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sharepoint阀值 SHAREPOINT软件工程师招聘

编程题目：利用Opengl绘制一个三角形。

//编译环境VS2005 选WIN32应用程序, 我从来不用MFC

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#include GL/GL.h

#include gl/GLU.h

#include gl/GLAux.h

#include math.h

#pragma comment(lib, "opengl32.lib")

#pragma comment(lib, "glu32.lib")

#pragma comment(lib, "glaux.lib")

#define MAX_LOADSTRING 100

//定义递归调用阀值,即其中最小三角形边长

#define SIDELENGHT (0.05)

// Global Variables:

HINSTANCE hInst; // current instance

TCHAR szTitle[MAX_LOADSTRING]; // The title bar text

TCHAR szWindowClass[MAX_LOADSTRING]; // the main window class name

//自定义全局变量

HGLRC g_hRC = NULL; //OpenGL 绘图上下文

HDC g_hDC = NULL; //设备上下文

HWND g_hWnd = NULL; //保存当前窗口句柄

//定义三角形顶点指针

typedef struct tagTRIANGLEPOINT

{

GLfloat tpPointX;

GLfloat tpPointY;

}TRIANGLEPOINT,*LTRIANGLEPOINT;

//定义最外面大三角形三个点

TRIANGLEPOINT g_TrianglePoint[3] = {{0.0, 0.0}, {5.0, 0.0}, {2.5,2.5}};

// Forward declarations of functions included in this code module:

ATOM MyRegisterClass(HINSTANCE hInstance);

BOOL InitInstance(HINSTANCE, int);

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM);

//自定义函数

void EnableOpenGL(HWND hWnd);

void SceneInit();

void SceneResizeViewport();

void DisableOpenGL();

void Display();

void DrawTriangle(LTRIANGLEPOINT pTrianglePoint, int iPointNum = 3);

void DrawLargeTriangle(LTRIANGLEPOINT pTrianglePoint, int iPointNum);

int APIENTRY _tWinMain(HINSTANCE hInstance,

HINSTANCE hPrevInstance,

LPTSTR lpCmdLine,

int nCmdShow)

{

UNREFERENCED_PARAMETER(hPrevInstance);

UNREFERENCED_PARAMETER(lpCmdLine);

// TODO: Place code here.

MSG msg;

HACCEL hAccelTable;

// Initialize global strings

LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);

LoadString(hInstance, IDC_OPENGLTRIANGLE, szWindowClass, MAX_LOADSTRING);

MyRegisterClass(hInstance);

// Perform application initialization:

if (!InitInstance (hInstance, nCmdShow))

{

return FALSE;

}

EnableOpenGL(g_hWnd);

SceneInit();

SceneResizeViewport();

hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_OPENGLTRIANGLE));

// Main message loop:

ZeroMemory(msg, sizeof(msg));

while ( msg.message != WM_QUIT )

{

if (PeekMessage(msg, NULL, 0U, 0U, PM_REMOVE))

{

if(!TranslateAccelerator(msg.hwnd, hAccelTable, msg))

{

TranslateMessage(msg);

DispatchMessage(msg);

}

}

else

{

Display();

SwapBuffers(g_hDC);

}

}

DisableOpenGL();

return (int) msg.wParam;

}

//

// FUNCTION: MyRegisterClass()

//

// PURPOSE: Registers the window class.

//

// COMMENTS:

//

// This function and its usage are only necessary if you want this code

// to be compatible with Win32 systems prior to the 'RegisterClassEx'

// function that was added to Windows 95. It is important to call this function

// so that the application will get 'well formed' small icons associated

// with it.

//

ATOM MyRegisterClass(HINSTANCE hInstance)

{

WNDCLASSEX wcex;

wcex.cbSize = sizeof(WNDCLASSEX);

wcex.style = CS_HREDRAW | CS_VREDRAW;

wcex.lpfnWndProc = WndProc;

wcex.cbClsExtra = 0;

wcex.cbWndExtra = 0;

wcex.hInstance = hInstance;

wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_OPENGLTRIANGLE));

wcex.hCursor = LoadCursor(NULL, IDC_ARROW);

wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);

wcex.lpszMenuName = MAKEINTRESOURCE(IDC_OPENGLTRIANGLE);

wcex.lpszClassName = szWindowClass;

wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

return RegisterClassEx(wcex);

}

//

// FUNCTION: InitInstance(HINSTANCE, int)

//

// PURPOSE: Saves instance handle and creates main window

//

// COMMENTS:

//

// In this function, we save the instance handle in a global variable and

// create and display the main program window.

//

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)

{

HWND hWnd;

hInst = hInstance; // Store instance handle in our global variable

hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,

CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

if (!hWnd)

{

return FALSE;

}

g_hWnd = hWnd;

ShowWindow(hWnd, nCmdShow);

UpdateWindow(hWnd);

return TRUE;

}

//

// FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)

//

// PURPOSE: Processes messages for the main window.

//

// WM_COMMAND - process the application menu

// WM_PAINT - Paint the main window

// WM_DESTROY - post a quit message and return

//

//

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

{

int wmId, wmEvent;

PAINTSTRUCT ps;

HDC hdc;

switch (message)

{

case WM_COMMAND:

wmId = LOWORD(wParam);

wmEvent = HIWORD(wParam);

// Parse the menu selections:

switch (wmId)

{

case IDM_ABOUT:

DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);

break;

case IDM_EXIT:

DestroyWindow(hWnd);

break;

default:

return DefWindowProc(hWnd, message, wParam, lParam);

}

break;

case WM_PAINT:

hdc = BeginPaint(hWnd, ps);

// TODO: Add any drawing code here...

EndPaint(hWnd, ps);

break;

case WM_DESTROY:

PostQuitMessage(0);

break;

default:

return DefWindowProc(hWnd, message, wParam, lParam);

}

return 0;

}

// Message handler for about box.

INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)

{

UNREFERENCED_PARAMETER(lParam);

switch (message)

{

case WM_INITDIALOG:

return (INT_PTR)TRUE;

case WM_COMMAND:

if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)

{

EndDialog(hDlg, LOWORD(wParam));

return (INT_PTR)TRUE;

}

break;

}

return (INT_PTR)FALSE;

}

//初始化opengl

void EnableOpenGL(HWND hWnd)

{

PIXELFORMATDESCRIPTOR pfd;

int iFormat;

g_hDC = GetDC(hWnd);

ZeroMemory(pfd, sizeof(pfd));

pfd.nSize = sizeof(pfd);

pfd.nVersion = 1;

pfd.dwFlags = PFD_DRAW_TO_WINDOW| PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;

pfd.iPixelType = PFD_TYPE_RGBA;

pfd.cColorBits = 32;

pfd.cDepthBits = 16;

pfd.iLayerType = PFD_MAIN_PLANE;

iFormat = ChoosePixelFormat( g_hDC, pfd );

SetPixelFormat( g_hDC, iFormat, pfd );

g_hRC = wglCreateContext(g_hDC);

wglMakeCurrent( g_hDC, g_hRC);

}

//设置着色模式

void SceneInit()

{

glShadeModel(GL_SMOOTH);

glClearColor(1.0, 1.0, 1.0, 0.5);

glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);

}

//设置视口

void SceneResizeViewport()

{

RECT rect;

int w,h;

GLfloat aspect;

GetClientRect( g_hWnd, rect );

w = rect.right - rect.left;

h =rect.bottom - rect.top;

aspect = (GLfloat)w/ (GLfloat)h;

glViewport(0,0,w,h);//设置视口

glMatrixMode(GL_PROJECTION);

glLoadIdentity();

gluOrtho2D(0.0, 5.0, 0.0, 5.0/aspect);

}

void DisableOpenGL(){

wglMakeCurrent(NULL, NULL);

wglDeleteContext(g_hRC);

ReleaseDC(g_hWnd, g_hDC);

}

void Display()

{

glClear(GL_COLOR_BUFFER_BIT);

glMatrixMode(GL_MODELVIEW);

glLoadIdentity();

DrawLargeTriangle(g_TrianglePoint, 3);

DrawTriangle(g_TrianglePoint, 3);

glFlush();

}

//画大三角形

void DrawLargeTriangle(LTRIANGLEPOINT pTrianglePoint, int iPointNum)

{

glBegin(GL_LINE_LOOP);

for ( int i = 0; i 3; ++i)

{

glColor3f(1.0,0.0,0.0);

glVertex2f(pTrianglePoint[i].tpPointX,pTrianglePoint[i].tpPointY);

}

glEnd();

}

//递归函数

void DrawTriangle(LTRIANGLEPOINT pTrianglePoint, int iPointNum)

{

//得到中间三角形的三个点

TRIANGLEPOINT trianglepoint[3];

for (int i = 0; i 3; ++i)

{

if ( i == 2)

{

trianglepoint[i].tpPointX = (pTrianglePoint[i].tpPointX + pTrianglePoint[0].tpPointX) / 2;

trianglepoint[i].tpPointY = (pTrianglePoint[i].tpPointY + pTrianglePoint[0].tpPointY) / 2;

}

else

{

trianglepoint[i].tpPointX = (pTrianglePoint[i].tpPointX + pTrianglePoint[i+1].tpPointX) / 2;

trianglepoint[i].tpPointY = (pTrianglePoint[i].tpPointY + pTrianglePoint[i+1].tpPointY) / 2;

}

}

glBegin(GL_LINE_LOOP);

for ( int i = 0; i 3; ++i)

{

glColor3f(1.0,0.0,0.0);

glVertex2f(trianglepoint[i].tpPointX,trianglepoint[i].tpPointY);

}

glEnd();

//构建其它三角

TRIANGLEPOINT trianglepoint1[3];

TRIANGLEPOINT trianglepoint2[3];

TRIANGLEPOINT trianglepoint3[3];

ZeroMemory(trianglepoint1, sizeof(trianglepoint1));

ZeroMemory(trianglepoint2, sizeof(trianglepoint2));

ZeroMemory(trianglepoint2, sizeof(trianglepoint2));

trianglepoint1[0] = pTrianglePoint[0];

trianglepoint1[1] = trianglepoint[0];

trianglepoint1[2] = trianglepoint[2];

trianglepoint2[0] = pTrianglePoint[1];

trianglepoint2[1] = trianglepoint[1];

trianglepoint2[2] = trianglepoint[0];

trianglepoint3[0] = pTrianglePoint[2];

trianglepoint3[1] = trianglepoint[2];

trianglepoint3[2] = trianglepoint[1];

//设定边界

if(pow(abs(trianglepoint1[0].tpPointX - trianglepoint1[1].tpPointX), 2)

+pow(abs(trianglepoint1[0].tpPointY - trianglepoint1[1].tpPointY), 2) SIDELENGHT)

DrawTriangle(trianglepoint1, iPointNum);

if(pow(trianglepoint2[0].tpPointX - trianglepoint2[1].tpPointX, 2)

+pow(trianglepoint2[0].tpPointY - trianglepoint2[1].tpPointY, 2) SIDELENGHT)

DrawTriangle(trianglepoint2, iPointNum);

if(pow(trianglepoint2[0].tpPointX - trianglepoint2[1].tpPointX, 2)

+pow(trianglepoint2[0].tpPointY - trianglepoint2[1].tpPointY, 2) SIDELENGHT)

DrawTriangle(trianglepoint3, iPointNum);

python阀值组大于返回结果小于返回结果啥意思

python阀值组大于返回结果小于返回结果啥意思简单阈值

对每一个像素都应用相同的阈值。如果像素值小于阈值，则将其设置为0，否则设置为最大值。

函数：

retval, dst=cv.threshold(src, thresh, maxval, type[, dst])对每个像素使用固定的阈值

参数：

src

输入图像 ，灰度图(多通道, 8-bit or 32-bit floating point).

dst

与src具有相同大小、类型和通道数的输出数组。

thresh

阈值

maxval

当像素值超过了阈值(或者小于阈值，根据type来决定)，所赋予的值

type

返回值：

retVal：使用的阈值，在Otsu‘s中会用到

dst： 经过阈值处理的图像


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