Week13 閻覃的上課筆記

Week13 閻覃的上課筆記TRT複習安裝OpenCV會自動轉動的地球地球變茶壺

TRT複習

 
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glPushMatrix();
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glTranslatef(0.4,0.5,0);
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glRotatef(30,0,0,1);
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glTranslatef(0.5,0.3,0);
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drawArm();
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glPopMatrix();

安裝OpenCV

首先開啟終端，使用brew安裝opencv

 
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brew install homebrew/science/opencv

配置Clion的工程，CMakeLists.txt

 
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cmake_minimum_required(VERSION 3.7)
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project(05052553_week13)
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​
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find_package(OpenCV)
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#或者find_package(OpenCV3)
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include_directories( ${OpenCV_INCLUDE_DIRS} )
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​
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -framework GLUT -framework OpenGL")
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​
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set(SOURCE_FILES main.cpp)
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add_executable(05052553_week13 ${SOURCE_FILES})
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target_link_libraries(05052553_week13 ${OpenCV_LIBS} )

輸入以下的程式碼

 
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#include <iostream>
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#include <opencv2/opencv.hpp>
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​
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using namespace std;
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using namespace cv;
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​
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int main() {
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    Mat srcImage = imread("img.jpeg");
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    imshow("img", srcImage);
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    waitKey(0);
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    return 0;
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}

其中，圖片存到如下的目錄即可

運行結果如下

會自動轉動的地球

直接將老師的程式碼複製過來就好

 
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//#include <iostream>
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//#include <opencv2/opencv.hpp>
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#include <opencv/highgui.h> ///for cvLoadImage()
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#include <opencv/cv.h> ///for cvCvtColor()
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#include <GLUT/glut.h> ///3D glut
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#include <stdio.h>
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GLUquadric * quad;
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GLuint id;
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float angle=0;
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void display()
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{   glEnable(GL_DEPTH_TEST); ///要啟動 Detph Test 深度值的測試,3D顯示才正確
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    glClear(GL_COLOR_BUFFER_BIT  | GL_DEPTH_BUFFER_BIT);
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    glPushMatrix();///自動轉很帥
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    glRotatef(90, 1,0,0);
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    glRotatef(angle, 0,0,1);///自動轉很帥
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    gluQuadricTexture(quad, 1);
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    gluSphere(quad, 1, 30, 30);///glutSolidTeapot(0.3);
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    glPopMatrix();///自動轉很帥
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    glFlush();
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}
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void timer(int t)
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{   glutTimerFunc(20, timer, 0);/// 1000 msec   50fps:20msec
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    angle+=1;///自動轉很帥
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    glutPostRedisplay();
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}
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int myTexture(char *filename)
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{
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    IplImage * img = cvLoadImage(filename); ///OpenCV讀圖
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    cvCvtColor(img,img, CV_BGR2RGB); ///OpenCV轉色彩 (需要cv.h)
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    glEnable(GL_TEXTURE_2D); ///1. 開啟貼圖功能
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    GLuint id; ///準備一個 unsigned int 整數, 叫 貼圖ID
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    glGenTextures(1, &id); /// 產生Generate 貼圖ID
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    glBindTexture(GL_TEXTURE_2D, id); ///綁定bind 貼圖ID
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    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); /// 貼圖參數, 超過包裝的範圖T, 就重覆貼圖
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    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); /// 貼圖參數, 超過包裝的範圖S, 就重覆貼圖
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    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); /// 貼圖參數, 放大時的內插, 用最近點
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    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); /// 貼圖參數, 縮小時的內插, 用最近點
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    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img->width, img->height, 0, GL_RGB, GL_UNSIGNED_BYTE, img->imageData);
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    return id;
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}
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​
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void myInit()
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{   quad = gluNewQuadric();
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    id = myTexture("image.jpg");
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}
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int main(int argc, char**argv)
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{   glutInit(&argc, argv);
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    glutCreateWindow("3D");
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    glutDisplayFunc(display); ///顯示
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    glutTimerFunc(0, timer, 0);
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    myInit(); ///我的 init 初始化 把貼圖準備好 前面OpenCV 2行, 後面 OpenGL 9行
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    glutMainLoop();
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}

地球變茶壺

將gluSphere換成glutSolidTeapot即可。具體的程式碼如下

 
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void display()
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{   glEnable(GL_DEPTH_TEST); ///要啟動 Detph Test 深度值的測試,3D顯示才正確
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    glClear(GL_COLOR_BUFFER_BIT  | GL_DEPTH_BUFFER_BIT);
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    glPushMatrix();///自動轉很帥
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    glRotatef(90, 1,0,0);
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    glRotatef(angle, 0,0,1);///自動轉很帥
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    gluQuadricTexture(quad, 1);
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    //gluSphere(quad, 1, 30, 30);///glutSolidTeapot(0.3);
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    glutSolidTeapot(0.3);
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    glPopMatrix();///自動轉很帥
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    glFlush();
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}