com.esri.adf.web.data
Class WebScaleBar

java.lang.Object
  com.esri.adf.web.data.WebScaleBar

All Implemented Interfaces:

WebContextInitialize, WebContextObserver, Serializable

public class WebScaleBar
extends Object
implements WebContextInitialize, WebContextObserver, Serializable

The WebScaleBar renders a scale bar within the map control.

To include a scale bar in the map, when declaring the map control in the map tag, a value binding to the scale bar object must be passed.

 <a:map value="#{mapContext.webMap}" scaleBar="#{mapContext.attributes['scaleBar']}" ... />
 

The scale bar may be rendered in one of two ways :
1. Default, calculated in the WebADF.
2. Using ScaleBarFunctionality of the resource.

Default : (Computed in this web control)

 <managed-bean>
   <managed-bean-name>mapContext</managed-bean-name>
   <managed-bean-class>com.esri.adf.web.data.WebContext</managed-bean-class>
   ...
   <map-entry>
     <key>scaleBar</key>
     <value>#{scaleBar}</value>
   </map-entry>
   ...
 </managed-bean>
 

Declared bean (WEB-INF/context-attributes.xml)

  <managed-bean>
   <managed-bean-name>scaleBar</managed-bean-name>
   <managed-bean-class>com.esri.adf.web.data.WebScaleBar</managed-bean-class>
   <managed-bean-scope>none</managed-bean-scope>
 </managed-bean>
 

Using functionality (example : Using AGSScaleBarFunctionality)
Declare bean (WEB-INF/functionalities/ags-functionalities.xml)

 <managed-bean>
   <managed-bean-name>agsScaleBar</managed-bean-name>
   <managed-bean-class>com.esri.adf.web.ags.data.AGSScaleBarFunctionality</managed-bean-class>
   <managed-bean-scope>none</managed-bean-scope>
 </managed-bean>
 

Add agsScaleBar functionality to list of functionalities in the resource. (WEB-INF/faces-config.xml)

 <managed-bean>
   <managed-bean-name>agsResource</managed-bean-name>
   <managed-bean-class>com.esri.adf.web.ags.data.AGSLocalMapResource</managed-bean-class>
   ...
   <managed-property>
     <property-name>functionalities</property-name>
     <map-entries>
       ...
       <map-entry>
         <key>scaleBar</key>
         <value>#{agsScaleBar}</value>
       </map-entry>
     ...
 </managed-bean>
 

Specify resource id to use scale bar functionality (WEB-INF/context-attribute.xml).

 <managed-bean>
   <managed-bean-name>scaleBar</managed-bean-name>
   <managed-bean-class>com.esri.adf.web.data.WebScaleBar</managed-bean-class>
   ...
   <managed-property>
     <property-name>resourceId</property-name>
     <value>agsResource</value>
   </managed-property>
 </managed-bean>
 

Note : When using default scale bar implementation, if no spatial reference information is found in the web context, no scale bar is rendered

See Also:

Serialized Form

Field Summary

static String	POSITION_BOTTOM_LEFT Position of scabe bar within map control : bottom-left
static String	POSITION_BOTTOM_RIGHT Position of scabe bar within map control : bottom-right
static String	POSITION_NONE Position of scabe bar within map control : none
static String	POSITION_TOP_LEFT Position of scabe bar within map control : top-left
static String	POSITION_TOP_RIGHT Position of scabe bar within map control : top-right
static String	TYPE_ALTERNATING Alternating
static String	TYPE_DOUBLE_ALTERNATING Double Alternating
static String	TYPE_SINGLE_DIVISION Single Division
static String	TYPE_STEPPED_SCALE_LINE Stepped Scale Line
static int	UNITS_FEET Scale bar display units : Feet
static int	UNITS_KILOMETERS Scale bar display units : Kilometers
static int	UNITS_METERS Scale bar display units : Meters
static int	UNITS_MILES Scale bar display units : Miles

Constructor Summary

WebScaleBar()

Method Summary

void	destroy() Implements WebContext.destroy()
int	getHeight() Get height of scale bar.
String	getImageUrl() If the scale bar uses a ScaleBarFunctionality, this method returns the URL to the image generated by calling ScaleBarFunctionality.exportImage().
double	getMapDistance() Get map distance represented by scale bar.
int	getMaxPrecision() Get maximum precision set.
String	getPosition() Get position of scale bar on the map control.
ScaleBarFunctionality	getScaleBarFunctionality() Return the scaleBarFunctionality used to draw the scale bar
double	getScreenDistance() Get screen distance, in pixels to be drawn by scale bar.
String	getType() Get the type of scale bar.
int	getUnits() Get the units to be shown in the scale bar.
int	getWidth() Get width of scale bar.
void	init(WebContext webContext) Implements WebContextInitialize.init(WebContext)
boolean	isScaleBarAvailable() Returns true if this scale bar is available for use by the user.
void	setHeight(int height) Set height of scale bar.
void	setMaxPrecision(int maxPrecision) Set maximum precision.
void	setPosition(String position) Set the position of the scale bar on the map control.
void	setResourceId(String resourceId) Set resource id to be used to retrieve scaleBarFunctionality.
void	setScaleBarFunctionality(ScaleBarFunctionality scaleBarFunctionality) Set the ScaleBarFunctionality that must be used to render the scalebar.
void	setType(String type) Set the type of scale bar to be rendered.
void	setUnits(int units) Set the units of scale bar to be rendered.
void	setWidth(int width) Set width of scale bar.
void	update(WebContext webContext, Object arg) Implements WebContextObserver.update(WebContext, Object)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

UNITS_METERS

public static final int UNITS_METERS

Scale bar display units : Meters

See Also:

Constant Field Values

UNITS_KILOMETERS

public static final int UNITS_KILOMETERS

Scale bar display units : Kilometers

See Also:

Constant Field Values

UNITS_FEET

public static final int UNITS_FEET

Scale bar display units : Feet

See Also:

Constant Field Values

UNITS_MILES

public static final int UNITS_MILES

Scale bar display units : Miles

See Also:

Constant Field Values

TYPE_ALTERNATING

public static final String TYPE_ALTERNATING

Alternating

See Also:

Constant Field Values

TYPE_DOUBLE_ALTERNATING

public static final String TYPE_DOUBLE_ALTERNATING

Double Alternating

See Also:

Constant Field Values

TYPE_SINGLE_DIVISION

public static final String TYPE_SINGLE_DIVISION

Single Division

See Also:

Constant Field Values

TYPE_STEPPED_SCALE_LINE

public static final String TYPE_STEPPED_SCALE_LINE

Stepped Scale Line

See Also:

Constant Field Values

POSITION_BOTTOM_LEFT

public static final String POSITION_BOTTOM_LEFT

Position of scabe bar within map control : bottom-left

See Also:

Constant Field Values

POSITION_BOTTOM_RIGHT

public static final String POSITION_BOTTOM_RIGHT

Position of scabe bar within map control : bottom-right

See Also:

Constant Field Values

POSITION_TOP_RIGHT

public static final String POSITION_TOP_RIGHT

Position of scabe bar within map control : top-right

See Also:

Constant Field Values

POSITION_TOP_LEFT

public static final String POSITION_TOP_LEFT

Position of scabe bar within map control : top-left

See Also:

Constant Field Values

POSITION_NONE

public static final String POSITION_NONE

Position of scabe bar within map control : none

See Also:

Constant Field Values

Constructor Detail

WebScaleBar

public WebScaleBar()

Method Detail

init

public void init(WebContext webContext)

Implements WebContextInitialize.init(WebContext)

Specified by:

init in interface WebContextInitialize

Parameters:

webContext - WebContext- the WebContext

See Also:

WebContext.init(WebContext), WebContext.addResource(String, GISResource, int), WebContext.removeResource(GISResource)

update

public void update(WebContext webContext,
                   Object arg)

Implements WebContextObserver.update(WebContext, Object)

Specified by:

update in interface WebContextObserver

Parameters:

webContext - the WebContext that has been refreshed

arg - the argument passed to the WebContext's refresh(arg) method

See Also:

WebContext.refresh(Object), WebContext.addObserver(WebContextObserver), WebContext.removeObserver(WebContextObserver)

destroy

public void destroy()

Implements WebContext.destroy()

Specified by:

destroy in interface WebContextInitialize

See Also:

WebContext.destroy()

getImageUrl

public String getImageUrl()

If the scale bar uses a ScaleBarFunctionality, this method returns the URL to the image generated by calling ScaleBarFunctionality.exportImage().

setScaleBarFunctionality

public void setScaleBarFunctionality(ScaleBarFunctionality scaleBarFunctionality)

Set the ScaleBarFunctionality that must be used to render the scalebar.

Parameters:

scaleBarFunctionality -

getScaleBarFunctionality

public ScaleBarFunctionality getScaleBarFunctionality()

Return the scaleBarFunctionality used to draw the scale bar

setResourceId

public void setResourceId(String resourceId)

Set resource id to be used to retrieve scaleBarFunctionality.

Parameters:

resourceId -

getWidth

public int getWidth()

Get width of scale bar.

setWidth

public void setWidth(int width)

Set width of scale bar. If using functionality, this property is ignored. Default 200.

Parameters:

width - Width of scale bar in pixels.

getHeight

public int getHeight()

Get height of scale bar.

setHeight

public void setHeight(int height)

Set height of scale bar. If using functionality, this property is ignored. Default 40.

Parameters:

height - Height of scale bar in pixels.

getPosition

public String getPosition()

Get position of scale bar on the map control.

setPosition

public void setPosition(String position)

Set the position of the scale bar on the map control. Default POSITION_BOTTOM_LEFT.

Parameters:

position - Position of scale bar on map control. Possible values POSITION_BOTTOM_LEFT, POSITION_BOTTOM_RIGHT, POSITION_TOP_RIGHT, POSITION_TOP_LEFT, POSITION_NONE. If position is POSITION_NONE, style declared in esri_styles.css is applied.

getMapDistance

public double getMapDistance()

Get map distance represented by scale bar. If using functionality, this property is null.

getScreenDistance

public double getScreenDistance()

Get screen distance, in pixels to be drawn by scale bar. If using functionality, this property is null.

getMaxPrecision

public int getMaxPrecision()

Get maximum precision set.

setMaxPrecision

public void setMaxPrecision(int maxPrecision)

Set maximum precision. Max precision specifies the maximum that the decimal can be moved to the right to calculate map distance. If using functionality, this property is ignored. Default 10.

Parameters:

maxPrecision -

getType

public String getType()

Get the type of scale bar.

setType

public void setType(String type)

Set the type of scale bar to be rendered. If using functionality, this property is ignored.

Parameters:

type - Type of scale bar. Possible values, TYPE_ALTERNATING, TYPE_DOUBLE_ALTERNATING, TYPE_SINGLE_DIVISION, TYPE_STEPPED_SCALE_LINE. Default TYPE_ALTERNATING.

getUnits

public int getUnits()

Get the units to be shown in the scale bar.

setUnits

public void setUnits(int units)

Set the units of scale bar to be rendered. If using functionality, this property is ignored.

Parameters:

units - Type of scale bar. Possible values, UNITS_METERS, UNITS_KILOMETERS, UNITS_FEET, UNITS_MILES. Default UNITS_METERS.

isScaleBarAvailable

public boolean isScaleBarAvailable()

Returns true if this scale bar is available for use by the user.

The scale bar is available if it is associated with a ScaleBarFunctionality or if the WebContext has a spatial reference associated with it.

Returns:

true if this scale bar is available for use by the user