graphics.AffineTransform Extends Object
Creates a 2D affine transform. An affine transform performs a linear mapping from 2D coordinates to other 2D coordinates that preserves the "straightness" and "parallelness" of lines. Such a coordinate transformation can be represented by a 3 row by 3 column matrix with an implied last row of [ 0 0 1 ]. This matrix transforms source coordinates (x,y) into destination coordinates (x',y') by considering them to be a column vector and multiplying the coordinate vector by the matrix according to the following process: 
[ x']   [  m00  m01  m02  ] [ x ]   [ m00x + m01y + m02 ]
[ y'] = [  m10  m11  m12  ] [ y ] = [ m10x + m11y + m12 ]
[ 1 ]   [   0    0    1   ] [ 1 ]   [         1         ]
This class is optimized for speed and minimizes calculations based on its knowledge of the underlying matrix (as opposed to say simply performing matrix multiplication).

Inheritance

Object
     goog.graphics.AffineTransform

Constructor

goog.graphics.AffineTransform(opt_m00, opt_m10, opt_m01, opt_m11, opt_m02, opt_m12)

Parameters

opt_m00 :
number
The m00 coordinate of the transform.
opt_m10 :
number
The m10 coordinate of the transform.
opt_m01 :
number
The m01 coordinate of the transform.
opt_m11 :
number
The m11 coordinate of the transform.
opt_m02 :
number
The m02 coordinate of the transform.
opt_m12 :
number
The m12 coordinate of the transform.

Instance Methods

Public Protected Private
Defined in goog.graphics.AffineTransform
clone() ⇒
!goog.graphics.AffineTransform
No description.
Returns: 
!goog.graphics.AffineTransform
  A copy of this transform.
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concatenate(tx) ⇒
!goog.graphics.AffineTransform
Concatenates an affine transform to this transform.
Arguments:
tx :
!goog.graphics.AffineTransform
The transform to concatenate.
Returns: 
!goog.graphics.AffineTransform
  This affine transform.
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copyFrom(tx) ⇒
!goog.graphics.AffineTransform
Sets this transform to be identical to the given transform.
Arguments:
tx :
!goog.graphics.AffineTransform
The transform to copy.
Returns: 
!goog.graphics.AffineTransform
  This affine transform.
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createInverse() ⇒
!goog.graphics.AffineTransform
No description.
Returns: 
!goog.graphics.AffineTransform
  An AffineTransform object representing the inverse transformation.
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getDeterminant() ⇒
number
No description.
Returns: 
number
  The determinant of this transform.
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getScaleX() ⇒
number
No description.
Returns: 
number
  The scaling factor in the x-direction (m00).
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getScaleY() ⇒
number
No description.
Returns: 
number
  The scaling factor in the y-direction (m11).
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getShearX() ⇒
number
No description.
Returns: 
number
  The shear factor in the x-direction (m01).
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getShearY() ⇒
number
No description.
Returns: 
number
  The shear factor in the y-direction (m10).
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getTranslateX() ⇒
number
No description.
Returns: 
number
  The translation in the x-direction (m02).
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getTranslateY() ⇒
number
No description.
Returns: 
number
  The translation in the y-direction (m12).
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isIdentity() ⇒
boolean
No description.
Returns: 
boolean
  Whether this transform is the identity transform.
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isInvertible() ⇒
boolean
Returns whether the transform is invertible. A transform is not invertible if the determinant is 0 or any value is non-finite or NaN.
Returns: 
boolean
  Whether the transform is invertible.
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preConcatenate(tx) ⇒
!goog.graphics.AffineTransform
Pre-concatenates an affine transform to this transform.
Arguments:
tx :
!goog.graphics.AffineTransform
The transform to preconcatenate.
Returns: 
!goog.graphics.AffineTransform
  This affine transform.
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rotate(theta, x, y) ⇒
!goog.graphics.AffineTransform
Concatentates this transform with a rotation transformation around an anchor point.
Arguments:
theta :
number
The angle of rotation measured in radians.
x :
number
The x coordinate of the anchor point.
y :
number
The y coordinate of the anchor point.
Returns: 
!goog.graphics.AffineTransform
  This affine transform.
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scale(sx, sy) ⇒
!goog.graphics.AffineTransform
Concatentates this transform with a scaling transformation.
Arguments:
sx :
number
The x-axis scaling factor.
sy :
number
The y-axis scaling factor.
Returns: 
!goog.graphics.AffineTransform
  This affine transform.
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setToRotation(theta, x, y) ⇒
!goog.graphics.AffineTransform
Sets this transform to a rotation transformation.
Arguments:
theta :
number
The angle of rotation measured in radians.
x :
number
The x coordinate of the anchor point.
y :
number
The y coordinate of the anchor point.
Returns: 
!goog.graphics.AffineTransform
  This affine transform.
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setToScale(sx, sy) ⇒
!goog.graphics.AffineTransform
Sets this transform to a scaling transformation.
Arguments:
sx :
number
The x-axis scaling factor.
sy :
number
The y-axis scaling factor.
Returns: 
!goog.graphics.AffineTransform
  This affine transform.
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setToShear(shx, shy) ⇒
!goog.graphics.AffineTransform
Sets this transform to a shearing transformation.
Arguments:
shx :
number
The x-axis shear factor.
shy :
number
The y-axis shear factor.
Returns: 
!goog.graphics.AffineTransform
  This affine transform.
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setToTranslation(dx, dy) ⇒
!goog.graphics.AffineTransform
Sets this transform to a translation transformation.
Arguments:
dx :
number
The distance to translate in the x direction.
dy :
number
The distance to translate in the y direction.
Returns: 
!goog.graphics.AffineTransform
  This affine transform.
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setTransform(m00, m10, m01, m11, m02, m12) ⇒
!goog.graphics.AffineTransform
Sets this transform to the matrix specified by the 6 values.
Arguments:
m00 :
number
The m00 coordinate of the transform.
m10 :
number
The m10 coordinate of the transform.
m01 :
number
The m01 coordinate of the transform.
m11 :
number
The m11 coordinate of the transform.
m02 :
number
The m02 coordinate of the transform.
m12 :
number
The m12 coordinate of the transform.
Returns: 
!goog.graphics.AffineTransform
  This affine transform.
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shear(shx, shy) ⇒
!goog.graphics.AffineTransform
Concatentates this transform with a shear transformation.
Arguments:
shx :
number
The x shear factor.
shy :
number
The y shear factor.
Returns: 
!goog.graphics.AffineTransform
  This affine transform.
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toString() ⇒
string
No description.
Returns: 
string
  A string representation of this transform. The format of of the string is compatible with SVG matrix notation, i.e. "matrix(a,b,c,d,e,f)".
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transform(src, srcOff, dst, dstOff, numPts)
Transforms an array of coordinates by this transform and stores the result into a destination array.
Arguments:
src :
!Array.<number>
The array containing the source points as x, y value pairs.
srcOff :
number
The offset to the first point to be transformed.
dst :
!Array.<number>
The array into which to store the transformed point pairs.
dstOff :
number
The offset of the location of the first transformed point in the destination array.
numPts :
number
The number of points to tranform.
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translate(dx, dy) ⇒
!goog.graphics.AffineTransform
Concatentates this transform with a translate transformation.
Arguments:
dx :
number
The distance to translate in the x direction.
dy :
number
The distance to translate in the y direction.
Returns: 
!goog.graphics.AffineTransform
  This affine transform.
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Static Methods

goog.graphics.AffineTransform.getRotateInstance(theta, x, y) ⇒
!goog.graphics.AffineTransform
Creates a transform representing a rotation transformation.
Arguments:
theta :
number
The angle of rotation measured in radians.
x :
number
The x coordinate of the anchor point.
y :
number
The y coordinate of the anchor point.
Returns: 
!goog.graphics.AffineTransform
  A transform representing a rotation transformation.
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goog.graphics.AffineTransform.getScaleInstance(sx, sy) ⇒
!goog.graphics.AffineTransform
Creates a transform representing a scaling transformation.
Arguments:
sx :
number
The x-axis scaling factor.
sy :
number
The y-axis scaling factor.
Returns: 
!goog.graphics.AffineTransform
  A transform representing a scaling transformation.
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goog.graphics.AffineTransform.getShearInstance(shx, shy) ⇒
!goog.graphics.AffineTransform
Creates a transform representing a shearing transformation.
Arguments:
shx :
number
The x-axis shear factor.
shy :
number
The y-axis shear factor.
Returns: 
!goog.graphics.AffineTransform
  A transform representing a shearing transformation.
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goog.graphics.AffineTransform.getTranslateInstance(dx, dy) ⇒
!goog.graphics.AffineTransform
Creates a transform representing a translation transformation.
Arguments:
dx :
number
The distance to translate in the x direction.
dy :
number
The distance to translate in the y direction.
Returns: 
!goog.graphics.AffineTransform
  A transform representing a translation transformation.
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Package graphics

Package Reference