OpenCV中CvFont的定义和操作

 1 CvPoint pt;
 2    pt.x = point.x - text_size.width/2; //这样的设置为字体（左右）居中对齐
 3    pt.y = point.y + (text_size.height+baseline)/2; //这样的设置为字体（上下）居中对齐
 4  
 5   if(i==0) pt.y = (AVIFRAME_COLORBAR_HEIGHT-AVIFRAME_BAR_HEIGHT)+10; //设置字体输出的具体位置
 6   else if(i==portion) pt.y=AVIFRAME_COLORBAR_HEIGHT-5;
 7  //Stage x
 8  CvFont font;
 9  cvInitFont(&font,CV_FONT_HERSHEY_DUPLEX ,1.0f,1.0f,0,1,CV_AA);
10  
11  char text[20];
12  sprintf(text,"Stage%d",nIndex);
13  CvSize text_size;
14  int baseline;
15  cvGetTextSize(text, &font, &text_size, &baseline);
16  cvPutText(aviFrame,text,cvPoint(20,text_size.height+baseline),&font, CV_RGB(255,0,0));
17  
18 //makeTilte
19  CvFont font;
20  cvInitFont(&font,CV_FONT_HERSHEY_TRIPLEX,0.35f,0.7f,0,1,CV_AA);
21  char* text="Major Strain[%]";
22  CvSize text_size;
23  int baseline;
24  cvGetTextSize(text, &font, &text_size, &baseline);
25  cvPutText(colorbar,text,cvPoint(2,text_size.height+baseline),&font,CV_RGB(0,0,0));
26  
27 //写刻度值
28  double gap=(maxLimit-minLimit)/double(portion);
29  CvPoint pt;
30  char  buffer[30];
31  double value;
32  cvInitFont(&font,CV_FONT_HERSHEY_SIMPLEX ,0.5f,0.5f,0,1,CV_AA);
33  for(i=0;i<=portion;i++)
34  { 
35   value = (maxLimit- i*gap)*100;
36   sprintf(buffer,"%4.2f",value);
37   pt.x=AVIFRAME_BAR_WIDTH+10;
38   if(i==0) pt.y = (AVIFRAME_COLORBAR_HEIGHT-AVIFRAME_BAR_HEIGHT)+10;
39   else if(i==portion) pt.y=AVIFRAME_COLORBAR_HEIGHT-5;
40   else pt.y=i*AVIFRAME_BAR_HEIGHT/portion+(AVIFRAME_COLORBAR_HEIGHT-AVIFRAME_BAR_HEIGHT);
41   cvPutText(colorbar,buffer,pt,&font, CV_RGB(0,0,0));
42  }
43  
44 void CYnPlot::MakeLabelImage(IplImage** pImage,const char* text,double scale)
45 {
46  CvFont font;
47  cvInitFont(&font,CV_FONT_HERSHEY_TRIPLEX ,0.5f*scale,0.5f*scale,0,1,CV_AA);
48  
49  CvSize text_size;
50  cvGetTextSize(text, &font, &text_size, NULL);
51  
52  if (*pImage) cvReleaseImage(pImage);
53  *pImage = cvCreateImage(cvSize(text_size.width+5,text_size.height+10),8,3);
54  cvSet(*pImage,CV_RGB(255,255,255));
55  cvPutText(*pImage,text,cvPoint(2,text_size.height+3),&font, CV_RGB(0,0,0));
56 }
57  
58 void CYnPlot::MakeTitleImage(IplImage** pImage,const char* text)
59 {
60  CvFont font;
61  cvInitFont(&font,CV_FONT_HERSHEY_TRIPLEX ,0.7f,0.7f,0,1,CV_AA);
62  
63  CvSize text_size;
64  cvGetTextSize(text, &font, &text_size, NULL);
65  
66  if (*pImage) cvReleaseImage(pImage);
67  *pImage = cvCreateImage(cvSize(text_size.width+5,text_size.height+10),8,3);
68  cvSet(*pImage,CV_RGB(255,255,255));
69  cvPutText(*pImage,text,cvPoint(2,text_size.height+3),&font, CV_RGB(0,0,0));
70 }
71  
72    CvFont font;
73    CvSize text_size;
74    cvInitFont(&font,CV_FONT_HERSHEY_SIMPLEX ,0.35f,0.35f,0,1,CV_AA);
75  
76    CvFont font;
77    double hscale = 0.2f*_pointSize;
78    cvInitFont(&font,CV_FONT_HERSHEY_TRIPLEX ,hscale,hscale,0,1,CV_AA);
79    
80    CvSize text_size;
81    int baseline;   
82    cvGetTextSize(text, &font, &text_size,&baseline);
83    CvPoint pt;
84    pt.x = point.x - text_size.width/2;
85    pt.y = point.y + (text_size.height+baseline)/2;
86    cvPutText(m_pPlotImage,text,pt,&font, color);
87  
88    CvFont font;
89    double hscale = 0.2f*_pointSize;
90    cvInitFont(&font,CV_FONT_HERSHEY_TRIPLEX ,hscale,hscale,0,1,CV_AA);
91    
92    CvSize text_size;
93    int baseline;   
94    cvGetTextSize(text, &font, &text_size,&baseline);
95    CvPoint pt;
96    pt.x = point.x - text_size.width/2;
97    pt.y = point.y + (text_size.height+baseline)/2;
98    cvPutText(m_pPlotImage,text,pt,&font, color);

主要是cvGetTextSize(text, &font, &text_size, &baseline);
cvPoint(2,text_size.height+baseline)
这样写出的字才对齐得更好些。

转载于:https://www.cnblogs.com/gzy-zju-edu/articles/4178016.html