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//--------------------------------- REVISIONS ------------------------------
// Date Name Tracking # Description
// --------- ------------------- ------------- ----------------------
// 13JUN2009 James Shen Initial Creation
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/**
* Returns a transform that rotates coordinates around an anchor
* point accordinate to a rotation vector.
* All coordinates rotate about the specified anchor coordinates
* by the same amount.
* The amount of rotation is such that coordinates along the former
* positive X axis will subsequently align with the vector pointing
* from the origin to the specified vector coordinates.
* If both <code>vecx</code> and <code>vecy</code> are 0.0,
* an identity transform is returned.
* This operation is equivalent to calling:
* <pre>
* AffineTransform.getRotateInstance(Math.Atan2(vecy, vecx),
* anchorx, anchory);
* </pre>
*
* @param vecx the X coordinate of the rotation vector
* @param vecy the Y coordinate of the rotation vector
* @param anchorx the X coordinate of the rotation anchor point
* @param anchory the Y coordinate of the rotation anchor point
* @return an <code>AffineTransform</code> object that rotates
* coordinates around the specified point according to the
* specified rotation vector.
*/
public static AffineTransform GetRotateInstance(double vecx,
double vecy,
double anchorx,
double anchory)
{
var tx = new AffineTransform();
tx.SetToRotation(vecx, vecy, anchorx, anchory);
return tx;
}
////////////////////////////////////////////////////////////////////////////
//--------------------------------- REVISIONS ------------------------------
// Date Name Tracking # Description
// --------- ------------------- ------------- ----------------------
// 13JUN2009 James Shen Initial Creation
////////////////////////////////////////////////////////////////////////////
/**
* Returns a transform representing a rotation transformation.
* The matrix representing the returned transform is:
* <pre>
* [ Cos(theta) -Sin(theta) 0 ]
* [ Sin(theta) Cos(theta) 0 ]
* [ 0 0 1 ]
* </pre>
* Rotating by a positive angle theta rotates points on the positive
* X axis toward the positive Y axis.
* also the discussion of
* <a href="#quadrantapproximation">Handling 90-Degree Rotations</a>
* above.
* @param theta the angle of rotation measured in radians
* @return an <code>AffineTransform</code> object that is a rotation
* transformation, created with the specified angle of rotation.
*/
public static AffineTransform GetRotateInstance(double theta)
{
var tx = new AffineTransform();
tx.SetToRotation(theta);
return tx;
}
