更改 MSChart 背景进行打印

Question

我已输入代码来在打印时更改 MSCharting 区域颜色。

chart.ChartAreas[o].BackColor = System.Drawing.Color.White;
chart.Printing.PrintPreview();

我的问题是，在用户选择“打印”或“关闭”打印预览对话框后，或者单击对话框“X”后，如何处理颜色变回原始颜色。

事实上，如果我使用 PrintDialog，一旦打印完成或取消，如何将背景设置回正常状态？

Answer 1

有点晚了，但我希望它能帮助别人。

对于 MsChart 打印，我正在使用 PrintDocument 事件。 BeginPrint 事件用于设置打印颜色，PrintPage 事件用于打印本身，EndPrint 事件用于在打印前设置颜色。

示例代码：

 public GraphFrm()
  {
     InitializeComponent();

     //new PrintDocument object to reset default one
     chart.Printing.PrintDocument = new System.Drawing.Printing.PrintDocument();
     //set up events
     chart.Printing.PrintDocument.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(PrintDocument_PrintPage);
     chart.Printing.PrintDocument.BeginPrint +=new System.Drawing.Printing.PrintEventHandler(PrintDocument_BeginPrint);
     chart.Printing.PrintDocument.EndPrint += new System.Drawing.Printing.PrintEventHandler(PrintDocument_EndPrint);
     //default print setting like margins and landscape
     chart.Printing.PrintDocument.DefaultPageSettings.Margins.Bottom = 50;
     chart.Printing.PrintDocument.DefaultPageSettings.Margins.Top = 50;
     chart.Printing.PrintDocument.DefaultPageSettings.Margins.Left = 50;
     chart.Printing.PrintDocument.DefaultPageSettings.Margins.Right = 50;
     chart.Printing.PrintDocument.DefaultPageSettings.Landscape = true;
     chart.Printing.PrintDocument.DefaultPageSettings.Color = true;

     ...
  }

  public void Print()
  {
     //print method with show print dialog
     chart.Printing.Print(true);
  }

  void PrintDocument_BeginPrint(object sender, System.Drawing.Printing.PrintEventArgs e)
  {
     //set print color
     PrintChartColorSet();
  }

  void PrintDocument_EndPrint(object sender, System.Drawing.Printing.PrintEventArgs e)
  {
     //restore colors
     PrintChartColorRestoreDefault();
  }

  void PrintDocument_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
  {
     //print chart into rectangle defined by margins
     Rectangle chartPosition = new Rectangle(e.MarginBounds.X, e.MarginBounds.Y, e.MarginBounds.Width, e.MarginBounds.Height);

     chart.Printing.PrintPaint(e.Graphics, chartPosition);
  }

  Color BackColor, BorderlineColor, CaBackColor, CaBorderColor, AxColor, LeBackColor, LeForeColor;

  void PrintChartColorSet()
  {
     BackColor = chart.BackColor;
     chart.BackColor = Color.White;

     BorderlineColor = chart.BorderlineColor;
     chart.BorderlineColor = Color.White;

     CaBackColor = chart.ChartAreas[0].BackColor;
     chart.ChartAreas[0].BackColor = Color.White;

     CaBorderColor = chart.ChartAreas[0].BorderColor;
     chart.ChartAreas[0].BorderColor = Color.Black;

     AxColor = chart.ChartAreas[0].Axes[0].LineColor;

     foreach(Axis a in chart.ChartAreas[0].Axes)
     {
        a.LineColor = Color.Black;
        a.TitleForeColor = Color.Black;
        a.MajorGrid.LineColor = Color.Black;
        a.MajorTickMark.LineColor = Color.Black;
        a.MinorGrid.LineColor = Color.Black;
        a.MinorTickMark.LineColor = Color.Black;
        a.LabelStyle.ForeColor = Color.Black;
     }

     LeBackColor = chart.Legends[0].BackColor;
     chart.Legends[0].BackColor = Color.White;

     LeForeColor = chart.Legends[0].ForeColor;
     chart.Legends[0].ForeColor = Color.Black;
  }

  void PrintChartColorRestoreDefault()
  {
     chart.BackColor = BackColor;
     chart.BorderlineColor = BorderlineColor;
     chart.ChartAreas[0].BackColor = CaBackColor;
     chart.ChartAreas[0].BorderColor = CaBorderColor;

     foreach(Axis a in chart.ChartAreas[0].Axes)
     {
        a.LineColor = AxColor;
        a.TitleForeColor = AxColor;
        a.MajorGrid.LineColor = AxColor;
        a.MajorTickMark.LineColor = AxColor;
        a.MinorGrid.LineColor = AxColor;
        a.MinorTickMark.LineColor = AxColor;
        a.LabelStyle.ForeColor = AxColor;
     }

     chart.Legends[0].BackColor = LeBackColor;
     chart.Legends[0].ForeColor = LeForeColor;
  }

Answer 2

不幸的是，没有简单的方法，因为 PrintPreview 不提供任何回调。

您可以制作仅用于打印的图表副本，并将默认图表区域替换为自定义区域（具有自定义背景）。

另一种方法是更改​​ BG 颜色，使用 PrintPaint 将图表打印到内存中的图像，恢复 BG 颜色并为刚刚渲染的图像手动显示打印对话框。

还有更多方法，例如挂钩新创建的窗口，但它们变得越来越复杂和肮脏。

祝你好运