| Package | starling.utils |
| Class | public class VertexData |
| Inheritance | VertexData  Object |
To render objects with Stage3D, you have to organize vertex data in so-called vertex buffers. Those buffers reside in graphics memory and can be accessed very efficiently by the GPU. Before you can move data into vertex buffers, you have to set it up in conventional memory - that is, in a Vector object. The vector contains all vertex information (the coordinates, color, and texture coordinates) - one vertex after the other.
To simplify creating and working with such a bulky list, the VertexData class was created. It contains methods to specify and modify vertex data. The raw Vector managed by the class can then easily be uploaded to a vertex buffer.
Premultiplied AlphaThe color values of the "BitmapData" object contain premultiplied alpha values, which
means that the rgb values were multiplied with the alpha value
before saving them. Since textures are created from bitmap data, they contain the values in
the same style. On rendering, it makes a difference in which way the alpha value is saved;
for that reason, the VertexData class mimics this behavior. You can choose how the alpha
values should be handled via the premultipliedAlpha property.
| Property | Defined By | ||
|---|---|---|---|
| numVertices : int The total number of vertices. | VertexData | ||
| premultipliedAlpha : Boolean Indicates if the rgb values are stored premultiplied with the alpha value. | VertexData | ||
| rawData : Vector.<Number> [read-only] The raw vertex data; not a copy! | VertexData | ||
| tinted : Boolean [read-only] Indicates if any vertices have a non-white color or are not fully opaque. | VertexData | ||
| Method | Defined By | ||
|---|---|---|---|
VertexData(numVertices:int, premultipliedAlpha:Boolean = false) Create a new VertexData object with a specified number of vertices. | VertexData | ||
append(data:VertexData):void Appends the vertices from another VertexData object. | VertexData | ||
clone(vertexID:int = 0, numVertices:int = -1):VertexData Creates a duplicate of either the complete vertex data object, or of a subset. | VertexData | ||
copyTo(targetData:VertexData, targetVertexID:int = 0, vertexID:int = 0, numVertices:int = -1):void Copies the vertex data (or a range of it, defined by 'vertexID' and 'numVertices')
of this instance to another vertex data object, starting at a certain index. | VertexData | ||
copyTransformedTo(targetData:VertexData, targetVertexID:int = 0, matrix:Matrix = null, vertexID:int = 0, numVertices:int = -1):void Transforms the vertex position of this instance by a certain matrix and copies the
result to another VertexData instance. | VertexData | ||
getAlpha(vertexID:int):Number Returns the alpha value of a vertex in the range 0-1. | VertexData | ||
getBounds(transformationMatrix:Matrix = null, vertexID:int = 0, numVertices:int = -1, resultRect:Rectangle = null):Rectangle Calculates the bounds of the vertices, which are optionally transformed by a matrix. | VertexData | ||
getColor(vertexID:int):uint Returns the RGB color of a vertex (no alpha). | VertexData | ||
getPosition(vertexID:int, position:Point):void Returns the position of a vertex. | VertexData | ||
getTexCoords(vertexID:int, texCoords:Point):void Returns the texture coordinates of a vertex in the range 0-1. | VertexData | ||
scaleAlpha(vertexID:int, factor:Number, numVertices:int = 1):void Multiplies the alpha value of subsequent vertices with a certain factor. | VertexData | ||
setAlpha(vertexID:int, alpha:Number):void Updates the alpha value of a vertex (range 0-1). | VertexData | ||
setColor(vertexID:int, color:uint):void Updates the RGB color values of a vertex (alpha is not changed). | VertexData | ||
setColorAndAlpha(vertexID:int, color:uint, alpha:Number):void Updates the RGB color and alpha value of a vertex in one step. | VertexData | ||
setPosition(vertexID:int, x:Number, y:Number):void Updates the position values of a vertex. | VertexData | ||
setPremultipliedAlpha(value:Boolean, updateData:Boolean = true):void Changes the way alpha and color values are stored. | VertexData | ||
setTexCoords(vertexID:int, u:Number, v:Number):void Updates the texture coordinates of a vertex (range 0-1). | VertexData | ||
setUniformAlpha(alpha:Number):void Sets all vertices of the object to the same alpha values. | VertexData | ||
setUniformColor(color:uint):void Sets all vertices of the object to the same color values. | VertexData | ||
toString():String Creates a string that contains the values of all included vertices. | VertexData | ||
transformVertex(vertexID:int, matrix:Matrix, numVertices:int = 1):void Transforms the position of subsequent vertices by multiplication with a
transformation matrix. | VertexData | ||
translateVertex(vertexID:int, deltaX:Number, deltaY:Number):void Translate the position of a vertex by a certain offset. | VertexData | ||
| Constant | Defined By | ||
|---|---|---|---|
| COLOR_OFFSET : int = 2 [static] The offset of color data (r, g, b, a) within a vertex. | VertexData | ||
| ELEMENTS_PER_VERTEX : int = 8 [static] The total number of elements (Numbers) stored per vertex. | VertexData | ||
| POSITION_OFFSET : int = 0 [static] The offset of position data (x, y) within a vertex. | VertexData | ||
| TEXCOORD_OFFSET : int = 6 [static] The offset of texture coordinates (u, v) within a vertex. | VertexData | ||
| numVertices | property |
numVertices:intThe total number of vertices.
public function get numVertices():int public function set numVertices(value:int):void| premultipliedAlpha | property |
premultipliedAlpha:BooleanIndicates if the rgb values are stored premultiplied with the alpha value. If you change this value, the color data is updated accordingly. If you don't want that, use the 'setPremultipliedAlpha' method instead.
public function get premultipliedAlpha():Boolean public function set premultipliedAlpha(value:Boolean):void| rawData | property |
rawData:Vector.<Number> [read-only] The raw vertex data; not a copy!
public function get rawData():Vector.<Number>| tinted | property |
tinted:Boolean [read-only] Indicates if any vertices have a non-white color or are not fully opaque.
public function get tinted():Boolean| VertexData | () | Constructor |
public function VertexData(numVertices:int, premultipliedAlpha:Boolean = false)Create a new VertexData object with a specified number of vertices.
ParametersnumVertices:int | |
premultipliedAlpha:Boolean (default = false) |
| append | () | method |
public function append(data:VertexData):voidAppends the vertices from another VertexData object.
Parameters
data:VertexData |
| clone | () | method |
public function clone(vertexID:int = 0, numVertices:int = -1):VertexDataCreates a duplicate of either the complete vertex data object, or of a subset. To clone all vertices, set 'numVertices' to '-1'.
Parameters
vertexID:int (default = 0) | |
numVertices:int (default = -1) |
VertexData |
| copyTo | () | method |
public function copyTo(targetData:VertexData, targetVertexID:int = 0, vertexID:int = 0, numVertices:int = -1):voidCopies the vertex data (or a range of it, defined by 'vertexID' and 'numVertices') of this instance to another vertex data object, starting at a certain index.
Parameters
targetData:VertexData | |
targetVertexID:int (default = 0) | |
vertexID:int (default = 0) | |
numVertices:int (default = -1) |
| copyTransformedTo | () | method |
public function copyTransformedTo(targetData:VertexData, targetVertexID:int = 0, matrix:Matrix = null, vertexID:int = 0, numVertices:int = -1):voidTransforms the vertex position of this instance by a certain matrix and copies the result to another VertexData instance. Limit the operation to a range of vertices via the 'vertexID' and 'numVertices' parameters.
Parameters
targetData:VertexData | |
targetVertexID:int (default = 0) | |
matrix:Matrix (default = null) | |
vertexID:int (default = 0) | |
numVertices:int (default = -1) |
| getAlpha | () | method |
public function getAlpha(vertexID:int):NumberReturns the alpha value of a vertex in the range 0-1.
Parameters
vertexID:int |
Number |
| getBounds | () | method |
public function getBounds(transformationMatrix:Matrix = null, vertexID:int = 0, numVertices:int = -1, resultRect:Rectangle = null):RectangleCalculates the bounds of the vertices, which are optionally transformed by a matrix. If you pass a 'resultRect', the result will be stored in this rectangle instead of creating a new object. To use all vertices for the calculation, set 'numVertices' to '-1'.
Parameters
transformationMatrix:Matrix (default = null) | |
vertexID:int (default = 0) | |
numVertices:int (default = -1) | |
resultRect:Rectangle (default = null) |
Rectangle |
| getColor | () | method |
public function getColor(vertexID:int):uintReturns the RGB color of a vertex (no alpha).
Parameters
vertexID:int |
uint |
| getPosition | () | method |
public function getPosition(vertexID:int, position:Point):voidReturns the position of a vertex.
Parameters
vertexID:int | |
position:Point |
| getTexCoords | () | method |
public function getTexCoords(vertexID:int, texCoords:Point):voidReturns the texture coordinates of a vertex in the range 0-1.
Parameters
vertexID:int | |
texCoords:Point |
| scaleAlpha | () | method |
public function scaleAlpha(vertexID:int, factor:Number, numVertices:int = 1):voidMultiplies the alpha value of subsequent vertices with a certain factor.
Parameters
vertexID:int | |
factor:Number | |
numVertices:int (default = 1) |
| setAlpha | () | method |
public function setAlpha(vertexID:int, alpha:Number):voidUpdates the alpha value of a vertex (range 0-1).
Parameters
vertexID:int | |
alpha:Number |
| setColor | () | method |
public function setColor(vertexID:int, color:uint):voidUpdates the RGB color values of a vertex (alpha is not changed).
Parameters
vertexID:int | |
color:uint |
| setColorAndAlpha | () | method |
public function setColorAndAlpha(vertexID:int, color:uint, alpha:Number):voidUpdates the RGB color and alpha value of a vertex in one step.
Parameters
vertexID:int | |
color:uint | |
alpha:Number |
| setPosition | () | method |
public function setPosition(vertexID:int, x:Number, y:Number):voidUpdates the position values of a vertex.
Parameters
vertexID:int | |
x:Number | |
y:Number |
| setPremultipliedAlpha | () | method |
public function setPremultipliedAlpha(value:Boolean, updateData:Boolean = true):voidChanges the way alpha and color values are stored. Optionally updates all exisiting vertices.
Parameters
value:Boolean | |
updateData:Boolean (default = true) |
| setTexCoords | () | method |
public function setTexCoords(vertexID:int, u:Number, v:Number):voidUpdates the texture coordinates of a vertex (range 0-1).
Parameters
vertexID:int | |
u:Number | |
v:Number |
| setUniformAlpha | () | method |
public function setUniformAlpha(alpha:Number):voidSets all vertices of the object to the same alpha values.
Parameters
alpha:Number |
| setUniformColor | () | method |
public function setUniformColor(color:uint):voidSets all vertices of the object to the same color values.
Parameters
color:uint |
| toString | () | method |
public function toString():StringCreates a string that contains the values of all included vertices.
ReturnsString |
| transformVertex | () | method |
public function transformVertex(vertexID:int, matrix:Matrix, numVertices:int = 1):voidTransforms the position of subsequent vertices by multiplication with a transformation matrix.
Parameters
vertexID:int | |
matrix:Matrix | |
numVertices:int (default = 1) |
| translateVertex | () | method |
public function translateVertex(vertexID:int, deltaX:Number, deltaY:Number):voidTranslate the position of a vertex by a certain offset.
Parameters
vertexID:int | |
deltaX:Number | |
deltaY:Number |
| COLOR_OFFSET | Constant |
public static const COLOR_OFFSET:int = 2The offset of color data (r, g, b, a) within a vertex.
| ELEMENTS_PER_VERTEX | Constant |
public static const ELEMENTS_PER_VERTEX:int = 8The total number of elements (Numbers) stored per vertex.
| POSITION_OFFSET | Constant |
public static const POSITION_OFFSET:int = 0The offset of position data (x, y) within a vertex.
| TEXCOORD_OFFSET | Constant |
public static const TEXCOORD_OFFSET:int = 6The offset of texture coordinates (u, v) within a vertex.