//当有了两个数据后才可以画第一条线
if(docnumber>=2)
{
int docnumber1=docnumber;
//计算我们的坐标和趋势图外框尺寸之间的比例
intervalY=m_plotRect.Height()/4;
//点的个数小于等于101时
if(docnumber<=100)
{
for(int i=0;iMoveTo(CPoint(m_plotRect.left+smallgridwidth*(100-docnumber1),m_plotRect.Height()+topmargin-
((m_pValue[i].dValue-1)*intervalY)));
pDC->LineTo(CPoint(m_plotRect.left+smallgridwidth*(100-docnumber1+1),m_plotRect.Height()+topmargin-
((m_pValue[i+1].dValue-1)*intervalY)));
}
}
//点的格数大于101时，由于我们的趋势图只能显示101个点（100个格），所以当点的个数超过
//101时，我们需要显示后101个点
else
{
for(int i=0;i<100;i++)
{
pDC->MoveTo(CPoint(m_plotRect.left+smallgridwidth*(i),m_plotRect.Height()+topmargin-
((m_pValue[i+docnumber-1-100].dValue-1)*intervalY)));
pDC->LineTo(CPoint(m_plotRect.left+smallgridwidth*(i+1),m_plotRect.Height()+topmargin-
((m_pValue[i+docnumber-100].dValue-1)*intervalY)));
}
}
pDC->SelectObject(m_oldpen);
}
}
void clPlot::DrawLegend(CDC *pDC)
{
//m_legendRect为左上小图标的区域
m_legendRect.top=m_plotRect.top+50;
m_legendRect.bottom=m_plotRect.top-15;
m_legendRect.left=m_plotRect.left+20;
m_legendRect.right=m_plotRect.left+150;
CPen pen(PS_SOLID, 1, RGB(0,0,0));
CPen *oPen = pDC->SelectObject(&pen);
CBrush *oBrush , brush(m_legendBkColor);
oBrush = pDC->SelectObject(&brush);
pDC->Rectangle(m_legendRect);
pDC->SelectObject(oBrush);
CPen m_pen(PS_SOLID,1,RGB(255,0,0));//为趋势图曲线建立的红色画笔
pDC->SelectObject(&m_pen);
pDC->MoveTo(CPoint(m_legendRect.left+10,m_legendRect.bottom+10));
pDC->LineTo(CPoint(m_legendRect.left+40,m_legendRect.bottom+10));
CFont m_font;
m_font.CreatePointFont(90,"Arial",pDC);
pDC->SelectObject(&m_font);
pDC->TextOut(m_legendRect.left+60,m_legendRect.bottom+5,"通道0");
pDC->SelectObject(oPen);
}
void clPlot::DrawLegendShadow(CDC *pDC)
{
CPen pen(PS_SOLID, 1, RGB(127,127,127));
CPen *oPen = pDC->SelectObject(&pen);
CBrush *oBrush , brush(RGB(127,127,127));
oBrush = pDC->SelectObject(&brush);
pDC->Rectangle(CRect(m_legendRect.left+5,m_legendRect.top+5,m_legendRect.right+5, m_legendRect.bottom+5));
pDC->SelectObject(oBrush);
pDC->SelectObject(oPen);
}