新建一个单文档的程序(Test)
创建一个插入符。
int CTestView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CView::OnCreate(lpCreateStruct) == -1)
return -1;
CClientDC dc(this);
TEXTMETRIC tm;
dc.GetTextMetrics(&tm);
CreateSolidCaret(tm.tmAveCharWidth/8,tm.tmHeight);//tm.tmAveCharWidth/8是经验
ShowCaret( );
// TODO: Add your specialized creation code here
return 0;
}
下面创建一个图形的插入符:
int CTestView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CView::OnCreate(lpCreateStruct) == -1)
return -1;
CBitmap* pBitmap = new CBitmap;
pBitmap->LoadBitmap(IDB_BITMAP1);
CreateCaret(pBitmap);
ShowCaret();
// TODO: Add your specialized creation code here
return 0;
}
void CTestView::OnDraw(CDC* pDC)
{
CTestDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
CString str1;
str1.LoadString(IDS_STR1);//IDS_STR1在资源视图中的String Table中有定义
pDC->TextOut(0,0,str1);
// TODO: add draw code for native data here
}
下面是路径层的概念:(和轨迹相似)
void CTestView::OnDraw(CDC* pDC)
{
CTestDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
CString str1;
str1.LoadString(IDS_STR1);//IDS_STR1在资源视图中的String Table中有定义
CSize sizestr1=pDC->GetTextExtent(str1);
pDC->BeginPath();
pDC->Rectangle(CRect(0,0,sizestr1.cx,sizestr1.cy));//在路径层中做的操作是看不见的。在路径层中只能做图
pDC->EndPath();
pDC->TextOut(0,0,str1);
pDC->SelectClipPath(RGN_DIFF);
//SelectClipPath在它的矩形的范围内对下面的操作有影响。
for (int i=0;i<300;i=i+5)
{
pDC->MoveTo(0,i);
pDC->LineTo(300,i);
pDC->MoveTo(i,0);
pDC->LineTo(i,300);
}
//SelectClipPath对str2有影响。
CString str2="yyyyyyyyyy";
pDC->TextOut(200,200,str2);
// TODO: add draw code for native data here
}
下面是字符输入的功能:
为VIEW类添加:
private:
CString m_str;并初始化。
CPoint m_dnpt; 初始化。
void CTestView::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
// TODO: Add your message handler code here and/or call default
CClientDC dc(this);
TEXTMETRIC tmc;
dc.GetTextMetrics(&tmc);
CFont font;
font.CreatePointFont(120, "Arial", &dc);
CFont* def_font = dc.SelectObject(&font);
// dc.SelectObject(def_font);
//font.DeleteObject();
if (0x0d==nChar)
{
m_str.Empty();
m_dnpt.y+=tmc.tmHeight;
}
else if (0x08==nChar)//先白色输出,再用黑色输出去掉后的字符
{
COLORREF txprevcolor=dc.SetTextColor(dc.GetBkColor());
dc.TextOut(m_dnpt.x,m_dnpt.y,m_str);//用白色输出字符
m_str=m_str.Left(m_str.GetLength()-1);
dc.SetTextColor(txprevcolor);
}
else
{
m_str+=nChar;
}
CSize size=dc.GetTextExtent(m_str);
SetCaretPos(CPoint(size.cx+m_dnpt.x,m_dnpt.y));
dc.TextOut(m_dnpt.x,m_dnpt.y,m_str);
dc.SelectObject(def_font);
font.DeleteObject();
CView::OnChar(nChar, nRepCnt, nFlags);
}
void CTestView::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
//将插入符移到左键位置
SetCaretPos( point );
m_str.Empty();
m_dnpt=point;
CView::OnLButtonDown(nFlags, point);
}
下面模拟卡拉OK字幕变色功能:
为VIEW的ONCREATE函数添加:SetTimer(1,1000,NULL);
为VIEW类增加:int m_nwidth; CString m_colstr;(初始化为0)
在ONDRAW函数中添加:
m_colstr="模仿卡拉OK的变色功能";
pDC->TextOut(300,300,m_colstr);
void CTestView::OnTimer(UINT nIDEvent)
{
// TODO: Add your message handler code here and/or call default
CClientDC dc(this);
TEXTMETRIC textm;
dc.GetTextMetrics(&textm);
static CRect rect;
rect.left=300;
rect.top=300;
rect.bottom=300+textm.tmHeight;
rect.right=300+m_nwidth;
if (m_nwidth>=dc.GetTextExtent(m_colstr).cx)
{
m_nwidth=0;
dc.SetTextColor(RGB(0,255,0));
}
else
{
m_nwidth+=5;
dc.SetTextColor(RGB(255,0,0));
}
dc.DrawText(m_colstr,rect,DT_CENTER);
CView::OnTimer(nIDEvent);
}