MFC扩展编程实例圆环嵌套图表创建与标签位置设置
当前例程创建一个圆环的嵌套类型的图表，并可以点击界面按钮设置其标签位置，效果如下图。
例程是基于一套MFC扩展库，可以在网站搜索下载。
下面是实现过程。
首先创建基于单文档的工程，class CMy123View : public CBCGPFormView。
并在默认的对话框资源中添加一图片控件，修改其ID为IDC_CHART，用于显示图表。
在视窗类中添加图表变量CBCGPChartCtrl m_wndChart;
并添加虚函数Create，初始化图表。
- BOOL CMy123View::Create(LPCTSTR lpszClassName, LPCTSTR lpszWindowName, DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID, CCreateContext* pContext)
- {
- BOOL bRst = CBCGPFormView::Create(lpszClassName, lpszWindowName, dwStyle, rect, pParentWnd, nID, pContext);;
- //获取图表指针;
- m_wndChart.SubclassDlgItem(IDC_CHART,this);
- CBCGPChartVisualObject* pChart = m_wndChart.GetChart();
- pChart->SetChartType(BCGPChartDoughnutNested);//圆环嵌套图表类型;
- pChart->SetThemeOpacity(70);//图表透明度;
- int nTotalYears = 3;
- CString sName;
- //创建数据系列，添加数据;
- for (int nYear = 0; nYear < nTotalYears; nYear++)
- {
- pChart->AddChartData(_T("产品 A"), Rand(10000, 50000), nYear);
- pChart->AddChartData(_T("产品 B"), Rand(10000, 50000), nYear);
- pChart->AddChartData(_T("产品 C"), Rand(10000, 50000), nYear);
- pChart->AddChartData(_T("产品 D"), Rand(10000, 50000), nYear);
- pChart->AddChartData(_T("产品 E"), Rand(10000, 50000), nYear);
- pChart->AddChartData(_T("产品 F"), Rand(10000, 50000), nYear);
- pChart->AddChartData(_T("产品 G"), Rand(10000, 50000), nYear);
- sName.Format(_T("第 %d年"),nTotalYears - nYear - 1);
- pChart->SetSeriesName(sName, nYear);
- }
- //添加添加到布局管理器统一管理布局;
- if (GetLayout() == NULL)
- return bRst;
- CBCGPStaticLayout* pLayout = (CBCGPStaticLayout*)GetLayout();
- if (pLayout == NULL)
- return bRst;
- pLayout->AddAnchor(m_wndChart.GetDlgCtrlID(), CBCGPStaticLayout::e_MoveTypeNone, CBCGPStaticLayout::e_SizeTypeBoth);
- //
- return bRst;
- }
- inline double Rand (double dblStart, double dblFinish)
- {
- double minVal = min(dblStart, dblFinish);
- double maxVal = max(dblStart, dblFinish);
- return (maxVal - minVal) * (double)rand() / (RAND_MAX + 1) + minVal;
- }
pChart->SetChartType(BCGPChartDoughnutNested);//圆环嵌套图表类型;
最后是添加按钮控件，调车图表标签属性。
- void CMy123View::OnBnClickedButton1()
- {
- static int nIndex=0;
- CBCGPChartVisualObject* pChart = m_wndChart.GetChart();
- ASSERT_VALID(pChart);
- BCGPChartDataLabelOptions dataLabelOptions = pChart->GetDataLabelOptions();
- dataLabelOptions.m_position = (BCGPChartDataLabelOptions::LabelPosition)nIndex;//标签位置;
- dataLabelOptions.m_bUnderlineDataLabel = TRUE;
- dataLabelOptions.m_bDrawDataLabelBorder = \
- dataLabelOptions.m_position != BCGPChartDataLabelOptions::LP_DEFAULT_POS \
- && dataLabelOptions.m_position != BCGPChartDataLabelOptions::LP_OUTSIDE_END;
- dataLabelOptions.m_content = BCGPChartDataLabelOptions::LC_PERCENTAGE;
- pChart->SetDataLabelsOptions(dataLabelOptions);
- //
- for (int i = 0; i < pChart->GetSeriesCount(); i++)
- {
- CBCGPChartPieSeries* pSeries = DYNAMIC_DOWNCAST(CBCGPChartPieSeries, pChart->GetSeries(i));
- ASSERT_VALID(pSeries);
- pSeries->SetDefaultFillGradientType(CBCGPBrush::BCGP_GRADIENT_BEVEL);//设置渐变模式;
- pSeries->SetTileCaption(CBCGPChartPieSeries::CHART_TILE_POSITION_TOP);
- CBCGPChartDoughnutSeries* pDoughnutSeries = DYNAMIC_DOWNCAST(CBCGPChartDoughnutSeries, pSeries);
- ASSERT_VALID(pDoughnutSeries);
- pDoughnutSeries->SetDoughnutPercent(30);
- }
- nIndex++;
- if(nIndex>4)
- pChart->ShowDataLabels(false);//隐藏数据标签;
- else
- pChart->ShowDataLabels(true);
- pChart->Redraw();
- //
- nIndex = nIndex>4?0:nIndex;
- }
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