Examples of java.awt.geom.AffineTransform.inverseTransform()

java.awt.geom.AffineTransform.inverseTransform()
Inverse transforms the specified ptSrc and stores the result in ptDst. If ptDst is null, a new Point2D object is allocated and then the result of the transform is stored in this object. In either case, ptDst, which contains the transformed point, is returned for convenience. If ptSrc and ptDst are the same object, the input point is correctly overwritten with the transformed point. @param ptSrc the point to be inverse transformed @param ptDst the resulting transformed point @return ptDst, which contains the result of the inverse transform. @exception NoninvertibleTransformException if the matrix cannot beinverted. @since 1.2

                private void updateDropper(MouseEvent e) {
                    Point p = e.getPoint();
                    Point q = new Point();
                    AffineTransform xform = modes.getOverlayTransform();
                    try {
                        xform.inverseTransform(p, q);
                        opControls.setDropper(q);
                    }
                    catch (NoninvertibleTransformException f) {
                        // Can't happen, because Engine transforms are never
                        // singular.

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        af.translate(rect.getAnchorX(), rect.getAnchorY());
        af.rotate(Math.toRadians(rect.getRotate()));
        af.scale(rect.getScaleX(), rect.getScaleY());
        af.translate(-rect.getAnchorX(), -rect.getAnchorY());
        try {
            return af.inverseTransform(new Point2D.Double(x, y), null);
        } catch (NoninvertibleTransformException e) {
            e.printStackTrace();
            return new Point2D.Double(x,y);
        }
    }

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                af.translate(node.getTranslateX(),node.getTranslateY());
                af.translate(node.getAnchorX(),node.getAnchorY());
                af.rotate(Math.toRadians(node.getRotate()));
                af.scale(node.getScaleX(), node.getScaleY());
                af.translate(-node.getAnchorX(), -node.getAnchorY());
                Point2D pt2 = af.inverseTransform(pt, null);
                return new Point2D.Double(pt2.getX(),pt2.getY());
            } catch (NoninvertibleTransformException e) {
                e.printStackTrace();
            }
        }

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      ReferencedEnvelope extent, Dimension displaySize) {
    // set up the affine transform and calculate scale values
    AffineTransform at = worldToScreenTransform(extent, displaySize);


    try {
      Point2D result = at.inverseTransform(
          new java.awt.geom.Point2D.Double(x, y),
          new java.awt.geom.Point2D.Double());
      Coordinate c = new Coordinate(result.getX(), result.getY());


      return c;

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        int y=52+90;
        
        map.addPoint(x,y, map.getGeoms().get(0).getShell());
        double [] tmp=new double[]{ x+.5,y+.5 };
        double [] expected=new double[2];
        translateInstance.inverseTransform(tmp, 0,tmp,0,1);
        t.inverse().transform(tmp, 0, expected,0,1);
        assertEquals(new Coordinate(expected[0], expected[1]),map.getCoords(x,y).get(0));
    }
    
    @Test

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    AffineTransform t1 = AffineTransform.getScaleInstance(0.5, 0.25);
    double[] v = new double[] { 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0 };
    double[] expected = new double[] { 1.0, 2.0, 6.0, 16.0, 10.0, 24.0, 14.0, 32.0, 9.0, 10.0 };
    try 
    {
      t1.inverseTransform(v, 2, v, 2, 3);
      for (int i = 0; i < 10; i++) {
        harness.check(v[i], expected[i]);
      }
    }
    catch (NoninvertibleTransformException e)

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    }
  
    Point2D p1 = new Point2D.Double(1.0, 2.0);
    try 
    {
      Point2D p2 = t1.inverseTransform(p1, null);
      harness.check(p2.getX(), 2.0);
      harness.check(p2.getY(), 8.0);
      t1.inverseTransform(p1, p1);
      harness.check(p1.getX(), 2.0);
      harness.check(p1.getY(), 8.0);

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    try 
    {
      Point2D p2 = t1.inverseTransform(p1, null);
      harness.check(p2.getX(), 2.0);
      harness.check(p2.getY(), 8.0);
      t1.inverseTransform(p1, p1);
      harness.check(p1.getX(), 2.0);
      harness.check(p1.getY(), 8.0);
    }
    catch (NoninvertibleTransformException e)
    {

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    }
  
    boolean pass = false;
    try
    {
      t1.inverseTransform(null, null);
    }
    catch (NoninvertibleTransformException e1)
    {
      pass = false;
    }

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    Point2D.Double mousePositionUC = new Point2D.Double();
    
    // create transform to undo the translation.
    try {
      // manually untransform points as above with reverse.transform( before, after ),      
      transformer.inverseTransform( me.getPoint(), mousePositionUC );
    } catch (NoninvertibleTransformException e) {
      e.printStackTrace();
    }
    
    return mousePositionUC;

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