实例：图形绘制［OpenCV 笔记15］

DrawShapes.cxx

# include "DrawShapes_utils.h"

#define WINDOW_NAME1 "Painting 1"
#define WINDOW_NAME2 "Painting 2"

// main
int main( void )
{
    // crate Mat image
    cv::Mat atomImage = cv::Mat::zeros(WINDOW_WIDTH, WINDOW_WIDTH, CV_8UC3);
    cv::Mat rookImage = cv::Mat::zeros(WINDOW_WIDTH, WINDOW_WIDTH, CV_8UC3);

    // draw image 1
    // 1) draw ellipses
    DrawEllipse( atomImage, 90 );
    DrawEllipse( atomImage, 0 );
    DrawEllipse( atomImage, 45 );
    DrawEllipse( atomImage, -45 );

    // 2) draw circle
    DrawFilledCircle(atomImage, cv::Point(WINDOW_WIDTH/2, WINDOW_WIDTH/2));

    // draw image 2
    // 1) draw polygon
    DrawPolygon( rookImage );

    // 2) draw rectangle
    cv::rectangle(rookImage,
                  cv::Point(0, 7*WINDOW_WIDTH/8),
                  cv::Point(WINDOW_WIDTH, WINDOW_WIDTH),
                  cv::Scalar( 0, 255, 255),
                  -1,
                  8);
    // 3) draw line segments
    DrawLine(rookImage, cv::Point(0, 15*WINDOW_WIDTH/16), cv::Point(WINDOW_WIDTH, 15*WINDOW_WIDTH/16));
    DrawLine(rookImage, cv::Point(WINDOW_WIDTH/4, 7*WINDOW_WIDTH/8), cv::Point(WINDOW_WIDTH/4, WINDOW_WIDTH));
    DrawLine(rookImage, cv::Point(WINDOW_WIDTH/2, 7*WINDOW_WIDTH/8), cv::Point(WINDOW_WIDTH/2, WINDOW_WIDTH));
    DrawLine(rookImage, cv::Point(3*WINDOW_WIDTH/4, 7*WINDOW_WIDTH/8), cv::Point(3*WINDOW_WIDTH/4, WINDOW_WIDTH));

    // show images
    cv::imshow( WINDOW_NAME1, atomImage );
    cv::moveWindow( WINDOW_NAME1, 0, 200 );
    cv::imshow( WINDOW_NAME2, rookImage );
    cv::moveWindow( WINDOW_NAME2, WINDOW_WIDTH, 200 );

    cv::imwrite("atomImage.jpg", atomImage);
    cv::imwrite("rookImage.jpg", rookImage);

    cv::waitKey(0);

    return 0;
}

DrawShapes_utils.h

#ifndef DRAWSHAPES_H_
#define DRAWSHAPES_H_

#include <opencv2/opencv.hpp>
#include <opencv2/highgui/highgui.hpp>
#define WINDOW_WIDTH 600

// draw ellipse with the same size but different angle
void DrawEllipse( cv::Mat img, double angle );

// draw filled circle
void DrawFilledCircle( cv::Mat img, cv::Point center );

// draw polygon
void DrawPolygon( cv::Mat img );

// draw line
void DrawLine( cv::Mat img, cv::Point start, cv::Point end );

#endif // DRAWSHAPES_H_

DrawShapes_utils.cxx

#include "DrawShapes_utils.h"

// draw ellipse with the same size but different angle
void DrawEllipse( cv::Mat img, double angle )
{
    int thickness = 2;
    int lineType = 8;

    ellipse( img,
             cv::Point( WINDOW_WIDTH/2, WINDOW_WIDTH/2 ),   // center point
             cv::Size(WINDOW_WIDTH/4, WINDOW_WIDTH/16),     // bounding box
             angle,                                         // rotation angle
             0,                                             // arc start from 0 degree
             360,                                           // to 360 degrees
             cv::Scalar(255,129,0),                         // color of the ellipse
             thickness,                                     // line width
             lineType);                                     // line type: 8 neighbor connected line
}

// draw filled circle
void DrawFilledCircle( cv::Mat img, cv::Point center )
{
    int thickness = -1;
    int lineType = 8;

    cv::circle( img,
                center,
                WINDOW_WIDTH/32,         // radius
                cv::Scalar(0, 0, 255),  // color
                thickness,              // line width: -1 filled
                lineType);              // line type
}

// draw polygon
void DrawPolygon( cv::Mat img )
{
    int lineType = 8;

    // create points
    cv::Point rookPoints[1][20];
    rookPoints[0][0] = cv::Point( WINDOW_WIDTH/4, 7*WINDOW_WIDTH/8 );
    rookPoints[0][1] = cv::Point( 3*WINDOW_WIDTH/4, 7*WINDOW_WIDTH/8 );
    rookPoints[0][2] = cv::Point( 3*WINDOW_WIDTH/4, 13*WINDOW_WIDTH/16 );
    rookPoints[0][3] = cv::Point( 11*WINDOW_WIDTH/16, 13*WINDOW_WIDTH/16 );
    rookPoints[0][4] = cv::Point( 19*WINDOW_WIDTH/32, 3*WINDOW_WIDTH/8 );
    rookPoints[0][5] = cv::Point( 3*WINDOW_WIDTH/4, 3*WINDOW_WIDTH/8 );
    rookPoints[0][6] = cv::Point( 3*WINDOW_WIDTH/4, WINDOW_WIDTH/8 );
    rookPoints[0][7] = cv::Point( 26*WINDOW_WIDTH/40, WINDOW_WIDTH/8 );
    rookPoints[0][8] = cv::Point( 26*WINDOW_WIDTH/40, WINDOW_WIDTH/4 );
    rookPoints[0][9] = cv::Point( 22*WINDOW_WIDTH/40, WINDOW_WIDTH/4 );
    rookPoints[0][10] = cv::Point( 22*WINDOW_WIDTH/40, WINDOW_WIDTH/8 );
    rookPoints[0][11] = cv::Point( 18*WINDOW_WIDTH/40, WINDOW_WIDTH/8 );
    rookPoints[0][12] = cv::Point( 18*WINDOW_WIDTH/40, WINDOW_WIDTH/4 );
    rookPoints[0][13] = cv::Point( 14*WINDOW_WIDTH/40, WINDOW_WIDTH/4 );
    rookPoints[0][14] = cv::Point( 14*WINDOW_WIDTH/40, WINDOW_WIDTH/8 );
    rookPoints[0][15] = cv::Point( WINDOW_WIDTH/4, WINDOW_WIDTH/8 );
    rookPoints[0][16] = cv::Point( WINDOW_WIDTH/4, 3*WINDOW_WIDTH/8 );
    rookPoints[0][17] = cv::Point( 13*WINDOW_WIDTH/32, 3*WINDOW_WIDTH/8 );
    rookPoints[0][18] = cv::Point( 5*WINDOW_WIDTH/16, 13*WINDOW_WIDTH/16 );
    rookPoints[0][19] = cv::Point( WINDOW_WIDTH/4, 13*WINDOW_WIDTH/16 );

    const cv::Point* ppt[1] = {rookPoints[0]};
    int npt[] = {20};

    cv::fillPoly( img,
                  ppt,                          // vertices
                  npt,                          // number of vertices
                  1,                            // number of polygon to draw
                  cv::Scalar(255, 255, 255),    //color of polygon
                  lineType);
}

// draw line
void DrawLine( cv::Mat img, cv::Point start, cv::Point end )
{
    int thickness = 2;
    int lineType = 8;
    cv::line( img,
              start,                // start point
              end,                  // end point
              cv::Scalar(0, 0, 0),  // color of line
              thickness,            // line width
              lineType);            // line type
}

CMakeLists.txt

cmake_minimum_required (VERSION 2.8)
project (DrawShapes)

# find OpenCV packages
find_package( OpenCV REQUIRED PATHS /usr/local/Cellar/opencv3/3.1.0_3/share/OpenCV/)
include_directories( ${OpenCV_INCLUDE_DIRS} )

# add the executable
add_executable (DrawShapes DrawShapes.cxx DrawShapes_utils.h DrawShapes_utils.cxx)
target_link_libraries(DrawShapes opencv_core opencv_highgui opencv_imgproc opencv_imgcodecs)

atomImage

rookImage