Opengl 2D Angle Movement

[Xillez]

Hey, I made a program for 2D Angle Movement.

Now the user sets the degrees the triangle should move and it does, but it doesn't go correctly.

0 degrees is to the right of the window.

It started in the center of the window and went down left... as far as I know that isn't 180 degrees. It's more like 225 degrees.

why does it do this?

Here's the code:

#include <windows.h>
#include <gl/gl.h>
#include "math.h"
 
int wWidth = 1080;
int wHeight = 720;
 
LRESULT CALLBACK WindowProc(HWND, UINT, WPARAM, LPARAM);
void EnableOpenGL(HWND hwnd, HDC*, HGLRC*);
void DisableOpenGL(HWND, HDC, HGLRC);
 
 
int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nCmdShow)
{
    WNDCLASSEX wcex;
    HWND hwnd;
    HDC hDC;
    HGLRC hRC;
    MSG msg;
    BOOL bQuit = FALSE;
    float theta = 0.0f;
 
    /* register window class */
    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style = CS_OWNDC;
    wcex.lpfnWndProc = WindowProc;
    wcex.cbClsExtra = 0;
    wcex.cbWndExtra = 0;
    wcex.hInstance = hInstance;
    wcex.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
    wcex.lpszMenuName = NULL;
    wcex.lpszClassName = "GLSample";
    wcex.hIconSm = LoadIcon(NULL, IDI_APPLICATION);;
 
 
    if (!RegisterClassEx(&wcex))
        return 0;
 
    /* create main window */
    hwnd = CreateWindowEx(0,
                          "GLSample",
                          "OpenGL Sample",
                          WS_OVERLAPPEDWINDOW,
                          GetSystemMetrics(SM_CXSCREEN)/2-wWidth/2,
                          GetSystemMetrics(SM_CYSCREEN)/2-wHeight/2,
                          wWidth,
                          wHeight,
                          NULL,
                          NULL,
                          hInstance,
                          NULL);
 
    ShowWindow(hwnd, nCmdShow);
 
    /* enable OpenGL for the window */
    EnableOpenGL(hwnd, &hDC, &hRC);
 
    /* program main loop */
    while (!bQuit)
    {
        /* check for messages */
        if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
        {
            /* handle or dispatch messages */
            if (msg.message == WM_QUIT)
            {
                bQuit = TRUE;
            }
            else
            {
                TranslateMessage(&msg);
                DispatchMessage(&msg);
            }
        }
        else
        {
            /* OpenGL animation code goes here */
 
            glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
            glClear(GL_COLOR_BUFFER_BIT);
 
            //GLint con = 10;
            int moveDeg = 180.0 - 90.0;
 
            if (moveDeg == 0)
            {
                moveDeg = 360.0;
            }
            //GLfloat amountX = cos(moveDeg)/100.0;
            //GLfloat amountY = sin(moveDeg)/100.0;
 
            Sleep(100);
 
            glPushMatrix();
                glBegin(GL_TRIANGLES);
                    glColor3f(0.0f, 1.0f, 0.0f);   glVertex2f( 0.0,    0.05f);
                    glColor3f(0.0f, 1.0f, 0.0f);   glVertex2f( 0.05f, -0.05f);
                    glColor3f(0.0f, 1.0f, 0.0f);   glVertex2f(-0.05f, -0.05f);
                glEnd();
            glPopMatrix();
            //Move
            glTranslatef(cos(moveDeg)/100, sin(moveDeg)/100, 0.0f);
            SwapBuffers(hDC);
        }
    }
 
    /* shutdown OpenGL */
    DisableOpenGL(hwnd, hDC, hRC);
 
    /* destroy the window explicitly */
    DestroyWindow(hwnd);
 
    return msg.wParam;
}
 
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
        case WM_CLOSE:
            PostQuitMessage(0);
        break;
 
        case WM_DESTROY:
            return 0;
 
        case WM_KEYDOWN:
        {
            switch (wParam)
            {
                case VK_ESCAPE:
                    PostQuitMessage(0);
                break;
            }
        }
        break;
 
        default:
            return DefWindowProc(hwnd, uMsg, wParam, lParam);
    }
 
    return 0;
}
 
void EnableOpenGL(HWND hwnd, HDC* hDC, HGLRC* hRC)
{
    PIXELFORMATDESCRIPTOR pfd;
 
    int iFormat;
 
    /* get the device context (DC) */
    *hDC = GetDC(hwnd);
 
    /* set the pixel format for the DC */
    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 = 24;
    pfd.cDepthBits = 16;
    pfd.iLayerType = PFD_MAIN_PLANE;
 
    iFormat = ChoosePixelFormat(*hDC, &pfd);
 
    SetPixelFormat(*hDC, iFormat, &pfd);
 
    /* create and enable the render context (RC) */
    *hRC = wglCreateContext(*hDC);
 
    wglMakeCurrent(*hDC, *hRC);
}
 
void DisableOpenGL (HWND hwnd, HDC hDC, HGLRC hRC)
{
    wglMakeCurrent(NULL, NULL);
    wglDeleteContext(hRC);
    ReleaseDC(hwnd, hDC);
}