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CG1-v1.0-点和直线的绘制 第1关：OpenGL点的绘制 一. 任务描述根据下面要求，在右侧修改代码，绘制出预期输出的图片。平台会对你编写的代码进行测试。 1.本关任务 熟悉编程环境； 了解光栅图形显示器的特点； 了解计算机绘图的特点； 进行编程，以OpenGL为开发平台设计程序，以能够在屏幕上生成三个坐标、颜色和尺寸一定的点。
3.具体要求 (1) 背景色为黑色，用 glClearColor()来完成； (2) 渲染的点的直径设置为 3； (3) 选用 GL_POINTS 作为图形类型； (4) 三个点的颜色分别为（1.0f, 0.0f, 0.0f), (0.0f,1.0f,0.0f), (0.0f,0.0f,1.0f)； (5) 三个点对应的顶点坐标分别为（-0.4f,-0.4f), (0.0f,0.0f), (0.4f,0.4f)。 // 提示：写完代码请保存之后再进行评测 #include #include // 评测代码所用头文件-开始 #include #include #include // 评测代码所用头文件-结束 void myDisplay(void) { // 请在此添加你的代码 /********** Begin ********/ glClearColor(0.0,0.0,0.0,0.0); glPointSize(3); glBegin(GL_POINTS); glColor3f(1.0,0.0,0.0); glVertex2f(-0.4,-0.4); glColor3f(0.0,1.0,0.0); glVertex2f(0.0,0.0); glColor3f(0.0,0.0,1.0); glVertex2f(0.4,0.4); glEnd(); /********** End **********/ glFlush(); } int main(int argc, char *argv[]) { glutInit(&argc, argv); glutInitWindowPosition(100, 100); glutInitWindowSize(400, 400); glutCreateWindow("Hello Point!"); glutDisplayFunc(&myDisplay); 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::vector 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_step1/test.jpg", img); return 0; } 第2关：OpenGL简单图形绘制 一.任务描述根据下面要求，在右侧修改代码，绘制出预期输出的图片。平台会对你编写的代码进行测试。 1.本关任务 利用 OpenGL 作为开发平台设计程序，生成一个光栅图
3.具体要求 (1).使用黑色作为背景，采用 glClearColor 来实现； (2).绘制一个矩形，颜色为(1.0f,1.0f,1.0f)，矩阵位置（-0.5f，-0.5f，0.5f，0.5f)； (3).绘制一个三角形，三个顶点颜色分别为（1.0f, 0.0f, 0.0f), (0.0f,1.0f,0.0f)， (0.0f,0.0f,1.0f)，对应的顶点坐标分别为(0.0f,1.0f), (0.8f,-0.5f), (-0.8f,-0.5f)； (4).绘制三个直径为3的点，颜色为（1.0f, 0.0f, 0.0f)， (0.0f,1.0f,0.0f)， (0.0f,0.0f,1.0f)，对应的顶点坐标分别为（-0.4f,-0.4f), (0.0f,0.0f)，(0.4f,0.4f)。 // 提示：写完代码请保存之后再进行评测 #include #include // 评测代码所用头文件-开始 #include #include #include // 评测代码所用头文件-结束 void myDisplay(void) { // 请在此添加你的代码 /********** Begin ********/ glClearColor(0.0,0.0,0.0,0.0); glColor3f(1.0,1.0,1.0); glRectf(-0.5,-0.5,0.5,0.5); glBegin(GL_TRIANGLES); glColor3f(1.0,0.0,0.0); glVertex2f(0.0,1.0); glColor3f(0.0,1.0,0.0); glVertex2f(0.8,-0.5); glColor3f(0.0,0.0,1.0); glVertex2f(-0.8,-0.5); glEnd(); glPointSize(3); glBegin(GL_POINTS); glColor3f(1.0,0.0,0.0); glVertex2f(-0.4,-0.4); glColor3f(0.0,1.0,0.0); glVertex2f(0.0,0.0); glColor3f(0.0,0.0,1.0); glVertex2f(0.4,0.4); glEnd(); /********** End **********/ glFlush(); } int main(int argc, char *argv[]) { glutInit(&argc, argv); glutInitWindowPosition(100, 100); glutInitWindowSize(400, 400); glutCreateWindow("Hello Point!"); glutDisplayFunc(&myDisplay); 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::vector 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_step2/test.jpg", img); return 0; } 第3关：OpenGL直线绘制 一.任务描述根据下面要求，在右侧修改代码，绘制出预期输出的图片。平台会对你编写的代码进行测试。 1.本关任务 理解基本图形元素光栅化的基本原理； 了解和使用OpenGL的生成直线的命令，来验证程序运行结果。
3.具体要求 (1).背景色为黑色，用 glclearcolor 来完成； (2).绘制一个矩形，颜色为(1.0f,0.0f,0.0f)，矩形位置（25.0，25.0，75.0，75.0)； (3).绘制一个直径为10的点，颜色为（0.0f, 1.0f, 0.0f)，对应的点坐标为原点； (4).利用GL_LINES的绘线方式绘制一条线，其中线段的两个顶点颜色分别为(0.0f, 1.0f, 0.0f),(0.0f, 1.0f, 0.0f)两个顶点的坐标分别为(100.0f, 0.0f),(180.0f, 240.0f); 5.调用向glutReshapeFunC注册的函数 // 提示：写完代码请保存之后再进行评测 #include #include // 评测代码所用头文件-开始 #include #include #include // 评测代码所用头文件-结束 void myDisplay(void) { // 请在此添加你的代码 /********** Begin ********/ glClearColor(0.0,0.0,0.0,0.0); glColor3f(1.0,0.0f,0.0f); glRectf(25.0,25.0,75.0,75.0); glPointSize(10); glBegin(GL_POINTS); glColor3f(0.0f,1.0f,0.0f); glVertex2f(0.0f,0.0f); glEnd(); glBegin(GL_LINES); glColor3f(0.0f,1.0f,0.0f); glVertex2f(100.0f,0.0f); glColor3f(0.0f,1.0f,0.0f); glVertex2f(180.0f,240.0f); glEnd(); /********** End **********/ glFlush(); } void Init() { glClearColor(0.0, 0.0, 0.0, 0.0); glShadeModel(GL_SMOOTH); } void myReshape(int w, int h) { glViewport(0, 0, (GLsizei)w, (GLsizei)h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0.0, (GLdouble)w, 0.0, (GLdouble)h); } int main(int argc, char *argv[]) { glutInit(&argc, argv); glutInitWindowPosition(100, 100); glutInitWindowSize(400, 400); glutCreateWindow("Hello Point!"); Init(); glutDisplayFunc(myDisplay); glutReshapeFunc(myReshape); 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::vector 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; } 第4关：0 |
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