Algorithm on GeneralPath in Graphics2D

Question

Hie!~Good Day
I am facing this problem for some time but still cannot solve it. I got all the syntax correct (well at least no error during compiling) but still nothing change.
The part that perform this consists of 2 class file, Zoom and Data. In Zoom, it loads the image and display it when the program starts. Data is started when a file is loaded into the program. The file contains the coordinates,which is used to draw lines connecting all the coordinates.
What I did: in Data, I get all the values into 2 public array(xcoor,ycoor). If the xcoor or ycoor is not null, I run the zoom again, like this:
if(xcoor!=null||ycoor!=null)
new Zoom();
in Zoom, actually it already ran once when loaded, so the image is already displayed. I create 2 new arrays (xcoor1,ycoor2) to copy all the value from xcoor and ycoor(just to play safe). then I start draw it. like this:
GeneralPath polygon = new GeneralPath(GeneralPath.WIND_EVEN_ODD,x1Points.length);
polygon.moveTo(xcoor1[0], ycoor1[0]);
for ( int i = 1; i < xcoor1.length; i++ ) {
polygon.lineTo(xcoor1, ycoor1[i]);
context.draw(polygon);
context is Graphics2D. The compilation into class file is ok. But the GeneralPath is not drawn into the context. What is wrong with this?
P.S. I don't want the topic to be so long so I didn't paste the whole code.

Answer 1

Here is what I did:
if((x == null) || (y == null))
return;
int num = x.length;
path = new GeneralPath(GeneralPath.WIND_EVEN_ODD);
path.moveTo(x[0], y[0]);
for(int i=1; i<num;i++)
path.lineTo(x, y[i]);
g.draw(path);
This code is within a function and after the function call, I call repaint and then my graphic is displayed. It looks to me that the piece of code you showed is ok. Therefore the problem may come from somewhere else. I suggest you check the coordinate array to make sure it contains valid value( at least not all zeros ). Also double check you paintComponent.