goog.graphics.AffineTransform
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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).
new AffineTransform( opt_m00, opt_m10, opt_m01, opt_m11, opt_m02, opt_m12 )
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Instance Methods
this.clone() → goog.graphics.AffineTransform
goog.graphics.AffineTransform| Parameters | None. | ||
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this.concatenate( tx ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformConcatenates an affine transform to this transform.
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this.copyFrom( tx ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformSets this transform to be identical to the given transform.
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this.createInverse() → goog.graphics.AffineTransform
goog.graphics.AffineTransform| Parameters | None. | ||
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this.equals( tx ) → boolean
booleanCompares two affine transforms for equality.
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this.getDeterminant() → number
number| Parameters | None. | ||
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this.getScaleX() → number
number| Parameters | None. | ||
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this.getScaleY() → number
number| Parameters | None. | ||
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this.getShearX() → number
number| Parameters | None. | ||
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this.getShearY() → number
number| Parameters | None. | ||
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this.getTranslateX() → number
number| Parameters | None. | ||
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this.getTranslateY() → number
number| Parameters | None. | ||
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this.isIdentity() → boolean
boolean| Parameters | None. | ||
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this.isInvertible() → boolean
booleanReturns whether the transform is invertible. A transform is not invertible if the determinant is 0 or any value is non-finite or NaN.
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this.preConcatenate( tx ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformPre-concatenates an affine transform to this transform.
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this.preRotate( theta, x, y ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformPre-concatenates this transform with a rotation transformation around an anchor point.
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this.preScale( sx, sy ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformPre-concatenates this transform with a scaling transformation, i.e. calculates the following matrix product:
[sx 0 0] [m00 m01 m02] [ 0 sy 0] [m10 m11 m12] [ 0 0 1] [ 0 0 1]
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this.preShear( shx, shy ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformPre-concatenates this transform with a shear transformation. i.e. calculates the following matrix product:
[ 1 shx 0] [m00 m01 m02] [shy 1 0] [m10 m11 m12] [ 0 0 1] [ 0 0 1]
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this.preTranslate( dx, dy ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformPre-concatenates this transform with a translate transformation, i.e. calculates the following matrix product:
[1 0 dx] [m00 m01 m02] [0 1 dy] [m10 m11 m12] [0 0 1] [ 0 0 1]
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this.rotate( theta, x, y ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformConcatenates this transform with a rotation transformation around an anchor point.
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this.scale( sx, sy ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformConcatenates this transform with a scaling transformation.
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this.setToRotation( theta, x, y ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformSets this transform to a rotation transformation.
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this.setToScale( sx, sy ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformSets this transform to a scaling transformation.
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this.setToShear( shx, shy ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformSets this transform to a shearing transformation.
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this.setToTranslation( dx, dy ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformSets this transform to a translation transformation.
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this.setTransform( m00, m10, m01, m11, m02, m12 ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformSets this transform to the matrix specified by the 6 values.
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this.shear( shx, shy ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformConcatenates this transform with a shear transformation.
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this.toString() → string
string| Parameters | None. | ||
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this.transform( src, srcOff, dst, dstOff, numPts ) → void
voidTransforms an array of coordinates by this transform and stores the result into a destination array.
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this.translate( dx, dy ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformConcatenates this transform with a translate transformation.
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Instance Properties
this.m00_ → number
numberNo information.
this.m01_ → number
numberNo information.
this.m02_ → number
numberNo information.
this.m10_ → number
numberNo information.
this.m11_ → number
numberNo information.
this.m12_ → number
numberNo information.
Static Functions
AffineTransform.getRotateInstance( theta, x, y ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformCreates a transform representing a rotation transformation.
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AffineTransform.getScaleInstance( sx, sy ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformCreates a transform representing a scaling transformation.
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AffineTransform.getShearInstance( shx, shy ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformCreates a transform representing a shearing transformation.
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AffineTransform.getTranslateInstance( dx, dy ) → goog.graphics.AffineTransform
goog.graphics.AffineTransformCreates a transform representing a translation transformation.
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