ZedGraph 柱状图、饼图、折线图演示源码

//

//This library is free software; you can redistribute it and/or

//modify it under the terms of the GNU Lesser General Public

//License as published by the Free Software Foundation; either

//version 2.1 of the License, or (at your option) any later version.

//

//This library is distributed in the hope that it will be useful,

//but WITHOUT ANY WARRANTY; without even the implied warranty of

//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

//Lesser General Public License for more details.

//

//You should have received a copy of the GNU Lesser General Public

//License along with this library; if not, write to the Free Software

//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

//=============================================================================

using System;

using System.ComponentModel;

using System.Drawing;

using System.Drawing.Drawing2D;

using System.Drawing.Text;

using System.Windows.Forms;

using System.Threading;

using System.Drawing.Imaging;

using System.IO;

using System.Text;

using System.Runtime.InteropServices;

//using System.Diagnostics;

namespace ZedGraph

{

partial class ZedGraphControl

{

#region ContextMenu

// Revision: JCarpenter 10/06

/// <summary>

/// Public enumeration that specifies the type of

/// object present at the Context Menu‘s mouse location

/// </summary>

public enum ContextMenuObjectState

{

/// <summary>

/// The object is an Inactive Curve Item at the Context Menu‘s mouse position

/// </summary>

InactiveSelection,

/// <summary>

/// The object is an active Curve Item at the Context Menu‘s mouse position

/// </summary>

ActiveSelection,

/// <summary>

/// There is no selectable object present at the Context Menu‘s mouse position

/// </summary>

Background

}

//Revision: JCarpenter 10/06

/// <summary>

/// Find the object currently under the mouse cursor, and return its state.

/// </summary>

private ContextMenuObjectState GetObjectState()

{

ContextMenuObjectState objState = ContextMenuObjectState.Background;

// Determine object state

Point mousePt = this.PointToClient( Control.MousePosition );

int iPt;

GraphPane pane;

object nearestObj;

using ( Graphics g = this.CreateGraphics() )

{

if ( this.MasterPane.FindNearestPaneObject( mousePt, g, out pane,

out nearestObj, out iPt ) )

{

CurveItem item = nearestObj as CurveItem;

if ( item != null && iPt >= 0 )

{

if ( item.IsSelected )

objState = ContextMenuObjectState.ActiveSelection;

else

objState = ContextMenuObjectState.InactiveSelection;

}

return objState;

}

/// <summary>

/// protected method to handle the popup context menu in the <see cref="ZedGraphControl"/>.

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void contextMenuStrip1_Opening( object sender, CancelEventArgs e )

{

// disable context menu by default

e.Cancel = true;

ContextMenuStrip menuStrip = sender as ContextMenuStrip;

//Revision: JCarpenter 10/06

ContextMenuObjectState objState = GetObjectState();

if ( _masterPane != null && menuStrip != null )

{

menuStrip.Items.Clear();

_isZooming = false;

_isPanning = false;

Cursor.Current = Cursors.Default;

_menuClickPt = this.PointToClient( Control.MousePosition );

GraphPane pane = _masterPane.FindPane( _menuClickPt );

if ( _isShowContextMenu )

{

string menuStr = string.Empty;

ToolStripMenuItem item = new ToolStripMenuItem();

item.Name = "copy";

item.Tag = "copy";

item.Text = _resourceManager.GetString( "copy" );

item.Click += new System.EventHandler( this.MenuClick_Copy );

menuStrip.Items.Add( item );

item = new ToolStripMenuItem();

item.Name = "save_as";

item.Tag = "save_as";

item.Text = _resourceManager.GetString( "save_as" );

item.Click += new System.EventHandler( this.MenuClick_SaveAs );

menuStrip.Items.Add( item );

item = new ToolStripMenuItem();

item.Name = "page_setup";

item.Tag = "page_setup";

item.Text = _resourceManager.GetString( "page_setup" );

item.Click += new System.EventHandler( this.MenuClick_PageSetup );

menuStrip.Items.Add( item );

item = new ToolStripMenuItem();

item.Name = "print";

item.Tag = "print";

item.Text = _resourceManager.GetString( "print" );

item.Click += new System.EventHandler( this.MenuClick_Print );

menuStrip.Items.Add( item );

item = new ToolStripMenuItem();

item.Name = "show_val";

item.Tag = "show_val";

item.Text = _resourceManager.GetString( "show_val" );

item.Click += new System.EventHandler( this.MenuClick_ShowValues );

item.Checked = this.IsShowPointValues;

menuStrip.Items.Add( item );

item = new ToolStripMenuItem();

item.Name = "unzoom";

item.Tag = "unzoom";

if ( pane == null || pane.ZoomStack.IsEmpty )

menuStr = _resourceManager.GetString( "unzoom" );

else

{

switch ( pane.ZoomStack.Top.Type )

{

case ZoomState.StateType.Zoom:

case ZoomState.StateType.WheelZoom:

menuStr = _resourceManager.GetString( "unzoom" );

break;

case ZoomState.StateType.Pan:

menuStr = _resourceManager.GetString( "unpan" );

break;

case ZoomState.StateType.Scroll:

menuStr = _resourceManager.GetString( "unscroll" );

break;

}

//menuItem.Text = "Un-" + ( ( pane == null || pane.zoomStack.IsEmpty ) ?

// "Zoom" : pane.zoomStack.Top.TypeString );

item.Text = menuStr;

item.Click += new EventHandler( this.MenuClick_ZoomOut );

if ( pane == null || pane.ZoomStack.IsEmpty )

item.Enabled = false;

menuStrip.Items.Add( item );

item = new ToolStripMenuItem();

item.Name = "undo_all";

item.Tag = "undo_all";

menuStr = _resourceManager.GetString( "undo_all" );

item.Text = menuStr;

item.Click += new EventHandler( this.MenuClick_ZoomOutAll );

if ( pane == null || pane.ZoomStack.IsEmpty )

item.Enabled = false;

menuStrip.Items.Add( item );

item = new ToolStripMenuItem();

item.Name = "set_default";

item.Tag = "set_default";

menuStr = _resourceManager.GetString( "set_default" );

item.Text = menuStr;

item.Click += new EventHandler( this.MenuClick_RestoreScale );

if ( pane == null )

item.Enabled = false;

menuStrip.Items.Add( item );

// if e.Cancel is set to false, the context menu does not display

// it is initially set to false because the context menu has no items

e.Cancel = false;

// Provide Callback for User to edit the context menu

//Revision: JCarpenter 10/06 - add ContextMenuObjectState objState

if ( this.ContextMenuBuilder != null )

this.ContextMenuBuilder( this, menuStrip, _menuClickPt, objState );

}

/// <summary>

/// Handler for the "Copy" context menu item. Copies the current image to a bitmap on the

/// clipboard.

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

protected void MenuClick_Copy( System.Object sender, System.EventArgs e )

{

Copy( _isShowCopyMessage );

}

/// <summary>

/// Handler for the "Copy" context menu item. Copies the current image to a bitmap on the

/// clipboard.

/// </summary>

/// <param name="isShowMessage">boolean value that determines whether or not a prompt will be

/// displayed. true to show a message of "Image Copied to ClipBoard".</param>

public void Copy( bool isShowMessage )

{

if ( _masterPane != null )

{

//Clipboard.SetDataObject( _masterPane.GetImage(), true );

// Threaded copy mode to avoid crash with MTA

// Contributed by Dave Moor

Thread ct = new Thread( new ThreadStart( this.ClipboardCopyThread ) );

//ct.ApartmentState = ApartmentState.STA;

ct.SetApartmentState( ApartmentState.STA );

ct.Start();

ct.Join();

if ( isShowMessage )

{

string str = _resourceManager.GetString( "copied_to_clip" );

//MessageBox.Show( "Image Copied to ClipBoard" );

MessageBox.Show( str );

}

/// <summary>

/// A threaded version of the copy method to avoid crash with MTA

/// </summary>

private void ClipboardCopyThread()

{

Clipboard.SetDataObject( ImageRender(), true );

}

//

/// <summary>

/// Setup for creation of a new image, applying appropriate anti-alias properties and

/// returning the resultant image file

/// </summary>

/// <returns></returns>

private Image ImageRender()

{

return _masterPane.GetImage( _masterPane.IsAntiAlias );

}

/// <summary>

/// Special handler that copies the current image to an Emf file on the clipboard.

/// </summary>

/// <remarks>This version is similar to the regular <see cref="Copy" /> method, except that

/// it will place an Emf image (vector) on the ClipBoard instead of the regular bitmap.</remarks>

/// <param name="isShowMessage">boolean value that determines whether or not a prompt will be

/// displayed. true to show a message of "Image Copied to ClipBoard".</param>

public void CopyEmf(bool isShowMessage)

{

if (_masterPane != null)

{

// Threaded copy mode to avoid crash with MTA

// Contributed by Dave Moor

Thread ct = new Thread(new ThreadStart(this.ClipboardCopyThreadEmf));

//ct.ApartmentState = ApartmentState.STA;

ct.SetApartmentState(ApartmentState.STA);

ct.Start();

ct.Join();

if (isShowMessage)

{

string str = _resourceManager.GetString("copied_to_clip");

MessageBox.Show(str);

}

/// <summary>

/// A threaded version of the copy method to avoid crash with MTA

/// </summary>

private void ClipboardCopyThreadEmf()

{

using (Graphics g = this.CreateGraphics())

{

IntPtr hdc = g.GetHdc();

Metafile metaFile = new Metafile(hdc, EmfType.EmfPlusOnly);

g.ReleaseHdc(hdc);

using (Graphics gMeta = Graphics.FromImage(metaFile))

{

this._masterPane.Draw( gMeta );

}

//IntPtr hMeta = metaFile.GetHenhmetafile();

ClipboardMetafileHelper.PutEnhMetafileOnClipboard( this.Handle, metaFile );

//System.Windows.Forms.Clipboard.SetDataObject(hMeta, true);

//g.Dispose();

}

/// <summary>

/// Handler for the "Save Image As" context menu item. Copies the current image to the selected

/// file.

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

protected void MenuClick_SaveAs( System.Object sender, System.EventArgs e )

{

SaveAs();

}

/// <summary>

/// Handler for the "Save Image As" context menu item. Copies the current image to the selected

/// file in either the Emf (vector), or a variety of Bitmap formats.

/// </summary>

/// <remarks>

/// Note that <see cref="SaveAsBitmap" /> and <see cref="SaveAsEmf" /> methods are provided

/// which allow for Bitmap-only or Emf-only handling of the "Save As" context menu item.

/// </remarks>

public void SaveAs()

{

SaveAs( null );

}

/// <summary>

/// Copies the current image to the selected file in

/// Emf (vector), or a variety of Bitmap formats.

/// </summary>

/// <param name="DefaultFileName">

/// Accepts a default file name for the file dialog (if "" or null, default is not used)

/// </param>

/// <returns>

/// The file name saved, or "" if cancelled.

/// </returns>

/// <remarks>

/// Note that <see cref="SaveAsBitmap" /> and <see cref="SaveAsEmf" /> methods are provided

/// which allow for Bitmap-only or Emf-only handling of the "Save As" context menu item.

/// </remarks>

public String SaveAs( String DefaultFileName )

{

if ( _masterPane != null )

{

_saveFileDialog.Filter =

"Emf Format (*.emf)|*.emf|" +

"PNG Format (*.png)|*.png|" +

"Gif Format (*.gif)|*.gif|" +

"Jpeg Format (*.jpg)|*.jpg|" +

"Tiff Format (*.tif)|*.tif|" +

"Bmp Format (*.bmp)|*.bmp";

if ( DefaultFileName != null && DefaultFileName.Length > 0 )

{

String ext = System.IO.Path.GetExtension( DefaultFileName ).ToLower();

switch (ext)

{

case ".emf": _saveFileDialog.FilterIndex = 1; break;

case ".png": _saveFileDialog.FilterIndex = 2; break;

case ".gif": _saveFileDialog.FilterIndex = 3; break;

case ".jpeg":

case ".jpg": _saveFileDialog.FilterIndex = 4; break;

case ".tiff":

case ".tif": _saveFileDialog.FilterIndex = 5; break;

case ".bmp": _saveFileDialog.FilterIndex = 6; break;

}

//If we were passed a file name, not just an extension, use it

if ( DefaultFileName.Length > ext.Length )

{

_saveFileDialog.FileName = DefaultFileName;

}

if ( _saveFileDialog.ShowDialog() == DialogResult.OK )

{

Stream myStream = _saveFileDialog.OpenFile();

if ( myStream != null )

{

if ( _saveFileDialog.FilterIndex == 1 )

{

myStream.Close();

SaveEmfFile( _saveFileDialog.FileName );

}

else

{

ImageFormat format = ImageFormat.Png;

switch (_saveFileDialog.FilterIndex)

{

case 2: format = ImageFormat.Png; break;

case 3: format = ImageFormat.Gif; break;

case 4: format = ImageFormat.Jpeg; break;

case 5: format = ImageFormat.Tiff; break;

case 6: format = ImageFormat.Bmp; break;

}

ImageRender().Save( myStream, format );

//_masterPane.GetImage().Save( myStream, format );

myStream.Close();

}

return _saveFileDialog.FileName;

}

return "";

}

/// <summary>

/// Handler for the "Save Image As" context menu item. Copies the current image to the selected

/// Bitmap file.

/// </summary>

/// <remarks>

/// Note that this handler saves as a bitmap only. The default handler is

/// <see cref="SaveAs()" />, which allows for Bitmap or EMF formats

/// </remarks>

public void SaveAsBitmap()

{

if ( _masterPane != null )

{

_saveFileDialog.Filter =

"PNG Format (*.png)|*.png|" +

"Gif Format (*.gif)|*.gif|" +

"Jpeg Format (*.jpg)|*.jpg|" +

"Tiff Format (*.tif)|*.tif|" +

"Bmp Format (*.bmp)|*.bmp";

if ( _saveFileDialog.ShowDialog() == DialogResult.OK )

{

ImageFormat format = ImageFormat.Png;

if ( _saveFileDialog.FilterIndex == 2 )

format = ImageFormat.Gif;

else if ( _saveFileDialog.FilterIndex == 3 )

format = ImageFormat.Jpeg;

else if ( _saveFileDialog.FilterIndex == 4 )

format = ImageFormat.Tiff;

else if ( _saveFileDialog.FilterIndex == 5 )

format = ImageFormat.Bmp;

Stream myStream = _saveFileDialog.OpenFile();

if ( myStream != null )

{

//_masterPane.GetImage().Save( myStream, format );

ImageRender().Save( myStream, format );

myStream.Close();

}

/// <summary>

/// Handler for the "Save Image As" context menu item. Copies the current image to the selected

/// Emf format file.

/// </summary>

/// <remarks>

/// Note that this handler saves as an Emf format only. The default handler is

/// <see cref="SaveAs()" />, which allows for Bitmap or EMF formats.

/// </remarks>

public void SaveAsEmf()

{

if ( _masterPane != null )

{

_saveFileDialog.Filter = "Emf Format (*.emf)|*.emf";

if ( _saveFileDialog.ShowDialog() == DialogResult.OK )

{

Stream myStream = _saveFileDialog.OpenFile();

if ( myStream != null )

{

myStream.Close();

//_masterPane.GetMetafile().Save( _saveFileDialog.FileName );

SaveEmfFile(_saveFileDialog.FileName);

}

/// <summary>

/// Save the current Graph to the specified filename in EMF (vector) format.

/// See <see cref="SaveAsEmf()" /> for public access.

/// </summary>

/// <remarks>

/// Note that this handler saves as an Emf format only. The default handler is

/// <see cref="SaveAs()" />, which allows for Bitmap or EMF formats.

/// </remarks>

internal void SaveEmfFile( string fileName )

{

using (Graphics g = this.CreateGraphics())

{

IntPtr hdc = g.GetHdc();

Metafile metaFile = new Metafile(hdc, EmfType.EmfPlusOnly);

using (Graphics gMeta = Graphics.FromImage(metaFile))

{

//PaneBase.SetAntiAliasMode( gMeta, IsAntiAlias );

//gMeta.CompositingMode = CompositingMode.SourceCopy;

//gMeta.CompositingQuality = CompositingQuality.HighQuality;

//gMeta.InterpolationMode = InterpolationMode.HighQualityBicubic;

//gMeta.SmoothingMode = SmoothingMode.AntiAlias;

//gMeta.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

this._masterPane.Draw(gMeta);

//gMeta.Dispose();

}

ClipboardMetafileHelper.SaveEnhMetafileToFile(metaFile, fileName );

g.ReleaseHdc(hdc);

//g.Dispose();

}

internal class ClipboardMetafileHelper

{

[DllImport("user32.dll")]

static extern bool OpenClipboard(IntPtr hWndNewOwner);

[DllImport("user32.dll")]

static extern bool EmptyClipboard();

[DllImport("user32.dll")]

static extern IntPtr SetClipboardData(uint uFormat, IntPtr hMem);

[DllImport("user32.dll")]

static extern bool CloseClipboard();

[DllImport("gdi32.dll")]

static extern IntPtr CopyEnhMetaFile(IntPtr hemfSrc, System.Text.StringBuilder hNULL);

[DllImport("gdi32.dll")]

static extern bool DeleteEnhMetaFile(IntPtr hemf);

static internal bool SaveEnhMetafileToFile( Metafile mf, string fileName )

{

bool bResult = false;

IntPtr hEMF;

hEMF = mf.GetHenhmetafile(); // invalidates mf

if (!hEMF.Equals(new IntPtr(0)))

{

StringBuilder tempName = new StringBuilder(fileName);

CopyEnhMetaFile(hEMF, tempName);

DeleteEnhMetaFile(hEMF);

}

return bResult;

}

static internal bool SaveEnhMetafileToFile(Metafile mf)

{

bool bResult = false;

IntPtr hEMF;

hEMF = mf.GetHenhmetafile(); // invalidates mf

if (!hEMF.Equals(new IntPtr(0)))

{

SaveFileDialog sfd = new SaveFileDialog();

sfd.Filter = "Extended Metafile (*.emf)|*.emf";

sfd.DefaultExt = ".emf";

if (sfd.ShowDialog() == DialogResult.OK)

{

StringBuilder temp = new StringBuilder(sfd.FileName);

CopyEnhMetaFile(hEMF, temp);

}

DeleteEnhMetaFile(hEMF);

}

return bResult;

}

// Metafile mf is set to a state that is not valid inside this function.

static internal bool PutEnhMetafileOnClipboard(IntPtr hWnd, Metafile mf)

{

bool bResult = false;

IntPtr hEMF, hEMF2;

hEMF = mf.GetHenhmetafile(); // invalidates mf

if (!hEMF.Equals(new IntPtr(0)))

{

hEMF2 = CopyEnhMetaFile(hEMF, null);

if (!hEMF2.Equals(new IntPtr(0)))

{

if (OpenClipboard(hWnd))

{

if (EmptyClipboard())

{

IntPtr hRes = SetClipboardData(14 /*CF_ENHMETAFILE*/, hEMF2);

bResult = hRes.Equals(hEMF2);

CloseClipboard();

}

DeleteEnhMetaFile(hEMF);

}

return bResult;

}

/// <summary>

/// Handler for the "Show Values" context menu item. Toggles the <see cref="IsShowPointValues"/>

/// property, which activates the point value tooltips.

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

protected void MenuClick_ShowValues( object sender, System.EventArgs e )

{

ToolStripMenuItem item = sender as ToolStripMenuItem;

if ( item != null )

this.IsShowPointValues = !item.Checked;

}

/// <summary>

/// Handler for the "Set Scale to Default" context menu item. Sets the scale ranging to

/// full auto mode for all axes.

/// </summary>

/// <remarks>

/// This method differs from the <see cref="ZoomOutAll" /> method in that it sets the scales

/// to full auto mode. The <see cref="ZoomOutAll" /> method sets the scales to their initial

/// setting prior to any user actions (which may or may not be full auto mode).

/// </remarks>

/// <param name="sender"></param>

/// <param name="e"></param>

protected void MenuClick_RestoreScale( object sender, EventArgs e )

{

if ( _masterPane != null )

{

GraphPane pane = _masterPane.FindPane( _menuClickPt );

RestoreScale( pane );

}

/// <summary>

/// Handler for the "Set Scale to Default" context menu item. Sets the scale ranging to

/// full auto mode for all axes.

/// </summary>

/// <remarks>

/// This method differs from the <see cref="ZoomOutAll" /> method in that it sets the scales

/// to full auto mode. The <see cref="ZoomOutAll" /> method sets the scales to their initial

/// setting prior to any user actions (which may or may not be full auto mode).

/// </remarks>

/// <param name="primaryPane">The <see cref="GraphPane" /> object which is to have the

/// scale restored</param>

public void RestoreScale( GraphPane primaryPane )

{

if ( primaryPane != null )

{

//Go ahead and save the old zoomstates, which provides an "undo"-like capability

//ZoomState oldState = primaryPane.ZoomStack.Push( primaryPane, ZoomState.StateType.Zoom );

ZoomState oldState = new ZoomState( primaryPane, ZoomState.StateType.Zoom );

using ( Graphics g = this.CreateGraphics() )

{

if ( _isSynchronizeXAxes || _isSynchronizeYAxes )

{

foreach ( GraphPane pane in _masterPane._paneList )

{

pane.ZoomStack.Push( pane, ZoomState.StateType.Zoom );

ResetAutoScale( pane, g );

}

else

{

primaryPane.ZoomStack.Push( primaryPane, ZoomState.StateType.Zoom );

ResetAutoScale( primaryPane, g );

}

// Provide Callback to notify the user of zoom events

if ( this.ZoomEvent != null )

this.ZoomEvent( this, oldState, new ZoomState( primaryPane, ZoomState.StateType.Zoom ) );

//g.Dispose();

}

Refresh();

}

private void ResetAutoScale( GraphPane pane, Graphics g )

{

pane.XAxis.ResetAutoScale( pane, g );

pane.X2Axis.ResetAutoScale( pane, g );

foreach ( YAxis axis in pane.YAxisList )

axis.ResetAutoScale( pane, g );

foreach ( Y2Axis axis in pane.Y2AxisList )

axis.ResetAutoScale( pane, g );

}

/*

public void RestoreScale( GraphPane primaryPane )

{

if ( primaryPane != null )

{

Graphics g = this.CreateGraphics();

ZoomState oldState = new ZoomState( primaryPane, ZoomState.StateType.Zoom );

//ZoomState newState = null;

if ( _isSynchronizeXAxes || _isSynchronizeYAxes )

{

foreach ( GraphPane pane in _masterPane._paneList )

{

if ( pane == primaryPane )

{

pane.XAxis.ResetAutoScale( pane, g );

foreach ( YAxis axis in pane.YAxisList )

axis.ResetAutoScale( pane, g );

foreach ( Y2Axis axis in pane.Y2AxisList )

axis.ResetAutoScale( pane, g );

}

else

{

primaryPane.XAxis.ResetAutoScale( primaryPane, g );

foreach ( YAxis axis in primaryPane.YAxisList )

axis.ResetAutoScale( primaryPane, g );

foreach ( Y2Axis axis in primaryPane.Y2AxisList )

axis.ResetAutoScale( primaryPane, g );

}

// Provide Callback to notify the user of zoom events

if ( this.ZoomEvent != null )

this.ZoomEvent( this, oldState, new ZoomState( primaryPane, ZoomState.StateType.Zoom ) );

g.Dispose();

Refresh();

}

*/

/*

public void ZoomOutAll( GraphPane primaryPane )

{

if ( primaryPane != null && !primaryPane.ZoomStack.IsEmpty )

{

ZoomState.StateType type = primaryPane.ZoomStack.Top.Type;

ZoomState oldState = new ZoomState( primaryPane, type );

//ZoomState newState = pane.ZoomStack.PopAll( pane );

ZoomState newState = null;

if ( _isSynchronizeXAxes || _isSynchronizeYAxes )

{

foreach ( GraphPane pane in _masterPane._paneList )

{

ZoomState state = pane.ZoomStack.PopAll( pane );

if ( pane == primaryPane )

newState = state;

}

else

newState = primaryPane.ZoomStack.PopAll( primaryPane );

// Provide Callback to notify the user of zoom events

if ( this.ZoomEvent != null )

this.ZoomEvent( this, oldState, newState );

Refresh();

}

*/

/// <summary>

/// Handler for the "UnZoom/UnPan" context menu item. Restores the scale ranges to the values

/// before the last zoom or pan operation.

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

protected void MenuClick_ZoomOut( System.Object sender, System.EventArgs e )

{

if ( _masterPane != null )

{

GraphPane pane = _masterPane.FindPane( _menuClickPt );

ZoomOut( pane );

}

/// <summary>

/// Handler for the "UnZoom/UnPan" context menu item. Restores the scale ranges to the values

/// before the last zoom, pan, or scroll operation.

/// </summary>

/// <remarks>

/// Triggers a <see cref="ZoomEvent" /> for any type of undo (including pan, scroll, zoom, and

/// wheelzoom). This method will affect all the

/// <see cref="GraphPane" /> objects in the <see cref="MasterPane" /> if

/// <see cref="IsSynchronizeXAxes" /> or <see cref="IsSynchronizeYAxes" /> is true.

/// </remarks>

/// <param name="primaryPane">The primary <see cref="GraphPane" /> object which is to be

/// zoomed out</param>

public void ZoomOut( GraphPane primaryPane )

{

if ( primaryPane != null && !primaryPane.ZoomStack.IsEmpty )

{

ZoomState.StateType type = primaryPane.ZoomStack.Top.Type;

ZoomState oldState = new ZoomState( primaryPane, type );

ZoomState newState = null;

if ( _isSynchronizeXAxes || _isSynchronizeYAxes )

{

foreach ( GraphPane pane in _masterPane._paneList )

{

ZoomState state = pane.ZoomStack.Pop( pane );

if ( pane == primaryPane )

newState = state;

}

else

newState = primaryPane.ZoomStack.Pop( primaryPane );

// Provide Callback to notify the user of zoom events

if ( this.ZoomEvent != null )

this.ZoomEvent( this, oldState, newState );

Refresh();

}

/// <summary>

/// Handler for the "Undo All Zoom/Pan" context menu item. Restores the scale ranges to the values

/// before all zoom and pan operations

/// </summary>

/// <remarks>

/// This method differs from the <see cref="RestoreScale" /> method in that it sets the scales

/// to their initial setting prior to any user actions. The <see cref="RestoreScale" /> method

/// sets the scales to full auto mode (regardless of what the initial setting may have been).

/// </remarks>

/// <param name="sender"></param>

/// <param name="e"></param>

protected void MenuClick_ZoomOutAll( System.Object sender, System.EventArgs e )

{

if ( _masterPane != null )

{

GraphPane pane = _masterPane.FindPane( _menuClickPt );

ZoomOutAll( pane );

}

/// <summary>

/// Handler for the "Undo All Zoom/Pan" context menu item. Restores the scale ranges to the values

/// before all zoom and pan operations

/// </summary>

/// <remarks>

/// This method differs from the <see cref="RestoreScale" /> method in that it sets the scales

/// to their initial setting prior to any user actions. The <see cref="RestoreScale" /> method

/// sets the scales to full auto mode (regardless of what the initial setting may have been).

/// </remarks>

/// <param name="primaryPane">The <see cref="GraphPane" /> object which is to be zoomed out</param>

public void ZoomOutAll( GraphPane primaryPane )

{

if ( primaryPane != null && !primaryPane.ZoomStack.IsEmpty )

{

ZoomState.StateType type = primaryPane.ZoomStack.Top.Type;

ZoomState oldState = new ZoomState( primaryPane, type );

//ZoomState newState = pane.ZoomStack.PopAll( pane );

ZoomState newState = null;

if ( _isSynchronizeXAxes || _isSynchronizeYAxes )

{

foreach ( GraphPane pane in _masterPane._paneList )

{

ZoomState state = pane.ZoomStack.PopAll( pane );

if ( pane == primaryPane )

newState = state;

}

else

newState = primaryPane.ZoomStack.PopAll( primaryPane );

// Provide Callback to notify the user of zoom events

if ( this.ZoomEvent != null )

this.ZoomEvent( this, oldState, newState );

Refresh();

}

#endregion

}

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ZedGraph 柱状图、饼图、折线图演示源码

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