Windows Form Bai 6

7/29/2019 Windows Form Bai 6

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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

TM HIU NG DNG PAINT

Chn i tngDi chuyn i tng

Lu trcc i tng

V cc i tng trong GDI Line

Rectangle

Circle


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TM HIU NG DNG PAINT

Chn i tng

Di chuyn i tng

Lu trcc i tng


Rectangle Circle


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VI TNG

Demo chuong trinh Paint


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TM HIU NG DNG PAINT

Chn i tng

Di chuyn i tng

Lu trcc i tng


Rectangle Circle


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CHN I TNG



CHN I TNG - NG THNG

V mt ton hc- on thng c to bi 2 im P(xP,yP),Q(xQ,yQ)

- Gi M(xM, yM) l v tr ca chut

Chn ng thng tng ng vi vic di chuyn chut v click ln ng thng PQTa M ca chut nm trn ng thng PQ hay M PQ

P(xP,yP)

Q(xQ,yQ)

M(xM,yM)

P(xP,yP)

Q(xQ,yQ)



V mt ton hc

- Phng trnh chnh tc ng thng PQ

P

Q

CHN I TNG - NG THNG

QP

P

QP

P

yy

yy

xx

xx

=

Ax + By + C = 0

A = yP yQB = xQ xPC = xP*yQ xQ*yP



V mt ton hc- Phng trnh chnh tc ng thng PQ

CHN I TNG - NG THNG

Ax + By + C = 0 (d)A = yP yQB = xQ xPC = xP*yQ xQ*yP

P

Q

M

Ta M ca chut nm trn ng thng PQ hay M PQKhong cch t M n PQ bng 0

022

=

+

++

BA

CByAxMM



V mt ton hc- M thuc on PQ M tha 3 iu kin sau

CHN I TNG - NG THNG

P

QM

022

=

+

++

BA

CByAx MM

xP xM xQ

yP yM yQ

Vi Ax + By + C = 0 (d)

l phng trnh ng thng qua 2 im PQ



Ci t chng trnh- M thuc on PQ M tha 3 iu kin sau

CHN I TNG - NG THNG

P

Q

M

022 =+

++

BA

CByAx MM

xmin

xM

xmaxymin yM ymax

Vi

- Ax + By + C = 0 (d)l phng trnh ng thng qua 2 im PQ

- xmin = min(xP,xQ), xmax = max(xP,xQ)

- ymin = min(yP,yQ), ymax = max(yP,yQ)

P

Q

M



CHN NG THNG - DEMO H s A, B, C ca phng trnh ng thng PQ

void CGDISampleView::LineEquation(CPoint point1, CPoint point2,long &A, long &B,

long &C)

{

A = Q.y - P.y;B = P.x - Q.x;

C = (long)P.y*Q.x - (long)P.x*Q.y;

}

int CGDISampleView::LineDistance(CPoint M, CPoint P, CPoint Q)

{

long A,B,C;

LineEquation(P,Q,A,B,C);

double kc = abs(A*M.x+B*M.y+C)/sqrt(A*A+B*B);

return int(kc);

}

Khong cch tim M n ng thng PQ

Ax + By + C = 0 (d)

A = yP yQB = xQ xPC = xP*yQ xQ*yP

022

=

+

++

BA

CByAx MM



CHN NG THNG - DEMO Kim tra iu kin M PQ

BOOL CGDISampleView::Between(CPoint M, CPoint P, CPoint Q)

{

const constDist = 5;

int x1,y1,x2,y2;x2 = max(P.x,Q.x) + constDist;

x1 = min(P.x,Q.x);

y2 = max(P.y,Q.y) + constDist;

y1 = min(P.y,Q.y);if ((M.x=x1)&&(M.y=y1))

return true;

return false;

}

xmin xM xmax

ymin yM ymax

Vi

- xmin = min(xP,xQ), xmax = max(xP,xQ)

- ymin = min(yP,yQ), ymax = max(yP,yQ)



CHN NG THNG - DEMO

Kim tra im M PQBOOL CGDISampleView::ContainsInBorder(CPoint M, CPoint P, CPoint Q)

{

const constDist = 5;

if ((Between(M,P,Q)) && (LineDistance(M,P,Q)



CHN NG THNG - DEMO

V hnh ch nht ti im P

V hnh ch nht ti im Q



CHN NG THNG - DEMOvoid CGDISampleView::ShowSelectedLine(CPoint point)

{

CClientDC dc(this);

CRect *ptrRect;

const WIDTH = 4;

int nOldMode = dc.SetROP2(R2_NOTXORPEN);

CGdiObject *pOldBrush = dc.SelectStockObject(NULL_BRUSH);

//Ve 2 dau cua diem chon

CPoint p1,p2;

p1 = ptrRect->TopLeft();

p2 = ptrRect->BottomRight();

dc.Rectangle(p1.x-WIDTH,p1.y-WIDTH,p1.x+WIDTH,p1.y+WIDTH);

dc.Rectangle(p2.x-WIDTH,p2.y-WIDTH,p2.x+WIDTH,p2.y+WIDTH);

dc.SelectObject(pOldBrush);

dc.SetROP2(nOldMode);

dc.MoveTo(ptrRect->TopLeft());

dc.LineTo(ptrRect->BottomRight());

}



CHN HNH CHNHT RNG



CHN HNH CHNHT RNG

V mt ton hcA

D C

B

M

- Kim tra im M AB

- Kim tra im M BC- Kim tra im M CD

- Kim tra im M DA

A

D

C

B

M



CHN HNH TRN

V mt ton hc

M(XM,YM)

O(XO,YO)

R

Phng trnh ng trn (C) tm O bn knh R

(x - xo)2 + (y yo)2 = R2 (c)

M thuc ng trn (C)

ta im M(xM,yM) tha phng trnh (C)

(xM - xo)2 + (yM yo)2 = R2 (c)



CHN HNH TRN

Ci t chng trnh

M(XM,YM)

O(XO,YO)

R


(x - xo)2 + (y yo)2 = R2 (c)

M thuc ng trn (C)


R2 - (xM - xo)2 + (yM yo)2 R2 +



CHN HNH CHNHT C T MU

A

D C

B

M

xA xM xC

yA yM yC

A

D

C

B

M

Lm th no xc nh c im Mnm trong HCN ny hay khng ?



CHN HNH TRN C T MU

M(XM,YM)

O(XO,YO)

R


(x - xo)2 + (y yo)2 = R2 (c)

M thuc ng trn (C)


(xM - xo)2 + (yM yo)2 < R2 (c)


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CHN HNH TRN C T MU

Ci t chng trnh

M(XM,YM)

O(XO,YO)

R


(x - xo)2 + (y yo)2 = R2 (c)

M thuc ng trn (C)


(xM - xo)2 + (yM yo)2 R2 +


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CHN A GIC BT K C T MU

a gic li a gic lm

M

M

M

M

M


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a gic li

M

M

K

K

M

M

L

L

K

K

- iu kin M nm trong a gic ?

- iu kin M nm ngoi a gic ?

C 1 giao im

C 1 giao im

C 2 giao im

C 2 giao im


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a gic lm

M

M

M

K

M

C 1 giao im

C 0 giao im

MC 4 giao im

C 4 giao im

C 3 giao im

M

M

C 0 giao im

- iu kin Mnm trong agic ?

- iu kin Mnm ngoi a

gic ?


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M

M

M

M

M

- iu kin M nm trong a gic s giao im ca ng

thng k tM n cc cnh ca a gi l mt s l: 1, 3, 5,..

- iu kin M nm ngoi a gic s giao im ca ngthng k tM n cc cnh ca a gi l mt s chn: 0, 2, 4,


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XC NH GIAO IM GIA 2 NGTHNG

K

(d1): A1x + B1y + C1 = 0

(d2): A2x + B2y + C2 = 0Giao im ca (d1) v (d2) lnghim ca h phng trnh


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TM HIU NG DNG PAINT


Lu trcc i tng


Rectangle Circle


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DI CHUYN I TNG - NG THNG

Di chuyn ng thng AB thc cht l php tnh tin 2 imAB: A A

B B

A

B

A

B


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DI CHUYN I TNG PHP TNH TIN

void TRANSLATION(CPoint &Destination,CPoint Source,int dx,int dy)

{

Destination.x=Source.x+dx;Destination.y=Source.y+dy;

}

A(xA,yA)

A(xA,yA)

dx

dy

xA = xA + dx

yA = yA + dy


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void CGDISampleView::MoveSelectedObject(CPoint point)

{

CRect *ptrRect;

ptrRect = pDoc->GetLine(m_nLineSel);

//Xa ng c

dc.MoveTo(ptrRect->TopLeft());

dc.LineTo(ptrRect->BottomRight());

//Tnh tin n v tr mi

int dx, dy;

dx = -m_ptStartSel.x + point.x;

dy = -m_ptStartSel.y + point.y;

ptrRect->top = ptrRect->top + dy; ptrRect->left = ptrRect->left + dx;

ptrRect->bottom = ptrRect->bottom + dy; ptrRect->right = ptrRect->right + dx;

//Vng midc.MoveTo(ptrRect->TopLeft()); dc.LineTo(ptrRect->BottomRight());

m_ptStartSel = point;

}

DI CHUYN I TNG - NG THNG


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DI CHUYN I TNG - NG TRN

Di chuyn ng trn tm O bn knh R thc cht l tnh tintm O n v tr O

O(xo,yo)O(xo,yo)


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DI CHUYN I TNG

Di chuyn hnh chnht

Di chuyn a gic


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DI CHUYN I TNG CI T CHNG TRNH

X l skin MouseDown

X l skin MouseMove

X l skin MouseUp

- Chn i tng t v tr ca chut

- Ly ta im u (ta ca chut)

- Tnh tin i tng n v tr hin hnh ca chut

- Xa i tng c

- Vi tng mi

- Cp nht cc thuc tnh (ta ) ca i tng

- Gi hm Invalidate pht sinh s kin OnDraw


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TM HIU NG DNG PAINT


Lu trcc i tng


Rectangle Circle


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QUN L LU TRI TNG

CShape

CRectangleCLine

Class CShape : public CObject{

};

S lp i tng

Class CLine : public CShape

{

};

Class CRectangle : public CShape

{

};


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QUN L LU TRI TNG

s dng kiu d liu CTypedPtrList phi thm vo tp tin Stdafx.h th vinsau:

#include

Class CGDISampleDoc : public CDocument

{

CTypedPtrList m_aSO;

void Add(CShape &obj);

};

void CGDISampleDoc::Add(CShape &obj){

CShape *temp;

obj.DuplicateObject(temp);

m_aSO.AddTail(temp);

}


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QUN L LU TRI TNG

void CGDISampleView::OnDraw(CDC* pDC){

CTNBPaintDoc* pDoc = GetDocument();

ASSERT_VALID(pDoc);

//V cc i tng: Line, Rectange

POSITION pos=pDoc->m_aSO.GetHeadPosition();

while (pos != NULL)

{

CShape *myobj = pDoc->m_aSO.GetNext(pos);

myobj->Show(pDC,R2_COPYPEN);

}

}

Lm th no myobj gi hm Show tng ng ca tng i tng:CShape, Cline, CRectangle,?


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LP I TNG CShape

class CShape : public CObject

{

public:

BOOL m_bFilled; // Doi tuong co duoc to hay khong

int m_nPenWidth; // Be rong cua but ve

int m_nPenStyle; // Kieu but ve (SOLID,DOT,DASH,...)COLORREF m_BrushColor; // Mau to

COLORREF m_PenColor; // Mau duong bao

int m_nPattern; //Pattern cua doi tuong

CShape();

virtual ~CShape();

};

Thuc tnh i tng Shape

h


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class CShape : public CObject

{

public:virtual void Draw(CDC * pDC);

virtual void DuplicateObject(CShape * & pObj);

virtual void Fill(CDC * pDC);

public:

void Show(CDC * pDC, int nDrawMode);

void operator =(CShape &s);

CShape();virtual ~CShape();

};

LP I TNG CShape

Cc hm ca lp CShape

LP I TNG CSh


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LP I TNG CShape

Cc hm ca lp CShapevoid CShape::DuplicateObject(CShape *&pObj)

{

pObj=new CShape();

pObj->operator=(*this);

}

void CShape::operator =(CShape & s)

{

m_BrushColor = s.m_BrushColor;

m_bFilled = s.m_bFilled;

m_PenColor = s.m_PenColor;

m_nPenStyle = s.m_nPenStyle;m_nPenWidth = s.m_nPenWidth;

m_nPattern=s.m_nPattern;

}

LP I TNG CSh


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LP I TNG CShape

Cc hm ca lp CShapeCShape::CShape()

{

m_PenColor = RGB(0,0,0);m_BrushColor = RGB(0,128,0);

m_nPenStyle = PS_SOLID;

m_nPenWidth = 1;

m_bFilled = false;

m_nPattern=HS_SOLID;

}

void CShape::Draw(CDC *pDC)

{

}void CShape::Fill(CDC *pDC)

{

}

LP I TNG CLi


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LP I TNG CLine

Cc thnh phn ca lp CLineclass CLine : public CShape

{

public:

CPoint point2;

CPoint point1;

public:

void Draw(CDC * pDC);void operator =(CLine &l);

void DuplicateObject(CShape*& pObj);

void SetPoint(int nIndex, CPoint p);

CLine();CLine(CPoint p1,CPoint p2);

virtual ~CLine();

};

LP I TNG CLi


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LP I TNG CLine

Cc thnh phn ca lp CLineCLine::CLine()

{

m_PenColor = RGB(255,0,0);

m_BrushColor = RGB(0,128,0);

m_nPenStyle = PS_SOLID;

m_nPenWidth = 2;

m_bFilled = false;

m_nPattern=HS_SOLID;

}

CLine::CLine(CPoint p1,CPoint p2)

{

point1 = p1;

point2 = p2;

}


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LP I TNG CLi


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LP I TNG CLine

Cc thnh phn ca lp CLinevoid CLine::Draw(CDC *pDC)

{

//Tao mot pen moiCPen newPen(m_nPenStyle,m_nPenWidth,m_PenColor);

CPen *pOldPen = pDC->SelectObject(&newPen);

//Ve duong thangpDC->MoveTo(point1.x,point1.y);

pDC->LineTo(point2.x,point2.y);

pDC->SelectObject(pOldPen);

}

LP I TNG CR t l


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LP I TNG CRectangle

Cc thnh phn ca lp CRectangleclass CRectangle : public CShape{

public:

CPoint point2;

CPoint point1;

public:

void operator =(CRectangle & l);void DuplicateObject(CShape * & pObj);

void Draw(CDC * pDC);

void SetPoint(int nIndex, CPoint p);CRectangle();

virtual ~CRectangle();

};

LP I TNG CR t l


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LP I TNG CRectangle

Cc thnh phn ca lp CRectanglevoid CRectangle::operator =(CRectangle & l)

{

CShape::operator =(l);point1=l.point1;

point2=l.point2;

}

void CRectangle::DuplicateObject(CShape * & pObj)

{

//Ham tao mot doi tuong moipObj=new CRectangle();

((CRectangle*)pObj)->operator=(*this);

}

LP I TNG CR t l


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LP I TNG CRectangle

Cc thnh phn ca lp CRectangle

void CRectangle::Draw(CDC * pDC)

{

CPen newPen(m_nPenStyle,m_nPenWidth,m_PenColor);

CPen *pOldPen = pDC->SelectObject(&newPen);

//Ve hinh chu nhat

pDC->Rectangle(point1.x,point1.y,point2.x,point2.y);

pDC->SelectObject(pOldPen);

}

void CRectangle::Fill(CDC * pDC)

{

}

TO CC I TNG


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TO CC I TNG

To & vng thng CLinevoid CGDISampleView::OnLine()

{

CGDISampleDoc* pDoc = GetDocument();

CPoint point1(100,100);


line.SetPoint(1,point1);

line.SetPoint(2,point2);pDoc->Add(line);

Invalidate();

}


{



};

TO CC I TNG


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TO CC I TNG

To & v hnh chnht CRectangle


{



};

void CGDISampleView::OnRectangle()

{

CGDISampleDoc * pDoc = GetDocument();CPoint point1(300,300);


rectangle.SetPoint(1,point1);

rectangle.SetPoint(2,point2);pDoc->Add(rectangle);

Invalidate();

}

TM HIU NG DNG PAINT


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TM HIU NG DNG PAINT

Chn i tng

Di chuyn i tng Lu trcc i tng


Rectangle

Circle

Cc x l khc Resize

Cut, Copy, Paste


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Cc thao tc khc Resize


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Cc thao tc khc - Resize



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Windows Form Bai 6

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Transcript of Windows Form Bai 6