mfc_Paint_2 - 8BitsCoding/RobotMentor GitHub Wiki

직선, 네모 그리기

라디오 버튼을 통해서 자유선 그리기, 직선 그리기, 네모 그리기 인지 지정할 수 있게 변경하자.

// Dlg.h
CButton m_pen_radio;
CButton m_line_radio;
CButton m_rect_radiao;

// OnInitDialog()
m_pen_radio.SetCheck(1);

// OnClickPEN
m_draw_wnd.SetDrawType(PEN_MODE);

// OnClickLINE
m_draw_wnd.SetDrawType(LINE_MODE);

// OnClickRECT
m_draw_wnd.SetDrawType(RECT_MODE);

// DrawWnd.h

#define PEN_MODE
#define LINE_MODE
#define RECT_MODE

private:
    char m_draw_type = 1;       // 1-연필 / 2-선 / 3-사각형

public:
    void SetDrawType(char a_type) {
        m_draw_type = a_type;
    }

// DrawWnd::MOUSE_MOVE
if(m_is_clicked == 1) {
    CClientDC dc(this);

    if(m_draw_type == PEN_MODE) {
        HDC h_image_dc = m_image.GetDC();
        CDC * p_image_dc = CDC::FromHandle(h_image_dc);
        p_image_dc.MoveTo(m_prev_point);        // 시작 점
        p_image_dc.LineTo(point);               // 끝 점
        m_prev_point = point;
        m_image.ReleaseDC();
        m_image.Draw(dc, 0, 0);
    } else if(m_draw_type == LINE_MODE) {
        m_image.Draw(dc, 0, 0);
        dc.MoveTo(m_prev_point);        // 시작 점
        dc.LineTo(point);               // 끝 점
    } else if(m_draw_type == RECT_MODE) {
        m_image.Draw(dc, 0, 0);

        CGdiObject *p_old_brush = dc.SelectStockObject(NULL_BRUSH);
        dc.Rectangle(m_prev_point.x, m_prev_point.y, point.x, point.y);
        dc.SelectObject(p_old_brush);
    } else {

    }


}
else {

}

// LBUTTON UP
if(m_is_clicked) {
    if(m_draw_type == LINE_MODE) {
        CDC * p_image_dc = CDC::FromHandle(m_image_GetDC());
        p_image_dc->MoveTo(m_prev_point);
        p_image_dc->LineTo(point);
        p_image.ReleaseDC();
    } else if (m_draw_type == RECT_MODE) {
        CDC * p_image_dc = CDC::FromHandle(m_image_GetDC());
        CGdiObject *p_old_brush = p_image_dc->SelectStockObject(NULL_BRUSH);
        p_image_dc->Rectangle(m_prev_point.x, m_prev_point.y, point.x, point.y);
        p_image_dc->SelectObject(p_old_brush);
        p_image.ReleaseDC();
    }
    m_is_clicked = 0;
    ReleaseCapture();
}

---

선과 네모를 그릴때 깜빡임을 제거하고 싶다면??

private:
    CImage m_image, m_temp_image;

m_temp_image를 추가

// OnCreate
CRect r;
GetClientRect(r);

m_image.Create(r.Width(), r.Height(), 32);
m_temp_image.Create(r.Width(), r.Height(), 32);

CDC * p_image_dc = CDC::FromHandle(m_image.GetDC());
p_image_dc->Rectangle(r);
m_image.ReleaseDC();

// DrawWnd::MOUSE_MOVE
if(m_is_clicked == 1) {
    CClientDC dc(this);

    if(m_draw_type == PEN_MODE) {
        HDC h_image_dc = m_image.GetDC();
        CDC * p_image_dc = CDC::FromHandle(h_image_dc);
        p_image_dc.MoveTo(m_prev_point);        // 시작 점
        p_image_dc.LineTo(point);               // 끝 점
        m_prev_point = point;
        m_image.ReleaseDC();
        m_image.Draw(dc, 0, 0);
    } else if(m_draw_type == LINE_MODE) {
        CDC * p_temp_dc = CDC::FromHandle(m_temp_image.GetDC());

        m_image.Draw(*p_temp_dc, 0, 0);

        p_temp_dc->MoveTo(m_prev_point);        // 시작 점
        p_temp_dc->LineTo(point);               // 끝 점
        m_temp_image.ReleaseDC();
        m_temp_image.Draw(dc, 0, 0);
    } else if(m_draw_type == RECT_MODE) {
        CDC * p_temp_dc = CDC::FromHandle(m_temp_image.GetDC());

        m_image.Draw(*p_temp_dc, 0, 0);

        CGdiObject *p_old_brush = p_temp_dc->SelectStockObject(NULL_BRUSH);
        p_temp_dc->Rectangle(m_prev_point.x, m_prev_point.y, point.x, point.y);
        p_temp_dc->SelectObject(p_old_brush);

        m_temp_image.ReleaseDC();
        m_temp_image.Draw(dc, 0, 0);
    } else {

    }


}
else {

}