Package eu.webtoolkit.jwt

Class WSvgImage

java.lang.Object

eu.webtoolkit.jwt.WObject

eu.webtoolkit.jwt.WResource

eu.webtoolkit.jwt.WSvgImage

All Implemented Interfaces:

WPaintDevice, WVectorImage

public class WSvgImage
extends WResource
implements WVectorImage

A paint device for rendering using Scalable Vector Graphics (SVG).

The WSvgImage is primarily used by WPaintedWidget to render to the browser in Support Vector Graphics (SVG) format.

Nested Class Summary

Nested classes/interfaces inherited from class eu.webtoolkit.jwt.WResource

WResource.DispositionType

Nested classes/interfaces inherited from class eu.webtoolkit.jwt.WObject

WObject.FormData

Constructor Summary

Constructors

Constructor	Description
WSvgImage(WLength width, WLength height)	Create an SVG paint device.
WSvgImage(WLength width, WLength height, boolean paintUpdate)	Create an SVG paint device.

Method Summary

Modifier and Type	Method	Description
void	done()	Finishes painting on the device.
void	drawArc(WRectF rect, double startAngle, double spanAngle)	Draws an arc.
void	drawImage(WRectF rect, String imgUri, int imgWidth, int imgHeight, WRectF srect)	Draws an image.
void	drawLine(double x1, double y1, double x2, double y2)	Draws a line.
void	drawPath(WPainterPath path)	Draws a path.
void	drawRect(WRectF rectangle)	Draws a rectangle.
void	drawText(WRectF rect, EnumSet<AlignmentFlag> flags, TextFlag textFlag, CharSequence text, WPointF clipPoint)	Draws text.
EnumSet<PaintDeviceFeatureFlag>	getFeatures()	Returns device features.
WFontMetrics	getFontMetrics()	Returns font metrics.
WLength	getHeight()	Returns the device height.
WPainter	getPainter()	Returns the painter that is currently painting on the device.
String	getRendered()	Internal method.
WLength	getWidth()	Returns the device width.
void	handleRequest(WebRequest request, WebResponse response)	Handles a request.
void	init()	Initializes the device for painting.
boolean	isPaintActive()	Returns whether painting is active.
WTextItem	measureText(CharSequence text, double maxWidth, boolean wordWrap)	Measures rendered text size.
void	setChanged(EnumSet<PainterChangeFlag> flags)	Indicates changes in painter state.
void	setPainter(WPainter painter)	Sets the painter.

Methods inherited from class eu.webtoolkit.jwt.WResource

dataChanged, dataExceeded, dataReceived, generateUrl, getDispositionType, getInternalPath, getSuggestedFileName, getUrl, getVersion, incrementVersion, isInvalidAfterChanged, setChanged, setDispositionType, setInternalPath, setInvalidAfterChanged, setTakesUpdateLock, setUploadProgress, suggestFileName, suggestFileName, takesUpdateLock, write, write

Methods inherited from class eu.webtoolkit.jwt.WObject

getId, getObjectName, remove, setFormData, setObjectName, tr

Methods inherited from class java.lang.Object

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

Methods inherited from interface eu.webtoolkit.jwt.WPaintDevice

measureText, measureText, setChanged

Constructor Details

WSvgImage

public WSvgImage(WLength width,
 WLength height,
 boolean paintUpdate)

Create an SVG paint device.

If paintUpdate is true, then only an SVG fragment will be rendered that can be used to update the DOM of an existing SVG image, instead of a full SVG image.

WSvgImage

public WSvgImage(WLength width,
 WLength height)

Create an SVG paint device.

Calls this(width, height, false)

Method Details

getFeatures

public EnumSet<PaintDeviceFeatureFlag> getFeatures()

Description copied from interface: WPaintDevice

Returns device features.

Specified by:

getFeatures in interface WPaintDevice

setChanged

public void setChanged(EnumSet<PainterChangeFlag> flags)

Description copied from interface: WPaintDevice

Indicates changes in painter state.

The flags argument is the logical OR of one or more change flags.

Specified by:

setChanged in interface WPaintDevice

drawArc

public void drawArc(WRectF rect,
 double startAngle,
 double spanAngle)

Description copied from interface: WPaintDevice

Draws an arc.

The arc describes the segment of an ellipse enclosed by the rect. The segment starts at startAngle, and spans an angle given by spanAngle. These angles have as unit degree, and are measured counter-clockwise starting from the 3 o'clock position.

The arc must be stroked, filled, and transformed using the current painter settings.

Specified by:

drawArc in interface WPaintDevice

drawImage

public void drawImage(WRectF rect,
 String imgUri,
 int imgWidth,
 int imgHeight,
 WRectF srect)

Description copied from interface: WPaintDevice

Draws an image.

Draws sourceRect from the image with URL imageUri and original dimensions imgWidth and imgHeight to the location, into the rectangle defined by rect.

The image is transformed using the current painter settings.

Specified by:

drawImage in interface WPaintDevice

drawLine

public void drawLine(double x1,
 double y1,
 double x2,
 double y2)

Description copied from interface: WPaintDevice

Draws a line.

The line must be stroked and transformed using the current painter settings.

Specified by:

drawLine in interface WPaintDevice

drawRect

public void drawRect(WRectF rectangle)

Description copied from interface: WPaintDevice

Draws a rectangle.

The rect must be stroked, filled, and transformed using the current painter settings.

Specified by:

drawRect in interface WPaintDevice

drawPath

public void drawPath(WPainterPath path)

Description copied from interface: WPaintDevice

Draws a path.

The path must be stroked, filled, and transformed using the current painter settings.

Specified by:

drawPath in interface WPaintDevice

drawText

public void drawText(WRectF rect,
 EnumSet<AlignmentFlag> flags,
 TextFlag textFlag,
 CharSequence text,
 WPointF clipPoint)

Description copied from interface: WPaintDevice

Draws text.

The text must be rendered, stroked and transformed using the current painter settings.

If clipPoint is not null, a check is performed whether the point is inside of the current clip area. If not, the text is not drawn.

Specified by:

drawText in interface WPaintDevice

measureText

public WTextItem measureText(CharSequence text,
 double maxWidth,
 boolean wordWrap)

Description copied from interface: WPaintDevice

Measures rendered text size.

Returns the bounding rect of the given text when rendered using the current font.

If maxWidth != -1, then the text is truncated to fit in the width.

If wordWrap = true then text is truncated only at word boundaries. Note that in this case the whitespace at the truncated position is included in the text but not accounted for by the returned width (since usually you will not render the whitespace at the end of a line).

Throws a std::logic_error if the underlying device does not provide font metrics.

Specified by:

measureText in interface WPaintDevice

getFontMetrics

public WFontMetrics getFontMetrics()

Description copied from interface: WPaintDevice

Returns font metrics.

This returns font metrics for the current font.

Throws a std::logic_error if the underlying device does not provide font metrics.

Specified by:

getFontMetrics in interface WPaintDevice

init

public void init()

Description copied from interface: WPaintDevice

Initializes the device for painting.

This method is called when a WPainter starts painting.

Specified by:

init in interface WPaintDevice

See Also:

• WPainter.begin(WPaintDevice device)
• WPaintDevice.getPainter()

done

public void done()

Description copied from interface: WPaintDevice

Finishes painting on the device.

This method is called when a WPainter stopped painting.

Specified by:

done in interface WPaintDevice

See Also:

• WPainter.end()

isPaintActive

public boolean isPaintActive()

Description copied from interface: WPaintDevice

Returns whether painting is active.

Specified by:

isPaintActive in interface WPaintDevice

See Also:

• WPaintDevice.init()
• WPaintDevice.getPainter()

getRendered

public String getRendered()

Description copied from interface: WVectorImage

Internal method.

Specified by:

getRendered in interface WVectorImage

getWidth

public WLength getWidth()

Description copied from interface: WPaintDevice

Returns the device width.

The device width, in pixels, establishes the width of the device coordinate system.

Specified by:

getWidth in interface WPaintDevice

getHeight

public WLength getHeight()

Description copied from interface: WPaintDevice

Returns the device height.

The device height, in pixels, establishes the height of the device coordinate system.

Specified by:

getHeight in interface WPaintDevice

handleRequest

public void handleRequest(WebRequest request,
 WebResponse response)
                   throws IOException

Description copied from class: WResource

Handles a request.

Reimplement this method so that a proper response is generated for the given request. From the request object you can access request parameters and whether the request is a continuation request. In the response object, you should set the mime type and stream the output data.

Specified by:

handleRequest in class WResource

Parameters:

request - The request information

response - The response object

Throws:

IOException

getPainter

public WPainter getPainter()

Description copied from interface: WPaintDevice

Returns the painter that is currently painting on the device.

Specified by:

getPainter in interface WPaintDevice

See Also:

• WPaintDevice.init()

setPainter

public void setPainter(WPainter painter)

Description copied from interface: WPaintDevice

Sets the painter.

Specified by:

setPainter in interface WPaintDevice