绘制图形

#include <windows.h>
#include <gl/GL.h>
#include <gl/GLU.h>

#pragma comment(lib,"opengl32.lib")
#pragma comment(lib,"glu32.lib")

void DraeScene() {
    glClear(GL_COLOR_BUFFER_BIT);  //清除背景颜色

    glPointSize(30.0f);    //设置点大小
    glEnable(GL_POINT_SMOOTH);    //圆点

    //画点
    glBegin(GL_POINTS);    //开始绘制
    glColor4ub(200, 0, 0, 255);
    glVertex3f(0, 0, -100.0f);
    glEnd();          //结束绘制



    //画线
    glLineWidth(4.0f);    //线的粗细
    glBegin(GL_LINES);

    glColor4ub(200, 0, 0, 255);
    glVertex3f(0, 0, -100.0f);
    glColor4ub(0, 200, 0, 255);
    glVertex3f(50.0f, 0, -100.0f);

    glVertex3f(0, 50.0f, -100.0f);
    glVertex3f(50.0f, 0, -100.0f);

    glVertex3f(0, 50.0f, -100.0f);
    glVertex3f(0, 0, -100.0f);

    glEnd();


    //
    glBegin(GL_TRIANGLES);

    glVertex3f(0, 0, -100.0f);
    glVertex3f(0, -30.0f, -100.0f);
    glVertex3f(-30.0f, 0, -100.0f);

    glEnd();

}

LRESULT CALLBACK RenderWindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
    switch (msg) {
    case WM_CLOSE:
        PostQuitMessage(0);
        break;
    }
    return DefWindowProc(hwnd, msg, wParam, lParam);
}

INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPSTR lpCmdLine, _In_ int nShowCmd) {
    WNDCLASSEX wndClass;
    wndClass.cbClsExtra = 0;
    wndClass.cbSize = sizeof(WNDCLASSEX);
    wndClass.cbWndExtra = 0;
    wndClass.hbrBackground = NULL;
    wndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
    wndClass.hIcon = NULL;
    wndClass.hIconSm = NULL;
    wndClass.hInstance = hInstance;
    wndClass.lpfnWndProc = (WNDPROC)RenderWindowProc;
    wndClass.lpszClassName = L"OpenGLWindow";
    wndClass.lpszMenuName = NULL;
    wndClass.style = CS_HREDRAW | CS_VREDRAW;

    ATOM atom = RegisterClassEx(&wndClass);

    //创建窗口
    HWND hwnd = CreateWindowEx(NULL, L"OpenGLWindow", L"OpenGL Render Window", WS_OVERLAPPEDWINDOW, 100, 100, 800, 600, NULL, NULL, hInstance, NULL);

    //创建OpenGl渲染窗口
    HDC dc = GetDC(hwnd);
    PIXELFORMATDESCRIPTOR pfd;
    memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR));
    pfd.nVersion = 1;
    pfd.dwFlags = PFD_DOUBLEBUFFER | PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_TYPE_RGBA;
    pfd.iLayerType = PFD_MAIN_PLANE;
    pfd.iPixelType = PFD_TYPE_RGBA;
    pfd.cColorBits = 32;
    pfd.cDepthBits = 24;
    pfd.cStencilBits = 8;
    int pixelFormateID = ChoosePixelFormat(dc, &pfd);

    SetPixelFormat(dc, pixelFormateID, &pfd);

    HGLRC rc = wglCreateContext(dc);
    wglMakeCurrent(dc, rc);

    glClearColor(41.0f / 255.0f, 71.0f / 255.0f, 121.0f / 255.0f, 1.0f);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(50.0f, 800.0f / 600.0f, 0.1f, 1000.0f);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

    ShowWindow(hwnd, SW_SHOW);
    UpdateWindow(hwnd);

    MSG msg;

    while (true) {
        if (PeekMessage(&msg, NULL, NULL, NULL, PM_REMOVE)) {
            if (msg.message == WM_QUIT) {
                break;
            }
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
        DraeScene();
    

        SwapBuffers(dc);     //交换前景与背景缓冲
    }

    return 0;
}

其中图形绘制部分：

glClear(GL_COLOR_BUFFER_BIT);  //清除背景颜色

glPointSize(30.0f);    //设置点大小
glEnable(GL_POINT_SMOOTH);    //圆点

                          //画点
glBegin(GL_POINTS);    //开始绘制
glColor4ub(200, 0, 0, 255);
glVertex3f(0, 0, -100.0f);
glEnd();          //结束绘制


//画线
glLineWidth(4.0f);    //线的粗细
glBegin(GL_LINES);

glColor4ub(200, 0, 0, 255);
glVertex3f(0, 0, -100.0f);
glColor4ub(0, 200, 0, 255);
glVertex3f(50.0f, 0, -100.0f);

glVertex3f(0, 50.0f, -100.0f);
glVertex3f(50.0f, 0, -100.0f);

glVertex3f(0, 50.0f, -100.0f);
glVertex3f(0, 0, -100.0f);

glEnd();


//画三角形
glBegin(GL_TRIANGLES);

glVertex3f(0, 0, -100.0f);
glVertex3f(0, -30.0f, -100.0f);
glVertex3f(-30.0f, 0, -100.0f);

glEnd();

转载于:https://www.jianshu.com/p/b13a97ad05e2