C++ OpenCV绘制几何图形
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2024-01-02 16:30:34
本文实例为大家分享了c++ opencv绘制几何图形的具体代码，供大家参考，具体内容如下绘制几何图形 直线 矩形 多边形 圆形 椭圆 文字 api直线cv_e...
本文实例为大家分享了c++ opencv绘制几何图形的具体代码，供大家参考，具体内容如下
绘制几何图形
- 直线
- 矩形
- 多边形
- 圆形
- 椭圆
- 文字
api
直线
cv_exports_w void line(inputoutputarray img, point pt1, point pt2, const scalar& color,
int thickness = 1, int linetype = line_8, int shift = 0);
矩形
cv_exports_w void rectangle(inputoutputarray img, point pt1, point pt2,
const scalar& color, int thickness = 1,
int linetype = line_8, int shift = 0);
上方函数通过两点确定矩形的位置和大小，下方函数则是通过矩形对象 rect 来确定。
cv_exports_w void rectangle(inputoutputarray img, rect rec,
const scalar& color, int thickness = 1,
int linetype = line_8, int shift = 0);
多边形
cv_exports void polylines(inputoutputarray img, const point* const* pts, const int* npts,
int ncontours, bool isclosed, const scalar& color,
int thickness = 1, int linetype = line_8, int shift = 0 );
cv_exports_w void polylines(inputoutputarray img, inputarrayofarrays pts,
bool isclosed, const scalar& color,
int thickness = 1, int linetype = line_8, int shift = 0 );
圆形
cv_exports_w void circle(inputoutputarray img, point center, int radius,
const scalar& color, int thickness = 1,
int linetype = line_8, int shift = 0);
椭圆
cv_exports_w void ellipse(inputoutputarray img, const rotatedrect& box, const scalar& color,
int thickness = 1, int linetype = line_8);
cv_exports_w void ellipse(inputoutputarray img, point center, size axes,
double angle, double startangle, double endangle,
const scalar& color, int thickness = 1,
int linetype = line_8, int shift = 0);
文字
cv_exports_w void puttext( inputoutputarray img, const string& text, point org,
int fontface, double fontscale, scalar color,
int thickness = 1, int linetype = line_8,
bool bottomleftorigin = false );
示例
官方示例一
#include <opencv2/core.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/highgui.hpp>
#define w 400
using namespace cv;
void myellipse( mat img, double angle );
void myfilledcircle( mat img, point center );
void mypolygon( mat img );
void myline( mat img, point start, point end );
int main( void ){
char atom_window[] = "drawing 1: atom";
char rook_window[] = "drawing 2: rook";
mat atom_image = mat::zeros( w, w, cv_8uc3 );
mat rook_image = mat::zeros( w, w, cv_8uc3 );
myellipse( atom_image, 90 );
myellipse( atom_image, 0 );
myellipse( atom_image, 45 );
myellipse( atom_image, -45 );
myfilledcircle( atom_image, point( w/2, w/2) );
mypolygon( rook_image );
rectangle( rook_image,
point( 0, 7*w/8 ),
point( w, w),
scalar( 0, 255, 255 ),
filled,
line_8 );
myline( rook_image, point( 0, 15*w/16 ), point( w, 15*w/16 ) );
myline( rook_image, point( w/4, 7*w/8 ), point( w/4, w ) );
myline( rook_image, point( w/2, 7*w/8 ), point( w/2, w ) );
myline( rook_image, point( 3*w/4, 7*w/8 ), point( 3*w/4, w ) );
imshow( atom_window, atom_image );
movewindow( atom_window, 0, 200 );
imshow( rook_window, rook_image );
movewindow( rook_window, w, 200 );
waitkey( 0 );
return(0);
}
void myellipse( mat img, double angle )
{
int thickness = 2;
int linetype = 8;
ellipse( img,
point( w/2, w/2 ),
size( w/4, w/16 ),
angle,
0,
360,
scalar( 255, 0, 0 ),
thickness,
linetype );
}
void myfilledcircle( mat img, point center )
{
circle( img,
center,
w/32,
scalar( 0, 0, 255 ),
filled,
line_8 );
}
void mypolygon( mat img )
{
int linetype = line_8;
point rook_points[1][20];
rook_points[0][0] = point( w/4, 7*w/8 );
rook_points[0][1] = point( 3*w/4, 7*w/8 );
rook_points[0][2] = point( 3*w/4, 13*w/16 );
rook_points[0][3] = point( 11*w/16, 13*w/16 );
rook_points[0][4] = point( 19*w/32, 3*w/8 );
rook_points[0][5] = point( 3*w/4, 3*w/8 );
rook_points[0][6] = point( 3*w/4, w/8 );
rook_points[0][7] = point( 26*w/40, w/8 );
rook_points[0][8] = point( 26*w/40, w/4 );
rook_points[0][9] = point( 22*w/40, w/4 );
rook_points[0][10] = point( 22*w/40, w/8 );
rook_points[0][11] = point( 18*w/40, w/8 );
rook_points[0][12] = point( 18*w/40, w/4 );
rook_points[0][13] = point( 14*w/40, w/4 );
rook_points[0][14] = point( 14*w/40, w/8 );
rook_points[0][15] = point( w/4, w/8 );
rook_points[0][16] = point( w/4, 3*w/8 );
rook_points[0][17] = point( 13*w/32, 3*w/8 );
rook_points[0][18] = point( 5*w/16, 13*w/16 );
rook_points[0][19] = point( w/4, 13*w/16 );
const point* ppt[1] = { rook_points[0] };
int npt[] = { 20 };
fillpoly( img,
ppt,
npt,
1,
scalar( 255, 255, 255 ),
linetype );
}
void myline( mat img, point start, point end )
{
int thickness = 2;
int linetype = line_8;
line( img,
start,
end,
scalar( 0, 0, 0 ),
thickness,
linetype );
}
官方示例二
#include <opencv2/core.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/highgui.hpp>
#include <iostream>
#include <stdio.h>
using namespace cv;
const int number = 100;
const int delay = 5;
const int window_width = 900;
const int window_height = 600;
int x_1 = -window_width/2;
int x_2 = window_width*3/2;
int y_1 = -window_width/2;
int y_2 = window_width*3/2;
static scalar randomcolor( rng& rng );
int drawing_random_lines( mat image, char* window_name, rng rng );
int drawing_random_rectangles( mat image, char* window_name, rng rng );
int drawing_random_ellipses( mat image, char* window_name, rng rng );
int drawing_random_polylines( mat image, char* window_name, rng rng );
int drawing_random_filled_polygons( mat image, char* window_name, rng rng );
int drawing_random_circles( mat image, char* window_name, rng rng );
int displaying_random_text( mat image, char* window_name, rng rng );
int displaying_big_end( mat image, char* window_name, rng rng );
int main( void )
{
int c;
char window_name[] = "drawing_2 tutorial";
rng rng( 0xffffffff );
mat image = mat::zeros( window_height, window_width, cv_8uc3 );
imshow( window_name, image );
waitkey( delay );
c = drawing_random_lines(image, window_name, rng);
if( c != 0 ) return 0;
c = drawing_random_rectangles(image, window_name, rng);
if( c != 0 ) return 0;
c = drawing_random_ellipses( image, window_name, rng );
if( c != 0 ) return 0;
c = drawing_random_polylines( image, window_name, rng );
if( c != 0 ) return 0;
c = drawing_random_filled_polygons( image, window_name, rng );
if( c != 0 ) return 0;
c = drawing_random_circles( image, window_name, rng );
if( c != 0 ) return 0;
c = displaying_random_text( image, window_name, rng );
if( c != 0 ) return 0;
c = displaying_big_end( image, window_name, rng );
if( c != 0 ) return 0;
waitkey(0);
return 0;
}
static scalar randomcolor( rng& rng )
{
int icolor = (unsigned) rng;
return scalar( icolor&255, (icolor>>8)&255, (icolor>>16)&255 );
}
int drawing_random_lines( mat image, char* window_name, rng rng )
{
point pt1, pt2;
for( int i = 0; i < number; i++ )
{
pt1.x = rng.uniform( x_1, x_2 );
pt1.y = rng.uniform( y_1, y_2 );
pt2.x = rng.uniform( x_1, x_2 );
pt2.y = rng.uniform( y_1, y_2 );
line( image, pt1, pt2, randomcolor(rng), rng.uniform(1, 10), 8 );
imshow( window_name, image );
if( waitkey( delay ) >= 0 )
{ return -1; }
}
return 0;
}
int drawing_random_rectangles( mat image, char* window_name, rng rng )
{
point pt1, pt2;
int linetype = 8;
int thickness = rng.uniform( -3, 10 );
for( int i = 0; i < number; i++ )
{
pt1.x = rng.uniform( x_1, x_2 );
pt1.y = rng.uniform( y_1, y_2 );
pt2.x = rng.uniform( x_1, x_2 );
pt2.y = rng.uniform( y_1, y_2 );
rectangle( image, pt1, pt2, randomcolor(rng), max( thickness, -1 ), linetype );
imshow( window_name, image );
if( waitkey( delay ) >= 0 )
{ return -1; }
}
return 0;
}
int drawing_random_ellipses( mat image, char* window_name, rng rng )
{
int linetype = 8;
for ( int i = 0; i < number; i++ )
{
point center;
center.x = rng.uniform(x_1, x_2);
center.y = rng.uniform(y_1, y_2);
size axes;
axes.width = rng.uniform(0, 200);
axes.height = rng.uniform(0, 200);
double angle = rng.uniform(0, 180);
ellipse( image, center, axes, angle, angle - 100, angle + 200,
randomcolor(rng), rng.uniform(-1,9), linetype );
imshow( window_name, image );
if( waitkey(delay) >= 0 )
{ return -1; }
}
return 0;
}
int drawing_random_polylines( mat image, char* window_name, rng rng )
{
int linetype = 8;
for( int i = 0; i< number; i++ )
{
point pt[2][3];
pt[0][0].x = rng.uniform(x_1, x_2);
pt[0][0].y = rng.uniform(y_1, y_2);
pt[0][1].x = rng.uniform(x_1, x_2);
pt[0][1].y = rng.uniform(y_1, y_2);
pt[0][2].x = rng.uniform(x_1, x_2);
pt[0][2].y = rng.uniform(y_1, y_2);
pt[1][0].x = rng.uniform(x_1, x_2);
pt[1][0].y = rng.uniform(y_1, y_2);
pt[1][1].x = rng.uniform(x_1, x_2);
pt[1][1].y = rng.uniform(y_1, y_2);
pt[1][2].x = rng.uniform(x_1, x_2);
pt[1][2].y = rng.uniform(y_1, y_2);
const point* ppt[2] = {pt[0], pt[1]};
int npt[] = {3, 3};
polylines(image, ppt, npt, 2, true, randomcolor(rng), rng.uniform(1,10), linetype);
imshow( window_name, image );
if( waitkey(delay) >= 0 )
{ return -1; }
}
return 0;
}
int drawing_random_filled_polygons( mat image, char* window_name, rng rng )
{
int linetype = 8;
for ( int i = 0; i < number; i++ )
{
point pt[2][3];
pt[0][0].x = rng.uniform(x_1, x_2);
pt[0][0].y = rng.uniform(y_1, y_2);
pt[0][1].x = rng.uniform(x_1, x_2);
pt[0][1].y = rng.uniform(y_1, y_2);
pt[0][2].x = rng.uniform(x_1, x_2);
pt[0][2].y = rng.uniform(y_1, y_2);
pt[1][0].x = rng.uniform(x_1, x_2);
pt[1][0].y = rng.uniform(y_1, y_2);
pt[1][1].x = rng.uniform(x_1, x_2);
pt[1][1].y = rng.uniform(y_1, y_2);
pt[1][2].x = rng.uniform(x_1, x_2);
pt[1][2].y = rng.uniform(y_1, y_2);
const point* ppt[2] = {pt[0], pt[1]};
int npt[] = {3, 3};
fillpoly( image, ppt, npt, 2, randomcolor(rng), linetype );
imshow( window_name, image );
if( waitkey(delay) >= 0 )
{ return -1; }
}
return 0;
}
int drawing_random_circles( mat image, char* window_name, rng rng )
{
int linetype = 8;
for (int i = 0; i < number; i++)
{
point center;
center.x = rng.uniform(x_1, x_2);
center.y = rng.uniform(y_1, y_2);
circle( image, center, rng.uniform(0, 300), randomcolor(rng),
rng.uniform(-1, 9), linetype );
imshow( window_name, image );
if( waitkey(delay) >= 0 )
{ return -1; }
}
return 0;
}
int displaying_random_text( mat image, char* window_name, rng rng )
{
int linetype = 8;
for ( int i = 1; i < number; i++ )
{
point org;
org.x = rng.uniform(x_1, x_2);
org.y = rng.uniform(y_1, y_2);
puttext( image, "testing text rendering", org, rng.uniform(0,8),
rng.uniform(0,100)*0.05+0.1, randomcolor(rng), rng.uniform(1, 10), linetype);
imshow( window_name, image );
if( waitkey(delay) >= 0 )
{ return -1; }
}
return 0;
}
int displaying_big_end( mat image, char* window_name, rng )
{
size textsize = gettextsize("opencv forever!", font_hershey_complex, 3, 5, 0);
point org((window_width - textsize.width)/2, (window_height - textsize.height)/2);
int linetype = 8;
mat image2;
for( int i = 0; i < 255; i += 2 )
{
image2 = image - scalar::all(i);
puttext( image2, "opencv forever!", org, font_hershey_complex, 3,
scalar(i, i, 255), 5, linetype );
imshow( window_name, image2 );
if( waitkey(delay) >= 0 )
{ return -1; }
}
return 0;
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
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