Windows Form Bai 5

7/29/2019 Windows Form Bai 5

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i Hc S Phm Tp. H Ch MinhKhoa Ton Tin Hc LP TRNH WINDOWS

Thvin ha GDI(Graphics Device Interface)

Trn Ngc Bo

Email: [email protected]

Lp trnh ha vi thvin GDI
mailto:[email protected]:[email protected]


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Tran Ngoc Bao 2 Dai hoc Su Pham TP.HCM

NI DUNG

X l skin OnDraw Draw Mode

Gii thiu Device Context

Cc i tngGDI Quan h gia cc i tng GDI, handle v Class MFC

Optaining DC

Sdng DC vi cc i tng GDI


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Device Context - DC

Device context

Cc i tng GDI

DC l mt i tng ca Windows lu tr thng tin chi tit v phn cng.

GDI cho php s dng ta logic v h thng mu RGB.

Device context (HDC)

Pen (HPEN): s dng vng thng, ng cong, ng trn, hcn, ellipse,..

Brush (HBRUSH): dng t hnh trn, HCN, Ellipse, polygon,..

Font (HFONT): s dng cho ch

Palette (HPALETTE): x dng qun l bng mu ca thit b

Bitmap (HBITMAP): s dng qun l hnh nh

Region ( HRGN): qun l cc vng i tng khng chnh tc


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Quan h gia GDI, handle v Class MFC

DC (HDC) : CDC, CClientDC, CWindowDC,

Pen (HPEN): CPen

Brush (HBRUSH): CBrush

Font (HFONT): CFont

Palette (HPALETTE): CPalette

Bitmap (HBITMAP): Cbitmap

Region ( HRGN): CRegion


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Optaining DC

Gi hm CWnd::GetDC()

Khai bo bin CClientDC dc(this), CClientDC c s dng v

cc i tng trong vng Client ca ca s

Khai bo bin CWindowDC dc(this), CWindowDC c s dng

v cc i tng trn ton ca s (client v none-client) Trong MFC, s dng CView::OnDraw() v cc i tng,

OnDraw s tng call khi ca s cn Update

Nu chng ta bit thng tin, chng ta c th to bin DC ring


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Sdng DC vi cc i tng GDI

T

o DC

v

cc

i t

ng To i tng GDI tng ng (Pen, Brush,)

Gn i tng GDI cho DC

Vi tng

Gn i tng DC c (trc khi chn i tng trong DC)

Hy cc i tng GDI to trong bc 2

Cc bc thc hin



Draw Mode

C php:int CDC::SetR2(nDrawStyle)

Ton t : XOR, AND, OR, NOT

Php ton XOR

A XOR B XOR B = A XOR (B XOR B) = A XOR 0 = A

A l mu gc, B l mu mi

Bng m t mode trong v

R2_xxxx:R2_XORPEN: P ^ O

R2_NOTXORPEN: ~ (P ^ O)

R2_COPYPEN: ~ O, mu ca Pen

R2_NOTCOPYPEN: ~ P ngc vi mu ca P

Trong P mu v, O l mu gc, B mu en, W mu trng

NOT : ~, AND &, OR |, XOR ^.



Pen - Bt v

To bt v

BOOL CPen::CreatePen(int nPenStyle, int nWidth, COLORREF color)

nPenStyle: PS_SOLID, PS_DASH, PS_DOT, PS_DASHDOT, PS_

DASHDOTDOT, PS_NULL,

nWidth: dy ca nt, nu style PS_SOLID th dy khng th vt qu 1

color: mu ca nt v, s dng Macro RGB()



Sdng bt v vng thng

X l skin MouseDown

void CGUISampleView::OnLButtonDown(UINT nFlags, CPoint point)

{

m_ptStart = point;

CView::OnLButtonDown(nFlags, point);

}

Yu cu:- Click chut tri ln vng Client chn im bt u P1 MouseDown

- Gi chut v di chuyn n im cui P2

- B click chut MouseUp

- Vng thng t v tr P1 n P2



Sdng bt v vng thng

X l skin MouseUpvoid CGUISampleView::OnMouseUpINT nFlags, CPoint point)

{

CClientDC dc(this);CPen pen, *ptrPenOld;

int nMode;

pen.CreatePen(PS_DOT,1,RGB(0,0,0));

ptrPenOld = dc.SelectObject(&pen);nMode = dc.SetROP2(R2_XORPEN);dc.MoveTo(m_ptStart);

dc.LineTo(m_ptEnd);

dc.SetROP2(nMode);

dc.SelectObject(ptrPenOld);}



Xl skin OnDraw

Skin OnDraw xy ra khi:- Hm Invalidate() c gi

- ng dng nhn c thng ip WM_PAINT yu cu v li mn hnh

X l skin OnDraw

- Khi gi hm Invalidate() hay ng dng nhn thng ip WM_PAINT, ton b ni

dung trong mn hnh ng dng s b xa. V vy cn phi v li ton b cc i

tng trn mn hnh

- Trong hm OnDraw: chng ta s thc hin v li ton b cc i tng trn mn

hnh



Xl skin OnDraw (tt)

void CGUISampleView::OnDraw(CDC* pDC){

CGUISampleDoc* pDoc = GetDocument();

ASSERT_VALID(pDoc);

// TODO: add draw code for native data here

CPen pen, *ptrPenOld;int nMode;

//To bt v

pen.CreatePen(PS_SOLID,1,RGB(255,0,0));

ptrPenOld = pDC->SelectObject(&pen);

//Set Mode v

nMode = pDC->SetROP2(R2_COPYPEN);

//V ng thng

pDC->MoveTo(m_ptStart);

pDC->dc.LineTo(m_ptEnd);//Gii phng bt v

pDC->SetROP2(nMode);//Set li mode c

pDC->SelectObject(ptrPenOld);

}



Brush - Chi t

To Brush

BOOL CBrush::CreateSolidBrush(COLORREF color)

To chi t c vi mu l Color

BOOL CBrush::CreateHatchBrush(int style, COLORREF color)

To chi t c kiu style vi mu l Color

BOOL CBrush::CreatePatternBrush(Cbitmap *bmp)

To chi t c kiu bitmap



Sdng bt v v hnh chnht

X l skin MouseDown

void CGUISampleView::OnLButtonDown(UINT nFlags, CPoint point)

{

m_ptStart = point;

CView::OnLButtonDown(nFlags, point);

}

Yu cu:- Click chut tri ln vng Client chn im bt u P1 MouseDown

- Gi chut v di chuyn n im cui P2

- B click chut MouseUp

- V hnh ch nht tim P1 (left,top) n P2 (right, bottom)



Sdng bt v v hnh chnht

X l skin MouseUpvoid CGUISampleView::OnMouseUpINT nFlags, CPoint point)

{

CClientDC dc(this);

CPen pen, *ptrPenOld;

int nMode;

pen.CreatePen(PS_DOT,1,RGB(0,0,0));

ptrPenOld = dc.SelectObject(&pen);

nMode = dc.SetROP2(R2_XORPEN);

CBrush brush;

CBrush *ptrBrushOld;brush.CreateSolidBrush(RGB(0,255,0));

ptrBrushOld = pDC->SelectObject(&brush);

CRect r(m_ptStart.x,m_ptStart.y, m_ptEnd.x,m_ptEnd.y);

pDC->Rectangle(r);

dc.SetROP2(nMode);//Set lai mode

dc.SelectObject(ptrPenOld);

pDC->SelectObject(ptrBrushOld);

brush.Detach();

}



Cc i tng GDI khc

Chn v di chuyn i tng

Bitmap

Cc i tng khc RoundRect

Pie

Polygon

Curve

FloodFill Pattern Brush

Font



RoundRect

C phpBOOL CDC::RoundRect(CRect r,CPoint p);

p.y

p.x

(r.left,r.top)

(r.right,r.bottom)



RoundRect (tt)

void CDrawingView::DrawFocusRect(CDC *pDC){


int nMode;


ptrPenOld = pDC->SelectObject(&pen);

CBrush brush;

CBrush *ptrBrushOld;

brush.CreateHatchBrush(HS_DIAGCROSS,RGB(255,255,0));

ptrBrushOld = pDC->SelectObject(&brush);nMode = pDC->SetROP2(R2_COPYPEN);

CRect rect = CRect(5,385,300,535);

pDC->RoundRect(&rect,CPoint(40,10));pDC->SetROP2(nMode);//Set lai mode

pDC->SelectObject(ptrPenOld);pDC->SelectObject(ptrBrushOld);

brush.Detach();

}



RoundRect (tt)



PIE

C php

BOOL CDC::Pie(LPCRECT lpRect,CPoint ptStart,CPoint ptEnd);

ptStart

lpRect

ptEnd



PIE (tt)

void CTNBDrawingView::OnPie(){

CClientDC dc(this);


int nMode;



CBrush brush;



ptrBrushOld = dc.SelectObject(&brush);

nMode = dc.SetROP2(R2_COPYPEN);

dc.Pie(CRect(100,50,500,300),CPoint(10,50),CPoint(200,50));dc.SetROP2(nMode);//Set lai mode

dc.SelectObject(ptrPenOld);dc.SelectObject(ptrBrushOld);

brush.Detach();

}



PIE (tt)


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Polygon


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Polygon

C php

BOOL CDC::Polygon(LPPOINT lpPoints,int nCount);

P[0]

P[1]

P[2]

P[3]

P[4]

P[5]

P[6]


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Polygon

C phpBOOL CDC::Polygon(LPPOINT lpPoints,int nCount);

P[0]

P[1]

P[2]

P[3]P[4]

P[5]

P[6]

pDC->Polygon(P,7);


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Polygon (tt)


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Polygon

C phpBOOL CDC::Polygon(LPPOINT lpPoints,int nCount);

P[0]

P[1]

P[2]

P[3]P[4]

P[5]

P[6]

pDC->Polygon(P,6);


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Polygon (tt)

void CDrawingView::OnPOLYGON(){

CClientDC dc(this);

CPoint pts[7];

pts[0] = CPoint(300,20); pts[1] = CPoint(400,100); pts[2] = CPoint(550,100);

pts[3] = CPoint(550,300); pts[4] = CPoint(50,300); pts[5] = CPoint(50,100);pts[6] = CPoint(200,100);

CPen pen, *ptrPenOld; int nMode;



CBrush brush, *ptrBrushOld; CBitmap bmp;


ptrBrushOld = dc.SelectObject(&brush);


dc.Polygon(pts,5);



dc.SelectObject(ptrBrushOld);

}


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Curve

C phpBOOL CDC::PolyBezier(LPPOINT lpPoints,int nCount);

Cn t nht 4 im vng cong


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Curve

void CDrawingView::OnPOLYGON(){

CClientDC dc(this);

CPoint pts[7];

pts[0] = CPoint(300,20); pts[1] = CPoint(400,100); pts[2] = CPoint(550,100);pts[3] = CPoint(550,300); pts[4] = CPoint(50,300); pts[5] = CPoint(50,100);

pts[6] = CPoint(200,100);





dc.PolyBezier(pts,4);



}


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Curve


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Curve


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FloodFill

C phpBOOL CDC::FloodFill(int x,int y, COLORREF clrBoder);

(x, y) (x, y)

pDC->FloodFill(x, y,RGB(0,0,255));


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FloodFill (tt)

void CDrawingView::OnRButtonDown(UINT nFlags, CPoint point)

{

// TODO: Add your message handler code here and/or call default

CClientDC dc(this);CBrush brush;


brush.CreateSolidBrush(RGB(127,127,127));ptrBrushOld = dc.SelectObject(&brush);

dc.FloodFill(point.x,point.y,RGB(255,0,255));


CView::OnRButtonDown(nFlags, point);

}


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P tt B h


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Pattern Brushvoid CTNBDrawingView::OnPatternFill()

{

CClientDC dc(this);

CPoint pts[7];


pen.CreatePen(PS_SOLID,3,RGB(255,0,255));ptrPenOld = dc.SelectObject(&pen);

CBrush brush, *ptrBrushOld;

CBitmap bmp;

bmp.LoadBitmap(IDB_BITMAP4);

brush.CreatePatternBrush(&bmp);ptrBrushOld = dc.SelectObject(&brush);


dc.Polygon(pts,6);

dc.SetROP2(nMode);//Set lai mode cu



brush.Detach();

}


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TO I TNG FONT


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TO I TNG FONT

C phpBOOL CFont::CreateFont

(

int nHeight,

int nWidth,

int nEscapement,

int nOrientation,

int nWeight,

BYTE bItalic,BYTE bUnderline,

BYTE cStrikeOut,

BYTE nCharSet,

BYTE nOutPrecision, BYTE nClipPrecision, BYTE nQuality,BYTE nPitchAndFamily, LPCTSTR lpszFacename

);

BOOL CFont::CreateFontIndirect(const LOGFONT *lpLogFont);


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LY FONT HIN HNH TRONG DC

CFont* CDC::GetCurrentFont();

C php

V dCGDIDoc::CGDIDoc()

{

LOGFONT lf;

CClientDC dc(NULL);

CFont *ptrFt;

ptrFt=dc.GetCurrentFont();

ptrFt->GetLogFont(&lf);

ASSERT(m_fontDraw.CreateFontIndirect(&lf));m_colorFont=RGB(0, 0, 0);

m_bTransparentBgd=TRUE;

}


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LY KT QU THP THOI CFontDialog

void CCDBDoc::OnFontdialogboxInitialize()

{

LOGFONT lf;

CFontDialog dlg; if(dlg.DoModal() == IDOK)

{

color=dlg.GetColor();

szStr.Format("Font Color: R=%d, G=%d, B=%d",

GetRValue(color), GetGValue(color), GetBValue(color));

szStr+="\nFace Name: ";

szStr+=dlg.GetFaceName();

if(dlg.IsItalic() == TRUE)szStr+="\nFont is italic";

if(dlg.IsUnderline() == TRUE)szStr+="\nFont is underlined";

if(dlg.IsStrikeOut() == TRUE)szStr+="\nFont is strike out";

if(dlg.IsBold())szStr+="\nFont is bolded";AfxMessageBox(szStr);

}

}

SETFONT CHO EDIT TEXT T KT QU CF Di l


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SETFONT CHO EDIT TEXT TKT QU CFontDialog

void CSetFontTextBoxDlg::OnSetfont()

{

CFontDialog dlg; LOGFONT lf; CFont *pFont;

if (dlg.DoModal() == IDOK) {

dlg.GetCurrentFont(&lf);

pFont = new CFont;if(!pFont->CreateFontIndirect(&lf))

{

delete pFont;return;

}

CEdit *myEdit;myEdit = (CEdit*)GetDlgItem(IDC_EDIT1);

myEdit->SetWindowText(lf.lfFaceName);

myEdit->SetFont(pFont);

m_clrColor = dlg.GetColor();

myEdit->RedrawWindow();

if(pFont!=NULL)delete pFont;

}

}


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HIN TH VN BN VI CFONT


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HIN TH VN BN VI CFONT

void CGDIView::OnDraw(CDC* pDC){

CFont *ptrFt; CFont *ptrFtOld; CRect rect; LOGFONT logFont;

CGDIDoc* pDoc=GetDocument(); ASSERT_VALID(pDoc);

ptrFt=pDoc->GetCurrentFont();

ASSERT(ptrFt != NULL);if(ptrFt->GetSafeHandle() != NULL)

{

ptrFt->GetLogFont(&logFont);

ptrFtOld=pDC->SelectObject(ptrFt);

pDC->SetTextColor(pDoc->GetFontColor());

pDC->SetBkMode(pDoc->GetBgdStyle() ? TRANSPARENT:OPAQUE);

pDC->SetBkColor((pDoc->GetFontColor())&0x00FFFFFF);

}

GetClientRect(rect);pDC->TextOut(rect.Width()/4, rect.Height()/4, logFont.lfFaceName);

if(ptrFt->GetSafeHandle() != NULL)pDC->SelectObject(ptrFtOld);

}


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Windows Form Bai 5

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