如何在VC中实现二维坐标系

[priest2010]

横坐标是时间序列，每0.02秒一个单位；
纵坐标是整数，取200个；
点与点之间要用线连起来
如何实现？有无代码？

[priest2010]

没人理我？
我自己顶一下！！
呵呵

[zyq5945]

	CClientDC dc(this);
	dc.MoveTo(x1,y1);//x1,y1要画的起始点坐标
	dc.LineTo(x2,y2);//x2,y2为直线的终止坐标

[priest2010]

可是怎么自定义坐标原点和画出坐标轴呢
我想要的是向上向右为正的
而且怎么在文件中读出坐标点并画图

麻烦高手给个代码

[priest2010]

又没人理我了，
我再顶！！！

[Carmack Jiang]

void CLineFitCtrl::OnPaint()
{
CPaintDC dc(this); // device context for painting
// TODO: Add your message handler code here
CRect rect,rcDraw;
GetClientRect(&rect);


// CRect rcDrawline = rect;
// rcDrawline.DeflateRect(2,2,2,2);

rcDraw = rect;
rcDraw.left = rect.left+m_uXYDataStruct.m_ptZero.X;
rcDraw.bottom = rect.bottom-m_uXYDataStruct.m_ptZero.Y;
CDC* pDC=this->GetDC();
CBrush brush(RGB(255,255,255));
CBrush* pOldBrush = pDC->SelectObject(&brush);
pDC->FillRect(rect,&brush);
//pDC->Rectangle(rcDrawline);
pDC->SelectObject(pOldBrush);



CFont font;
font.CreateFont(20, 0, 0, 0, FW_BOLD, FALSE, FALSE,0,0,0,0,ANTIALIASED_QUALITY,0, "MS Sans Serif");
CFont* pOldFont = pDC->SelectObject(&font);
pDC->SetBkMode(TRANSPARENT);

CPen pen;
pen.CreatePen(PS_SOLID,1,RGB(0,0,0));
pDC->SelectObject(&pen);
//指向原点
//pDC->SetViewportOrg(rect.left+m_uXYDataStruct.m_ptZero.X,rect.bottom - m_uXYDataStruct.m_ptZero.Y);
//pDC->SetMapMode(MM_TEXT);
pDC->SetTextColor(RGB(0,0,0));

//绘制横坐标
X0 = rect.left+m_uXYDataStruct.m_ptZero.X;
Y0 = rect.bottom - m_uXYDataStruct.m_ptZero.Y;
CString sXScale;
m_nXSizePerSacle = (rect.Width() - 80) / m_uXYDataStruct.m_nXScaleCount;
int nXScale = m_uXYDataStruct.m_fXRange / m_uXYDataStruct.m_nXScaleCount;
pDC->MoveTo(X0,Y0);
pDC->LineTo(X0,Y0 +X_SCALE_LEN);
pDC->MoveTo(X0,Y0);
sXScale.Format("%d",0);
pDC->TextOut(X0 -sXScale.GetLength()*3,Y0 + 3*X_SCALE_LEN / 2,sXScale);
for(int n=0;n <m_uXYDataStruct.m_nXScaleCount;n++)
{
sXScale.Format("%d",n*nXScale);
pDC->TextOut(X0 + m_nXSizePerSacle*n-sXScale.GetLength()*3,Y0 + 3*X_SCALE_LEN / 2,sXScale);
pDC->LineTo(X0 + m_nXSizePerSacle*n+m_nXSizePerSacle/3,Y0);
pDC->LineTo(X0 + m_nXSizePerSacle*n+m_nXSizePerSacle/3,Y0 + X_SCALE_LEN / 2);
pDC->MoveTo(X0,Y0);
pDC->LineTo(X0 + m_nXSizePerSacle*n+2*m_nXSizePerSacle/3,Y0);
pDC->LineTo(X0 + m_nXSizePerSacle*n+2*m_nXSizePerSacle/3,Y0 + X_SCALE_LEN / 2);
pDC->MoveTo(X0,Y0);
pDC->LineTo(X0 + m_nXSizePerSacle*(n+1),Y0);
pDC->LineTo(X0 + m_nXSizePerSacle*(n+1),Y0 +X_SCALE_LEN);
pDC->MoveTo(X0 + m_nXSizePerSacle*(n+1),Y0);
}
//pDC->TextOut(m_nXSizePerSacle*8,-100,"time");
//pDC->DrawText(,CRect(100,100,400,400),DT_SINGLELINE|DT_LEFT|DT_VCENTER);

m_nYSizePerSacle = (rect.Height() - 80) / m_uXYDataStruct.m_nYScaleCount;

CString sXCaption;
if(m_uCurveDataStruct.m_nCurveType == CO2)
sXCaption.Format("%s%s","CO2",m_uXYDataStruct.m_XCaption);
else if(m_uCurveDataStruct.m_nCurveType == VMR)
sXCaption.Format("%s(%s)",m_uXYDataStruct.m_YCaption,m_uXYDataStruct.m_YUnit);
CSize szXCaption;
szXCaption = pDC->GetTextExtent(sXCaption);
pDC->TextOut(X0 + m_uXYDataStruct.m_nXScaleCount*m_nXSizePerSacle - szXCaption.cx ,Y0 + X_SCALE_LEN ,sXCaption);

// CString sXUnit;
// if(m_uCurveDataStruct.m_nCurveType == CO2 && ! m_uXYDataStruct.m_XUnit.IsEmpty())
// sXUnit.Format("(%s)",m_uXYDataStruct.m_XUnit);
// else if(m_uCurveDataStruct.m_nCurveType == VMR && ! m_uXYDataStruct.m_YUnit.IsEmpty())
// sXUnit.Format("(%s)",m_uXYDataStruct.m_YUnit);
// CSize szXUnit;
// szXUnit = pDC->GetTextExtent(sXUnit);
// pDC->TextOut(X0 + m_uXYDataStruct.m_nXScaleCount*m_nXSizePerSacle -szXCaption.cx + (szXCaption.cx - szXUnit.cx)/2 ,Y0 + X_SCALE_LEN + 20 ,sXUnit);
//


//绘制纵坐标
CString sYScale;
int nYScale = m_uXYDataStruct.m_fYRange / m_uXYDataStruct.m_nYScaleCount;

pDC->MoveTo(X0,Y0);
pDC->LineTo(X0 - Y_SCALE_LEN,Y0);
pDC->MoveTo(X0,Y0);
//sYScale.Format("%d",0);
//pDC->TextOut(X0 -5*X_SCALE_LEN/2 ,Y0 - sYScale.GetLength()*3,sYScale);
//pDC->MoveTo(X0,Y0);
for(int n=0;n <m_uXYDataStruct.m_nYScaleCount;n++)
{
sYScale.Format("%d",n*nYScale);
pDC->TextOut(X0-3*Y_SCALE_LEN,Y0 - m_nYSizePerSacle*n - sYScale.GetLength()*3,sYScale);
pDC->LineTo(X0,Y0 - m_nYSizePerSacle*n - m_nYSizePerSacle/3);
pDC->LineTo(X0-Y_SCALE_LEN / 2,Y0 - m_nYSizePerSacle*n - m_nYSizePerSacle/3);
pDC->MoveTo(X0,Y0);
pDC->LineTo(X0,Y0 - m_nYSizePerSacle*n - 2*m_nYSizePerSacle/3);
pDC->LineTo(X0-Y_SCALE_LEN / 2,Y0 - m_nYSizePerSacle*n - 2*m_nYSizePerSacle/3);
pDC->MoveTo(X0,Y0);
pDC->LineTo(X0,Y0 - m_nYSizePerSacle*(n+1));
pDC->LineTo(X0-Y_SCALE_LEN ,Y0 - m_nYSizePerSacle*(n+1));
pDC->MoveTo(X0,Y0 - m_nYSizePerSacle*(n+1));
}

CSize szYCaption;
szYCaption = pDC->GetTextExtent(m_uXYDataStruct.m_YCaption);
pDC->TextOut(X0 - Y_SCALE_LEN - szYCaption.cx ,Y0 - m_nYSizePerSacle*m_uXYDataStruct.m_nYScaleCount,m_uXYDataStruct.m_YCaption);
if(! m_uXYDataStruct.m_YUnit.IsEmpty())
{
CString sYUnit;
sYUnit.Format("(%s)",m_uXYDataStruct.m_YUnit);
CSize szYUnit;
szYUnit = pDC->GetTextExtent(sYUnit);
pDC->TextOut(X0 - Y_SCALE_LEN - szYCaption.cx + (szYCaption.cx - szYUnit.cx)/2 ,Y0 - m_nYSizePerSacle*m_uXYDataStruct.m_nYScaleCount + 20 ,sYUnit);
}

pDC->MoveTo(X0,Y0 - m_uXYDataStruct.m_nYScaleCount * m_nYSizePerSacle);
pDC->LineTo(X0 + m_uXYDataStruct.m_nXScaleCount * m_nXSizePerSacle,Y0 - m_uXYDataStruct.m_nYScaleCount * m_nYSizePerSacle);
pDC->LineTo(X0 + m_uXYDataStruct.m_nXScaleCount * m_nXSizePerSacle,Y0);

// pDC->TextOut(X0 + 2*m_nXSizePerSacle,Y0 + m_nYSizePerSacle/2 ,m_uXYDataStruct.m_XCaption);
for(int i = 0;i < MAX_NUM_OF_CURVE_LINE;i ++)
DrawCurve(pDC,i);
pen.DeleteObject();
pDC->SelectObject(pOldFont);
ReleaseDC(pDC);
// Do not call CWnd::OnPaint() for painting messages
}

[priest2010]

appearance(算法，还是算法) ：
高手，能把完整的程序发给我吗？
我把上面的的程序拷到我的程序中运行不了，
我的邮箱是[e-mail]

拜托了！！！

[GONGSILIDEAIQINHAI]

怎么没下文了？？我也遇到这个问题！5楼的代码错误出现在m_uXYDataStruct这个结构体上，没有定义！
求助！关注楼主继续更新！求助！！！！！！！！！！！！