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Question

我在对话框中画图，就是把一个运算过程的收敛曲线表示出来，有三条线。每次重画的时候都是强制刷新，结果有的时候程序运行很正常，有的时候计算到一半或者计算结束之后，窗口就自己最大化了，也就是对整个屏幕在刷新，请问是怎么回事？
补充一下，大部分时间程序不会出现这种情况

Answer 1

void CVaneDlg2::OnPaint() 
{
CPaintDC dc(this); // device context for painting
//曲线重画
unsigned int i;
CRect rectClip;if(dc.GetClipBox(&rectClip)!=NULLREGION&&mflag==1)
{
myvane.initreport(myvane.maxgen,myvane.bmax,myvane.bmin);
for(i=0;i<myvane.gen;i++){
myvane.report(myvane.maxPoint[i],myvane.maxPoint[i+1],RGB(255,0,0));
myvane.report(myvane.minPoint[i],myvane.minPoint[i+1],RGB(0,255,0));
myvane.report(myvane.avgPoint[i],myvane.avgPoint[i+1],RGB(0,0,255));
}
}
 
//my code 
  //文本重画CRect rect;
  dc.GetClipBox(&rectClip);
  CSize size;
 CStringList m_strList;
  CString m_strLastLine;
TEXTMETRIC tm;
dc.GetTextMetrics(&tm);
int nLineHeight=tm.tmHeight+tm.tmExternalLeading;
CString str;
int line=0;
POSITION pos=m_strList.GetHeadPosition();
  for(;pos!=NULL;m_strList.GetNext(pos))
  {
  str=m_strList.GetAt(pos);
  size=dc.GetTextExtent(str);
  rect.SetRect(0,line*nLineHeight,size.cx,line*nLineHeight+size.cy);
  if(!(rect&rectClip).IsRectEmpty())
 dc.TextOut(0,line*nLineHeight,str);
  line++;
  }
  str=m_strLastLine;
  size=dc.GetTextExtent(str);
  rect.SetRect(0,line*nLineHeight,size.cx,line*nLineHeight+size.cy);
  if(!(rect&rectClip).IsRectEmpty())
 dc.TextOut(0,line*nLineHeight,str);}/*初始数据输出*/
void CVane::initreport(unsigned int seed,double a,double b)
{
CVaneApp *app = (CVaneApp *)AfxGetApp();
CVaneSheet* myp=(CVaneSheet*)app->pWnd;
CVaneDlg2* myp2=(CVaneDlg2*)myp->m_page3.p;
   
drawfig(40,20,440,380,a,b,seed);//画刻度表CWnd* p=(CWnd*)myp2->GetDlgItem(IDC_STATIC21);
p->ShowWindow(SW_SHOW);
p=(CWnd*)myp2->GetDlgItem(IDC_STATIC22);
p->ShowWindow(SW_SHOW);
p=(CWnd*)myp2->GetDlgItem(IDC_STATIC23);
p->ShowWindow(SW_SHOW);
p=(CWnd*)myp2->GetDlgItem(IDC_STATIC24);
p->ShowWindow(SW_SHOW);
p=(CWnd*)myp2->GetDlgItem(IDC_STATIC25);
p->ShowWindow(SW_SHOW);
p=(CWnd*)myp2->GetDlgItem(IDC_STATIC26);
p->ShowWindow(SW_SHOW);myp2->m_tcolor22.SetTextColor(RGB(0,0,255));
myp2->m_tcolor21.SetTextColor(RGB(255,0,0));
myp2->m_tcolor23.SetTextColor(RGB(0,255,0));
myp2->m_tcolor25.SetTextColor(RGB(0,0,255));
myp2->m_tcolor24.SetTextColor(RGB(255,0,0));
myp2->m_tcolor26.SetTextColor(RGB(0,255,0));}/*图文输出以及数据存储*/
void CVane::report(CPoint point1,CPoint point2,COLORREF m_colors)
{
int i;
CVaneApp *app = (CVaneApp *)AfxGetApp();
CVaneSheet* myp=(CVaneSheet*)app->pWnd;
CVaneDlg2* myp2=(CVaneDlg2*)myp->m_page3.p;
    HWND hwnd=myp2->GetSafeHwnd();
mypen.DeleteObject();
mypen.CreatePen(PS_SOLID,1,m_colors);CDC dc;
 CMemDC  dc1(&dc);
dc1.Attach(::GetDC(hwnd));
dc1.SelectObject(&mypen); if(point2.y>(2*bmax-bmin)){
do{bmax=2*bmax-bmin;}while((2*bmax-bmin)<=point2.y);
CRect rect;
rect.SetRect(40,20,440,380);
myp2->InvalidateRect(&rect);
myp2->UpdateWindow();
initreport(maxgen,bmax,bmin);for(i=0;i<unsigned long(point2.x);i++){
report(minPoint[i],minPoint[i+1],GREEN);
report(avgPoint[i],avgPoint[i+1],BLUE);
report(maxPoint[i],maxPoint[i+1],RED);}
} else{if(len==1){dc1.MoveTo(40+unsigned long((float(400))/(5*fenshu)*point1.x),380-unsigned long(float(180)/(pow(10,len1-1)*fenshu1)*(point1.y-start)));
dc1.LineTo(40+unsigned long((float(400))/(5*fenshu)*point2.x),380-unsigned long(float(180)/(pow(10,len1-1)*fenshu1)*(point2.y-start)));}
else {dc1.MoveTo(40+unsigned long((float(400)/(((long(pow(10,len-1))/2)*fenshu)))*point1.x),380-unsigned long(float(180)/(pow(10,len1-1)*fenshu1)*(point1.y-start)));
dc1.LineTo(40+unsigned long((float(400)/(((long(pow(10,len-1))/2)*fenshu)))*point2.x),380-unsigned long(float(180)/(pow(10,len1-1)*fenshu1)*(point2.y-start)));
}}
}还有我在主画图函数中每次画完都强制刷新
代码如下：
{
 report(point[0],point[1],RED);
report(point1[0],point1[1],GREEN);
report(point2[0],point2[1],BLUE);
CRect rect;
dc1.GetClipBox(&rect);
myp2->InvalidateRect(&rect);
myp2->UpdateWindow();
}

Answer 2

不从一下drawfig函数
void CVane::drawfig(int left,int top,int right ,int bottom,double max,double min,int n)
{int i;
CVaneApp *app = (CVaneApp *)AfxGetApp();
CVaneSheet* myp=(CVaneSheet*)app->pWnd;
CVaneDlg2* myp2=(CVaneDlg2*)myp->m_page3.p;
    HWND hwnd=myp2->GetSafeHwnd();
mypen.DeleteObject();
mypen.CreatePen(PS_SOLID,1,RGB(0,0,0));
    CDC dc;
 CMemDC  dc1(&dc);
// CString string;
// string="the SGA For Vane Setting";
dc1.Attach(::GetDC(hwnd));
dc1.SelectObject(&mypen);/* RECT rc = { 20, 20, 440, 420 };
m_hBlack=GetSysColorBrush(COLOR_BTNFACE);
Rectangle(dc1.m_hDC, rc.left, rc.top, rc.right, rc.bottom);// The Win32 call to FillRect requires an HBRUSH.
// The HBRUSH operator used here makes a temporary
// CBrush object which is cast to the required type.
FillRect(dc.m_hDC, &rc, m_hBlack);
*/
//画表格边框
dc1.MoveTo(left,top);
dc1.LineTo(left,bottom);
dc1.MoveTo(left,bottom);
dc1.LineTo(right,bottom); dc1.MoveTo(right,bottom);
dc1.LineTo(right,top);
dc1.MoveTo(right,top);
dc1.LineTo(left,top);
//画横坐标刻度
CString str1;
str1.Format("%d",n);
 len=str1.GetLength();
if(len==1){if(n<=5)fenshu=1;
else fenshu=2;}
else {if(n%(long(pow(10,len-1))/2)==0)
fenshu=n/(long(pow(10,len-1))/2);
else fenshu=n/(long(pow(10,len-1))/2)+1;
} for(i=0;i<5*fenshu;i++)
{
dc1.MoveTo(left+unsigned long((float(right-left)/fenshu)*(i+1)/5),bottom);
dc1.LineTo(left+unsigned long((float(right-left)/fenshu)*(i+1)/5),bottom-2);}
for(i=0;i<fenshu;i++)
{
dc1.MoveTo(left+unsigned long((float(right-left)/fenshu)*(i+1)),bottom);
dc1.LineTo(left+unsigned long((float(right-left)/fenshu)*(i+1)),bottom-4);}
for(i=0;i<fenshu/2;i++)
{
dc1.MoveTo(left+unsigned long(2*(float(right-left)/fenshu)*(i+1)),bottom);
dc1.LineTo(left+unsigned long(2*(float(right-left)/fenshu)*(i+1)),bottom-7);}//设置横坐标数值
CString str;
//设置字体
 CFont font;
font.CreateFont(-12,           //字体字符的逻辑高度
             0,                //字符平均宽度取默认值
 0,                //文本行角度为0，水平
 0,                //字符角度为0，正立
 FW_NORMAL,        //正常字体
 FALSE,            //不倾斜 
 FALSE,            //不加下划线
 FALSE,            //不加删除线
 ANSI_CHARSET,       
 OUT_DEFAULT_PRECIS,
 CLIP_DEFAULT_PRECIS,
 DEFAULT_QUALITY,
 DEFAULT_PITCH|FF_MODERN,
 "Times New Roman");
CFont *oldFont=dc1.SelectObject (&font);
// dc1.SelectObject(oldFont);COLORREF crColor=GetSysColor(COLOR_BTNFACE); 
dc1.SetBkColor(crColor);
int x,y;
x=36;y=388;
CString str3;
if(fenshu==1){
dc1.TextOut(x,y,"0");
x+=float(right-left);
dc1.TextOut(x,y,"5");}
else if(fenshu==2&&n<10){dc1.TextOut(x,y,"0");
x+=float(right-left)/2;
dc1.TextOut(x,y,"5");
x+=float(right-left)/2;
dc1.TextOut(x,y,"10");}
else {for(i=0;i<=fenshu/2;i++){
str3.Format("%d",long(pow(10,len-1))*i);
dc1.TextOut(x,y,str3);
x+=2*(float(right-left)/fenshu);
}}/*str.Format("%d",n/4);
p->SetWindowText(str);
p=(CWnd*)myp2->GetDlgItem(IDC_STATICC3);
str.Format("%d",n/2);
p->SetWindowText(str);
p=(CWnd*)myp2->GetDlgItem(IDC_STATICC4);
str.Format("%d",3*n/4);
p->SetWindowText(str);
p=(CWnd*)myp2->GetDlgItem(IDC_STATICC5);
str.Format("%d",n);
p->SetWindowText(str);
*/
/*for(i=0;i<39;i++)
{
dc1.MoveTo(left+unsigned long(float(right-left)/40)*(i+1),bottom);
dc1.LineTo(left+unsigned long(float(right-left)/40)*(i+1),bottom-3);}dc1.MoveTo(left+unsigned long(float(right-left)/40)*10,bottom);
dc1.LineTo(left+unsigned long(float(right-left)/40)*10,bottom-7);
dc1.MoveTo(left+unsigned long(float(right-left)/40)*20,bottom);
dc1.LineTo(left+unsigned long(float(right-left)/40)*20,bottom-7);
dc1.MoveTo(left+unsigned long(float(right-left)/40)*30,bottom);
dc1.LineTo(left+unsigned long(float(right-left)/40)*30,bottom-7);
//设置横坐标数值
 p=(CWnd*)myp2->GetDlgItem(IDC_STATICC1);
p->SetWindowText("0");
p=(CWnd*)myp2->GetDlgItem(IDC_STATICC2);
CString str;
str.Format("%d",n/4);
p->SetWindowText(str);
p=(CWnd*)myp2->GetDlgItem(IDC_STATICC3);
str.Format("%d",n/2);
p->SetWindowText(str);
p=(CWnd*)myp2->GetDlgItem(IDC_STATICC4);
str.Format("%d",3*n/4);
p->SetWindowText(str);
p=(CWnd*)myp2->GetDlgItem(IDC_STATICC5);
str.Format("%d",n);
p->SetWindowText(str);*/
int hight=bottom-top;
int chazhi=max-min;
//画纵坐标刻度
CString str2;
str2.Format("%d",chazhi);
    len1=str2.GetLength();
if(len1==1){fenshu1=1;}
else {if(chazhi%(long(pow(10,len1-1)))==0)
fenshu1=chazhi/(long(pow(10,len1-1)));
else fenshu1=chazhi/(long(pow(10,len1-1)))+1;
}
//找到起点
start=(long(min)/long(pow(10,len1-1)))*long(pow(10,len1-1)); for(i=0;i<2*fenshu1;i++)
{
dc1.MoveTo(left,bottom-long(float(180)/fenshu1*(i+1)));
dc1.LineTo(left+7,bottom-long(float(180)/fenshu1*(i+1)));}
for(i=0;i<10*fenshu1;i++)
{
dc1.MoveTo(left,bottom-long(float(180)/(5*fenshu1)*(i+1)));
dc1.LineTo(left+2,bottom-long(float(180)/(5*fenshu1)*(i+1)));}/*for(i=0;i<(39);i++)
{
dc1.MoveTo(left,bottom-kedu*(i+1));
dc1.LineTo(left+3,bottom-kedu*(i+1));}dc1.MoveTo(left,bottom-kedu*10);
dc1.LineTo(left+7,bottom-kedu*10);
dc1.MoveTo(left,bottom-kedu*20);
dc1.LineTo(left+7,bottom-kedu*20);
dc1.MoveTo(left,bottom-kedu*30);
dc1.LineTo(left+7,bottom-kedu*30);
*/
//设置纵坐标数值
int x1,y1;
x1=0;y1=373;
CString str4;
for(i=0;i<=2*fenshu1;i++){
str4.Format("%d",start+long(pow(10,len1-1))*2*i);
dc1.TextOut(x1,y1,str4);
y1-=(float((bottom-top))/fenshu1);
}
/*if((2*max-min)>100000.0){max=max/10;min=min/10;}
unsigned long x1,x2,x3,x4,x5;
x1=unsigned long(min);
x2=unsigned long((max+min)/2);
x3=2*x2-x1;
x4=x2-x1+x3;
x5=x4+x2-x1;CWnd* p=(CWnd*)myp2->GetDlgItem(IDC_STATICC6);
str.Format("%d",x1);
p->SetWindowText(str);
p=(CWnd*)myp2->GetDlgItem(IDC_STATICC7);
str.Format("%d",x2);
p->SetWindowText(str);
p=(CWnd*)myp2->GetDlgItem(IDC_STATICC8);
str.Format("%d",x3);
p->SetWindowText(str);
p=(CWnd*)myp2->GetDlgItem(IDC_STATICC9);
str.Format("%d",x4);
p->SetWindowText(str);
p=(CWnd*)myp2->GetDlgItem(IDC_STATICC10);
str.Format("%d",x5);
p->SetWindowText(str);*/}