ch04 drawing

#python code

import cv2
import numpy as np

def drawLines():
    img = np.full((400, 400, 3), (255, 255, 255), dtype=np.uint8)

    cv2.line(img, (50, 50), (200, 50), (0, 0, 255))
    cv2.line(img, (50, 100), (200, 100), (255, 0, 255), 3)
    cv2.line(img, (50, 150), (200, 150), (255, 0, 0), 10)

    cv2.line(img, (250, 50), (350, 100), (0, 0, 255), 1, cv2.LINE_4)
    cv2.line(img, (250, 70), (350, 120), (255, 0, 255), 1, cv2.LINE_8)
    cv2.line(img, (250, 90), (350, 140), (255, 0, 0), 1, cv2.LINE_AA)

    cv2.arrowedLine(img, (50, 200), (150, 200), (0, 0, 255), 1)
    cv2.arrowedLine(img, (50, 250), (350, 250), (255, 0, 255), 1)
    cv2.arrowedLine(img, (50, 300), (350, 300), (255, 0, 0), 1, tipLength=0.05)

    cv2.drawMarker(img, (50, 350), (0, 0, 255), markerType=cv2.MARKER_CROSS)
    cv2.drawMarker(img, (100, 350), (0, 0, 255), markerType=cv2.MARKER_TILTED_CROSS)
    cv2.drawMarker(img, (150, 350), (0, 0, 255), markerType=cv2.MARKER_STAR)
    cv2.drawMarker(img, (200, 350), (0, 0, 255), markerType=cv2.MARKER_DIAMOND)
    cv2.drawMarker(img, (250, 350), (0, 0, 255), markerType=cv2.MARKER_SQUARE)
    cv2.drawMarker(img, (300, 350), (0, 0, 255), markerType=cv2.MARKER_TRIANGLE_UP)
    cv2.drawMarker(img, (350, 350), (0, 0, 255), markerType=cv2.MARKER_TRIANGLE_DOWN)

    cv2.imshow("img", img)
    cv2.waitKey(0)
    cv2.destroyAllWindows()

def drawPolys():
    img = np.full((400, 400, 3), (255, 255, 255), dtype=np.uint8)

    cv2.rectangle(img, (50, 50, 100, 50), (0, 0, 255), 2)
    cv2.rectangle(img, (50, 150, 100, 50), (0, 0, 128), -1)

    cv2.circle(img, (300, 120), 30, (255, 255, 0), -1, cv2.LINE_AA)
    cv2.circle(img, (300, 120), 60, (255, 0, 0), 3, cv2.LINE_AA)

    cv2.ellipse(img, (120, 300), (60, 30), 20, 0, 270, (255, 255, 0), -1, cv2.LINE_AA)
    cv2.ellipse(img, (120, 300), (100, 50), 20, 0, 360, (0, 255, 0), 2, cv2.LINE_AA)

    pts = np.array([[250, 250], [300, 250], [300, 300], [350, 300], [350, 350], [250, 350]], np.int32)
    pts = pts.reshape((-1, 1, 2))
    cv2.polylines(img, [pts], True, (255, 0, 255), 2)

    cv2.imshow("img", img)
    cv2.waitKey(0)
    cv2.destroyAllWindows()

def drawText1():
    img = np.full((500, 800, 3), (255, 255, 255), dtype=np.uint8)

    cv2.putText(img, "FONT_HERSHEY_SIMPLEX", (20, 50), cv2.FONT_HERSHEY_SIMPLEX, 1, (0, 0, 255))
    cv2.putText(img, "FONT_HERSHEY_PLAIN", (20, 100), cv2.FONT_HERSHEY_PLAIN, 1, (0, 0, 255))
    cv2.putText(img, "FONT_HERSHEY_DUPLEX", (20, 150), cv2.FONT_HERSHEY_DUPLEX, 1, (0, 0, 255))
    cv2.putText(img, "FONT_HERSHEY_COMPLEX", (20, 200), cv2.FONT_HERSHEY_COMPLEX, 1, (255, 0, 0))
    cv2.putText(img, "FONT_HERSHEY_TRIPLEX", (20, 250), cv2.FONT_HERSHEY_TRIPLEX, 1, (255, 0, 0))
    cv2.putText(img, "FONT_HERSHEY_COMPLEX_SMALL", (20, 300), cv2.FONT_HERSHEY_COMPLEX_SMALL, 1, (255, 0, 0))
    cv2.putText(img, "FONT_HERSHEY_SCRIPT_SIMPLEX", (20, 350), cv2.FONT_HERSHEY_SCRIPT_SIMPLEX, 1, (255, 0, 255))
    cv2.putText(img, "FONT_HERSHEY_SCRIPT_COMPLEX", (20, 400), cv2.FONT_HERSHEY_SCRIPT_COMPLEX, 1, (255, 0, 255))
    cv2.putText(img, "FONT_HERSHEY_COMPLEX | FONT_ITALIC", (20, 450), cv2.FONT_HERSHEY_COMPLEX | cv2.FONT_ITALIC, 1, (255, 0, 0))

    cv2.imshow("img", img)
    cv2.waitKey(0)
    cv2.destroyAllWindows()

def drawText2():
    img = np.full((200, 640, 3), (255, 255, 255), dtype=np.uint8)

    text = "Hello, OpenCV"
    fontFace = cv2.FONT_HERSHEY_TRIPLEX
    fontScale = 2.0
    thickness = 1

    sizeText = cv2.getTextSize(text, fontFace, fontScale, thickness)[0]
    sizeImg = img.shape

    org = ((sizeImg[1] - sizeText[0]) // 2, (sizeImg[0] + sizeText[1]) // 2)
    cv2.putText(img, text, org, fontFace, fontScale, (255, 0, 0), thickness)
    cv2.rectangle(img, org, (org[0] + sizeText[0], org[1] - sizeText[1]), (0, 255, 0), 1)

    cv2.imshow("img", img)
    cv2.waitKey(0)
    cv2.destroyAllWindows()

if __name__ == "__main__":
    drawLines()
    drawPolys()
    drawText1()
    drawText2()

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// C++ code

#include "opencv2/opencv.hpp"
#include <iostream>

using namespace cv;
using namespace std;

void drawLines();
void drawPolys();
void drawText1();
void drawText2();

int main(void)
{
	drawLines();
	drawPolys();
	drawText1();
	drawText2();

	return 0;
}

void drawLines()
{
	Mat img(400, 400, CV_8UC3, Scalar(255, 255, 255));

	line(img, Point(50, 50), Point(200, 50), Scalar(0, 0, 255));
	line(img, Point(50, 100), Point(200, 100), Scalar(255, 0, 255), 3);
	line(img, Point(50, 150), Point(200, 150), Scalar(255, 0, 0), 10);

	line(img, Point(250, 50), Point(350, 100), Scalar(0, 0, 255), 1, LINE_4);
	line(img, Point(250, 70), Point(350, 120), Scalar(255, 0, 255), 1, LINE_8);
	line(img, Point(250, 90), Point(350, 140), Scalar(255, 0, 0), 1, LINE_AA);

	arrowedLine(img, Point(50, 200), Point(150, 200), Scalar(0, 0, 255), 1);
	arrowedLine(img, Point(50, 250), Point(350, 250), Scalar(255, 0, 255), 1);
	arrowedLine(img, Point(50, 300), Point(350, 300), Scalar(255, 0, 0), 1, LINE_8, 0, 0.05);

	drawMarker(img, Point(50, 350), Scalar(0, 0, 255), MARKER_CROSS);
	drawMarker(img, Point(100, 350), Scalar(0, 0, 255), MARKER_TILTED_CROSS);
	drawMarker(img, Point(150, 350), Scalar(0, 0, 255), MARKER_STAR);
	drawMarker(img, Point(200, 350), Scalar(0, 0, 255), MARKER_DIAMOND);
	drawMarker(img, Point(250, 350), Scalar(0, 0, 255), MARKER_SQUARE);
	drawMarker(img, Point(300, 350), Scalar(0, 0, 255), MARKER_TRIANGLE_UP);
	drawMarker(img, Point(350, 350), Scalar(0, 0, 255), MARKER_TRIANGLE_DOWN);

	imshow("img", img);
	waitKey();

	destroyAllWindows();
}

void drawPolys()
{
	Mat img(400, 400, CV_8UC3, Scalar(255, 255, 255));

	rectangle(img, Rect(50, 50, 100, 50), Scalar(0, 0, 255), 2);
	rectangle(img, Rect(50, 150, 100, 50), Scalar(0, 0, 128), -1);

	circle(img, Point(300, 120), 30, Scalar(255, 255, 0), -1, LINE_AA);
	circle(img, Point(300, 120), 60, Scalar(255, 0, 0), 3, LINE_AA);

	ellipse(img, Point(120, 300), Size(60, 30), 20, 0, 270, Scalar(255, 255, 0), FILLED, LINE_AA);
	ellipse(img, Point(120, 300), Size(100, 50), 20, 0, 360, Scalar(0, 255, 0), 2, LINE_AA);

	vector<Point> pts;
	pts.push_back(Point(250, 250)); pts.push_back(Point(300, 250));
	pts.push_back(Point(300, 300)); pts.push_back(Point(350, 300));
	pts.push_back(Point(350, 350)); pts.push_back(Point(250, 350));
	polylines(img, pts, true, Scalar(255, 0, 255), 2);

	imshow("img", img);
	waitKey();

	destroyAllWindows();
}

void drawText1()
{
	Mat img(500, 800, CV_8UC3, Scalar(255, 255, 255));

	putText(img, "FONT_HERSHEY_SIMPLEX", Point(20, 50), FONT_HERSHEY_SIMPLEX, 1, Scalar(0, 0, 255));
	putText(img, "FONT_HERSHEY_PLAIN", Point(20, 100), FONT_HERSHEY_PLAIN, 1, Scalar(0, 0, 255));
	putText(img, "FONT_HERSHEY_DUPLEX", Point(20, 150), FONT_HERSHEY_DUPLEX, 1, Scalar(0, 0, 255));
	putText(img, "FONT_HERSHEY_COMPLEX", Point(20, 200), FONT_HERSHEY_COMPLEX, 1, Scalar(255, 0, 0));
	putText(img, "FONT_HERSHEY_TRIPLEX", Point(20, 250), FONT_HERSHEY_TRIPLEX, 1, Scalar(255, 0, 0));
	putText(img, "FONT_HERSHEY_COMPLEX_SMALL", Point(20, 300), FONT_HERSHEY_COMPLEX_SMALL, 1, Scalar(255, 0, 0));
	putText(img, "FONT_HERSHEY_SCRIPT_SIMPLEX", Point(20, 350), FONT_HERSHEY_SCRIPT_SIMPLEX, 1, Scalar(255, 0, 255));
	putText(img, "FONT_HERSHEY_SCRIPT_COMPLEX", Point(20, 400), FONT_HERSHEY_SCRIPT_COMPLEX, 1, Scalar(255, 0, 255));
	putText(img, "FONT_HERSHEY_COMPLEX | FONT_ITALIC", Point(20, 450), FONT_HERSHEY_COMPLEX | FONT_ITALIC, 1, Scalar(255, 0, 0));

	imshow("img", img);
	waitKey();

	destroyAllWindows();
}

void drawText2()
{
	Mat img(200, 640, CV_8UC3, Scalar(255, 255, 255));

	const String text = "Hello, OpenCV";
	int fontFace = FONT_HERSHEY_TRIPLEX;
	double fontScale = 2.0;
	int thickness = 1;

	Size sizeText = getTextSize(text, fontFace, fontScale, thickness, 0);
	Size sizeImg = img.size();

	Point org((sizeImg.width - sizeText.width) / 2, (sizeImg.height + sizeText.height) / 2);
	putText(img, text, org, fontFace, fontScale, Scalar(255, 0, 0), thickness);
	rectangle(img, org, org + Point(sizeText.width, -sizeText.height), Scalar(0, 255, 0), 1);

	imshow("img", img);
	waitKey();

	destroyAllWindows();
}

C++ Code 출처 : OpenCV 4로 배우는 컴퓨터 비전과 머신 러닝 - 황선규 저

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