Adobe 0046100128056 - InDesign - Mac - Page 64

CHAPTER 5: Working with Page Items Transforming Page Items 64
//The following statements are equivalent. slope = rise/run--so
//the slope of 45 degrees is 1.
myTransformationMatrix = myTransformationMatrix.shearMatrix(45);
myTransformationMatrix = myTransformationMatrix.shearMatrix(undefined, 1);
You can get the inverse of a transformation matrix using the invertMatrixmethod, as shown in the
following example. (For the complete script, see InvertMatrix.) You can use the inverted transformation
matrix to undo the effect of the matrix.
var myRectangle = app.documents.item(0).pages.item(0).rectangles.item(0);
var myTransformationMatrix =
app.transformationMatrices.add({counterclockwiseRotationAngle:30,
horizontalTranslation:12, verticalTranslation:12});
myRectangle.transform(CoordinateSpaces.pasteboardCoordinates,
AnchorPoint.centerAnchor, myTransformationMatrix);
var myNewRectangle = myRectangle.duplicate();
//Move the duplicated rectangle to the location of the original
//rectangle by inverting, then applying the transformation matrix.
myTransformationMatrix = myTransformationMatrix.invertMatrix();
myRectangle.transform(CoordinateSpaces.pasteboardCoordinates,
AnchorPoint.centerAnchor, myTransformationMatrix);
You can add transformation matrices using the catenateMatrixmethod, as shown in the following
example. (For the complete script, see CatenateMatrix.)
var myTransformationMatrixA =
app.transformationMatrices.add({counterclockwiseRotationAngle:30});
var myTransformationMatrixB =
app.transformationMatrices.add({horizontalTranslation:12, verticalTranslation:12});
var myRectangle = app.documents.item(0).pages.item(0).rectangles.item(-1);
var myNewRectangle = myRectangle.duplicate();
//Rotate the duplicated rectangle.
myNewRectangle.transform(CoordinateSpaces.pasteboardCoordinates,
AnchorPoint.centerAnchor, myTransformationMatrixA);
myNewRectangle = myRectangle.duplicate();
//Move the duplicate (unrotated) rectangle.
myNewRectangle.transform(CoordinateSpaces.pasteboardCoordinates,
AnchorPoint.centerAnchor, myTransformationMatrixB);
//Merge the two transformation matrices.
myTransformationMatrix =
myTransformationMatrixA.catenateMatrix(myTransformationMatrixB);
myNewRectangle = myRectangle.duplicate();
//The duplicated rectangle will be both moved and rotated.
myNewRectangle.transform(CoordinateSpaces.pasteboardCoordinates,
AnchorPoint.centerAnchor, myTransformationMatrix);
When an object is transformed, you can get the transformation matrix that was applied to it, using the
transformValuesOf method, as shown in the following script fragment. (For the complete script, see
TransformValuesOf.)