# TextAssembler¶

from panda3d.core import TextAssembler

class TextAssembler

This class is not normally used directly by user code, but is used by the TextNode to lay out a block of text and convert it into rows of Geoms according to the TextProperties. However, user code may take advantage of it, if desired, for very low-level text operations.

Inheritance diagram

__init__(copy: TextAssembler)
__init__(encoder: TextEncoder)
assembleText()PandaNode

Actually assembles all of the text into a GeomNode, and returns the node (or possibly a parent of the node, to keep the shadow separate). Once this has been called, you may query the extents of the text via getUl(), getLr().

assign(copy: TextAssembler)TextAssembler
calcC(n: int)int

Computes the column index of the nth character or graphic object in the text and returns it.

If the nth character is not a normal printable character with a position in the wordwrapped string, returns -1 (for instance, a soft-hyphen character, or a newline character, may not have a corresponding position).

calcIndex(r: int, c: int)int

Computes the character index of the character at the rth row and cth column position. This is the inverse of calcRC().

It is legal for c to exceed the index number of the last column by 1, and it is legal for r to exceed the index number of the last row by 1, if c is 0.

calcR(n: int)int

Computes the row index of the nth character or graphic object in the text and returns it.

If the nth character is not a normal printable character with a position in the wordwrapped string, returns -1 (for instance, a soft-hyphen character, or a newline character, may not have a corresponding position).

static calcWidth(graphic: TextGraphic, properties: TextProperties)float

Returns the width of a single TextGraphic image.

static calcWidth(character: int, properties: TextProperties)float

Returns the width of a single character, according to its associated font. This also correctly calculates the width of cheesy ligatures and accented characters, which may not exist in the font as such.

This does not take kerning into account, however.

clear()None

Reinitializes the contents of the TextAssembler.

property dynamic_mergebool
Getter

Returns the dynamic_merge flag. See TextNode.setFlattenFlags().

Setter

Sets the dynamic_merge flag. See TextNode.setFlattenFlags().

getCharacter(n: int)int

Returns the character at the indicated position in the pre-wordwrapped string. If the object at this position is a graphic object instead of a character, returns 0.

getCharacter(r: int, c: int)int

Returns the character at the indicated position in the indicated row. If the object at this position is a graphic object instead of a character, returns 0.

getDynamicMerge()bool

Returns the dynamic_merge flag. See TextNode.setFlattenFlags().

getGraphic(n: int)TextGraphic

Returns the graphic object at the indicated position in the pre-wordwrapped string. If the object at this position is a character instead of a graphic object, returns NULL.

getGraphic(r: int, c: int)TextGraphic

Returns the graphic object at the indicated position in the indicated row. If the object at this position is a character instead of a graphic object, returns NULL.

getLr()LVector2

Returns the lower-right corner of the assembled text, in 2-d text coordinates.

getMaxRows()int

If max_rows is greater than zero, no more than max_rows will be accepted. Text beyond that will be truncated.

getMultilineMode()bool

Returns the multline_mode flag. See TextNode::set_multiline_mode().

getNumCharacters()int

Returns the number of characters of text, before wordwrapping.

getNumCols(r: int)int

Returns the number of characters and/or graphic objects in the nth row.

getNumRows()int

Returns the number of rows of text after it has all been wordwrapped and assembled.

getPlainWtext()str

Returns a wstring that represents the contents of the text, without any embedded properties characters. If there is an embedded graphic object, a zero value is inserted in that position.

This string has the same length as getNumCharacters(), and the characters in this string correspond one-to-one with the characters returned by get_character(n).

getProperties()TextProperties

Returns the default TextProperties that are applied to the text in the absence of any nested property change sequences.

getProperties(n: int)TextProperties

Returns the TextProperties in effect for the object at the indicated position in the pre-wordwrapped string.

getProperties(r: int, c: int)TextProperties

Returns the TextProperties in effect for the object at the indicated position in the indicated row.

getUl()LVector2

Returns the upper-left corner of the assembled text, in 2-d text coordinates.

getUsageHint() → UsageHint

Returns the UsageHint that will be applied to generated geometry. See setUsageHint().

getWidth(n: int)float

Returns the width of the character or object at the indicated position in the pre-wordwrapped string.

getWidth(r: int, c: int)float

Returns the width of the character or object at the indicated position in the indicated row.

getWordwrappedPlainWtext()str

Returns a wstring that represents the contents of the text, with newlines inserted according to the wordwrapping. The string will contain no embedded properties characters. If there is an embedded graphic object, a zero value is inserted in that position.

This string has the same number of newline characters as getNumRows(), and the characters in this string correspond one-to-one with the characters returned by get_character(r, c).

getWordwrappedWtext()str

Returns a wstring that represents the contents of the text, with newlines inserted according to the wordwrapping.

The string will contain embedded properties characters, which may not exactly match the embedded properties characters of the original string, but it will encode the same way.

Embedded properties characters will be closed before every newline, then reopened (if necessary) on the subsequent character following the newline. This means it will be safe to divide the text up at the newline characters and treat each line as an independent piece.

getWtext()str

Returns a wstring that represents the contents of the text.

The string will contain embedded properties characters, which may not exactly match the embedded properties characters of the original string, but it will encode the same way.

getXpos(r: int, c: int)float

Returns the x position of the origin of the character or graphic object at the indicated position in the indicated row.

It is legal for c to exceed the index number of the last column by 1, and it is legal for r to exceed the index number of the last row by 1, if c is 0.

getYpos(r: int, c: int)float

Returns the y position of the origin of all of the characters or graphic objects in the indicated row.

It is legal for r to exceed the index number of the last row by 1. The value of c is presently ignored.

static hasCharacter(character: int, properties: TextProperties)bool

Returns true if the named character exists in the font or can be synthesized by Panda, false otherwise. (Panda can synthesize some accented characters by combining similar-looking glyphs from the font.)

This returns true for whitespace and Unicode whitespace characters (if they exist in the font), but returns false for characters that would render with the “invalid glyph”.

static hasExactCharacter(character: int, properties: TextProperties)bool

Returns true if the named character exists in the font exactly as named, false otherwise. Note that because Panda can assemble glyphs together automatically using cheesy accent marks, this is not a reliable indicator of whether a suitable glyph can be rendered for the character. For that, use hasCharacter() instead.

This returns true for whitespace and Unicode whitespace characters (if they exist in the font), but returns false for characters that would render with the “invalid glyph”. It also returns false for characters that would be synthesized within Panda, but see hasCharacter().

static isWhitespace(character: int, properties: TextProperties)bool

Returns true if the indicated character represents whitespace in the font, or false if anything visible will be rendered for it.

This returns true for whitespace and Unicode whitespace characters (if they exist in the font), and returns false for any other characters, including characters that do not exist in the font (these would be rendered with the “invalid glyph”, which is visible).

Note that this function can be reliably used to identify Unicode whitespace characters only if the font has all of the whitespace characters defined. It will return false for any character not in the font, even if it is an official Unicode whitespace character.

property max_rowsint
Getter

If max_rows is greater than zero, no more than max_rows will be accepted. Text beyond that will be truncated.

Setter

If max_rows is greater than zero, no more than max_rows will be accepted. Text beyond that will be truncated.

Setting this will not truncate text immediately. You must follow this up with a call to setWtext() to truncate the existing text.

property multiline_modebool
Getter

Returns the multline_mode flag. See TextNode::set_multiline_mode().

Setter

Sets the multiline mode flag. Set the multiline mode to allow text to wrap. It defaults to true.

property propertiesTextProperties
Getter

Returns the default TextProperties that are applied to the text in the absence of any nested property change sequences.

Returns the TextProperties in effect for the object at the indicated position in the pre-wordwrapped string.

Returns the TextProperties in effect for the object at the indicated position in the indicated row.

Setter

Specifies the default TextProperties that are applied to the text in the absence of any nested property change sequences.

setDynamicMerge(dynamic_merge: bool)None

Sets the dynamic_merge flag. See TextNode.setFlattenFlags().

setMaxRows(max_rows: int)None

If max_rows is greater than zero, no more than max_rows will be accepted. Text beyond that will be truncated.

Setting this will not truncate text immediately. You must follow this up with a call to setWtext() to truncate the existing text.

setMultilineMode(flag: bool)None

Sets the multiline mode flag. Set the multiline mode to allow text to wrap. It defaults to true.

setProperties(properties: TextProperties)None

Specifies the default TextProperties that are applied to the text in the absence of any nested property change sequences.

setUsageHint(usage_hint: UsageHint)None

Specifies the UsageHint that will be applied to generated geometry. The default is UH_static, which is probably the right setting, but if you know the TextNode’s geometry will have a short lifespan, it may be better to set it to UH_stream. See geomEnums.h.

setWsubstr(wtext: str, start: int, count: int)bool

Replaces the ‘count’ characters from ‘start’ of the current text with the indicated replacement text. If the replacement text does not have count characters, the length of the string will be changed accordingly.

The substring may include nested formatting characters, but they must be self-contained and self-closed. The formatting characters are not literally saved in the internal string; they are parsed at the time of the setWsubstr() call.

The return value is true if all the text is accepted, or false if some was truncated (see setMaxRows()).

setWtext(wtext: str)bool

Accepts a new text string and associated properties structure, and precomputes the wordwrapping layout appropriately. After this call, getWordwrappedWtext() and getNumRows() can be called.

The return value is true if all the text is accepted, or false if some was truncated (see setMaxRows()).

property usage_hint → UsageHint
Getter

Returns the UsageHint that will be applied to generated geometry. See setUsageHint().

Setter

Specifies the UsageHint that will be applied to generated geometry. The default is UH_static, which is probably the right setting, but if you know the TextNode’s geometry will have a short lifespan, it may be better to set it to UH_stream. See geomEnums.h.