Class JXG.Text
JXG.GeometryElement,JXG.CoordsElement
↳ JXG.Text
Creates a new text object. Do not use this constructor to create a text. Use JXG.Board#create with
type Text instead.
Defined in: text.js.
Extends
JXG.CoordsElement, JXG.GeometryElement.
| Constructor Attributes | Constructor Name and Description |
|---|---|
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JXG.Text(board, coordinates, attributes, content)
Construct and handle texts.
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- Fields borrowed from class JXG.GeometryElement:
- _org_type, _pos, ancestors, baseElement, board, childElements, dash, dashScale, descendants, draft, dragToTopOfLayer, dump, elementClass, elType, fillColor, fillOpacity, fixed, frozen, gradient, gradientAngle, gradientCX, gradientCY, gradientEndOffset, gradientFR, gradientFX, gradientFY, gradientR, gradientSecondColor, gradientSecondOpacity, gradientStartOffset, hasLabel, highlight, highlighted, highlightFillColor, highlightFillOpacity, highlightStrokeColor, highlightStrokeOpacity, highlightStrokeWidth, id, inherits, isDraggable, isLabel, isReal, lastDragTime, layer, lineCap, methodMap, mouseover, name, needsRegularUpdate, needsUpdate, nonnegativeOnly, notExistingParents, numTraces, parents, precision, priv, quadraticform, rendNode, rotatable, scalable, shadow, snapToGrid, stdform, strokeColor, strokeOpacity, strokeWidth, subs, symbolic, tabindex, trace, traceAttributes, traces, transformations, transitionDuration, transitionProperties, type, viewport, visible, visProp, visPropCalc, withLabel
- Fields borrowed from class JXG.CoordsElement:
- coords, groups, isConstrained, needsUpdateFromParent, onPolygon, position, slideObject, slideObjects
| Field Attributes | Field Name and Description |
|---|---|
| <private> |
Width and height of the text element in pixel.
|
- Fields borrowed from class JXG.GeometryElement:
- _org_type, _pos, ancestors, baseElement, board, childElements, dash, dashScale, descendants, draft, dragToTopOfLayer, dump, elementClass, elType, fillColor, fillOpacity, fixed, frozen, gradient, gradientAngle, gradientCX, gradientCY, gradientEndOffset, gradientFR, gradientFX, gradientFY, gradientR, gradientSecondColor, gradientSecondOpacity, gradientStartOffset, hasLabel, highlight, highlighted, highlightFillColor, highlightFillOpacity, highlightStrokeColor, highlightStrokeOpacity, highlightStrokeWidth, id, inherits, isDraggable, isLabel, isReal, lastDragTime, layer, lineCap, methodMap, mouseover, name, needsRegularUpdate, needsUpdate, nonnegativeOnly, notExistingParents, numTraces, parents, precision, priv, quadraticform, rendNode, rotatable, scalable, shadow, snapToGrid, stdform, strokeColor, strokeOpacity, strokeWidth, subs, symbolic, tabindex, trace, traceAttributes, traces, transformations, transitionDuration, transitionProperties, type, viewport, visible, visProp, visPropCalc, withLabel
- Fields borrowed from class JXG.CoordsElement:
- coords, groups, isConstrained, needsUpdateFromParent, onPolygon, position, slideObject, slideObjects
| Method Attributes | Method Name and Description |
|---|---|
| <private> |
_createFctUpdateText(text)
This sets the updateText function of this element depending on the type of text content passed.
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| <private> |
_setText(text)
Defines new content.
|
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bounds()
Returns the bounding box of the text element in user coordinates as an
array of length 4: [upper left x, upper left y, lower right x, lower right y].
|
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| <private> |
Used to save updateSize() calls.
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| <private> |
Converts the GEONExT tags
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| <private> |
convertGeonextAndSketchometry2CSS(s, escape)
Alias for convertGeonext2CSS and convertSketchometry2CSS
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| <private> |
convertSketchometry2CSS(s, escape)
Converts the sketchometry tag
|
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A very crude estimation of the dimensions of the textbox in case nothing else is available.
|
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| <private> |
escapeTicks(s)
Replace ticks by URI escape sequences
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| <private> |
expandShortMath(expr)
Converts shortened math syntax into correct syntax: 3x instead of 3*x or
(a+b)(3+1) instead of (a+b)*(3+1).
|
| <private> |
generateTerm(contentStr, expand, avoidGeonext2JS)
Converts the GEONExT syntax of the
|
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Returns the value of the attribute "anchorX".
|
|
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Returns the value of the attribute "anchorY".
|
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| <private> |
getNumberOfConflicts(x, y, w, h, whiteList)
Computes the number of overlaps of a box of w pixels width, h pixels height
and center (x, y)
|
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getSize()
Return the width of the text element.
|
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| <private> |
hasPoint(x, y)
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| <private> |
notifyParents(content)
Finds dependencies in a given term and notifies the parents by adding the
dependent object to the found objects child elements.
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| <private> |
poorMansTeX(s)
Simple math rendering using HTML / CSS only.
|
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replaceSub(te)
Replace _{} by <sub>
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|
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replaceSup(te)
Replace ^{} by <sup>
|
|
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Sets the offset of a label element to the position with the least number
of overlaps with other elements, while retaining the distance to its
anchor element.
|
|
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setCoords(x, y)
Move the text to new coordinates.
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|
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setText(text)
Defines new content.
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setTextJessieCode(text)
Defines new content but converts < and > to HTML entities before updating the DOM.
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| <private> |
Replace escape sequences for ticks by ticks
|
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update(fromParent)
Evaluates the text.
|
|
| <private> |
The update function of the renderer
is called.
|
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Recompute the width and the height of the text box.
|
|
| <private> |
Dynamically created function to update the content
of a text.
|
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utf8_decode(string)
Decode unicode entities into characters.
|
|
| <private> |
valueTagToJessieCode(contentStr)
Replace value-tags in string by JessieCode functions.
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- Methods borrowed from class JXG.GeometryElement:
- _set, addChild, addDescendants, addParents, addParentsFromJCFunctions, addRotation, addTicks, addTransform, animate, clearTrace, cloneToBackground, countChildren, createGradient, createLabel, draggable, formatNumberLocale, fullUpdate, generatePolynomial, getAttribute, getAttributes, getLabelAnchor, getName, getParents, getProperty, getSnapSizes, getTextAnchor, getType, handleSnapToGrid, hide, hideElement, noHighlight, normalize, prepareUpdate, remove, removeAllTicks, removeChild, removeDescendants, removeTicks, resolveShortcuts, setArrow, setAttribute, setDash, setDisplayRendNode, setLabel, setLabelText, setName, setParents, setPosition, setPositionDirectly, setProperty, show, showElement, snapToPoints, updateVisibility, useLocale
- Methods borrowed from class JXG.CoordsElement:
- _anim, addAnchor, addConstraint, Coords, Dist, findClosestSnapValue, free, handleAttractors, handleSnapToPoints, makeGlider, moveAlong, moveTo, popSlideObject, setGliderPosition, setPositionByTransform, updateConstraint, updateCoords, updateGlider, updateGliderFromParent, updateTransform, visit, X, XEval, Y, YEval, Z, ZEval
- Events borrowed from class JXG.GeometryElement:
- attribute, attribute:key, down, drag, keydrag, mousedown, mousedrag, mousemove, mouseout, mouseover, mouseup, move, out, over, pendown, pendrag, penup, touchdown, touchdrag, touchup, up
Class Detail
JXG.Text(board, coordinates, attributes, content)
Construct and handle texts.
The coordinates can be relative to the coordinates of an element
given in JXG.Options#text.anchor.
MathJax, HTML and GEONExT syntax can be handled.
- Parameters:
- {string|JXG.Board} board
- The board the new text is drawn on.
- {Array} coordinates
- An array with the user coordinates of the text.
- {Object} attributes
- An object containing visual properties and optional a name and a id.
- {string|function} content
- A string or a function returning a string.
Field Detail
<private>
{Array}
size
Width and height of the text element in pixel.
Method Detail
<private>
_createFctUpdateText(text)
This sets the updateText function of this element depending on the type of text content passed.
Used by JXG.Text#_setText.
- Parameters:
- {String|Function|Number} text
- See:
- JXG.Text#_setText
<private>
{JXG.Text}
_setText(text)
Defines new content. This is used by JXG.Text#setTextJessieCode and JXG.Text#setText. This is required because
JessieCode needs to filter all Texts inserted into the DOM and thus has to replace setText by setTextJessieCode.
- Parameters:
- {String|Function|Number} text
- Returns:
- {JXG.Text}
bounds()
Returns the bounding box of the text element in user coordinates as an
array of length 4: [upper left x, upper left y, lower right x, lower right y].
The method assumes that the lower left corner is at position [el.X(), el.Y()]
of the text element el, i.e. the attributes anchorX, anchorY are ignored.
or labels, [0, 0, 0, 0] is returned.
- Returns:
- Array
<private>
checkForSizeUpdate()
Used to save updateSize() calls.
Called in JXG.Text.update
That means this.update() has been called.
More tests are in JXG.Renderer.updateTextStyle. The latter tests
are one update off. But this should pose not too many problems, since
it affects fontSize and cssClass changes.
<private>
convertGeonext2CSS(s)
Converts the GEONExT tags and to
HTML span tags with proper CSS formatting.
- Parameters:
- s
- See:
- JXG.Text.poorMansTeX
- JXG.Text._setText
<private>
convertGeonextAndSketchometry2CSS(s, escape)
Alias for convertGeonext2CSS and convertSketchometry2CSS
- Parameters:
- {String|Function|Number} s
- Text
- {Boolean} escape
- Flag if ticks should be escaped
- See:
- JXG.Text.convertGeonext2CSS
- JXG.Text.convertSketchometry2CSS
<private>
convertSketchometry2CSS(s, escape)
Converts the sketchometry tag to
HTML span tags with proper CSS formatting.
- Parameters:
- {String|Function|Number} s
- Text
- {Boolean} escape
- Flag if ticks should be escaped. Escaping is necessary if s is a text. It has to be avoided if s is a function returning text.
- See:
- JXG.Text._setText
- JXG.Text.convertGeonextAndSketchometry2CSS
{Array}
crudeSizeEstimate()
A very crude estimation of the dimensions of the textbox in case nothing else is available.
- Returns:
- {Array}
<private>
escapeTicks(s)
Replace ticks by URI escape sequences
- Parameters:
- {String} s
- Returns:
- String
<private>
{string}
expandShortMath(expr)
Converts shortened math syntax into correct syntax: 3x instead of 3*x or
(a+b)(3+1) instead of (a+b)*(3+1).
- Parameters:
- expr
- Returns:
- {string} expanded String
<private>
generateTerm(contentStr, expand, avoidGeonext2JS)
Converts the GEONExT syntax of the terms into JavaScript.
Also, all Objects whose name appears in the term are searched and
the text is added as child to these objects.
This method is called if the attribute parse==true is set.
Obsolete, replaced by JXG.Text.valueTagToJessieCode
- Parameters:
- contentStr
- expand
- avoidGeonext2JS
- See:
- JXG.GeonextParser#geonext2JS
- JXG.Text#valueTagToJessieCode
getAnchorX()
Returns the value of the attribute "anchorX". If this equals "auto",
returns "left", "middle", or "right", depending on the
value of the attribute "position".
- Returns:
- String
getAnchorY()
Returns the value of the attribute "anchorY". If this equals "auto",
returns "bottom", "middle", or "top", depending on the
value of the attribute "position".
- Returns:
- String
<private>
{Number}
getNumberOfConflicts(x, y, w, h, whiteList)
Computes the number of overlaps of a box of w pixels width, h pixels height
and center (x, y)
- Parameters:
- {Number} x
- x-coordinate of the center (screen coordinates)
- {Number} y
- y-coordinate of the center (screen coordinates)
- {Number} w
- width of the box in pixel
- {Number} h
- width of the box in pixel
- {Array} whiteList Optional
- array of ids which should be ignored
- Returns:
- {Number} Number of overlapping elements
{Array}
getSize()
Return the width of the text element.
- Returns:
- {Array} [width, height] in pixel
<private>
{Boolean}
hasPoint(x, y)
- Parameters:
- {Number} x
- {Number} y
- Returns:
- {Boolean}
<private>
notifyParents(content)
Finds dependencies in a given term and notifies the parents by adding the
dependent object to the found objects child elements.
- Parameters:
- {String} content
- String containing dependencies for the given object.
<private>
{String|Array}
poorMansTeX(s)
Simple math rendering using HTML / CSS only. In case of array,
handle each entry separately and return array with the
rendering strings.
- Parameters:
- {String|Array} s
- Returns:
- {String|Array}
- See:
- JXG.Text#convertGeonextAndSketchometry2CSS
- JXG.Text#replaceSub
- JXG.Text#replaceSup
- JXG.Text#convertGeonextAndSketchometry2CSS
{String}
replaceSub(te)
Replace _{} by <sub>
- Parameters:
- {String} te
- String containing _{}.
- Returns:
- {String} Given string with _{} replaced by <sub>.
{String}
replaceSup(te)
Replace ^{} by <sup>
- Parameters:
- {String} te
- String containing ^{}.
- Returns:
- {String} Given string with ^{} replaced by <sup>.
{JXG.Text}
setAutoPosition()
Sets the offset of a label element to the position with the least number
of overlaps with other elements, while retaining the distance to its
anchor element. Twelve different angles are possible.
- Returns:
- {JXG.Text} Reference to the text object.
{object}
setCoords(x, y)
Move the text to new coordinates.
- Parameters:
- {number} x
- {number} y
- Returns:
- {object} reference to the text object.
{JXG.Text}
setText(text)
Defines new content.
- Parameters:
- {String|function} text
- Returns:
- {JXG.Text} Reference to the text object.
setTextJessieCode(text)
Defines new content but converts < and > to HTML entities before updating the DOM.
- Parameters:
- {String|function} text
<private>
unescapeTicks(s)
Replace escape sequences for ticks by ticks
- Parameters:
- {String} s
- Returns:
- String
update(fromParent)
Evaluates the text.
Then, the update function of the renderer
is called.
- Parameters:
- fromParent
<private>
updateRenderer()
The update function of the renderer
is called.
{this}
updateSize()
Recompute the width and the height of the text box.
Updates the array JXG.Text#size with pixel values.
The result may differ from browser to browser
by some pixels.
In canvas an old IEs we use a very crude estimation of the dimensions of
the textbox.
JSXGraph needs JXG.Text#size for applying rotations in IE and
for aligning text.
- Returns:
- {this} [description]
<private>
updateText()
Dynamically created function to update the content
of a text. Can not be overwritten.
<value> tags will not be evaluated if text is provided by a function
Sets the property plaintext of the text element.
{String}
utf8_decode(string)
Decode unicode entities into characters.
- Parameters:
- {String} string
- Returns:
- {String}
<private>
valueTagToJessieCode(contentStr)
Replace value-tags in string by JessieCode functions.
- Parameters:
- {String} contentStr
- Returns:
- String
- Examples:
"The x-coordinate of A is <value>X(A)</value>"