[OpenCV] Samples 01: Geometry - 几何图形
前言
基本的几何图形,标注功能。
commondLineParser的使用参见:http://blog.csdn.net/u010305560/article/details/8941365
#include "opencv2/core.hpp"
#include "opencv2/imgproc.hpp"
#include "opencv2/highgui.hpp"
#include <stdio.h>
#include <iostream>
using namespace cv; static void help()
{
printf("\nThis program demonstrates OpenCV drawing and text output functions.\n"
"Usage:\n"
" ./drawing\n");
} //Jeff --> Specific structure for colour.
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)
{
cv::CommandLineParser parser(argc, argv, "{help h||}");
if (parser.has("help"))
{
help();
return 0;
} char wndname[] = "Drawing Demo";
const int NUMBER = 100;
const int DELAY = 5;
int lineType = LINE_AA; // change it to LINE_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; //Jeff --> one kind of random number generator with specific distribution.
RNG rng(0xFFFFFFFF); // (1) Show a black background picture.
Mat image = Mat::zeros(height, width, CV_8UC3);
imshow(wndname, image);
waitKey(DELAY); // (2) Draw several lines between points.
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;
} // (3) Draw rectangle.
for (i = 0; i < NUMBER; i++)
{
//Jeff --> This are two diagonal corners.
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;
} // (4) Draw ellipse.
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); //Jeff --> set angle because this is not a complete circle.
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;
} // (5) Draw polylines.
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;
} // (6) Draw polylines with filled body.
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;
} // (7) Draw circle.
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;
} // (8) Draw Text.
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); // (9) Foreground picture disappears.
Mat image2;
for( i = 0; i < 255; i += 2 )
{
// Jeff --> step one, erase forecolor.
image2 = image - Scalar::all(i); // Jeff --> step two, show text.
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
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