求在vc中使用二维坐标的空间，能够放大缩小整个图片的控件或方法。

Question

求一个能够根据一个2维数组的离散数据画出一个二维坐标的控件，控件能放大缩小里面图片，鼠标点到曲线上能够动态显示当前数据，谢谢了 最好是vc的，vs做也可以（一定要用c++）二维坐标  动态显示

Answer 1

没有现成的
你得自己做
放大缩小用StretchBlt
数据我没理解错的话就是描点绘图吧

Answer 2

StretchBlt的效果很差
还是找一个图像放大缩小的算法吧

Answer 3

现在做出了画出坐标和曲线 问下怎么实现 显示坐标和 放大缩小 就是具体怎么写void Onmousemove 和OnMouseWheel()两个消息响应函数
 CMypaintDlg::paint2()
{
    int width=500;
    int height=300;
    int m_rowX=0;
    //确定坐标图四周预留的空白大小
    const int mytop=10;
    const int mybottom=40;
    const int myleft=60;
    const int myright=10;
    const int x_distance=15;
    //确定X，Y轴每单位显示宽度
      float m_x_num=30,m_y_num=10,m_potY2=100;
       intervalX=(width-myleft-myright)/(m_x_num);
      intervalY=(height-mybottom-mytop)/(m_y_num);
   //确定显示刻度个数
    float bottomY=0;
    float leftX=0;
    const int count_x=(int)m_x_num;
    const int count_y=(int)m_y_num;     
    //确定每个显示刻度之间的宽度    
    float spaceX=(float)(width-myleft-myright)/count_x;    
    float spaceY=(float)(height-mybottom-mytop)/count_y; 
CClientDC dc(this);
CDC* pDC=&dc;
    //x轴
int o_x=myleft,o_y=height-mybottom;
    pDC->MoveTo(o_x,o_y);//原点
    pDC->LineTo(int(width-myright),o_y);
    
    //Y轴    从图形区域最底端到最顶端
    //电流坐标轴 兰
    m_rowX = int(myleft+(leftX)*intervalX);
     CPen pen1(PS_SOLID,2,RGB(0,0,255));
   CPen *pOldPen1=pDC->SelectObject(&pen1);
    pDC->MoveTo(o_x,o_y);
    pDC->LineTo(o_x,int(mytop));
    pDC->SelectObject(pOldPen1);    
    //绘制刻度和刻度值    
    CString str;
         //选择字体
    CFont font;
    font.CreateFont(14,4,0,0,FW_REGULAR,FALSE,FALSE,0,ANSI_CHARSET,OUT_STROKE_PRECIS,
      CLIP_DEFAULT_PRECIS,PROOF_QUALITY,FIXED_PITCH | FF_MODERN,"Arial");
     CFont* def_font=pDC->SelectObject(&font);
    //X轴  
    for(int i=0;i<=count_x;i++)
    {             
       pDC->MoveTo(int(myleft+spaceX*i),int(height-(mybottom+(bottomY)*intervalY)));
       pDC->LineTo(int(myleft+spaceX*i),int(height-(mybottom+(bottomY)*intervalY+5)));
   str.Format("%d",i);
pDC->TextOut(int(myleft+spaceX*i-3), int(height-(mybottom+(bottomY)*intervalY-5)),str);   
    }
    
    //Y轴
    CPen pen3(PS_SOLID,1,RGB(0,0,255));
    CPen *pOldPen3=pDC->SelectObject(&pen3);
    for(i=0;i<=count_y;i++)     
    {     
      pDC->MoveTo(m_rowX,int(height-(mybottom+spaceY*i)));     
       pDC->LineTo(m_rowX+5,int(height-(mybottom+spaceY*i)));
   str.Format("%d",i);
      pDC->TextOut(m_rowX-x_distance, int(height-(mybottom+spaceY*i+8)),str); 
    }
pDC->SelectObject(pOldPen3);
   
//绘制网格
    CPen pen6(PS_DOT,1,RGB(200,240,240));
    CPen *pOldPen6=pDC->SelectObject(&pen6);
    for(i=1;i<=count_y;i++)
{     
   pDC->MoveTo(m_rowX+10,int(height-mybottom-i*spaceY));
   pDC->LineTo(width,int(height-mybottom-i*spaceY));
}
    for(i=1;i<count_x;i++)
{
      pDC->MoveTo(int(m_rowX+i*spaceX),int(height-mybottom));
      pDC->LineTo(int(m_rowX+i*spaceX),mytop);
}
     pDC->SelectObject(pOldPen6); 
//绘制X，Y轴的变量名
   CFont font1;
    font1.CreateFont(15,6,0,0,FW_REGULAR,FALSE,FALSE,0,ANSI_CHARSET,OUT_STROKE_PRECIS,
     CLIP_DEFAULT_PRECIS,PROOF_QUALITY,FIXED_PITCH | FF_SWISS,"Arial");
    CFont* def_font1=pDC->SelectObject(&font1);
    pDC->TextOut(width/2,height-20,"时间(s)");
    pDC->TextOut(o_x-60,mytop,"(Value)");
    pDC->SelectObject(def_font1);
//绘制 曲线
int x_data[5]={2,6,8,14,17};
int data[5]={2,6,1,3,7};

CPen pendata(PS_DOT,1,RGB(255,0,0));
CPen *pOldPendata=pDC->SelectObject(&pendata);
for (i=0;i<4;i++)
{
pDC->MoveTo(o_x+spaceX*x_data[i],o_y-spaceY*data[i]);
pDC->LineTo(o_x+spaceX*x_data[i+1],o_y-spaceY*data[i+1]);
 }
}void CMypaintDlg::OnMouseMove(UINT nFlags, CPoint point) 
{
// TODO: Add your message handler code here and/or call default
CMypaintDlg *pdlg=(CMypaintDlg*)AfxGetMainWnd(); float cur_x,cur_y;
m_cur_x.Format("%f",cur_x);
    m_cur_y.Format("%d",cur_y);
UpdateData(FALSE);

CDialog::OnMouseMove(nFlags, point);
}BOOL CMypaintDlg::OnMouseWheel(UINT nFlags, short zDelta, CPoint pt) 
{
// TODO: Add your message handler code here and/or call default
return CDialog::OnMouseWheel(nFlags, zDelta, pt);
}
}