Vector loosing values of object?
Hello, hope someone can help me out a bit on this issue that i'm encountering
in the following code am reading pixel values from a raster (image) and storing the relevant ones in a Vector, however am encountering a problem in the last "if statement" as the vector is not storing the right values that are printed on screen but rather storing the values set by: currentPixel.setBlank();
i cannot determine the reason for this behaviour since the "currentPixel" object is stored before the currentPixel.setBlank() method. Also what is puzzling me more is that the values in the println command are being displayed correctly! however when i dump all the values of the vector on screen the values are those assigned by currentPixel.setBlank() method;
for (int h=0;h<height;h++){
for (int w=0;w<width;w++){
position = (h*width)+w;
previousPixel = new PixelHolder();
previousPixel = currentPixel;
currentPixel = new PixelHolder();
currentPixel.setValue(pixelStore[position]);
currentPixel.setX(w);
currentPixel.setY(h);
previous = previousPixel.value;
current = currentPixel.value;
if (previous > current){
System.out.println(" pixel:"+ previousPixel.positionX+","+previousPixel.positionY+","+ previousPixel.value );
//store previousPixel;
myPixelVector.addElement(previousPixel);
} else if (current > previous){
bufferPixel = new PixelHolder();
bufferPixel = previousPixel;
buffer = bufferPixel.value;
if ((w == width-1) && (current > buffer)){
//store currentPixel;
System.out.println("3rd phase currentpixel:"+ currentPixel.positionX+","+currentPixel.positionY+","+ currentPixel.value );
myPixelVector.add(currentPixel); //problems here..
bufferPixel.setBlank();
currentPixel.setBlank();
setBlank method from PixelHolder();:
public void setBlank(){
positionX = 0;
positionY = 0;
value = 0;
}output by : System.out.println("3rd phase currentpixel:"+ currentPixel.positionX+","+currentPixel.positionY+","+ currentPixel.value );:
previous pixel:178,63,106
3rd phase currentpixel:179,63,105
output by displaying contents of myPixelVector on screen (note the last three values tally in the first line, whereas in second line these are as per the setBlank method):
i: 3289,178,63,106
i: 3290,0,0,0
hope any one can brighten my thoughts up as i am really lost with this one!
thanks a lot!
S
the problem is that when you are adding currentPixel to the Vector, you are adding the instance being pointed to by currentPixel, which retains the pointer. Thus when you setBlank currentPixel, you are blanking the instance which is also being referenced in the Vector.
A way around it is to add a clone of the pixel to the Vector - make sure the clone method is implemented in that class.
E.g. myPixelVector.add(currentPixel.clone());
Hope this Helps!
Jon
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