Coordinate System?

I wanted to see if i could get some ideas on what would be the best way to create a floating coordinate system using two JSliders and a Canvas. Ive been having trouble figuring out how to sync up the JSliders and the drawing of the lines on the Canvas.

? I am a big confused here ? Doesn't the JSlider have an event? Can't you just use it?



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Hey, this is exaclty what I'm doing. I did something with an interest rate:

int value = interestRateSlider.getValue();
int rate = (double)(1+(.01*value));


First of all, I made my slider go from like 0 to 500 so that I would have plenty of room for decimals and stuff like that.
I got the value from the slider, then created a double out of it with 2 decimal places, and that was it. After that, mortgages were calculated and points were added to arraylists and then it was off to the canvas class to repaint.

Quote:

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Posted by NoteMe

? I am a big confused here ? Doesn't the JSlider have an event? Can't you just use it?

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What i want to do is have a JSlider at the south portion of a JFrame and a JSlider to the east each with a line comming out spanning across a Canvas. So the lines are always going to be intersecting.

I guess what i need is two classes that extend JSlider and implement a ChangeListener interface and ask for a repaint when a ChangeEvent is fired off. The problem is that JSlider has a getValue() method and to draw a line i need to use g.drawLine(int x1, int y1, int x2, int y2). Also if the drawLine() method is shared by both JSlider classes how does the paint method within my class that extends canvas know which JSlider is being slid?

You need to have variables or flags in the other class. I did the same thing except I drew intersecting lines with the mouse motion listener.

public void changeHappend(ChangeEvent ce)
{
int x = ce.getValue();
CanvasName.x = x;
CanvasName.repaint();
}


in canvas class:


if (x != 0 && y != 0)
{
g.drawLine(0,y,100,y);
g.drawLine(x,0,x,100);
}

Thanks for the help System_Error. I will give that a try. :thumb:

Ever figure something out?

I stared to make some changes then got sidetracked. :(