ex_drawview.cpp

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// Ex_DrawView.cpp : implementation of the CEx_DrawView class
//

#include "stdafx.h"
#include "Ex_Draw.h"

#include "Ex_DrawDoc.h"
#include "Ex_DrawView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CEx_DrawView

IMPLEMENT_DYNCREATE(CEx_DrawView, CView)

BEGIN_MESSAGE_MAP(CEx_DrawView, CView)
	//{{AFX_MSG_MAP(CEx_DrawView)
		// 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, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CEx_DrawView construction/destruction

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

}

CEx_DrawView::~CEx_DrawView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CEx_DrawView drawing

void CEx_DrawView::OnDraw(CDC* pDC)
{
	CEx_DrawDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	float fScore[] = {66,82,79,74,86,82,67,60,45,44,77,98,65,90,66,76,66,
					62,83,84,97,43,67,57,60,60,71,74,60,72,81,69,79,91,69,71,81};
	DrawScore(pDC, fScore, sizeof(fScore)/sizeof(float));
}

/////////////////////////////////////////////////////////////////////////////
// CEx_DrawView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CEx_DrawView diagnostics

#ifdef _DEBUG
void CEx_DrawView::AssertValid() const
{
	CView::AssertValid();
}

void CEx_DrawView::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

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

/////////////////////////////////////////////////////////////////////////////
// CEx_DrawView message handlers

void CEx_DrawView::DrawScore(CDC *pDC, float *fScore, int nNum)
// fScore是成绩数组指针，nNum是学生人数
{
	int nScoreNum[] = { 0, 0, 0, 0, 0};			// 各成绩段的人数的初始值
	// 下面是用来统计各分数段的人数
	for (int i=0; i<nNum; i++)
	{
		int nSeg = (int)(fScore[i]) / 10;	// 取数的"十"位上的值
		if (nSeg < 6)	nSeg = 5;			// <60分
		if (nSeg == 10 ) nSeg = 9;			// 当为100分，算为>90分数段
		nScoreNum[nSeg - 5] ++;				// 各分数段计数
	}
	int nSegNum = sizeof(nScoreNum)/sizeof(int);	// 计算有多少个分数段

	// 求分数段上最大的人数
	int nNumMax = nScoreNum[0];					
	for (i=1; i<nSegNum; i++)
	{
		if (nNumMax < nScoreNum[i]) nNumMax = nScoreNum[i];
	}
	
	CRect rc;
	GetClientRect(rc);
	rc.DeflateRect( 40, 40 );				// 缩小矩形大小

	int nSegWidth = rc.Width()/nSegNum;		// 计算每段的宽度
	int nSegHeight = rc.Height()/nNumMax;	// 计算每段的单位高度

	COLORREF crSeg = RGB(0,0,192);			// 定义一个颜色变量

	CBrush brush1( HS_FDIAGONAL, crSeg );
	CBrush brush2( HS_BDIAGONAL, crSeg );
	CPen   pen( PS_INSIDEFRAME, 2, crSeg );

	CBrush* oldBrush = pDC->SelectObject( &brush1 );	// 将brush1选入设备环境
	CPen* oldPen = pDC->SelectObject( &pen );			// 将pen选入设备环境

	CRect rcSeg(rc);
	rcSeg.right = rcSeg.left + nSegWidth;		// 使每段的矩形宽度等于nSegWidth
	CString strSeg[]={"<60","60-70","70-80","80-90",">=90"};
	CRect rcStr;
	for (i=0; i<nSegNum; i++)
	{
		// 保证相邻的矩形填充样式不相同
		if (i%2) 
			pDC->SelectObject( &brush2 );	
		else
			pDC->SelectObject( &brush1 );	

		rcSeg.top = rcSeg.bottom - nScoreNum[i]*nSegHeight - 2;	// 计算每段矩形的高度
		pDC->Rectangle(rcSeg);

		if (nScoreNum[i] > 0)
		{
			CString str;
			str.Format("%d人", nScoreNum[i]);
			pDC->DrawText( str, rcSeg, DT_CENTER | DT_VCENTER | DT_SINGLELINE );
		}
		rcStr = rcSeg;
		rcStr.top = rcStr.bottom + 2;
		rcStr.bottom += 20;
		pDC->DrawText( strSeg[i], rcStr, DT_CENTER | DT_VCENTER | DT_SINGLELINE );

		rcSeg.OffsetRect( nSegWidth, 0 );		// 右移矩形
	}

	pDC->SelectObject( oldBrush );			// 恢复原来的画刷属性
	pDC->SelectObject( oldPen );			// 恢复原来的画笔属性

}