Backup of Flash/SWF/spec/Shapes (No. 2)

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  • 1 (2009-08-03 (Mon) 11:24:50)
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  • 5 (2009-08-04 (Tue) 19:23:49)
  • 6 (2009-08-04 (Tue) 23:24:55)

Shapes

• The SWF shape architecture is designed to be compact, flexible and rendered very quickly to the screen.
• It is similar to most vector formats in that shapes are defined by a list of edges called a path.
• A path may be closed, where the start and end of the path meet to close the figure, or open, where the path forms an open-ended stroke.
• A path may contain a mixture of straight edges, curved edges, and ‘pen up and move’ commands.
• The latter allows multiple disconnected figures to be described by a single shape structure.
• A fill style defines the appearance of an area enclosed by a path.
• Fill styles supported by the SWF file format include a color, a gradient, or a bitmap image.
• A line style defines the appearance of the outline of a path.
• The line style may be a stroke of any thickness and color.
• Most vector formats allow only one fill and line style per path.
• The SWF file format extends this concept by allowing each edge to have its own line and fill style.
• This can have unpredictable results when fill styles change in the middle of a path.
• The Adobe Flash authoring tool also supports two fill styles per edge, one for each side of the edge:
  • FillStyle0 and FillStyle1. FillStyle0 should always be used first and then FillStyle1 if the shape is filled on both sides of the edge.

Shape overview

• shape は以下の要素で構成される。
• CharacterId
  • A 16-bit value that uniquely identifies this shape as a ‘character’ in the dictionary.
  • The CharacterId can be referred to in control tags such as PlaceObject.
  • Characters can be reused and combined with other characters to make more complex shapes.
• Bounding box
  • The rectangle that completely encloses the shape.
• Fill style array
  • A list of all the fill styles used in a shape.
• Line style array
  • A list of all the line styles used in a shape.
• Shape record array
  • A list of shape records. Shape records can define straight or curved edges, style changes, or move the drawing position.
• NOTE
  • Line and fill styles are defined only once and may be used (and reused) by any of the edges in the shape.

Shape example

Shape structures

Fill styles

Line styles

Shape structures

Shape records

Edge records

Shape tags