#include "opencv2/calib3d/calib3d.hpp"  
#include "opencv2/highgui/highgui.hpp"  
#include "opencv2/imgproc/imgproc.hpp"  
 
using namespace cv;
using namespace std;

void DrawTransRec(Mat mat, int x, int y, int width, int height, CvScalar color, double alpha);

void DrawTransRec(Mat mat, int x, int y, int width, int height, CvScalar color, double alpha)
{
	IplImage * img = &(IplImage)mat;
	IplImage * rec = cvCreateImage(cvSize(width, height), img->depth, img->nChannels);
	//if(x>0&&y>0&&x<mat.cols&&y<mat.){  
	cv::Rect roi = cv::Rect(x, y, width, height) & cv::Rect(0, 0, mat.cols, mat.rows);
	if (roi.area() != width*height)return;
	cvRectangle(rec, cvPoint(0, 0), cvPoint(width, height), color, -1);
	cvSetImageROI(img, cvRect(roi.x, roi.y, roi.width, roi.height));
	cvAddWeighted(img, alpha, rec, 1 - alpha, 0.0, img);
	cvResetImageROI(img);
	cvReleaseImage( &rec);
}

int main(int argc, char** argv)
{
	Mat picture(500, 500, CV_8UC3, Scalar(255, 255, 255, 0.5));

	// 畫箭頭
	Point point1 = Point(0, 0);
	Point point2 = Point(100, 100);  // 2表示線寬  8 表示線型  0 暫時不清楚  0.1表示箭頭的長度
	arrowedLine(picture, point1, point2, Scalar(0, 255, 0), 2,8,0,0.1);

	//畫直線
	point1 = Point(0, 100);
	point2 = Point(100, 200); // 2表示線寬  8 表示線型
	line(picture, point1, point2, Scalar(0, 0, 255), 2, 8, 0);

	//畫圓
	int r = 50;//半徑  
	Point center = Point(150, 50);  //其中2改為-1 表示填充
	circle(picture, center, r, Scalar(123, 21, 32), 2,8,0);  

	//畫矩形
	Rect rec(300,300,150,150);
	rectangle(picture, rec, Scalar(123, 21, 32), 2, 8, 0);

	//clipLine的作用是剪下影象矩形區域內部的直線
	point1 = Point(250, 250);
	point2 = Point(450, 450);
	line(picture, point1, point2, Scalar(0, 255, 0), 2, 8, 0);
	clipLine(rec, point1, point2);
	line(picture, point1, point2, Scalar(0, 0, 255), 2, 8, 0);

	//輸入文字
	Point textPt(210, 50);
	String text = "drawtext";
	int fontFace = FONT_HERSHEY_PLAIN;
	double fontScale = 2;
	int thickness = 2;
	putText(picture, text, textPt, fontFace, fontScale, Scalar(0, 111, 255), thickness);
	//getTextSize()返回一個指定字型以及大小的String所佔的空間
	int baseline = 0;
	Size textSize = getTextSize(text, fontFace,fontScale, thickness, &baseline);
	rectangle(picture, Point(textPt.x, textPt.y - textSize.height), Point(textPt.x + textSize.width, textPt.y + thickness/2), Scalar(0, 255, 0, 1), 1);

	//畫標記  
	//目前支援六種標記
	//MARKER_TILTED_CROSS,MARKER_STAR, MARKER_DIAMOND, MARKER_SQUARE ,MARKER_TRIANGLE_UP, MARKER_TRIANGLE_DOWN 
	drawMarker(picture, Point(480, 50), Scalar(0, 0, 255), MARKER_TILTED_CROSS);

	//畫橢圓
	Size 軸(20, 50);//軸線長度，橫著20，豎著50  
	ellipse(picture, Point(50, 150), 軸, 20.0, 0.0, 300.0, Scalar(55, 123, 222), -1);
	//引數說明，axes表示軸，20.0表示整個橢圓旋轉20度，從0開始畫到300度  
	//過載函式利用了RotatedRect,表示在一個旋轉矩形裡畫最大橢圓  
	RotatedRect box1(Point(150, 150), Size(40, 100), -20);//負的為逆時針  
	ellipse(picture, box1, Scalar(122, 122, 122));
	vector<Point> pointstest;
	ellipse2Poly(Point(50, 150), 軸, 20.0, 0.0, 300.0, 1, pointstest);

	//畫多邊形
	Point points[2][20];
	points[0][0] = Point(300, 100);
	points[0][1] = Point(400, 100);
	points[0][2] = Point(450, 200);
	points[0][3] = Point(350, 250);
	points[0][4] = Point(250, 200);

	points[1][0] = Point(300, 100) + Point(-200, +150);
	points[1][1] = Point(400, 100) + Point(-200, +150);
	points[1][2] = Point(450, 200) + Point(-200, +150);
	points[1][3] = Point(350, 250) + Point(-200, +150);
	points[1][4] = Point(250, 200) + Point(-200, +150);
	const Point* pt[2] = { points[0], points[1] };
	int npt[2] = { 5,5 };
	polylines(picture, pt, npt, 2, 1, Scalar(0, 0, 255), 3);
	fillPoly(picture, pt, npt, 1, Scalar(250, 255, 0), 8);
	
	//繪製半透明矩形
	DrawTransRec(picture, 50, 320, 400, 100, Scalar(255, 122, 122), 0.2);

	imshow("show", picture);
	waitKey(0);
	return 0;
}