opencv 3.0 绘图 highgui

绘图的时候最常用的是highgui

需注意的是：绘图填充 需要赋值thickness 

thickness – 绘图边框的粗细. 负值（CV_FILLED = -1）

相关函数介绍

Point

该数据结构表示了由其图像坐标 和 指定的2D点。可定义为：

Point pt;

pt.x = 10;

pt.y = 8;

或者

Point pt = Point(10, 8);

Scalar

表示了具有4个元素的数组。次类型在OpenCV中被大量用于传递像素值。

本节中，我们将进一步用它来表示RGB颜色值（三个参数）。如果用不到第四个参数，则无需定义。

我们来看个例子，如果给出以下颜色参数表达式：

Scalar( a, b, c )

那么定义的RGB颜色值为：Red = c, Green = b and Blue= a

Rectangle

C++: void rectangle(Mat& img,Point pt1, Pointpt2, const Scalar&color, intthickness=1,intlineType=8, intshift=0)

C++: void rectangle(Mat& img,Rect rec, const Scalar&color, intthickness=1, intlineType=8,intshift=0 )

Parameters:

• img – 画矩形的对象
• pt1 – 矩形的一个顶点，左上角的.
• pt2 – 另一个顶点，右下角的.
• rec – 确定矩形的另一种方式，给左上角坐标和长宽
• color – 指定矩形的颜色或亮度(灰度图像)，scalar(255,0,255)既可指定.
• thickness – 矩形边框的粗细. 负值（like CV_FILLED）表示要画一个填充的矩形
• lineType – 边框线型. （   

8 (or 0) - 8-connected line（8邻接)连接 线。

4 - 4-connected line(4邻接)连接线。

CV_AA - antialiased 线条。）

• shift –坐标点的小数点位数

Line

C++: void line(Mat& img, Point pt1,Point pt2, const Scalar& color, int thickness=1, int lineType=8,int shift=0)

Parameters:

• img – 图像.
• pt1 – 线条起点.
• pt2 – 线条终点.
• color – 线条颜色.
• thickness – 线条宽度.
• lineType – 线型

Type of the line:

• 8 (or omitted) - 8-connected line.
• 4 - 4-connected line.
• CV_AA - antialiased line.
• shift – 坐标点小数点位数.

Circle

C++: void circle(Mat&img, Point center, intradius, const Scalar&color,intthickness=1, intlineType=8, intshift=0)

Parameters:

• img – 要画圆的那个矩形.
• center – 圆心坐标.
• radius – 半径.
• color – 圆边框颜色，scalar类型的
• thickness – 正值表示圆边框宽度. 负值表示画一个填充圆形
• lineType – 圆边框线型
• shift – 圆心坐标和半径的小数点位数

Ellipse

C++: void ellipse(Mat& img, Point center,Size axes, double angle, double startAngle, double endAngle, const Scalar& color,int thickness=1, int lineType=8, int shift=0)

C++: void ellipse(Mat& img, constRotatedRect& box, const Scalar& color, int thickness=1, int lineType=8)

Parameters:

• img – 椭圆所在图像.
• center – 椭圆中心.
• axes – 椭圆主轴一半的长度
• angle – 椭圆旋转角度
• startAngle – 椭圆弧起始角度
• endAngle –椭圆弧终止角度
• box – 指定椭圆中心和旋转角度的信息，通过 RotatedRect 或 CvBox2D. 这表示椭圆画在旋转矩形上（矩形是不可见的，只是指定了一个框而已）
• color – 椭圆边框颜色.
• thickness – 正值代表椭圆边框宽度，负值代表填充的椭圆
• lineType – 线型
• shift – 椭圆中心坐标和坐标轴的小数点位数

PolyLine

C++: void polylines(Mat& img, const Point** pts, const int* npts, int ncontours, bool isClosed, const Scalar& color, int thickness=1, int lineType=8, int shift=0 )

C++: void polylines(InputOutputArray img, InputArrayOfArrays pts, bool isClosed, const Scalar& color, int thickness=1, int lineType=8, int shift=0 )

Parameters:

• img – 折线所在图像.
• pts – 折线中拐点坐标指针.
• npts – 折线拐点个数指针.
• ncontours – 折线线段数量.
• isClosed – 折线是否闭合.
• color – 折线颜色.
• thickness – 折线宽度.
• lineType – 线型.
• shift – 顶点坐标小数点位数.

PutText

C++: void putText(Mat& img, const string& text, Point org, int fontFace, double fontScale, Scalar color, int thickness=1, int lineType=8, bool bottomLeftOrigin=false )

Parameters:

• img – 显示文字所在图像.
• text – 待显示的文字.
• org – 文字在图像中的左下角 坐标.
• font – 字体结构体.
• fontFace – 字体类型， 可选择字体：FONT_HERSHEY_SIMPLEX, FONT_HERSHEY_PLAIN, FONT_HERSHEY_DUPLEX,FONT_HERSHEY_COMPLEX, FONT_HERSHEY_TRIPLEX, FONT_HERSHEY_COMPLEX_SMALL, FONT_HERSHEY_SCRIPT_SIMPLEX, orFONT_HERSHEY_SCRIPT_COMPLEX,以上所有类型都可以配合 FONT_HERSHEY_ITALIC使用，产生斜体效果。
• fontScale – 字体大小，该值和字体内置大小相乘得到字体大小
• color – 文本颜色
• thickness –  写字的线的粗细，类似于0.38的笔尖和0.5的笔尖
• lineType – 线性.
• bottomLeftOrigin – true, 图像数据原点在左下角. Otherwise, 图像数据原点在左上角.

示例代码

/** * @file Drawing_1.cpp * @brief Simple sample code */#include <opencv2/core/core.hpp>#include <opencv2/highgui/highgui.hpp>#define w 400using namespace cv;/// Function headersvoid MyEllipse( Mat img, double angle );void MyFilledCircle( Mat img, Point center );void MyPolygon( Mat img );void MyLine( Mat img, Point start, Point end );/** * @function main * @brief Main function */int main( void ){  /// Windows names  char atom_window[] = "Drawing 1: Atom";  char rook_window[] = "Drawing 2: Rook";  /// Create black empty images  Mat atom_image = Mat::zeros( w, w, CV_8UC3 );  Mat rook_image = Mat::zeros( w, w, CV_8UC3 );  /// 1. Draw a simple atom:  /// -----------------------  /// 1.a. Creating ellipses  MyEllipse( atom_image, 90 );  MyEllipse( atom_image, 0 );  MyEllipse( atom_image, 45 );  MyEllipse( atom_image, -45 );  /// 1.b. Creating circles  MyFilledCircle( atom_image, Point( w/2, w/2) );  /// 2. Draw a rook  /// ------------------  /// 2.a. Create a convex polygon  MyPolygon( rook_image );  /// 2.b. Creating rectangles  rectangle( rook_image,         Point( 0, 7*w/8 ),         Point( w, w),         Scalar( 0, 255, 255 ),         -1,         8 );  RotatedRect rRect = RotatedRect(Point2f(100,100), Size2f(100,50), 30);  ellipse(rook_image, rRect, Scalar(255,255,0));  /// 2.c. Create a few lines  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 ) );  /// 3. Display your stuff!  imshow( atom_window, atom_image );  moveWindow( atom_window, 0, 200 );  imshow( rook_window, rook_image );  moveWindow( rook_window, w, 200 );  waitKey( 0 );  return(0);}/// Function Declaration/** * @function MyEllipse * @brief Draw a fixed-size ellipse with different angles */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 );}/** * @function MyFilledCircle * @brief Draw a fixed-size filled circle */void MyFilledCircle( Mat img, Point center ){  int thickness = -1;  int lineType = 8;  circle( img,      center,      w/32,      Scalar( 0, 0, 255 ),      thickness,      lineType );}/** * @function MyPolygon * @function Draw a simple concave polygon (rook) */void MyPolygon( Mat img ){  int lineType = 8;  /** Create some points */  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 );}/** * @function MyLine * @brief Draw a simple line */void MyLine( Mat img, Point start, Point end ){  int thickness = 2;  int lineType = 8;  line( img,    start,    end,    Scalar( 0, 0, 0 ),    thickness,    lineType );}

实验结果

转自

http://blog.csdn.net/ubunfans/article/details/24421981