#include<opencv2/opencv.hpp>
#include<opencv2/imgproc/imgproc.hpp>
#include<opencv2/highgui/highgui.hpp>
#include<iostream>
using namespace std;
using namespace cv;
#define WINDOW_NAME1 "【原始图窗口】"
#define WINDOW_NAME2 "【经过Warp后的窗口】"
#define WINDOW_NAME3 "【经过Warp和Rotate后的窗口】"
int main()
{
system("color 2F");
//参数准备
Point2f srcTriangle[3];
Point2f dstTriangle[3];
Mat rotMat(2, 3, CV_32FC1);
Mat warpMat(2, 3, CV_32FC1);
Mat srcImage, dstImage_warp, dstImage_warp_rotate;
//加载源图像
srcImage = imread("E:\\Pec\\lan.jpg",1);
//设置目标图像的大小和类型与源图像一致
dstImage_warp = Mat::zeros(srcImage.rows, srcImage.cols, srcImage.type());
//设置源图像和目标图像上的三组点以计算仿射变换
//srcTriangle[0] = Point2f(0, 0); //Point2f表示Point类的两个数据x,y为float类型;vector 表示存放四维int
//srcTriangle[1] = Point2f(static_cast<float>(srcImage.cols - 1), 0);
//srcTriangle[2] = Point2f(0, static_cast<float>(srcImage.rows - 1));
//dstTriangle[0] = Point2f(static_cast<float>(srcImage.cols*0.0), static_cast<float>(srcImage.rows*0.33));
//dstTriangle[1] = Point2f(static_cast<float>(srcImage.cols*0.65), static_cast<float>(srcImage.rows*0.35));
//dstTriangle[2] = Point2f(static_cast<float>(srcImage.cols*0.15), static_cast<float>(srcImage.rows*0.6));
//获取变换矩阵,指定三个点
srcTriangle[0] = Point2f(50, 50);
srcTriangle[1] = Point2f(200, 50);
srcTriangle[2] = Point2f(50, 200);
dstTriangle[0] = Point2f(100, 100);
dstTriangle[1] = Point2f(200, 50);
dstTriangle[2] = Point2f(100, 250);
//求仿射变换,得到一个2x3的矩阵
warpMat = getAffineTransform(srcTriangle, dstTriangle);
//对源图像应用刚刚的求得的仿射变换
warpAffine(srcImage, dstImage_warp, warpMat, dstImage_warp.size());
//对图像进行缩放后再旋转
//计算图像中点顺时针旋转50°缩放因子为0.6的旋转矩阵
Point center = Point(dstImage_warp.cols / 2, dstImage_warp.rows / 2);
double angle = -30.0;
double scale = 0.8;
//通过上面的旋转细节信息求出旋转矩阵
rotMat = getRotationMatrix2D(center, angle, scale);
//旋转已经缩放后的图像
warpAffine(dstImage_warp, dstImage_warp_rotate, rotMat, dstImage_warp.size());
imshow(WINDOW_NAME1, srcImage);
imshow(WINDOW_NAME2, dstImage_warp);
imshow(WINDOW_NAME3, dstImage_warp_rotate);
waitKey(0);
return 0;
}