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3-1_DrawAndText.cpp
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#include <opencv2/opencv.hpp>
using namespace std;
using namespace cv;
int main()
{
//Step1. 建立一個畫布(三通道彩色圖) : 512x512 & 黑底色
//Mat drawImg(影像高, 影像寬, CV_8UC3, Scalar(給B值, 給G值, 給R值));
//---------------------------------------------//
//Step2. 畫直線 : 起點(100,10) --> 終點(320, 100) & 綠色 & 線粗為 8 & 4連通
//line(drawImg, Point(給X值, 給Y值), Point(給X值, 給Y值), Scalar(給B值, 給G值, 給R值), 線粗大小, 幾連通);
//---------------------------------------------//
//Step3. 繪製圓(空心) : 圓心(150, 150) & 半徑100 & 顏色任選 & 線粗為 4 & 8連通
//circle(目標圖片, Point(圓心X, 圓心Y), 半徑大小, Scalar(給B值, 給G值, 給R值), 線粗大小, 幾連通);
//畫一個實心的圓 thickness : CV_FILLED 或 負值
//circle(目標圖片, Point(圓心X, 圓心Y), 半徑大小, Scalar(給B值, 給G值, 給R值), thickness, 幾連通);
//---------------------------------------------//
//Step4. 畫矩形 : 起點左上(10,10) --> 終點右下(240, 200) & 顏色任選(128, 255, 0) & 線粗任選 & 8連通
//rectangle(目標圖片, Point(左上X, 左上Y), Point(右下X, 右下Y), Scalar(給B值, 給G值, 給R值), 線粗大小, 幾連通);
//Step5. 畫矩形填充的四邊形(實心) thickness : CV_FILLED 或 負值
//rectangle(drawImg, Rect(起點X, 起點Y, 起點X+W, 起點Y+H), Scalar(給B值, 給G值, 給R值), thickness, 8);
//---------------------------------------------//
//Step6. [補充] 繪製橢圓
//ellipse(drawImg, Point(150, 150), Size(100, 50), 45, 0, 360, Scalar(0, 255, 0), 2, 8);
//Step7. 變數給值方式
/*
Point center(300, 300);
Size axes(40, 80);
double angle = 90;
int lineWidth = 5;
ellipse(drawImg, center, axes, angle, 0, 360, Scalar(255, 0, 0), 4);
*/
//---------------------------------------------//
/*
//Step8. 繪製多邊形
const int NPT = 5;
Point points[1][NPT];
points[0][0] = Point(230, 270);
points[0][1] = Point(240, 220);
points[0][2] = Point(310, 255);
points[0][3] = Point(334, 326);
points[0][4] = Point(228, 346);
const Point* pts[1] = { points[0] };
bool bClosed = true; //可以是非封閉多邊形
polylines(drawImg, pts, &NPT, 1, bClosed, Scalar(255, 128, 0), 6);
*/
//---------------------------------------------//
/*
//Step9. 文字處理
int lineWidth = 2;
double fontScale = 1;
const Scalar whiteColor(255, 255, 255), pinkColor(230, 130, 255);
//putText(drawImg, string("ITtraining"), Point(100, 440), CV_FONT_HERSHEY_COMPLEX, 字體大小, 字體顏色, 幾連通);
//putText(drawImg, string("OpenCV"), Point(200, 480), CV_FONT_HERSHEY_COMPLEX, 字體大小, 字體顏色, 幾連通);
*/
imshow("DrawAPI", drawImg);
waitKey(0);
}