Why won't this image rotate a code example

[Chrissirhc]

public void rotateImage(double theta)
{
System.out.println("********1*******"
imageGraphics.rotate(theta*RADCONVERTOR); //This should be in radians.
System.out.println("********2*******"
myWritableRaster = (WritableRaster)imageInfo.getData();
System.out.println("********3*******"
int transferType = myWritableRaster.getTransferType();
int numOfElements = myWritableRaster.getNumDataElements();
System.out.println("********4*******"
height = imageInfo.getHeight();
width = imageInfo.getWidth();
System.out.println("********5*******"
imageArray = new byte[width*height*numOfElements];
System.out.println("********6*******"
myWritableRaster.getDataElements(0,0, width, height, imageArray);
System.out.println("********7*******"
changeArrayToTwo();
System.out.println("********8*******"
threshold();
}

A buffered image has been drawn onto the imageGraphics object previously.

It compiles it runs but it doesn't rotate the image.

Thanks if anyone reads or if anyone can help

Chris

 

[davidrv]

you should notice that many objects methods
does not alter the state of the object...
for example look at this example with the BigDecimal

BigDecimal num1 = new BigDecimal( 1.0 );
System.out.println( num1 ); // the output is 1.0
num1.add( new BigDecimal( 1.0 ) );
System.out.println( num1 ); // the output is 1.0 again
                       // and we expected 2.0

The reason is that the add method what really does is
to return a BigDecimal value that is the result of adding
the paremeter to the object, but does not alter the object!!
The right code would be...

BigDecimal num1 = new BigDecimal( 1.0 );
System.out.println( num1 ); // the output is 1.0
num1 = num1.add( new BigDecimal( 1.0 ) );
System.out.println( num1 ); // the output is 2.0 
                       // as we expected

 

[Chrissirhc]

The rotate method is void so it doesn' return anything.

Chris