// 繪制圓端矩形（藥丸狀，pill）
void DrawPill(cv::Mat mask, const cv::RotatedRect rotatedrect, const cv::Scalar color, int thickness, int lineType)
{
cv::Mat canvas = cv::Mat::zeros(mask.size(), CV_8UC1);
// 確定短邊，短邊繪制圓形
cv::RotatedRect rect = rotatedrect;
float r = rect.size.height / 2.0f;
if (rect.size.width > rect.size.height) {
rect.size.width -= rect.size.height;
}
else {
rect.size.height -= rect.size.width;
r = rect.size.width / 2.0f;
}
cv::Point2f ps[4];
rect.points(ps);
// 繪制邊緣
std::vectorstd::vectorcv::Point>> tmpContours;
std::vectorcv::Point> contours;
for (int i = 0; i != 4; ++i) {
contours.emplace_back(cv::Point2i(ps[i]));
}
tmpContours.insert(tmpContours.end(), contours);
drawContours(canvas, tmpContours, 0, cv::Scalar(255),5, lineType); // 填充mask
// 計算常長短軸
float a = rotatedrect.size.width;
float b = rotatedrect.size.height;
int point01_x = (int)((ps[0].x + ps[1].x) / 2.0f);
int point01_y = (int)((ps[0].y + ps[1].y) / 2.0f);
int point03_x = (int)((ps[0].x + ps[3].x) / 2.0f);
int point03_y = (int)((ps[0].y + ps[3].y) / 2.0f);
int point12_x = (int)((ps[1].x + ps[2].x) / 2.0f);
int point12_y = (int)((ps[1].y + ps[2].y) / 2.0f);
int point23_x = (int)((ps[2].x + ps[3].x) / 2.0f);
int point23_y = (int)((ps[2].y + ps[3].y) / 2.0f);
cv::Point c0 = a b ? cv::Point(point12_x, point12_y) : cv::Point(point23_x, point23_y);
cv::Point c1 = a b ? cv::Point(point03_x, point03_y) : cv::Point(point01_x, point01_y);
// 長軸兩端以填充的方式畫圓，直徑等于短軸
cv::circle(canvas, c0, (int)r, cv::Scalar(255), 5, lineType);
cv::circle(canvas, c1, (int)r, cv::Scalar(255), 5, lineType);
// 繪制外圍輪廓，如果不這樣操作，會得到一個矩形加兩個圓形，丑。。。
std::vectorstd::vectorcv::Point>> EXcontours;
cv::findContours(canvas,EXcontours,cv::RETR_EXTERNAL, CHAIN_APPROX_SIMPLE);
drawContours(mask, EXcontours, 0, color, thickness,lineType); // 填充mask
}
#include iostream>
#include opencv2/opencv.hpp>
using namespace std;
using namespace cv;
void DrawPill(cv::Mat mask, const cv::RotatedRect rotatedrect, const cv::Scalar color, int thickness, int lineType);
int main()
{
cv::Mat src = imread("test.jpg");
cv::Mat result = src.clone();
cv::RotatedRect rorect(cv::Point(src.cols / 2, src.rows / 2), cv::Size(1000, 800), 50);
DrawPill(result, rorect, cv::Scalar(0, 255, 255),8,16);
imshow("original", src);
imshow("result", result);
waitKey(0);
return 0;
}
// 繪制圓端矩形（藥丸狀，pill）
void DrawPill(cv::Mat mask, const cv::RotatedRect rotatedrect, const cv::Scalar color, int thickness, int lineType)
{
cv::Mat canvas = cv::Mat::zeros(mask.size(), CV_8UC1);
// 確定短邊，短邊繪制圓形
cv::RotatedRect rect = rotatedrect;
float r = rect.size.height / 2.0f;
if (rect.size.width > rect.size.height) {
rect.size.width -= rect.size.height;
}
else {
rect.size.height -= rect.size.width;
r = rect.size.width / 2.0f;
}
cv::Point2f ps[4];
rect.points(ps);
// 繪制邊緣
std::vectorstd::vectorcv::Point>> tmpContours;
std::vectorcv::Point> contours;
for (int i = 0; i != 4; ++i) {
contours.emplace_back(cv::Point2i(ps[i]));
}
tmpContours.insert(tmpContours.end(), contours);
drawContours(canvas, tmpContours, 0, cv::Scalar(255),5, lineType); // 填充mask
// 計算常長短軸
float a = rotatedrect.size.width;
float b = rotatedrect.size.height;
int point01_x = (int)((ps[0].x + ps[1].x) / 2.0f);
int point01_y = (int)((ps[0].y + ps[1].y) / 2.0f);
int point03_x = (int)((ps[0].x + ps[3].x) / 2.0f);
int point03_y = (int)((ps[0].y + ps[3].y) / 2.0f);
int point12_x = (int)((ps[1].x + ps[2].x) / 2.0f);
int point12_y = (int)((ps[1].y + ps[2].y) / 2.0f);
int point23_x = (int)((ps[2].x + ps[3].x) / 2.0f);
int point23_y = (int)((ps[2].y + ps[3].y) / 2.0f);
cv::Point c0 = a b ? cv::Point(point12_x, point12_y) : cv::Point(point23_x, point23_y);
cv::Point c1 = a b ? cv::Point(point03_x, point03_y) : cv::Point(point01_x, point01_y);
// 長軸兩端以填充的方式畫圓，直徑等于短軸
cv::circle(canvas, c0, (int)r, cv::Scalar(255), 5, lineType);
cv::circle(canvas, c1, (int)r, cv::Scalar(255), 5, lineType);
// 繪制外圍輪廓，如果不這樣操作，會得到一個矩形加兩個圓形，丑。。。
std::vectorstd::vectorcv::Point>> EXcontours;
cv::findContours(canvas,EXcontours,cv::RETR_EXTERNAL, CHAIN_APPROX_SIMPLE);
drawContours(mask, EXcontours, 0, color, thickness,lineType); // 填充mask
}
到此這篇關于OpenCV繪制圓端矩形的示例代碼的文章就介紹到這了,更多相關OpenCV 圓端矩形內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關文章希望大家以后多多支持腳本之家！
