www.pudn.com > VCYXSJRM.rar > canvasFrame.cpp

// canvasFrame.cpp : implementation file 
// 
 
#include "stdafx.h" 
#include "canvasr.h" 
#include "canvasFrame.h" 
 
#ifdef _DEBUG 
#define new DEBUG_NEW 
#undef THIS_FILE 
static char THIS_FILE[] = __FILE__; 
#endif 
 
///////////////////////////////////////////////////////////////////////////// 
// canvasFrame 
 
IMPLEMENT_DYNCREATE(canvasFrame, CFrameWnd) 
 
CPen newPen,*oldPen; 
canvasFrame::canvasFrame() 
{ 
	RECT rect; 
	Create(NULL,"绘图窗口"); 
	CClientDC dc(this); 
	int width = dc.GetDeviceCaps(HORZRES); 
	int height = dc.GetDeviceCaps(VERTRES); 
	GetWindowRect( &rect ); 
	width = ( width - ( rect.right - rect.left ))/2 ; 
	height = (height - (rect.bottom - rect.top ))/2 ; 
	MoveWindow( width , height , (rect.right - rect.left ) , (rect.bottom - rect.top ) ,true); 
	newPen.CreatePen(PS_DASH,5,RGB(0,0,255)); 
} 
 
canvasFrame::~canvasFrame() 
{ 
} 
 
 
BEGIN_MESSAGE_MAP(canvasFrame, CFrameWnd) 
	//{{AFX_MSG_MAP(canvasFrame) 
	ON_WM_PAINT() 
	//}}AFX_MSG_MAP 
END_MESSAGE_MAP() 
 
///////////////////////////////////////////////////////////////////////////// 
// canvasFrame message handlers 
 
void canvasFrame::OnPaint()  
{ 
	CPaintDC dc(this);      //建立响应WM_PAINT消息的DC 
	oldPen=dc.SelectObject(&newPen);  //选择新画笔 
	int i,j=11,ptype,x=100,y=10; 
	dc.MoveTo(x,y);     //设定线段起点为(x,y) 
	for(i=0;i<=19;i++) 
	{ 
		ptype = i % 4;  //判断点的类型 
		switch(ptype) 
		{ 
		case 0:         //右上角的点 
			j=j-2; 
			x = x + 40 * j; 
			y = y; 
			break; 
		case 1:         //右下角的点 
			x = x; 
			y = y + 40 * j; 
			break; 
		case 2:         //左下角的点 
			x = x - (j - 1) * 40; 
			y = y; 
			break; 
		case 3:         //左上角的点 
			x = x; 
			y = y - (j -1 ) * 40; 
			break; 
		} 
		dc.LineTo(x,y); //绘制直线至(x,y)，(x,y)为下一线段的起点 
	} 
	dc.SelectObject(oldPen);       //重设回旧画笔 
}