1 /** 2 * @file Drawing_2.cpp 3 * @brief Simple sample code 4 */ 5 6 #include <opencv2/core.hpp> 7 #include <opencv2/imgproc.hpp> 8 #include <opencv2/highgui.hpp> 9 #include <iostream> 10 #include <stdio.h> 11 12 using namespace cv; 13 14 /// Global Variables 15 const int NUMBER = 100; 16 const int DELAY = 5; 17 18 const int window_width = 900; 19 const int window_height = 600; 20 int x_1 = -window_width/2; 21 int x_2 = window_width*3/2; 22 int y_1 = -window_width/2; 23 int y_2 = window_width*3/2; 24 25 /// Function headers 26 static Scalar randomColor( RNG& rng ); 27 int Drawing_Random_Lines( Mat image, char* window_name, RNG rng ); 28 int Drawing_Random_Rectangles( Mat image, char* window_name, RNG rng ); 29 int Drawing_Random_Ellipses( Mat image, char* window_name, RNG rng ); 30 int Drawing_Random_Polylines( Mat image, char* window_name, RNG rng ); 31 int Drawing_Random_Filled_Polygons( Mat image, char* window_name, RNG rng ); 32 int Drawing_Random_Circles( Mat image, char* window_name, RNG rng ); 33 int Displaying_Random_Text( Mat image, char* window_name, RNG rng ); 34 int Displaying_Big_End( Mat image, char* window_name, RNG rng ); 35 36 37 /** 38 * @function main 39 */ 40 int main( void ) 41 { 42 int c; 43 44 /// Start creating a window 45 char window_name[] = "Drawing_2 Tutorial"; 46 47 /// Also create a random object (RNG) 48 RNG rng( 0xFFFFFFFF ); 49 50 /// Initialize a matrix filled with zeros 51 Mat image = Mat::zeros( window_height, window_width, CV_8UC3 ); 52 /// Show it in a window during DELAY ms 53 imshow( window_name, image ); 54 waitKey( DELAY ); 55 56 /// Now, let's draw some lines 57 c = Drawing_Random_Lines(image, window_name, rng); 58 if( c != 0 ) return 0; 59 60 /// Go on drawing, this time nice rectangles 61 c = Drawing_Random_Rectangles(image, window_name, rng); 62 if( c != 0 ) return 0; 63 64 /// Draw some ellipses 65 c = Drawing_Random_Ellipses( image, window_name, rng ); 66 if( c != 0 ) return 0; 67 68 /// Now some polylines 69 c = Drawing_Random_Polylines( image, window_name, rng ); 70 if( c != 0 ) return 0; 71 72 /// Draw filled polygons 73 c = Drawing_Random_Filled_Polygons( image, window_name, rng ); 74 if( c != 0 ) return 0; 75 76 /// Draw circles 77 c = Drawing_Random_Circles( image, window_name, rng ); 78 if( c != 0 ) return 0; 79 80 /// Display text in random positions 81 c = Displaying_Random_Text( image, window_name, rng ); 82 if( c != 0 ) return 0; 83 84 /// Displaying the big end! 85 c = Displaying_Big_End( image, window_name, rng ); 86 if( c != 0 ) return 0; 87 88 waitKey(0); 89 return 0; 90 } 91 92 /// Function definitions 93 94 /** 95 * @function randomColor 96 * @brief Produces a random color given a random object 97 */ 98 static Scalar randomColor( RNG& rng ) 99 { 100 int icolor = (unsigned) rng; 101 return Scalar( icolor&255, (icolor>>8)&255, (icolor>>16)&255 ); 102 } 103 104 105 /** 106 * @function Drawing_Random_Lines 107 */ 108 int Drawing_Random_Lines( Mat image, char* window_name, RNG rng ) 109 { 110 Point pt1, pt2; 111 112 for( int i = 0; i < NUMBER; i++ ) 113 { 114 pt1.x = rng.uniform( x_1, x_2 ); 115 pt1.y = rng.uniform( y_1, y_2 ); 116 pt2.x = rng.uniform( x_1, x_2 ); 117 pt2.y = rng.uniform( y_1, y_2 ); 118 119 line( image, pt1, pt2, randomColor(rng), rng.uniform(1, 10), 8 ); 120 imshow( window_name, image ); 121 if( waitKey( DELAY ) >= 0 ) 122 { return -1; } 123 } 124 125 return 0; 126 } 127 128 /** 129 * @function Drawing_Rectangles 130 */ 131 int Drawing_Random_Rectangles( Mat image, char* window_name, RNG rng ) 132 { 133 Point pt1, pt2; 134 int lineType = 8; 135 int thickness = rng.uniform( -3, 10 ); 136 137 for( int i = 0; i < NUMBER; i++ ) 138 { 139 pt1.x = rng.uniform( x_1, x_2 ); 140 pt1.y = rng.uniform( y_1, y_2 ); 141 pt2.x = rng.uniform( x_1, x_2 ); 142 pt2.y = rng.uniform( y_1, y_2 ); 143 144 rectangle( image, pt1, pt2, randomColor(rng), MAX( thickness, -1 ), lineType ); 145 146 imshow( window_name, image ); 147 if( waitKey( DELAY ) >= 0 ) 148 { return -1; } 149 } 150 151 return 0; 152 } 153 154 /** 155 * @function Drawing_Random_Ellipses 156 */ 157 int Drawing_Random_Ellipses( Mat image, char* window_name, RNG rng ) 158 { 159 int lineType = 8; 160 161 for ( int i = 0; i < NUMBER; i++ ) 162 { 163 Point center; 164 center.x = rng.uniform(x_1, x_2); 165 center.y = rng.uniform(y_1, y_2); 166 167 Size axes; 168 axes.width = rng.uniform(0, 200); 169 axes.height = rng.uniform(0, 200); 170 171 double angle = rng.uniform(0, 180); 172 173 ellipse( image, center, axes, angle, angle - 100, angle + 200, 174 randomColor(rng), rng.uniform(-1,9), lineType ); 175 176 imshow( window_name, image ); 177 178 if( waitKey(DELAY) >= 0 ) 179 { return -1; } 180 } 181 182 return 0; 183 } 184 185 /** 186 * @function Drawing_Random_Polylines 187 */ 188 int Drawing_Random_Polylines( Mat image, char* window_name, RNG rng ) 189 { 190 int lineType = 8; 191 192 for( int i = 0; i< NUMBER; i++ ) 193 { 194 Point pt[2][3]; 195 pt[0][0].x = rng.uniform(x_1, x_2); 196 pt[0][0].y = rng.uniform(y_1, y_2); 197 pt[0][1].x = rng.uniform(x_1, x_2); 198 pt[0][1].y = rng.uniform(y_1, y_2); 199 pt[0][2].x = rng.uniform(x_1, x_2); 200 pt[0][2].y = rng.uniform(y_1, y_2); 201 pt[1][0].x = rng.uniform(x_1, x_2); 202 pt[1][0].y = rng.uniform(y_1, y_2); 203 pt[1][1].x = rng.uniform(x_1, x_2); 204 pt[1][1].y = rng.uniform(y_1, y_2); 205 pt[1][2].x = rng.uniform(x_1, x_2); 206 pt[1][2].y = rng.uniform(y_1, y_2); 207 208 const Point* ppt[2] = {pt[0], pt[1]}; 209 int npt[] = {3, 3}; 210 211 polylines(image, ppt, npt, 2, true, randomColor(rng), rng.uniform(1,10), lineType); 212 213 imshow( window_name, image ); 214 if( waitKey(DELAY) >= 0 ) 215 { return -1; } 216 } 217 return 0; 218 } 219 220 /** 221 * @function Drawing_Random_Filled_Polygons 222 */ 223 int Drawing_Random_Filled_Polygons( Mat image, char* window_name, RNG rng ) 224 { 225 int lineType = 8; 226 227 for ( int i = 0; i < NUMBER; i++ ) 228 { 229 Point pt[2][3]; 230 pt[0][0].x = rng.uniform(x_1, x_2); 231 pt[0][0].y = rng.uniform(y_1, y_2); 232 pt[0][1].x = rng.uniform(x_1, x_2); 233 pt[0][1].y = rng.uniform(y_1, y_2); 234 pt[0][2].x = rng.uniform(x_1, x_2); 235 pt[0][2].y = rng.uniform(y_1, y_2); 236 pt[1][0].x = rng.uniform(x_1, x_2); 237 pt[1][0].y = rng.uniform(y_1, y_2); 238 pt[1][1].x = rng.uniform(x_1, x_2); 239 pt[1][1].y = rng.uniform(y_1, y_2); 240 pt[1][2].x = rng.uniform(x_1, x_2); 241 pt[1][2].y = rng.uniform(y_1, y_2); 242 243 const Point* ppt[2] = {pt[0], pt[1]}; 244 int npt[] = {3, 3}; 245 246 fillPoly( image, ppt, npt, 2, randomColor(rng), lineType ); 247 248 imshow( window_name, image ); 249 if( waitKey(DELAY) >= 0 ) 250 { return -1; } 251 } 252 return 0; 253 } 254 255 /** 256 * @function Drawing_Random_Circles 257 */ 258 int Drawing_Random_Circles( Mat image, char* window_name, RNG rng ) 259 { 260 int lineType = 8; 261 262 for (int i = 0; i < NUMBER; i++) 263 { 264 Point center; 265 center.x = rng.uniform(x_1, x_2); 266 center.y = rng.uniform(y_1, y_2); 267 268 circle( image, center, rng.uniform(0, 300), randomColor(rng), 269 rng.uniform(-1, 9), lineType ); 270 271 imshow( window_name, image ); 272 if( waitKey(DELAY) >= 0 ) 273 { return -1; } 274 } 275 276 return 0; 277 } 278 279 /** 280 * @function Displaying_Random_Text 281 */ 282 int Displaying_Random_Text( Mat image, char* window_name, RNG rng ) 283 { 284 int lineType = 8; 285 286 for ( int i = 1; i < NUMBER; i++ ) 287 { 288 Point org; 289 org.x = rng.uniform(x_1, x_2); 290 org.y = rng.uniform(y_1, y_2); 291 292 putText( image, "Testing text rendering", org, rng.uniform(0,8), 293 rng.uniform(0,100)*0.05+0.1, randomColor(rng), rng.uniform(1, 10), lineType); 294 295 imshow( window_name, image ); 296 if( waitKey(DELAY) >= 0 ) 297 { return -1; } 298 } 299 300 return 0; 301 } 302 303 /** 304 * @function Displaying_Big_End 305 */ 306 int Displaying_Big_End( Mat image, char* window_name, RNG ) 307 { 308 Size textsize = getTextSize("OpenCV forever!", FONT_HERSHEY_COMPLEX, 3, 5, 0); 309 Point org((window_width - textsize.width)/2, (window_height - textsize.height)/2); 310 int lineType = 8; 311 312 Mat image2; 313 314 for( int i = 0; i < 255; i += 2 ) 315 { 316 image2 = image - Scalar::all(i); 317 putText( image2, "OpenCV forever!", org, FONT_HERSHEY_COMPLEX, 3, 318 Scalar(i, i, 255), 5, lineType ); 319 320 imshow( window_name, image2 ); 321 if( waitKey(DELAY) >= 0 ) 322 { return -1; } 323 } 324 325 return 0; 326 } 327
