converted some OpenCV C samples to C++

samples/cpp/drawing.cpp

@@ -0,0 +1,174 @@
+#include <opencv2/core/core.hpp>
+#include <opencv2/highgui/highgui.hpp>
+
+using namespace cv;
+
+static Scalar randomColor(RNG& rng)
+{
+    int icolor = (unsigned)rng;
+    return Scalar(icolor&255, (icolor>>8)&255, (icolor>>16)&255);
+}
+
+int main( int argc, char** argv )
+{
+    char wndname[] = "Drawing Demo";
+    const int NUMBER = 100;
+    const int DELAY = 5;
+    int lineType = CV_AA; // change it to 8 to see non-antialiased graphics
+    int i, width = 1000, height = 700;
+    int x1 = -width/2, x2 = width*3/2, y1 = -height/2, y2 = height*3/2;
+    RNG rng(-1);
+
+    Mat image = Mat::zeros(height, width, CV_8UC3);
+    imshow(wndname, image);
+    waitKey(DELAY);
+
+    for (i = 0; i < NUMBER; i++)
+    {
+        Point pt1, pt2;
+        pt1.x = rng.uniform(x1, x2);
+        pt1.y = rng.uniform(y1, y2);
+        pt2.x = rng.uniform(x1, x2);
+        pt2.y = rng.uniform(y1, y2);
+
+        line( image, pt1, pt2, randomColor(rng), rng.uniform(1,10), lineType );
+        
+        imshow(wndname, image);
+        if(waitKey(DELAY) >= 0)
+            return 0;
+    }
+
+    for (i = 0; i < NUMBER; i++)
+    {
+        Point pt1, pt2;
+        pt1.x = rng.uniform(x1, x2);
+        pt1.y = rng.uniform(y1, y2);
+        pt2.x = rng.uniform(x1, x2);
+        pt2.y = rng.uniform(y1, y2);
+        int thickness = rng.uniform(-3, 10);
+        
+        rectangle( image, pt1, pt2, randomColor(rng), MAX(thickness, -1), lineType );
+        
+        imshow(wndname, image);
+        if(waitKey(DELAY) >= 0)
+            return 0;
+    }
+    
+    for (i = 0; i < NUMBER; i++)
+    {
+        Point center;
+        center.x = rng.uniform(x1, x2);
+        center.y = rng.uniform(y1, y2);
+        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(wndname, image);
+        if(waitKey(DELAY) >= 0)
+            return 0;
+    }
+
+    for (i = 0; i< NUMBER; i++)
+    {
+        Point pt[2][3];
+        pt[0][0].x = rng.uniform(x1, x2);
+        pt[0][0].y = rng.uniform(y1, y2);
+        pt[0][1].x = rng.uniform(x1, x2); 
+        pt[0][1].y = rng.uniform(y1, y2); 
+        pt[0][2].x = rng.uniform(x1, x2);
+        pt[0][2].y = rng.uniform(y1, y2);
+        pt[1][0].x = rng.uniform(x1, x2); 
+        pt[1][0].y = rng.uniform(y1, y2);
+        pt[1][1].x = rng.uniform(x1, x2); 
+        pt[1][1].y = rng.uniform(y1, y2);
+        pt[1][2].x = rng.uniform(x1, x2); 
+        pt[1][2].y = rng.uniform(y1, y2);
+        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(wndname, image);
+        if(waitKey(DELAY) >= 0)
+            return 0;
+    }
+    
+    for (i = 0; i< NUMBER; i++)
+    {
+        Point pt[2][3];
+        pt[0][0].x = rng.uniform(x1, x2);
+        pt[0][0].y = rng.uniform(y1, y2);
+        pt[0][1].x = rng.uniform(x1, x2); 
+        pt[0][1].y = rng.uniform(y1, y2); 
+        pt[0][2].x = rng.uniform(x1, x2);
+        pt[0][2].y = rng.uniform(y1, y2);
+        pt[1][0].x = rng.uniform(x1, x2); 
+        pt[1][0].y = rng.uniform(y1, y2);
+        pt[1][1].x = rng.uniform(x1, x2); 
+        pt[1][1].y = rng.uniform(y1, y2);
+        pt[1][2].x = rng.uniform(x1, x2); 
+        pt[1][2].y = rng.uniform(y1, y2);
+        const Point* ppt[2] = {pt[0], pt[1]};
+        int npt[] = {3, 3};
+        
+        fillPoly(image, ppt, npt, 2, randomColor(rng), lineType);
+        
+        imshow(wndname, image);
+        if(waitKey(DELAY) >= 0)
+            return 0;
+    }
+
+    for (i = 0; i < NUMBER; i++)
+    {
+        Point center;
+        center.x = rng.uniform(x1, x2);
+        center.y = rng.uniform(y1, y2);
+        
+        circle(image, center, rng.uniform(0, 300), randomColor(rng),
+               rng.uniform(-1, 9), lineType);
+        
+        imshow(wndname, image);
+        if(waitKey(DELAY) >= 0)
+            return 0;
+    }
+
+    for (i = 1; i < NUMBER; i++)
+    {
+        Point org;
+        org.x = rng.uniform(x1, x2);
+        org.y = rng.uniform(y1, y2);
+
+        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(wndname, image);
+        if(waitKey(DELAY) >= 0)
+            return 0;
+    }
+
+    Size textsize = getTextSize("OpenCV forever!", CV_FONT_HERSHEY_COMPLEX, 3, 5, 0);
+    Point org((width - textsize.width)/2, (height - textsize.height)/2);
+    
+    Mat image2;
+    for( 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(wndname, image2);
+        if(waitKey(DELAY) >= 0)
+            return 0;
+    }
+
+    waitKey();
+    return 0;
+}
+
+#ifdef _EiC
+main(1,"drawing.c");
+#endif