OpenCV中CvFont的定義和操作

主要是cvGetTextSize(text, &font, &text_size, &baseline);

       cvPoint(2,text_size.height+baseline)

 這樣寫出的字纔對齊得更好些。

   CvPoint pt;
   pt.x = point.x - text_size.width/2; //這樣的設置爲字體（左右）居中對齊
   pt.y = point.y + (text_size.height+baseline)/2; //這樣的設置爲字體（上下）居中對齊

 

  if(i==0) pt.y = (AVIFRAME_COLORBAR_HEIGHT-AVIFRAME_BAR_HEIGHT)+10; //設置字體輸出的具體位置
  else if(i==portion) pt.y=AVIFRAME_COLORBAR_HEIGHT-5;

 //Stage x
 CvFont font;
 cvInitFont(&font,CV_FONT_HERSHEY_DUPLEX ,1.0f,1.0f,0,1,CV_AA);
 
 char text[20];
 sprintf(text,"Stage%d",nIndex);
 CvSize text_size;
 int baseline;
 cvGetTextSize(text, &font, &text_size, &baseline);
 cvPutText(aviFrame,text,cvPoint(20,text_size.height+baseline),&font, CV_RGB(255,0,0));

 

//makeTilte
 CvFont font;
 cvInitFont(&font,CV_FONT_HERSHEY_TRIPLEX,0.35f,0.7f,0,1,CV_AA);
 char* text="Major Strain[%]";
 CvSize text_size;
 int baseline;
 cvGetTextSize(text, &font, &text_size, &baseline);
 cvPutText(colorbar,text,cvPoint(2,text_size.height+baseline),&font,CV_RGB(0,0,0));

 

//寫刻度值
 double gap=(maxLimit-minLimit)/double(portion);
 CvPoint pt;
 char  buffer[30];
 double value;
 cvInitFont(&font,CV_FONT_HERSHEY_SIMPLEX ,0.5f,0.5f,0,1,CV_AA);
 for(i=0;i<=portion;i++)
 { 
  value = (maxLimit- i*gap)*100;
  sprintf(buffer,"%4.2f",value);
  pt.x=AVIFRAME_BAR_WIDTH+10;
  if(i==0) pt.y = (AVIFRAME_COLORBAR_HEIGHT-AVIFRAME_BAR_HEIGHT)+10;
  else if(i==portion) pt.y=AVIFRAME_COLORBAR_HEIGHT-5;
  else pt.y=i*AVIFRAME_BAR_HEIGHT/portion+(AVIFRAME_COLORBAR_HEIGHT-AVIFRAME_BAR_HEIGHT);
  cvPutText(colorbar,buffer,pt,&font, CV_RGB(0,0,0));
 }

 

void CYnPlot::MakeLabelImage(IplImage** pImage,const char* text,double scale)
{
 CvFont font;
 cvInitFont(&font,CV_FONT_HERSHEY_TRIPLEX ,0.5f*scale,0.5f*scale,0,1,CV_AA);
 
 CvSize text_size;
 cvGetTextSize(text, &font, &text_size, NULL);
 
 if (*pImage) cvReleaseImage(pImage);
 *pImage = cvCreateImage(cvSize(text_size.width+5,text_size.height+10),8,3);
 cvSet(*pImage,CV_RGB(255,255,255));
 cvPutText(*pImage,text,cvPoint(2,text_size.height+3),&font, CV_RGB(0,0,0));
}

 

void CYnPlot::MakeTitleImage(IplImage** pImage,const char* text)
{
 CvFont font;
 cvInitFont(&font,CV_FONT_HERSHEY_TRIPLEX ,0.7f,0.7f,0,1,CV_AA);
 
 CvSize text_size;
 cvGetTextSize(text, &font, &text_size, NULL);
 
 if (*pImage) cvReleaseImage(pImage);
 *pImage = cvCreateImage(cvSize(text_size.width+5,text_size.height+10),8,3);
 cvSet(*pImage,CV_RGB(255,255,255));
 cvPutText(*pImage,text,cvPoint(2,text_size.height+3),&font, CV_RGB(0,0,0));
}

 

   CvFont font;
   CvSize text_size;
   cvInitFont(&font,CV_FONT_HERSHEY_SIMPLEX ,0.35f,0.35f,0,1,CV_AA);

 

   CvFont font;
   double hscale = 0.2f*_pointSize;
   cvInitFont(&font,CV_FONT_HERSHEY_TRIPLEX ,hscale,hscale,0,1,CV_AA);
   
   CvSize text_size;
   int baseline;   
   cvGetTextSize(text, &font, &text_size,&baseline);
   CvPoint pt;
   pt.x = point.x - text_size.width/2;
   pt.y = point.y + (text_size.height+baseline)/2;
   cvPutText(m_pPlotImage,text,pt,&font, color);

 

   CvFont font;
   double hscale = 0.2f*_pointSize;
   cvInitFont(&font,CV_FONT_HERSHEY_TRIPLEX ,hscale,hscale,0,1,CV_AA);
   
   CvSize text_size;
   int baseline;   
   cvGetTextSize(text, &font, &text_size,&baseline);
   CvPoint pt;
   pt.x = point.x - text_size.width/2;
   pt.y = point.y + (text_size.height+baseline)/2;
   cvPutText(m_pPlotImage,text,pt,&font, color);