OpenCV various drawing straight Rectangle circle Ellipse

Drawing functions

(1) Linear cvline function

Its structure

void Cvline (//Draw line
  cvarr* array,//canvas image
  cvpoint pt1,//start point
  cvpoint pt2,//end
  cvscalar color,//color
  int thickness = 1,//width
  int connectivity = 8//anti-aliasing
);

Instance Code

#include <cv.h>
#include 
Output results


(2) Rectangle Cvrectangle function

Its structure

void Cvrectangle (//Draw rectangle
  cvarr* array,//canvas graphics
  cvpoint pt1,//start point cvpoint
  pt2,//end
  cvscalar color,//Color
  int thickness = 1,//width
);
Instance Code
#include <cv.h>
#include 
Output results


(3) Circular cvcircle function

Its structure

void Cvcircle (//Draw circle
  cvarr* array,//canvas image
  cvpoint cevter,//Center
  int radius,//radius
  cvscalar color,//Color
  int thickness = 1,//width
  int connectivity = 8//anti-aliasing
);
Instance Code
#include <cv.h>
#include 
Output results


(4) Elliptic cvellipse function

Its structure

void Cvellipse (//Draw ellipse
  cvarr* img,//canvas image
  cvpoint center,//center point cvsize axes,//Long and short
  axis
  double angle,//deviate from spindle angle
  Double start_angle,//arc start position
  Double end_angle,//arc End position
  cvscalar color,//color
  int thickness = 1,//width
  int line_type = 8//
);
Instance Code
#include <cv.h>
#include 
Output results


(5) Polygon function

1.cvFillPoly function

Its structure

void Cvfillpoly (//Draw multiple solid polygons
  cvarr* img,//canvas image
  cvpoint** pts,//point sequence
  int* npt,//count points array
  int contours,// Display several polygons
  cvscalar color,//color
  int line_type = 8
);
2.cvFillConvexPoly function
Its structure

void Cvfillconvexpoly (//Draw a solid polygon
  cvarr* img,//canvas image
  cvpoint* pts,//point sequence
  int npt,//count points array
  cvscalar color,//color
  int line_type = 8
);
3.cvPolyLine function
void Cvfillpoly (//Draw multiple hollow polygons
  cvarr* img,//canvas image
  cvpoint** pts,//point sequence
  int* npt,//count points array
  int contours,// Shows whether several polygon
  int is_closed,//start from the last polygon end point
  cvscalar color,//color
  int thickness = 1,//width
  int line_type = 8
);
Instance Code
#include <cv.h> #include Output results


(6) Draw text Cvputtext function

Its structure

void Cvputtext (//Draw text
  cvarr* img,//drawing image