shpreaderview.cpp

读取shp文件源码。

/*
读取ShapeFile格式
工程:ShpReader
作者:醍醐灌顶
创建时间：星期一,四月,04,2005
*/
// ShpReaderView.cpp : implementation of the CShpReaderView class
//

#include "stdafx.h"
#include "ShpReader.h"

#include "ShpReaderDoc.h"
#include "ShpReaderView.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CShpReaderView

IMPLEMENT_DYNCREATE(CShpReaderView, CScrollView)

BEGIN_MESSAGE_MAP(CShpReaderView, CScrollView)
	//{{AFX_MSG_MAP(CShpReaderView)
		// NOTE - the ClassWizard will add and remove mapping macros here.
		//    DO NOT EDIT what you see in these blocks of generated code!
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CScrollView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CScrollView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CScrollView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CShpReaderView construction/destruction

CShpReaderView::CShpReaderView()
{
	// TODO: add construction code here

}

CShpReaderView::~CShpReaderView()
{
}

BOOL CShpReaderView::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CScrollView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CShpReaderView drawing

void CShpReaderView::OnDraw(CDC* pDC)
{
	CShpReaderDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	if(pDoc->xmin != -1)
	{
		CRect rect;
		GetClientRect(rect);
		pDC->SetMapMode(MM_ISOTROPIC);
		pDC->SetWindowExt((int)(pDoc->xmax-pDoc->xmin),(int)(pDoc->ymax-pDoc->ymin));
		pDC->SetViewportExt(rect.right,-rect.bottom);
		pDC->SetWindowOrg(pDoc->xmin,pDoc->ymin);
		pDC->SetViewportOrg(0,rect.bottom);
		DrawPolygons(pDC);
		DrawPolyLines(pDC);
		DrawPoints(pDC);
	}
}

void CShpReaderView::OnInitialUpdate()
{
	CScrollView::OnInitialUpdate();

	CSize sizeTotal;
	// TODO: calculate the total size of this view
	sizeTotal.cx = sizeTotal.cy = 100;
	SetScrollSizes(MM_TEXT, sizeTotal);
}

/////////////////////////////////////////////////////////////////////////////
// CShpReaderView printing

BOOL CShpReaderView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CShpReaderView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CShpReaderView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CShpReaderView diagnostics

#ifdef _DEBUG
void CShpReaderView::AssertValid() const
{
	CScrollView::AssertValid();
}

void CShpReaderView::Dump(CDumpContext& dc) const
{
	CScrollView::Dump(dc);
}

CShpReaderDoc* CShpReaderView::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CShpReaderDoc)));
	return (CShpReaderDoc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CShpReaderView message handlers

void CShpReaderView::DrawPoints(CDC *pDC)
{
	CShpReaderDoc *pDoc = GetDocument();
	if(pDoc->pointV.size() > 0)
	{
		vector<ShpPoint>::iterator it = pDoc->pointV.begin();
		while(it != pDoc->pointV.end())
		{
			pDC->SetPixel(it->x,it->y,RGB(0,0,255));
			it ++;
		}
	}
}

void CShpReaderView::DrawPolyLines(CDC *pDC)
{
	CShpReaderDoc *pDoc = GetDocument();
	if(pDoc->polylineV.size() > 0)
	{
		CPen  pen(PS_SOLID,2,RGB(0,255,0));
		CPen *oldpen = pDC->SelectObject(&pen);
		vector<ShpPolyLine>::iterator it = pDoc->polylineV.begin();
		while(it != pDoc->polylineV.end())
		{
			for(int i=0;i<it->partnum;i++)
			{
				if(i == (it->partnum-1))
				{
					int pos = it->parts[i];
					Point *p = it->points+pos;
					if(p)
						pDC->MoveTo(p->x,p->y);
					pos ++;
					p = it->points + pos;
					while(pos < it->pointnum)
					{
						pDC->LineTo(p->x,p->y);
						pos ++;
						p = it->points + pos;
					}
				}
			}
			it ++;
		}
		pDC->SelectObject(oldpen);
	}
}

void CShpReaderView::DrawPolygons(CDC *pDC)
{
	CShpReaderDoc *pDoc = GetDocument();
	if(pDoc->polygonV.size() > 0)
	{
		CPen  pen(PS_SOLID,2,RGB(255,0,0));
		CPen *oldpen = pDC->SelectObject(&pen);
		vector<ShpPolygon>::iterator it = pDoc->polygonV.begin();
		while(it != pDoc->polygonV.end())
		{
			for(int i=0;i<it->partnum;i++)
			{
				if(i == (it->partnum-1))
				{
					int pos = it->parts[i];
					Point *p = it->points+pos;
					if(p)
						pDC->MoveTo(p->x,p->y);
					pos ++;
					p = it->points + pos;
					while(pos < it->pointnum)
					{
						pDC->LineTo(p->x,p->y);
						pos ++;
						p = it->points + pos;
					}
				}
				else
				{
					int iStart,iEnd,pos;
					iStart = it->parts[i];
					iEnd = it->parts[i+1];
					pDC->MoveTo(it->points[iStart].x,it->points[iStart].y);
					for(pos = (iStart+1);pos<iEnd;pos++)
					{
						pDC->LineTo(it->points[pos].x,it->points[pos].y);
					}
				}
			}
			it ++;
		}
		pDC->SelectObject(oldpen);
	}
}