Рисование линейки

void DrawRuler(HDC hdc, RECT *prc)
{
    static int iRuleSize[16] = {360, 72, 144, 72, 216, 72, 144, 72,
                                288, 72, 144, 72, 216, 72, 144, 72};
 
    int i, j;
    POINT ptClient;
 
    SaveDC(hdc);
 
    SetMapMode(hdc, MM_ANISOTROPIC);
    SetWindowExtEx(hdc, 1440, 1440, NULL);
    SetViewportExtEx(hdc, GetDeviceCaps(hdc, LOGPIXELSX),
                    GetDeviceCaps(hdc, LOGPIXELSY), NULL);
 
 
    SetWindowOrgEx(hdc, -720, -720, NULL);
 
    ptClient.x = prc->right;
    ptClient.y = prc->bottom;
    DPtoLP(hdc, &ptClient, 1);
    ptClient.x -= 360;
 
    MoveToEx(hdc, 0, -360, NULL);
    LineTo(hdc, ptClient.x, -360);
    MoveToEx(hdc, -360, 0, NULL);
    LineTo(hdc, -360, ptClient.y);
 
    for(i = 0, j = 0;i <= ptClient.x;i += 1440/16, j++)
    {
        MoveToEx(hdc, i, -360, NULL);
        LineTo(hdc, i, -360 - iRuleSize[j%16]);
    }
 
    for(i = 0,j = 0; i <= ptClient.y;i += 1440/16, j++)
    {
        MoveToEx(hdc, -360, i, NULL);
        LineTo(hdc, -360 - iRuleSize[j%16],i);
    }
 
    RestoreDC(hdc, -1);
 
}