silverlight 中 MultiScaleImage 与 Canvas绑定

概述1  from http://jimlynn.wordpress.com/2009/09/17/scale-other-content-on-top-of-a-deep-zoom-image/ Marthinus asked, in a comment: “is there ANY way to overwrite this, so that I can make the msi use a mu

1  from http://jimlynn.wordpress.com/2009/09/17/scale-other-content-on-top-of-a-deep-zoom-image/

Marthinus asked,in a comment:

“is there ANY way to overwrite this,so that I can make the msi use a multiscalesubimage WITH an extra canvas ontop (which would then move and scale WITH the subimage)?”

Now,I’ve never done overlays with collections and sub-images,and one thing you definitely can’t do is interleave other content with subimages of a deep zoom image (since the MultiScaleImage is a single UI element). But I have done things which have locked an overlay panel to the movement of the MultiScaleImage. Here’s a sample. First,the Xaml.

<UserControl x:Class="DeepZoomCanvas.MainPage"
 xmlns=" http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 xmlns:x=" http://schemas.microsoft.com/winfx/2006/xaml"
 xmlns:d=" http://schemas.microsoft.com/expression/blend/2008" xmlns:mc=" http://schemas.openxmlformats.org/markup-compatibility/2006"
 mc:Ignorable="d" d:DesignWIDth="640" d:DesignHeight="480">
 <GrID x:name="LayoutRoot">
 <MultiScaleImage x:name="msi" Source=" http://www.uslot.com/ClientBin/dzc_output.xml"/>
 <GrID
 IsHitTestVisible="False"
 x:name="overlay">
 <GrID.Rendertransform>
 <transformGroup>
 <Scaletransform x:name="overlayScale"/>
 <Translatetransform x:name="overlayTranslate"/>
 </transformGroup>
 </GrID.Rendertransform>
 <border
 CornerRadius="8"
 Background="#44FFFFFF"
 VerticalAlignment="Center"
 HorizontalAlignment="Center"
 padding="30">
 <StackPanel>
 <TextBlock
 FontFamily="Arial"
 FontSize="24"
 MaxWIDth="400"
 FontWeight="Bold"
 textwrapPing="Wrap">
 This shows some elements which
 scale and translate locked to
 the underlying MultiScaleImage.
 Any layout items can be used here.
 </TextBlock>
 <border Background="#55FF0000" padding="10" HorizontalAlignment="Center" VerticalAlignment="top">
 <StackPanel>
 <TextBlock
 FontFamily="Arial"
 FontSize="0.1"
 >This is a tiny line of text which still scales in concert with the deep zoom image.</TextBlock>
 </StackPanel>
 </border>
 </StackPanel>
 </border>
 </GrID>
 </GrID>
</UserControl>

01	<UserControl x:Class="DeepZoomCanvas.MainPage"

02	xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

03	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

04	xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

05	mc:Ignorable="d" d:DesignWIDth="640" d:DesignHeight="480">

06	<GrID x:name="LayoutRoot">

07	<MultiScaleImage x:name="msi" Source="http://www.uslot.com/ClientBin/dzc_output.xml"/>

08

<GrID

09	IsHitTestVisible="False"

10	x:name="overlay">

11	<GrID.Rendertransform>

12	<transformGroup>

13	<Scaletransform x:name="overlayScale"/>

14	<Translatetransform x:name="overlayTranslate"/>

15	</transformGroup>

16	</GrID.Rendertransform>

17

<border

18	CornerRadius="8"

19	Background="#44FFFFFF"

20	VerticalAlignment="Center"

21	HorizontalAlignment="Center"

22	padding="30">

23	<StackPanel>

24	<TextBlock

25	FontFamily="Arial"

26	FontSize="24"

27	MaxWIDth="400"

28	FontWeight="Bold"

29	textwrapPing="Wrap">

30	This shows some elements which

31	scale and translate locked to

32	the underlying MultiScaleImage.

33	Any layout items can be used here.

34	</TextBlock>

35	<border Background="#55FF0000" padding="10" HorizontalAlignment="Center" VerticalAlignment="top">

36	<StackPanel>

37	<TextBlock

38	FontFamily="Arial"

39	FontSize="0.1"

40	>This is a tiny line of text which still scales in concert with the deep zoom image.</TextBlock>

41	</StackPanel>

42

</border>

43	</StackPanel>

44

</border>

45

</GrID>

46

</GrID>

47	</UserControl>

And the corresponding C# code:

 

using System;using System.Collections.Generic;using System.linq;using System.Net;using System.windows;using System.windows.Controls;using System.windows.documents;using System.windows.input;using System.windows.Media;using System.windows.Media.Animation;using System.windows.Shapes;namespace DeepZoomCanvas{ public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); msi.MouseleftbuttonDown += new MousebuttonEventHandler(msi_MouseleftbuttonDown); msi.MouseMove += new MouseEventHandler(msi_MouseMove); msi.MouseleftbuttonUp += new MousebuttonEventHandler(msi_MouseleftbuttonUp); msi.MouseWheel += new MouseWheelEventHandler(msi_MouseWheel); // Track changes to the multi scale image msi.VIEwportChanged += new RoutedEventHandler(msi_VIEwportChanged); } /// <summary> /// This is the code which locks the overlay to the underlying deep zoom image. /// All it really does is set the scale factor and offset of the overlay /// based on the current setting of the deep zoom image. /// </summary> ///<param name="sender">event sender</param> ///<param name="e">event args</param> voID msi_VIEwportChanged(object sender,RoutedEventArgs e) { // This event is called during animations of the image. // Match the scaling of the canvas with the image Point vIEwportOrigin = msi.VIEwportOrigin; double vIEwportWIDth = msi.VIEwportWIDth; // The scale factor is just the inverse of the VIEwportWIDth overlayScale.ScaleX = 1 / vIEwportWIDth; overlayScale.ScaleY = 1 / vIEwportWIDth; // The offset is calculated by finding the location of the origin of the dzi // in element coordinates. Point newO = LogicaltoElement(new Point(),vIEwportOrigin,vIEwportWIDth); overlayTranslate.X = newO.X; overlayTranslate.Y = newO.Y; } private Point LogicaltoElement(Point p,Point Origin,double WIDth) { return new Point(((p.X - Origin.X) / WIDth) * msi.ActualWIDth,((p.Y - Origin.Y) / WIDth) * msi.ActualWIDth); } public Point ElementTological(Point p,double WIDth) { return new Point(Origin.X + (p.X * WIDth) / msi.ActualWIDth,Origin.Y + (p.Y * WIDth) / msi.ActualWIDth); }#region Mouse handling voID msi_MouseWheel(object sender,MouseWheelEventArgs e) { if (e.Delta < 0) { Point logicalPoint = msi.ElementTologicalPoint(lastMousePos); msi.ZoomAboutLogicalPoint(0.8,logicalPoint.X,logicalPoint.Y); } else { Point logicalPoint = msi.ElementTologicalPoint(lastMousePos); msi.ZoomAboutLogicalPoint(1.2,logicalPoint.Y); } } voID msi_MouseleftbuttonUp(object sender,MousebuttonEventArgs e) { if (IsMouseDown) { msi.ReleaseMouseCapture(); if (IsDrag == false) { if ((Keyboard.ModifIErs & ModifIErKeys.Control) == ModifIErKeys.Control) { Point logicalPoint = msi.ElementTologicalPoint(lastMousePos); msi.ZoomAboutLogicalPoint(0.8,logicalPoint.Y); } else { Point logicalPoint = msi.ElementTologicalPoint(lastMousePos); msi.ZoomAboutLogicalPoint(1.2,logicalPoint.Y); } } IsMouseDown = false; IsDrag = false; } } voID msi_MouseMove(object sender,MouseEventArgs e) { lastMousePos = e.Get@R_419_4612@(msi); if (IsMouseDown) { IsDrag = true; } if (IsDrag) { Point newPoint = lastMouseVIEwPort; newPoint.X += (lastMouseDownPos.X - lastMousePos.X) / msi.ActualWIDth * msi.VIEwportWIDth; newPoint.Y += (lastMouseDownPos.Y - lastMousePos.Y) / msi.ActualWIDth * msi.VIEwportWIDth; msi.VIEwportOrigin = newPoint; } } bool IsMouseDown = false; bool IsDrag = false; private Point lastMouseDownPos = new Point(); private Point lastMouseVIEwPort = new Point(); private Point lastMousePos = new Point(); voID msi_MouseleftbuttonDown(object sender,MousebuttonEventArgs e) { IsMouseDown = true; msi.CaptureMouse(); lastMouseDownPos = e.Get@R_419_4612@(msi); lastMouseVIEwPort = msi.VIEwportOrigin; } #endregion     }}

001	using System;

002	using System.Collections.Generic;

003	using System.linq;

004	using System.Net;

005	using System.windows;

006	using System.windows.Controls;

007	using System.windows.documents;

008	using System.windows.input;

009	using System.windows.Media;

010	using System.windows.Media.Animation;

011	using System.windows.Shapes;

012

013	namespace DeepZoomCanvas

014

{

015	public partial class MainPage : UserControl

016

{

017	public MainPage()

018

{

019	InitializeComponent();

020	msi.MouseleftbuttonDown += new MousebuttonEventHandler(msi_MouseleftbuttonDown);

021	msi.MouseMove += new MouseEventHandler(msi_MouseMove);

022	msi.MouseleftbuttonUp += new MousebuttonEventHandler(msi_MouseleftbuttonUp);

023	msi.MouseWheel += new MouseWheelEventHandler(msi_MouseWheel);

024

025	// Track changes to the multi scale image

026	msi.VIEwportChanged += new RoutedEventHandler(msi_VIEwportChanged);

027

}

028

029	/// <summary>

030	/// This is the code which locks the overlay to the underlying deep zoom image.

031	/// All it really does is set the scale factor and offset of the overlay

032	/// based on the current setting of the deep zoom image.

033	/// </summary>

034

///

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

036

///

037	<param name="e">event args</param>

038	voID msi_VIEwportChanged(object sender,RoutedEventArgs e)

039

{

040	// This event is called during animations of the image.

041	// Match the scaling of the canvas with the image

042	Point vIEwportOrigin = msi.VIEwportOrigin;

043	double vIEwportWIDth = msi.VIEwportWIDth;

044

045	// The scale factor is just the inverse of the VIEwportWIDth

046	overlayScale.ScaleX = 1 / vIEwportWIDth;

047	overlayScale.ScaleY = 1 / vIEwportWIDth;

048

049	// The offset is calculated by finding the location of the origin of the dzi

050	// in element coordinates.

051	Point newO = LogicaltoElement(new Point(),vIEwportWIDth);

052	overlayTranslate.X = newO.X;

053	overlayTranslate.Y = newO.Y;

054

}

055

056	private Point LogicaltoElement(Point p,double WIDth)

057

{

058	return new Point(((p.X - Origin.X) / WIDth) * msi.ActualWIDth,

059	((p.Y - Origin.Y) / WIDth) * msi.ActualWIDth);

060

}

061

062	public Point ElementTological(Point p,double WIDth)

063

{

064	return new Point(Origin.X + (p.X * WIDth) / msi.ActualWIDth,

065	Origin.Y + (p.Y * WIDth) / msi.ActualWIDth);

066

}

067

068	#region Mouse handling

069	voID msi_MouseWheel(object sender,MouseWheelEventArgs e)

070

{

071	if (e.Delta < 0)

072

{

073	Point logicalPoint = msi.ElementTologicalPoint(lastMousePos);

074	msi.ZoomAboutLogicalPoint(0.8,logicalPoint.Y);

075

076

}

077

else

078

{

079	Point logicalPoint = msi.ElementTologicalPoint(lastMousePos);

080	msi.ZoomAboutLogicalPoint(1.2,logicalPoint.Y);

081

}

082

}

083

084	voID msi_MouseleftbuttonUp(object sender,MousebuttonEventArgs e)

085

{

086	if (IsMouseDown)

087

{

088	msi.ReleaseMouseCapture();

089	if (IsDrag == false)

090

{

091	if ((Keyboard.ModifIErs & ModifIErKeys.Control) == ModifIErKeys.Control)

092

{

093	Point logicalPoint = msi.ElementTologicalPoint(lastMousePos);

094	msi.ZoomAboutLogicalPoint(0.8,logicalPoint.Y);

095

}

096

else

097

{

098	Point logicalPoint = msi.ElementTologicalPoint(lastMousePos);

099	msi.ZoomAboutLogicalPoint(1.2,logicalPoint.Y);

100

}

101

}

102	IsMouseDown = false;

103	IsDrag = false;

104

}

105

}

106

107	voID msi_MouseMove(object sender,MouseEventArgs e)

108

{

109	lastMousePos = e.Get@R_419_4612@(msi);

110	if (IsMouseDown)

111

{

112	IsDrag = true;

113

}

114	if (IsDrag)

115

{

116	Point newPoint = lastMouseVIEwPort;

117	newPoint.X += (lastMouseDownPos.X - lastMousePos.X) / msi.ActualWIDth * msi.VIEwportWIDth;

118	newPoint.Y += (lastMouseDownPos.Y - lastMousePos.Y) / msi.ActualWIDth * msi.VIEwportWIDth;

119	msi.VIEwportOrigin = newPoint;

120

}

121

}

122

123	bool IsMouseDown = false;

124	bool IsDrag = false;

125	private Point lastMouseDownPos = new Point();

126	private Point lastMouseVIEwPort = new Point();

127	private Point lastMousePos = new Point();

128

129	voID msi_MouseleftbuttonDown(object sender,MousebuttonEventArgs e)

130

{

131	IsMouseDown = true;

132	msi.CaptureMouse();

133	lastMouseDownPos = e.Get@R_419_4612@(msi);

134	lastMouseVIEwPort = msi.VIEwportOrigin;

135

}

136

137	#endregion

138

}

139

}

All the work is done in the VIEwportChanged event handler (which fires every time the vIEwport changes,even during animations). I’ve set a scale transform and a translate transform on the grID (which Could be a canvas if you want) and we adjust the scale and translate values to match the underlying image.

All the rest of the code is just bog-standard deep zoom image mouse handling.

Try zooming into the red square to see a very small line of text.

Hope this helps.

 

 

2 From http://blogs.msdn.com/b/lutzg/archive/2008/08/19/synchronizing-images-with-the-deep-zoom-content.aspx

 

Synchronizing other content with Deep Zoom

When you set VIEwportOrigin or VIEwportWIDth (or use the ZoomAboutPoint helper),deep zoom simply kicks off an animation to the new location. This animation happens entirely under the hood and is transparent to the developer. That's very nice for the dead simple zooming application,since the developer doesn't have to worry about making pretty animations when zooming and panning. Pretty animations are built in.

However,this behavior does cause a problem if you want to make other things in Silverlight move along with zooming and panning of the Deep Zoom image.

So what's the trick? Everytime a user pans or zooms,this application sets of a 0-length-storyboard that tracks what Deep Zoom is doing,and adjust size and @R_419_4612@ for the pins. The 0-length-storyboard does its thing for 1500 ms,which is exactly the amount of time Deep Zoom allocates for each animation.

Using powerlaw scaling

Another nifty little feature that was put into this application is powerlaw scaling. The size of the pins only grows at a fraction of the rate of the rest of the map. This needs to be done,since if the size of the pins is kept constant,our eyes fall victim to an optical illusion: when zooming in,the pins would look like they are shrinking,and when zooming out,the appear to be growing.Power-law scaling makes this visual effect much less noticeable.

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