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

java.awt.geom.AffineTransform.deltaTransform()
Transforms the relative distance vector specified by ptSrc and stores the result in ptDst. A relative distance vector is transformed without applying the translation components of the affine transformation matrix using the following equations:
```
 [  x' ]   [  m00  m01 (m02) ] [  x  ]   [ m00x + m01y ] [  y' ] = [  m10  m11 (m12) ] [  y  ] = [ m10x + m11y ] [ (1) ]   [  (0)  (0) ( 1 ) ] [ (1) ]   [     (1)     ] 
```
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 distance vector to be delta transformed @param ptDst the resulting transformed distance vector @return ptDst, which contains the result of thetransformation. @since 1.2

                        at.deltaTransform(new Point2D.Float(x1, y1), null));


                Point2D dst = new Point2D.Double();
                assertEquals(
                        new Point2D.Double(x2, y2),
                        at.deltaTransform(new Point2D.Double(x1, y1), dst));
                assertEquals(
                        new Point2D.Double(x2, y2),
                        dst);
            }
        }

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    public void testDeltaTransform2() {
        AffineTransform at = new AffineTransform(0, 1, -2, 0, 3, 4);
        double[] src = new double[]{0, 0, 0, 0, 0, 0, 1, 1, 0, 0};
        double[] dst = new double[6];
        double[] expected = new double[]{0, 0, 0, 0, -2, 1};
        at.deltaTransform(src, 4, dst, 2, 2);
        assertEquals(expected, dst, 6, 0.0);
    }


    public void testInversTransform1() {
        try {

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             * between user and device space.
             * Take the absolute value in case there is negative
             * scaling in effect.
             */
            deviceTransform = getTransform();
            deviceTransform.deltaTransform(penSize, penSize);
            deviceLineWidth = Math.min(Math.abs(penSize.x),
                                       Math.abs(penSize.y));


            /* If the requested line is too thin then map our
             * minimum line width back to user space and set

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                    /* Convert the minimum line width from device
                     * space to user space.
                     */
                    inverse = deviceTransform.createInverse();
                    inverse.deltaTransform(minPenSize, minPenSize);


                    minLineWidth = Math.max(Math.abs(minPenSize.x),
                                            Math.abs(minPenSize.y));


                    /* Use all of the parameters from the current

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             */
            Font currentFont = getFont();
            float fontSize = currentFont.getSize2D();


            Point2D.Double pty = new Point2D.Double(0.0, 1.0);
            fontTransform.deltaTransform(pty, pty);
            double scaleFactorY = Math.sqrt(pty.x*pty.x+pty.y*pty.y);
            float scaledFontSizeY = (float)(fontSize * scaleFactorY);


            Point2D.Double pt = new Point2D.Double(1.0, 0.0);
            fontTransform.deltaTransform(pt, pt);

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            fontTransform.deltaTransform(pty, pty);
            double scaleFactorY = Math.sqrt(pty.x*pty.x+pty.y*pty.y);
            float scaledFontSizeY = (float)(fontSize * scaleFactorY);


            Point2D.Double pt = new Point2D.Double(1.0, 0.0);
            fontTransform.deltaTransform(pt, pt);
            double scaleFactorX = Math.sqrt(pt.x*pt.x+pt.y*pt.y);
            float scaledFontSizeX = (float)(fontSize * scaleFactorX);


            float awScale =(float)(scaleFactorX/scaleFactorY);
            /* don't let rounding errors be interpreted as non-uniform scale */

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         * represent the amount of scaling GDI will be asked
         * to perform.
         */
        Point2D.Float unitVectorX = new Point2D.Float(1, 0);
        Point2D.Float unitVectorY = new Point2D.Float(0, 1);
        fullTransform.deltaTransform(unitVectorX, unitVectorX);
        fullTransform.deltaTransform(unitVectorY, unitVectorY);


        Point2D.Float origin = new Point2D.Float(0, 0);
        double scaleX = unitVectorX.distance(origin);
        double scaleY = unitVectorY.distance(origin);

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         * to perform.
         */
        Point2D.Float unitVectorX = new Point2D.Float(1, 0);
        Point2D.Float unitVectorY = new Point2D.Float(0, 1);
        fullTransform.deltaTransform(unitVectorX, unitVectorX);
        fullTransform.deltaTransform(unitVectorY, unitVectorY);


        Point2D.Float origin = new Point2D.Float(0, 0);
        double scaleX = unitVectorX.distance(origin);
        double scaleY = unitVectorY.distance(origin);

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                float lineWidth = lineStroke.getLineWidth();
                Point2D.Float penSize = new Point2D.Float(lineWidth,
                                                          lineWidth);


                deviceTransform.deltaTransform(penSize, penSize);
                float deviceLineWidth = Math.min(Math.abs(penSize.x),
                                                 Math.abs(penSize.y));


                /* transform upper left coordinate */
                Point2D.Float ul_pos = new Point2D.Float(x, y);

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         * represent the amount of scaling PS will be asked
         * to perform.
         */
        Point2D.Float unitVectorX = new Point2D.Float(1, 0);
        Point2D.Float unitVectorY = new Point2D.Float(0, 1);
        fullTransform.deltaTransform(unitVectorX, unitVectorX);
        fullTransform.deltaTransform(unitVectorY, unitVectorY);


        Point2D.Float origin = new Point2D.Float(0, 0);
        double scaleX = unitVectorX.distance(origin);
        double scaleY = unitVectorY.distance(origin);

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