随机数发生器&绘制文字---opencv2.4.11

来源：互联网发布：linux 设置北京时间编辑：程序博客网时间：2024/06/05 20:18

摘自opencv官方例程：随机数发生器&绘制文字---opencv2.4.11

(opencv\sources\samples\cpp\drawing.cpp)

#include "opencv2/core/core.hpp"

#include "opencv2/highgui/highgui.hpp"
#include <stdio.h>
using namespace cv;

static void help()
{
printf("\nThis program demonstrates OpenCV drawing and text output functions.\n"
"Usage:\n"
" ./drawing\n");
}
static Scalar randomColor(RNG& rng)
{
int icolor = (unsigned)rng;
return Scalar(icolor&255, (icolor>>8)&255, (icolor>>16)&255);
}

int main()
{
help();
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(0xFFFFFFFF);

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!", 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, 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

0 0