com.mxgraph.shape
Class mxCurveLabelShape

java.lang.Object
  com.mxgraph.shape.mxCurveLabelShape

All Implemented Interfaces:

mxITextShape

public class mxCurveLabelShape
extends Object
implements mxITextShape

Draws the edge label along a curve derived from the curve describing the edge's path

Nested Class Summary

class	mxCurveLabelShape.LabelGlyphCache Utility class to describe the characteristics of each glyph of a branch branch label.
class	mxCurveLabelShape.LabelPosition Utility class that stores details of how the label is positioned on the curve

Field Summary

int	centerVisibleIndex The index of the central glyph of the label that is visible
protected mxCurve	curve Cache of the points between which drawing straight lines views as a curve
static double	CURVE_TEXT_STRETCH_FACTOR Factor by which text on the inside of curve is stretched
static Object	FONT_FRACTIONALMETRICS Specifies if image aspect should be preserved in drawImage.
static FontRenderContext	frc Shared FRC for font size calculations
static mxRectangle	INVALID_GLYPH_BOUNDS Indicates that a glyph does not have valid drawing bounds, usually because it is not visible
static double	LABEL_BUFFER Buffer at both ends of the label
protected mxRectangle	labelBounds Cache of the bounds of the label
protected mxCurveLabelShape.LabelGlyphCache[]	labelGlyphs Cache of information describing characteristics relating to drawing each glyph of this label
protected mxCurveLabelShape.LabelPosition	labelPosition ADT to encapsulate label positioning information
protected double	labelSize Cache of the total length of the branch label
protected Font	lastFont Cache of the label font
protected List<mxPoint>	lastPoints Cache of the last set of guide points that this label was calculated for
protected String	lastValue Cache of the label text
protected boolean	rotationEnabled
GlyphVector[]	rtlGlyphVectors Cache of BIDI glyph vectors
protected mxCellState	state Cache the state associated with this shape

Constructor Summary

mxCurveLabelShape(mxCellState state, mxCurve value)

Method Summary

protected void	calculationLabelPosition(Map<String,Object> style, String label) Hook method to override how the label is positioned on the curve
mxRectangle	getCenterVisiblePosition() Returns the drawing bounds of the central indexed visible glyph
mxCurve	getCurve()
mxRectangle	getLabelBounds()
boolean	getRotationEnabled()
boolean	intersectsRect(Rectangle rect) Returns whether or not the rectangle passed in hits any part of this curve.
void	paintShape(mxGraphics2DCanvas canvas, String text, mxCellState state, Map<String,Object> style)
protected void	postprocessGlyph(mxCurve curve, String label, int j, double currentPos) Hook for sub-classers to perform additional processing on each glyph
void	setCurve(mxCurve curve)
void	setRotationEnabled(boolean value)
mxRectangle	updateLabelBounds(String label, Map<String,Object> style) Updates the cached position and size of each glyph in the edge label.

Methods inherited from class java.lang.Object

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

Field Detail

lastValue

protected String lastValue

Cache of the label text

lastFont

protected Font lastFont

Cache of the label font

lastPoints

protected List<mxPoint> lastPoints

Cache of the last set of guide points that this label was calculated for

curve

protected mxCurve curve

Cache of the points between which drawing straight lines views as a curve

state

protected mxCellState state

Cache the state associated with this shape

labelGlyphs

protected mxCurveLabelShape.LabelGlyphCache[] labelGlyphs

Cache of information describing characteristics relating to drawing each glyph of this label

labelSize

protected double labelSize

Cache of the total length of the branch label

labelBounds

protected mxRectangle labelBounds

Cache of the bounds of the label

labelPosition

protected mxCurveLabelShape.LabelPosition labelPosition

ADT to encapsulate label positioning information

LABEL_BUFFER

public static double LABEL_BUFFER

Buffer at both ends of the label

CURVE_TEXT_STRETCH_FACTOR

public static double CURVE_TEXT_STRETCH_FACTOR

Factor by which text on the inside of curve is stretched

INVALID_GLYPH_BOUNDS

public static mxRectangle INVALID_GLYPH_BOUNDS

Indicates that a glyph does not have valid drawing bounds, usually because it is not visible

centerVisibleIndex

public int centerVisibleIndex

The index of the central glyph of the label that is visible

FONT_FRACTIONALMETRICS

public static Object FONT_FRACTIONALMETRICS

Specifies if image aspect should be preserved in drawImage. Default is true.

rtlGlyphVectors

public GlyphVector[] rtlGlyphVectors

Cache of BIDI glyph vectors

frc

public static FontRenderContext frc

Shared FRC for font size calculations

rotationEnabled

protected boolean rotationEnabled

Constructor Detail

mxCurveLabelShape

public mxCurveLabelShape(mxCellState state,
                         mxCurve value)

Method Detail

getRotationEnabled

public boolean getRotationEnabled()

setRotationEnabled

public void setRotationEnabled(boolean value)

paintShape

public void paintShape(mxGraphics2DCanvas canvas,
                       String text,
                       mxCellState state,
                       Map<String,Object> style)

Specified by:

paintShape in interface mxITextShape

updateLabelBounds

public mxRectangle updateLabelBounds(String label,
                                     Map<String,Object> style)

Updates the cached position and size of each glyph in the edge label.

Parameters:

label - the entire string of the label.

style - the edge style

postprocessGlyph

protected void postprocessGlyph(mxCurve curve,
                                String label,
                                int j,
                                double currentPos)

Hook for sub-classers to perform additional processing on each glyph

Parameters:

curve - The curve object holding the label curve

label - the text label of the curve

j - the index of the label

currentPos - the distance along the label curve the glyph is

intersectsRect

public boolean intersectsRect(Rectangle rect)

Returns whether or not the rectangle passed in hits any part of this curve.

Parameters:

rect - the rectangle to detect for a hit

Returns:

whether or not the rectangle hits this curve

calculationLabelPosition

protected void calculationLabelPosition(Map<String,Object> style,
                                        String label)

Hook method to override how the label is positioned on the curve

Parameters:

style - the style of the curve

label - the string label to be displayed on the curve

getCurve

public mxCurve getCurve()

Returns:

the curve

setCurve

public void setCurve(mxCurve curve)

Parameters:

curve - the curve to set

getLabelBounds

public mxRectangle getLabelBounds()

getCenterVisiblePosition

public mxRectangle getCenterVisiblePosition()

Returns the drawing bounds of the central indexed visible glyph

Returns:

the centerVisibleIndex