图形学二维几何变换之正方形的变换组合

// 提示：写完代码请保存之后再进行评测
#include <GL/freeglut.h>#include<stdio.h>// 评测代码所用头文件-开始#include<opencv2/core/core.hpp>#include<opencv2/highgui/highgui.hpp>#include<opencv2/imgproc/imgproc.hpp>// 评测代码所用头文件-结束void init(void){ glClearColor(0.0, 0.0, 0.0, 0.0); //设置背景颜色 glMatrixMode(GL_PROJECTION); gluOrtho2D(-5.0, 5.0, -5.0, 5.0); //设置显示的范围是X:-5.0~5.0, Y:-5.0~5.0 glMatrixMode(GL_MODELVIEW);}void myDraw(void) //Two dimensional geometric transformation{ /********** Begin / glClear(GL_COLOR_BUFFER_BIT); glLoadIdentity(); //Set the current matrix to the identity matrix // Please add your code here glPushMatrix(); glColor3f(1.0, 0.0, 0.0); glRectf(-1.0,-1.0,1.0,1.0); glPopMatrix(); glPushMatrix(); glTranslatef(0.0f, 2.0f, 0.0f); glScalef(3.0, 0.5, 1.0); glColor3f(1.0, 1.0, 1.0); glRectf(-1.0,-1.0,1.0,1.0); glPopMatrix(); glPushMatrix(); glTranslatef(-3.0, 0.0, 0.0); glPushMatrix(); glRotatef(45.0, 0.0, 0.0, 1.0); glColor3f(0.0, 1.0, 0.0); glRectf(-1.0,-1.0,1.0,1.0); glPopMatrix(); glTranslatef(6.0, 0.0, 0.0); glPushMatrix(); glRotatef(45.0, 0.0, 0.0, 1.0); glColor3f(0.0, 0.7, 0.0); glRectf(-1.0,-1.0,1.0,1.0); glPopMatrix(); glPopMatrix(); glTranslatef(0.0, -3.0, 0.0); glScalef(4.0, 1.5, 1.0); glColor3f(0.0, 0.0, 1.0); glRectf(-1.0,-1.0,1.0,1.0); /** End *****/ glFlush();}int main(int argc, char argv[]){ glutInit(&argc, argv); glutInitWindowPosition(100, 100); glutInitWindowSize(400, 400); glutCreateWindow(“几何变换示例”); init(); glutDisplayFunc(&myDraw); glutMainLoopEvent(); /以下为评测代码，与本次实验内容无关，请勿修改/ GLubyte pPixelData = (GLubyte)malloc(400 * 400 * 3);//分配内存 GLint viewport[4] = {0}; glReadBuffer(GL_FRONT); glPixelStorei(GL_UNPACK_ALIGNMENT, 4); glGetIntegerv(GL_VIEWPORT, viewport); glReadPixels(viewport[0], viewport[1], viewport[2], viewport[3], GL_RGB, GL_UNSIGNED_BYTE, pPixelData); cv::Mat img; std::vectorcv::Mat imgPlanes; img.create(400, 400, CV_8UC3); cv::split(img, imgPlanes); for(int i = 0; i < 400; i ++) { unsigned char plane0Ptr = imgPlanes[0].ptr(i); unsigned char plane1Ptr = imgPlanes[1].ptr(i); unsigned char plane2Ptr = imgPlanes[2].ptr(i); for(int j = 0; j < 400; j ++) { int k = 3 * (i * 400 + j); plane2Ptr[j] = pPixelData[k]; plane1Ptr[j] = pPixelData[k+1]; plane0Ptr[j] = pPixelData[k+2]; } } cv::merge(imgPlanes, img); cv::flip(img, img ,0); cv::namedWindow(“openglGrab”); cv::imshow(“openglGrab”, img); //cv::waitKey(); cv::imwrite("…/img_step3/test.jpg", img); return 0;}

标签：1.0,img,0.0,图形学,正方形,几何变换,400,GL,cv
来源： https://blog.csdn.net/qq_46686742/article/details/121496432