4.opencv之画图2

程序来源：F:\opencv\opencv\samples\cpp\tutorial_code\core\Matrix

程序：

/** * @file Drawing_2.cpp * @brief Simple sample code */#include <opencv2/core/core.hpp>#include <opencv2/highgui/highgui.hpp>#include <iostream>#include <stdio.h>using namespace cv;/// Global Variablesconst 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;/// Function headersstatic 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 );/** * @function main */int main( int argc, char** argv ){  int c;  /// Start creating a window  char window_name[] = "Drawing_2 Tutorial";  /// Also create a random object (RNG)  RNG rng( 0xFFFFFFFF );  /// Initialize a matrix filled with zeros  Mat image = Mat::zeros( window_height, window_width, CV_8UC3 );  /// Show it in a window during DELAY ms  imshow( window_name, image );  waitKey( DELAY );  /// Now, let's draw some lines  c = Drawing_Random_Lines(image, window_name, rng);  if( c != 0 ) return 0;  /// Go on drawing, this time nice rectangles  c = Drawing_Random_Rectangles(image, window_name, rng);  if( c != 0 ) return 0;  /// Draw some ellipses  c = Drawing_Random_Ellipses( image, window_name, rng );  if( c != 0 ) return 0;  /// Now some polylines  c = Drawing_Random_Polylines( image, window_name, rng );  if( c != 0 ) return 0;  /// Draw filled polygons  c = Drawing_Random_Filled_Polygons( image, window_name, rng );  if( c != 0 ) return 0;  /// Draw circles  c = Drawing_Random_Circles( image, window_name, rng );  if( c != 0 ) return 0;  /// Display text in random positions  c = Displaying_Random_Text( image, window_name, rng );  if( c != 0 ) return 0;  /// Displaying the big end!  c = Displaying_Big_End( image, window_name, rng );  if( c != 0 ) return 0;  waitKey(0);  return 0;}/// Function definitions/** * @function randomColor * @brief Produces a random color given a random object */static Scalar randomColor( RNG& rng ){  int icolor = (unsigned) rng;  return Scalar( icolor&255, (icolor>>8)&255, (icolor>>16)&255 );}/** * @function Drawing_Random_Lines */int Drawing_Random_Lines( Mat image, char* window_name, RNG rng ){  int lineType = 8;  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;}/** * @function Drawing_Rectangles */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;}/** * @function Drawing_Random_Ellipses */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;}/** * @function Drawing_Random_Polylines */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;}/** * @function Drawing_Random_Filled_Polygons */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;}/** * @function Drawing_Random_Circles */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;}/** * @function Displaying_Random_Text */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;}/** * @function Displaying_Big_End */int Displaying_Big_End( Mat image, char* window_name, RNG rng ){  Size textsize = getTextSize("OpenCV forever!", CV_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, CV_FONT_HERSHEY_COMPLEX, 3,             Scalar(i, i, 255), 5, lineType );    imshow( window_name, image2 );    if( waitKey(DELAY) >= 0 )       { return -1; }  }  return 0;}

运行结果及解释见：

http://www.opencv.org.cn/opencvdoc/2.3.2/html/doc/tutorials/core/random_generator_and_text/random_generator_and_text.html