graphicview.cpp

学生成绩查询系统.帮忙大家学生和提升对VC++的学生和认识.

// GraphicView.cpp : implementation file
//

#include "stdafx.h"
#include "Student.h"
#include "StudentDoc.h"
#include "GraphicView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CGraphicView

IMPLEMENT_DYNCREATE(CGraphicView, CView)

CGraphicView::CGraphicView()
{
}

CGraphicView::~CGraphicView()
{
}


BEGIN_MESSAGE_MAP(CGraphicView, CView)
	//{{AFX_MSG_MAP(CGraphicView)
		// NOTE - the ClassWizard will add and remove mapping macros here.
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CGraphicView drawing

void CGraphicView::OnDraw(CDC* pDC)
{
	CStudentDoc* pDoc = (CStudentDoc*)GetDocument();
	// TODO: add draw code here
	if (pDoc->m_studentlist.GetnStudent() && (pDoc->m_Period >= 0 && pDoc->m_Period <= 4))
	{
		float average = pDoc->m_studentlist.Average(pDoc->m_Period);
		float stddev = pDoc->m_studentlist.StdDev(pDoc->m_Period);
		PlotStatistics(pDC, average, stddev);
		XY* pXY = pDoc->m_studentlist.Distribution(pDoc->m_Period);
		PlotHistogram(pDC, pXY);
		delete pXY;
	}
}

/////////////////////////////////////////////////////////////////////////////
// CGraphicView diagnostics

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

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

#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CGraphicView message handlers

// 绘制统计参数之函数
void CGraphicView::PlotStatistics(CDC* pDC, float average, float stddev)
{
	CStudentDoc* pDoc = (CStudentDoc*)GetDocument();
	ASSERT_VALID(pDoc);

	// 根据阶段号显示不同的阶段名
	CString period;
	switch (pDoc->m_Period)
	{
	case EXERCISE:
		period = "平时作业";
		break;
	case REPORT:
		period = "实验报告";
		break;
	case MIDTERM:
		period = "期中考试";
		break;
	case TERMINAL:
		period = "期末考试";
		break;
	case MARK:
		period = "总评成绩";
		break;
	}

	// 绘制统计参数
	CRect rc;
	GetClientRect(rc);
	rc.DeflateRect(10, 10, 5, 10);
	int height = (rc.bottom - rc.top) / 15;
	rc.bottom = rc.top + height;
	CString str = "统计结果（" + period + "）";
	pDC->DrawText(str, rc, DT_CENTER|DT_VCENTER|DT_SINGLELINE);
	rc.top = rc.bottom;
	rc.bottom = rc.top + height;
	str.Format("平均分数：%6.2f        标准偏差：%6.2f", average, stddev);
	pDC->DrawText(str, rc, DT_CENTER|DT_VCENTER|DT_SINGLELINE);
}

// 绘制成绩分布直方图之函数
void CGraphicView::PlotHistogram(CDC* pDC, XY* xy)
{
	int ymax = 0, i, j = 0, k = 10;
	for (i = 0; i < 10; i ++)
	{
		if (xy[i].y > ymax)
			ymax = xy[i].y;
	}
	for (i = 0; i < 10; i ++)
	{
		if (xy[i].y == 0)
			j ++;
		else
			break;
	}
	for (i = 9; i >= 0; i --)
	{
		if (xy[i].y == 0)
			k --;
		else
			break;
	}
	CRect rc;
	GetClientRect(rc);
	rc.DeflateRect(10, 100, 5, 40);
	int nSegWidth = rc.Width() / (k - j);
	int nSegHeight = rc.Height() / ymax;
	COLORREF crSeg = RGB(0, 0, 192);
	CBrush brush1(HS_FDIAGONAL, crSeg);
	CBrush brush2(HS_FDIAGONAL, crSeg);
	CPen pen(PS_INSIDEFRAME, 2, crSeg);
	CBrush* oldBrush = pDC->SelectObject(&brush1);
	CPen* oldPen = pDC->SelectObject(&pen);
	CRect rcSeg(rc);
	rcSeg.right = rcSeg.left + nSegWidth;
	CString strSeg[] = {"0~10", "10~20", "20~30", "30~40", "40~50", "50~60", "60~70", "70~80", "80~90", "90~100" };
	CRect rcStr;
	for (i = j; i < k; i ++)
	{
		if (i % 2)
			pDC->SelectObject(&brush2);
		else
			pDC->SelectObject(&brush1);
		rcSeg.top = rcSeg.bottom - xy[i].y * nSegHeight - 2;
		pDC->Rectangle(rcSeg);
		if (xy[i].y > 0)
		{
			CString str;
			str.Format("%d人", xy[i].y);
			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);
	}
	pDC->SelectObject(oldBrush);
	pDC->SelectObject(oldPen);
}