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C-/C++-Quelltext

class smallrect
{
private:

    RECT    rect_to_draw;

    const static int s_width  = 10;
    const static int s_height = 10;

    int i_mcolor_r;
    int i_mcolor_g;
    int i_mcolor_b;

public:

    void RandomColor();
    
    void CalculateRect();

    static void Draw_small_rect();

    static void Delete_small_rect();
};

C-/C++-Quelltext

void smallrect::CalculateRect()
{
    RECT    mainrect;                               //Rect für den Clientbereich

    
    GetClientRect(hWnd,&mainrect);                  //Größe des Clientbereich holen

    
    int i_xPosition = random(0,mainrect.right);     //einen x-Wert aus der Breite des Clientbereich generieren

    int i_yPosition = random(0,mainrect.bottom);    //einen y-Wert aus der Höhe des Clientbereich generieren

    
    rect_to_draw.top        = i_yPosition;
    rect_to_draw.left       = i_xPosition;
    rect_to_draw.bottom     = i_yPosition - s_height;
    rect_to_draw.right      = i_xPosition - s_width;
}

void smallrect::Draw_small_rect()
{
    HDC hDC = GetDC(hWnd);
    
    smallrect s_rc;
    
    s_rc.RandomColor();
    s_rc.CalculateRect();
    
    HBRUSH hBR = CreateSolidBrush(RGB(s_rc.i_mcolor_r,s_rc.i_mcolor_g,s_rc.i_mcolor_b));

    FillRect(hDC,&s_rc.rect_to_draw,hBR);

    DeleteObject(hBR);
    ReleaseDC(hWnd,hDC);
}

void smallrect::Delete_small_rect()
{   
    smallrect s_rc;
    
    POINTS  points = MAKEPOINTS(lParam);

    if(points.x > s_rc.rect_to_draw.left && points.x < s_rc.rect_to_draw.right && points.y > s_rc.rect_to_draw.bottom && points.y > s_rc.rect_to_draw.top)    {
        HDC hDC = GetDC(hWnd);
        RECT rc;
        GetClientRect(hWnd,&rc);
        FillRect(hDC,&rc,CreateSolidBrush(RGB(255,255,255)));
        ReleaseDC(hWnd,hDC);
    }       

}