gdi、gdi+文本相关函数

GDI：

TextOut()  最低级的文本输出函数，速度最快，没有裁剪，不能带tab(tab键被忽略)

TabbedTextOut()  上面函数的带tab版本

ExtTextOut()  TextOut升级版，可以调整字符间距和裁剪矩形

DrawText()  TextOut升级版，可以是多行文本，指定一个Rect，会自动换行，可以设置对齐方向

DrawTextEx()  drawText升级版，可以指定tab的显示方式

GetTextExtentPoint32()  测量某文本的显示区域

GetTabbedTextExtent()  测量带tab键的字符串的显示区域

GetTextExtentExPoint()  根据某区域测量能显示下的字符个数

GetTextMetrics()  获取字体信息

GetTextFace(hdc,100,cc);  获取设备中字体名

SetTextColor (hdc, rgbColor) 、GetTextColor	设置文本颜色，默认黑色
SetBkMode (hdc, iMode) ;	设置背景模式OPAQUE or TRANSPARENT，默认OPAQUE不透明
SetBkColor (hdc, rgbColor) ;	设置背景颜色，默认白色  WHITE_BRUSH
GetStockObject(fnObject)	获得一些默认的font , pen ,brush,所有的索引名字可以直接使用，如WHITE_BRUSH
GetSysColor(nIndex)	都到windows的系统颜色
SetTextCharacterExtra(hdc,nCharExtra)	设置TextOut等函数画的字符的横排间距
SelectObject(hdc,hgdiobj)	将某个属性选入设备环境
CreatFontIndirect(lplf)	创建字体，参数是个结构体
CreateFont	创建字体，有12个参数，不常用，上面的常用

 画路径字体(例子)

BeginPath (hdc) ;
BeginPath (hdc) ;
StrokePath (hdc) ;
FillPath (hdc) ;
FillPath (hdc) ;
hRgn = PathToRegion (hdc) ;
hRgn = PathToRegion (hdc) ;

 

 

 

 

GDI+(GDI+的文本函数比GDI慢很多):

DrawString()   画字符串

MeasureString()  获得字符串的整体显示区域信息

行	函数	备注	实例代码	截图
1	Status MeasureString( [in] const WCHAR *string, [in] INT length, [in] const Font *font, [in, ref] const PointF &origin, [out] RectF *boundingBox ) const;	用字体和起始点测量字符串的显示区域	VOID Example_MeasureString4(HDC hdc) { Graphics graphics(hdc); // Set up the string. WCHAR string[] = L"Measure Text"; Font font(L"Arial", 16); PointF origin(0.0f, 0.0f); RectF boundRect; // Measure the string. graphics.DrawString(string,12,&font,origin,&SolidBrush(Color(255,0,0,0))); graphics.MeasureString(string, 12, &font, origin, &boundRect); // Draw a rectangle that represents the size of the string. graphics.DrawRectangle(&Pen(Color(255, 0, 0, 0)), boundRect); }
2	Status MeasureString( [in] const WCHAR *string, [in] INT length, [in] const Font *font, [in, ref] const RectF &layoutRect, [out] RectF *boundingBox ) const;	用字体和限制矩形擦亮字符串的显示区域 1的基础上加了一个矩形区域比较的判断返回更小的	VOID Example_MeasureString(HDC hdc) { Graphics graphics(hdc); // Set up the string. WCHAR string[] = L"Measure Text"; Font font(L"Arial", 16); RectF layoutRect(0, 0, 100, 0); RectF boundRect; // Measure the string. graphics.DrawString(string,12,&font,PointF(0,0),&SolidBrush(Color(100,255,0,0))); graphics.DrawString(string,12,&font,RectF(0,0,100,500),&StringFormat(),&SolidBrush(Color(100,0,255,0))); graphics.MeasureString(string, 12, &font, layoutRect, &boundRect); // Draw a rectangle that represents the size of the string. graphics.DrawRectangle(&Pen(Color(255, 255, 0, 0)), boundRect); //高度为0可以自动测量高度 layoutRect = RectF(0, 0, 500, 0); graphics.MeasureString(string, 12, &font, layoutRect, &boundRect); // Draw a rectangle that represents the size of the string. graphics.DrawRectangle(&Pen(Color(255, 0, 255, 0)), boundRect); }
3	Status MeasureString( [in] const WCHAR *string, [in] INT length, [in] const Font *font, [in, ref] const PointF &origin, [in] const StringFormat *stringFormat, [out] RectF *boundingBox ) const;	1的带StringFormat的版本	VOID Example_MeasureString5(HDC hdc) { Graphics graphics(hdc); // Set up the string. WCHAR string[] = L"Measure Text"; Font font(L"Arial", 16); PointF origin(0.0f, 0.0f); StringFormat format; format.SetAlignment(StringAlignmentCenter); RectF boundRect; // Measure the string. graphics.DrawString(string,12,&font,PointF(0,0),&format,&SolidBrush(Color(100,255,0,0))); graphics.MeasureString(string, 12, &font, origin, &format, &boundRect); // Draw a rectangle that represents the size of the string. graphics.DrawRectangle(&Pen(Color(255, 0, 0, 0)), boundRect); }
4	Status MeasureString( [in] const WCHAR *string, [in] INT length, [in] const Font *font, [in, ref] const RectF &layoutRect, [in] const StringFormat *stringFormat, [out] RectF *boundingBox, [out] INT *codepointsFitted, [out] INT *linesFilled ) const;	2的加强版，可以测量指定区域显示下的字符的个数	VOID Example_MeasureString2(HDC hdc) { Graphics graphics(hdc); // Set up the string. WCHAR string[] = L"Measure Text"; Font font(L"Arial", 16); RectF layoutRect(0.0f, 0.0f, 70, 50.0f); StringFormat format; format.SetAlignment(StringAlignmentFar); RectF boundRect; // Measure the string. int codepointsFitted; int linesFilled; graphics.DrawString(string,12,&font,layoutRect,&format,&SolidBrush(Color(255,0,0,0))); graphics.MeasureString(string, 12, &font, layoutRect, &format, &boundRect,&codepointsFitted,&linesFilled); // Draw a rectangle that represents the size of the string. graphics.DrawRectangle(&Pen(Color(255, 0, 0, 0)), boundRect); WCHAR *count = new WCHAR[100]; swprintf(count,100 , L"codepointsFitted:%d linesFilled:%d",codepointsFitted,linesFilled); graphics.DrawString(L"字符串Measure Text，长度12",-1,&font,PointF(0,70),&SolidBrush(Color(255,0,0,0))); graphics.DrawString(count,-1,&font,PointF(0,90),&SolidBrush(Color(255,0,0,0))); }
5	Status MeasureString( [in] const WCHAR *string, [in] INT length, [in] const Font *font, [in, ref] const SizeF &layoutRectSize, [in] const StringFormat *stringFormat, [out] SizeF *size, [out] INT *codepointsFitted, [out] INT *linesFilled ) const;	4的RectF换成了SizeF，其他一样，不要位置只要大小，其实位置没有什么用，所以4很少用到	同上	同上

MeasureCharacterRanges()  获得字符串的特定字符的显示位置

Status MeasureCharacterRanges( [in] const WCHAR *string, [in] INT length, [in] const Font *font, [in, ref] const Rectf &layoutRect, [in] const StringFormat *stringFormat, [in] INT regionCount, [out] Region *regions ) const;

测量字符的显示区域

VOID MeasureCharRanges(HDC hdc)
{
   Graphics graphics(hdc);

   // Brushes and pens used for drawing and painting
   SolidBrush blueBrush(Color(255, 0, 0, 255));
   SolidBrush redBrush(Color(100, 255, 0, 0));
   Pen        blackPen(Color(255, 0, 0, 0));

   // Layout rectangles used for drawing strings
   RectF   layoutRect_A(20.0f, 20.0f, 130.0f, 130.0f);
   RectF   layoutRect_B(160.0f, 20.0f, 165.0f, 130.0f);
   RectF   layoutRect_C(335.0f, 20.0f, 165.0f, 130.0f);

   // Three different ranges of character positions within the string
   CharacterRange charRanges[3] = { CharacterRange(3, 5),
                                    CharacterRange(15, 2),
                                    CharacterRange(30, 15), };

   // Font and string format to apply to string when drawing
   Font         myFont(L"Times New Roman", 16.0f);
   StringFormat strFormat;

    // Other variables
   Region* pCharRangeRegions; // pointer to CharacterRange regions
   short   i;                 // loop counter
   INT     count;             // number of character ranges set
   WCHAR   string[] = L"The quick, brown fox easily jumps over the lazy dog.";


   // Set three ranges of character positions.
   strFormat.SetMeasurableCharacterRanges(3, charRanges);

   // Get the number of ranges that have been set, and allocate memory to 
   // store the regions that correspond to the ranges.
   count = strFormat.GetMeasurableCharacterRangeCount();
   pCharRangeRegions = new Region[count];

   // Get the regions that correspond to the ranges within the string when
   // layout rectangle A is used. Then draw the string, and show the regions.
   graphics.MeasureCharacterRanges(string, -1,
      &myFont, layoutRect_A, &strFormat, count, pCharRangeRegions);
   graphics.DrawString(string, -1,
      &myFont, layoutRect_A, &strFormat, &blueBrush);
   graphics.DrawRectangle(&blackPen, layoutRect_A);
   for ( i = 0; i < count; i++)
   {
      graphics.FillRegion(&redBrush, pCharRangeRegions + i);
   }

   // Get the regions that correspond to the ranges within the string when
   // layout rectangle B is used. Then draw the string, and show the regions.
   graphics.MeasureCharacterRanges(string, -1,
      &myFont, layoutRect_B, &strFormat, count, pCharRangeRegions);
   graphics.DrawString(string, -1,
      &myFont, layoutRect_B, &strFormat, &blueBrush);
   graphics.DrawRectangle(&blackPen, layoutRect_B);
   for ( i = 0; i < count; i++)
   {
      graphics.FillRegion(&redBrush, pCharRangeRegions + i);
   }

   // Get the regions that correspond to the ranges within the string when
   // layout rectangle C is used. Set trailing spaces to be included in the
   // regions. Then draw the string, and show the regions.
   strFormat.SetFormatFlags(StringFormatFlagsMeasureTrailingSpaces);
   graphics.MeasureCharacterRanges(string, -1,
      &myFont, layoutRect_C, &strFormat, count, pCharRangeRegions);
   graphics.DrawString(string, -1,
      &myFont, layoutRect_C, &strFormat, &blueBrush);
   graphics.DrawRectangle(&blackPen, layoutRect_C);
   for ( i = 0; i < count; i++)
   {
      graphics.FillRegion(&redBrush, pCharRangeRegions + i);
   }
   // Delete memory for the range regions.
   delete [] pCharRangeRegions;
}