Tổng quan về lập trình GDI

Tổng quan về lập trình GDI

1 Giơi thiêu

,

2005

2

,

p

3.1 lơp DC

CWindowDC

CMetaFileDC

CDC -

sau

CDC* pDC = GetDC ();

// Do some drawing ReleaseDC (pDC);

CPaintDC -

void CMyView::OnPaint() {

CPaintDC dc(this);

dc.TextOut(0, 0, "for the display, not the printer"); OnDraw(&dc); // stuff that's common to display and

// printer

1

menu

}

CClientDC -

void CMainWindow::OnLButtonDown (UINT nFlags, CPoint point) {

CRect rect;

GetClientRect (&rect);

CClientDC dc (this);

dc.MoveTo (rect.left, rect.top);

dc.LineTo (rect.right, rect.bottom);

dc.MoveTo (rect.right, rect.top);

dc.LineTo (rect.left, rect.bottom);

}

CWindowDC -

,

CBitmap -

CFont -

c,

CPen -

,

CPalette -

CRgn -

,

4

4.1 o project

4.2 X

 COLORREF SetPixel(int x, int y, COLORREF color)

 COLORREF SetPixel(POINT point, COLORREF color)

 COLORREF GetPixel(int x, int y)

 COLORREF GetPixel(POINT point)

xxxTo

MoveTo

LineTo

Polyline

Arc

ArcTo

PolyBezier

PolyBezierTo

(100, 200)

void CTestGDIView::OnDraw(CDC* pDC) {

pDC->MoveTo(10, 10);

pDC->LineTo(200, 200);

}

#include <math.h>

#define SEGMENTS 100

#define PI 3.14159

void CTestGDIView::OnDraw(CDC* pDC) {

CRect rect;

GetClientRect (&rect);

int nWidth = rect.Width ();

int nHeight = rect.Height ();

CPoint aPoint[SEGMENTS];

for (int i=0; i<SEGMENTS; i++) { aPoint[i].x = (i * nWidth) / SEGMENTS;

aPoint[i].y = (int) ((nHeight / 2) * (1 - (sin ((2 * PI * i) / SEGMENTS))));

} pDC->Polyline (aPoint, SEGMENTS);

}

void CTestGDIView::OnDraw(CDC* pDC) {

POINT aPoint1[4] = { 120,100,120,200,250,150,500,40 };

POINT aPoint2[4] = { 120,100,50,350,250,200,500,40 };

pDC->PolyBezier (aPoint1, 4);

pDC->PolyBezier (aPoint2, 4);

}

Chord

Ellipse

Pie

Polygon

Rectangle

RoundRect

void CTestGDIView::OnDraw(CDC* pDC) {

pDC->Ellipse (0, 0, 150, 200); pDC->Rectangle (50, 50, 100, 150); }

CPen(

int nPenStyle, int nWidth, COLORREF crColor );

CPen(

int nPenStyle, int nWidth, const LOGBRUSH* pLogBrush, int nStyleCount = 0,

const DWORD* lpStyle = NULL );

V

void CTestGDIView::OnDraw(CDC* pDC)

{

CPen pen (PS_DASH, 4, RGB (255, 0, 0));

CPen* pOldPen = pDC->SelectObject (&pen); // pOldPen lưu

pDC->Ellipse (50, 50, 300, 200);

}

CBrush(

COLORREF crColor );

CBrush(

int nIndex, COLORREF crColor );

explicit CBrush(

CBitmap* pBitmap );

void CTestGDIView::OnDraw(CDC* pDC) {

CBrush brush (HS_DIAGCROSS, RGB (255, 0, 0)); pDC->SelectObject (&brush);

pDC->Rectangle (0, 0, 100, 100);

}