PTElement

@interface PTElement : NSObject

Element is the abstract interface used to access graphical elements used to build the display list.

Just like many other classes in PDFNet (e.g. ColorSpace, Font, Annot, etc), Element class follows the composite design pattern. This means that all Elements are accessed through the same interface, but depending on the Element type (that can be obtained using GetType()), only methods related to that type can be called. For example, if GetType() returns e_image, it is illegal to call a method specific to another Element type (i.e. a call to a text specific GetTextData() will throw an Exception).

  • Declaration

    Objective-C

    - (PTElementType)GetType;

    Swift

    func getType() -> PTElementType

    Return Value

    the current element type.

  • Declaration

    Objective-C

    - (PTGState *)GetGState;

    Swift

    func getGState() -> PTGState!

    Return Value

    GState of this Element

  • Declaration

    Objective-C

    - (PTMatrix2D *)GetCTM;

    Swift

    func getCTM() -> PTMatrix2D!

    Return Value

    Current Transformation Matrix (CTM) that maps coordinates to the initial user space.

  • Obtains the bounding box for a graphical element.

    Calculates the bounding box for a graphical element (i.e. an Element that belongs to one of following types: e_path, e_text, e_image, e_inline_image, e_shading e_form). The returned bounding box is guaranteed to encompass the Element, but is not guaranteed to be the smallest box that could contain the element. For example, for Bezier curves the bounding box will enclose all control points, not just the curve itself.

    Declaration

    Objective-C

    - (PTPDFRect *)GetBBox;

    Swift

    func getBBox() -> PTPDFRect!

    Parameters

    out_bbox

    (Filled by the method) A reference to a rectangle specifying the bounding box of Element (a rectangle that surrounds the entire element). The coordinates are represented in the default PDF page coordinate system and are using units called points ( 1 point = 1/72 inch = 2.54 /72 centimeter). The bounding box already accounts for the effects of current transformation matrix (CTM), text matrix, font size, and other properties in the graphics state. If this is a non-graphical element (i.e. the method returns false) the bounding box is undefined.

    Return Value

    true if this is a graphical element and the bounding box can be calculated; false for non-graphical elements which don’t have bounding box.

  • Declaration

    Objective-C

    - (PTSElement *)GetParentStructElement;

    Swift

    func getParentStructElement() -> PTSElement!

    Return Value

    Parent logical structure element (such as ‘span’ or ‘paragraph’). If the Element is not associated with any structure element, the returned SElement will not be valid (i.e. selem.IsValid() -> false).

  • Marked content identifier can be used to associate an Element with logical structure element that refers to the Element.

    Declaration

    Objective-C

    - (int)GetStructMCID;

    Swift

    func getStructMCID() -> Int32

    Return Value

    Marked Content Identifier (MCID) for this Element or a negative number if the element is not assigned an identifier/MCID.

  • When enumerating page content, OCG::Context can be passed as a parameter in ElementReader.Begin() method. When using PDFDraw, PDFRasterizer, or PDFView class to render PDF pages use PDFDraw::SetOCGContext() method to select an OC context.

    Declaration

    Objective-C

    - (BOOL)IsOCVisible;

    Swift

    func isOCVisible() -> Bool

    Return Value

    true if this element is visible in the optional-content context (OCG::Context). The method considers the context’s current OCMD stack, the group ON-OFF states, the non-OC drawing status, the drawing and enumeration mode, and the intent.

  • Declaration

    Objective-C

    - (BOOL)IsClippingPath;

    Swift

    func isClippingPath() -> Bool

    Return Value

    true if the current path element is a clipping path and should be added to clipping path stack.

  • Declaration

    Objective-C

    - (BOOL)IsStroked;

    Swift

    func isStroked() -> Bool

    Return Value

    true if the current path element should be stroked

  • Declaration

    Objective-C

    - (BOOL)IsFilled;

    Swift

    func isFilled() -> Bool

    Return Value

    true if the current path element should be filled

  • According non-zero winding rule, you can determine whether a test point is inside or outside a closed curve as follows: Draw a line from a test point to a point that is distant from the curve. Count the number of times the curve crosses the test line from left to right, and count the number of times the curve crosses the test line from right to left. If those two numbers are the same, the test point is outside the curve; otherwise, the test point is inside the curve.

    According to even-odd rule, you can determine whether a test point is inside or outside a closed curve as follows: Draw a line from the test point to a point that is distant from the curve. If that line crosses the curve an odd number of times, the test point is inside the curve; otherwise, the test point is outside the curve.

    Declaration

    Objective-C

    - (BOOL)IsWindingFill;

    Swift

    func isWindingFill() -> Bool

    Return Value

    true if the current path should be filled using non-zero winding rule, or false if the path should be filled using even-odd rule.

  • Declaration

    Objective-C

    - (BOOL)IsClipWindingFill;

    Swift

    func isClipWindingFill() -> Bool

    Return Value

    true if the current clip path is using non-zero winding rule, or false for even-odd rule.

  • Returns the PathData stored by the path element.

    Declaration

    Objective-C

    - (PTPathData *)GetPathData;

    Swift

    func getPathData() -> PTPathData!

    Return Value

    The PathData which contains the operators and corresponding point data.

  • Set the PathData of this element. The PathData contains the array of points stored by the element and the array of path segment types.

    Declaration

    Objective-C

    - (void)SetPathData:(PTPathData *)data;

    Swift

    func setPathData(_ data: PTPathData!)
  • Indicate whether the path is a clipping path or non-clipping path

    Declaration

    Objective-C

    - (void)SetPathClip:(BOOL)clip;

    Swift

    func setPathClip(_ clip: Bool)

    Parameters

    clip

    true to set path to clipping path. False for non-clipping path.

  • Indicate whether the path should be stroked

    Declaration

    Objective-C

    - (void)SetPathStroke:(BOOL)stroke;

    Swift

    func setPathStroke(_ stroke: Bool)

    Parameters

    stroke

    true to set path to be stroked. False for no stroke path.

  • Indicate whether the path should be filled

    Declaration

    Objective-C

    - (void)SetPathFill:(BOOL)fill;

    Swift

    func setPathFill(_ fill: Bool)

    Parameters

    fill

    true to set path to be filled. False for no fill path.

  • Sets path’s fill rule.

    Declaration

    Objective-C

    - (void)SetWindingFill:(BOOL)winding_rule;

    Swift

    func setWindingFill(_ winding_rule: Bool)

    Parameters

    winding_rule

    if winding_rule is true path will be filled using non-zero winding fill rule, otherwise even-odd fill will be used.

  • Sets clipping path’s fill rule.

    Declaration

    Objective-C

    - (void)SetClipWindingFill:(BOOL)winding_rule;

    Swift

    func setClipWindingFill(_ winding_rule: Bool)

    Parameters

    winding_rule

    if winding_rule is true clipping should use non-zero winding rule, or false for even-odd rule.

  • Declaration

    Objective-C

    - (PTObj *)GetXObject;

    Swift

    func getXObject() -> PTObj!

    Return Value

    the SDF object of the Image/Form object.

  • Declaration

    Objective-C

    - (PTFilter *)GetImageData;

    Swift

    func getImageData() -> PTFilter!

    Return Value

    A stream (filter) containing decoded image data

  • Declaration

    Objective-C

    - (int)GetImageDataSize;

    Swift

    func getImageDataSize() -> Int32

    Return Value

    the size of image data in bytes

  • The returned color space may be any type of color space except Pattern.

    Declaration

    Objective-C

    - (PTColorSpace *)GetImageColorSpace;

    Swift

    func getImageColorSpace() -> PTColorSpace!

    Return Value

    The SDF object representing the color space in which image are specified or NULL if the image is an image mask

  • Declaration

    Objective-C

    - (int)GetImageWidth;

    Swift

    func getImageWidth() -> Int32

    Return Value

    the width of the image, in samples.

  • Declaration

    Objective-C

    - (int)GetImageHeight;

    Swift

    func getImageHeight() -> Int32

    Return Value

    the height of the image, in samples.

  • Declaration

    Objective-C

    - (PTObj *)GetDecodeArray;

    Swift

    func getDecodeArray() -> PTObj!

    Return Value

    Decode array or NULL if the parameter is not specified. A decode object is an array of numbers describing how to map image samples into the range of values appropriate for the color space of the image. If ImageMask is true, the array must be either [0 1] or [1 0]; otherwise, its length must be twice the number of color components required by ColorSpace. Default value depends on the color space, See Table 4.36 in PDF Ref. Manual.

  • Declaration

    Objective-C

    - (int)GetBitsPerComponent;

    Swift

    func getBitsPerComponent() -> Int32

    Return Value

    the number of bits used to represent each color component. Only a single value may be specified; the number of bits is the same for all color components. Valid values are 1, 2, 4, and 8.

  • Declaration

    Objective-C

    - (int)GetComponentNum;

    Swift

    func getComponentNum() -> Int32

    Return Value

    the number of color components per sample.

  • Declaration

    Objective-C

    - (BOOL)IsImageMask;

    Swift

    func isImageMask() -> Bool

    Return Value

    a boolean indicating whether the inline image is to be treated as an image mask.

  • Declaration

    Objective-C

    - (BOOL)IsImageInterpolate;

    Swift

    func isImageInterpolate() -> Bool

    Return Value

    a boolean indicating whether image interpolation is to be performed.

  • If IsImageMask() return true, this method will return NULL.

    Declaration

    Objective-C

    - (PTObj *)GetMask;

    Swift

    func getMask() -> PTObj!

    Return Value

    an image XObject defining an image mask to be applied to this image (See ‘Explicit Masking’, 4.8.5), or an array specifying a range of colors to be applied to it as a color key mask (See ‘Color Key Masking’).

  • Declaration

    Objective-C

    - (PTRenderingIntent)GetImageRenderingIntent;

    Swift

    func getImageRenderingIntent() -> PTRenderingIntent

    Return Value

    The color rendering intent to be used in rendering the image.

  • Note

    In PDF text can be encoded using various encoding schemes and in some cases it is not possible to extract Unicode encoding. If it is not possible to map charcode to Unicode the function will map a character to undefined code, 0xFFFD. This code is defined in private Unicode range.

    Note

    If you would like to map raw text to Unicode (or some other encoding) yourself use CharIterators returned by CharBegin()/CharEnd() and PDF::Font code mapping methods.

    Note

    The string owner is the current element (i.e. ElementReader or ElementBuilder).

    Declaration

    Objective-C

    - (NSString *)GetTextString;

    Swift

    func getTextString() -> String!

    Return Value

    a pointer to Unicode string for this text Element. The function maps character codes to Unicode array defined by Adobe Glyph List (http://partners.adobe.com/asn/developer/type/glyphlist.txt).

  • Note

    GetTextData() returns the raw text data and not a Unicode string. In PDF text can be encoded using various encoding schemes so it is necessary to consider Font encoding while processing the content of this buffer.

    Note

    Most of the time GetTextString() is what you are looking for instead. GetTextString() maps the raw text directly into Unicode (as specified by Adobe Glyph List (AGL) ). Even if you would prefer to decode text yourself it is more convenient to use CharIterators returned by CharBegin()/CharEnd() and PDF::Font code mapping methods.

    Note

    the buffer owner is the current element (i.e. ElementReader or ElementBuilder).

    Declaration

    Objective-C

    - (NSData *)GetTextData;

    Swift

    func getTextData() -> Data!

    Return Value

    a pointer to the internal text buffer for this text element.

  • Declaration

    Objective-C

    - (unsigned int)GetTextDataSize;

    Swift

    func getTextDataSize() -> UInt32

    Return Value

    the size of the internal text buffer returned in GetTextData().

  • Declaration

    Objective-C

    - (PTMatrix2D *)GetTextMatrix;

    Swift

    func getTextMatrix() -> PTMatrix2D!

    Return Value

    a reference to the current text matrix ™.

  • CharIterator points to CharData. CharData is a data structure that contains the char_code number (used to retrieve glyph outlines, to map to Unicode, etc.), character positioning information (x, y), and the number of bytes taken by the character within the text buffer.

    Note

    CharIterator follows the standard STL forward-iterator interface.

    An example of how to use CharIterator.

         for (CharIterator itr = element.GetCharIterator(); itr.HasNext(); itr.Next()) {
                unsigned int char_code = itr.Current().char_code;
                double char_pos_x = itr.Current().x;
                double char_pos_y = itr.Current().y;
         }
    

    Note

    Character positioning information (x, y) is represented in text space. In order to get the positioning in the user space, the returned value should be scaled using the text matrix (GetTextMatrix()) and the current transformation matrix (GetCTM()). See section 4.2 ‘Other Coordinate Spaces’ in PDF Reference Manual for details and PDFNet FAQ - How do I get absolute/relative text and character positioning?.

    Note

    within a text run a character may occupy more than a single byte (e.g. in case of composite/Type0 fonts). The role of CharIterator/CharData is to provide a uniform and easy to use interface to access character information.

    Declaration

    Objective-C

    - (PTCharIterator *)GetCharIterator;

    Swift

    func getCharIterator() -> PTCharIterator!

    Return Value

    a CharIterator addressing the first CharData element in the text run.

  • The total sum of all of the advance values from rendering all of the characters within this element, including the advance value on the glyphs, the effect of properties such as ‘char-spacing’, ‘word-spacing’ and positioning adjustments on ‘TJ’ elements.

    Note

    Computed text length is represented in text space. In order to get the length of the text run in the user space, the returned value should be scaled using the text matrix (GetTextMatrix()) and the current transformation matrix (GetCTM()). See section 4.2 ‘Other Coordinate Spaces’ in PDF Reference Manual for details.

    Declaration

    Objective-C

    - (double)GetTextLength;

    Swift

    func getTextLength() -> Double

    Return Value

    The text advance distance in text space.

  • Note

    because CharIterator positioning information already accounts for TJ adjustments this method is rarely used.

    Declaration

    Objective-C

    - (double)GetPosAdjustment;

    Swift

    func getPosAdjustment() -> Double

    Return Value

    The number used to adjust text matrix in horizontal direction when drawing text. The number is expressed in thousandths of a unit of text space. The returned number corresponds to a number value within TJ array. For ‘Tj’ text strings the returned value is always 0.

  • Returns the offset (out_x, out_y) to the start of the current line relative to the beginning of the previous line.

    out_x and out_y are numbers expressed in unscaled text space units. The returned numbers correspond to the arguments of ‘Td’ operator.

    Declaration

    Objective-C

    - (PTPDFPoint *)GetNewTextLineOffset;

    Swift

    func getNewTextLineOffset() -> PTPDFPoint!
  • Sets the offset (dx, dy) to the start of the current line relative to the beginning of the previous line.

    Declaration

    Objective-C

    - (void)SetNewTextLineOffset:(double)dx dy:(double)dy;

    Swift

    func setNewTextLineOffset(_ dx: Double, dy: Double)

    Parameters

    dx

    horizontal offset to the start of the curret line

    dy

    vertical offset to the start of the current line

  • Declaration

    Objective-C

    - (BOOL)HasTextMatrix;

    Swift

    func hasTextMatrix() -> Bool

    Return Value

    true if this element is directly associated with a text matrix (that is Tm operator is just before this text element) or false if the text matrix is default or is inherited from previous text elements.

  • Set the text data for the current e_text Element.

    Declaration

    Objective-C

    - (void)SetTextData:(NSData *)buf_text_data text_data_size:(int)text_data_size;

    Swift

    func setTextData(_ buf_text_data: Data!, text_data_size: Int32)

    Parameters

    buf_text_data

    a pointer to a buffer containing text.

    text_data_size

    the size of the internal text buffer

  • Sets the text matrix for a text element.

    Declaration

    Objective-C

    - (void)SetTextMatrixWithMatrix2D:(PTMatrix2D *)mtx;

    Swift

    func setTextMatrix(with mtx: PTMatrix2D!)

    Parameters

    mtx

    The new text matrix for this text element

  • Sets the text matrix for a text element. This method accepts text transformation matrix components directly.

    A transformation matrix in PDF is specified by six numbers, usually in the form of an array containing six elements. In its most general form, this array is denoted [a b c d h v]; it can represent any linear transformation from one coordinate system to another. For more information about PDF matrices please refer to section 4.2.2 ‘Common Transformations’ in PDF Reference Manual, and to documentation for Matrix2D class.

    Declaration

    Objective-C

    - (void)SetTextMatrix:(double)a
                        b:(double)b
                        c:(double)c
                        d:(double)d
                        h:(double)h
                        v:(double)v;

    Swift

    func setTextMatrix(_ a: Double, b: Double, c: Double, d: Double, h: Double, v: Double)

    Parameters

    a

    - horizontal ‘scaling’ component of the new text matrix.

    b

    - ‘rotation’ component of the new text matrix.

    c

    - ‘rotation’ component of the new text matrix.

    d

    - vertical ‘scaling’ component of the new text matrix.

    h

    - horizontal translation component of the new text matrix.

    v

    - vertical translation component of the new text matrix.

  • Note

    Positive values move the current text element backwards (along text direction). Negative values move the current text element forward (along text direction).

    Declaration

    Objective-C

    - (void)SetPosAdjustment:(double)adjust;

    Swift

    func setPosAdjustment(_ adjust: Double)

    Parameters

    adjust

    number to set the horizontal adjustment to

  • Recompute the character positioning information (i.e. CharIterator-s) and text length.

    Element objects caches text length and character positioning information. If the user modifies the text data or graphics state the cached information is not correct. UpdateTextMetrics() can be used to recalculate the correct positioning and length information.

    Declaration

    Objective-C

    - (void)UpdateTextMetrics;

    Swift

    func updateTextMetrics()
  • Declaration

    Objective-C

    - (PTShading *)GetShading;

    Swift

    func getShading() -> PTShading!

    Return Value

    the SDF object of the Shading object.

  • Note

    the function automatically looks under Properties sub-dictionary of the current resource dictionary if the dictionary is not in-line. Therefore you can assume that returned Obj is dictionary if it is not NULL.

    Declaration

    Objective-C

    - (PTObj *)GetMCPropertyDict;

    Swift

    func getMCPropertyDict() -> PTObj!

    Return Value

    a dictionary containing the property list or NULL if property dictionary is not present.

  • Declaration

    Objective-C

    - (PTObj *)GetMCTag;

    Swift

    func getMCTag() -> PTObj!

    Return Value

    a tag is a name object indicating the role or significance of the marked content point/sequence.

  • Undocumented

    Declaration

    Objective-C

    - (instancetype)init;

    Swift

    init!()