[java] JSlider doet vaag;

[intrix]

Java:

import java.applet.Applet;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.lang.StrictMath;
import java.util.*;

public class GradientPaintEx extends JFrame
{
    myCustomCanvas mc;
    JSlider p1slide, p2slide;
    JRadioButton cyclic_rb, acyclic_rb;
    
    public GradientPaintEx()
    {
        super("GradientPaint examples");
        BorderLayout f1 = new BorderLayout();
        Panel uipanel = new Panel();
        
        p1slide = new JSlider();
        p2slide = new JSlider();
        
        cyclic_rb = new JRadioButton();
        acyclic_rb = new JRadioButton();
        
        mc = new myCustomCanvas(this);
        mc.setSize(500,500);
        mc.setPaint(100,200);
        
        SliderListner sl = new SliderListner(this,mc);  // compiler zegt: cannot resolve symbol
        p1slide.addSliderListner(sl);

        uipanel.add(cyclic_rb);
        uipanel.add(acyclic_rb);
        uipanel.add(p1slide);
        uipanel.add(p2slide); 
             
        this.getContentPane().setLayout(f1);
        this.getContentPane().add(mc,BorderLayout.CENTER);
        this.getContentPane().add(uipanel,BorderLayout.NORTH);
        this.setSize(500,500);
        this.show();        
        addWindowListener(new WindowEventHandler());
        
    }
    
    class WindowEventHandler extends WindowAdapter
    {
        public void windowClosing(WindowEvent e)
        {
            System.exit(0);
        }
    }
    
    public static void main(String[] args)
    {
        new GradientPaintEx();
    }
}// end 

class SliderListner implements ChangeListener
{
    GradientPaintEx gex;
    myCustomCanvas mc;
    int slider_val;
    
    public void SliderListner(GradientPaintEx gex, myCustomCanvas mc)
    {
        this.gex = gex;
        this.mc = mc;
    }
    
    public void stateChanged(ChangeEvent e)
    {
        int p1pos = gex.p1slide.getValue();
        int p2pos = gex.p2slide.getValue();
        
        mc.setPaint(p1pos,p2pos);
    }
}// end

class myCustomCanvas extends Canvas
{
    GradientPaintEx gex;
    double p1pos, p2pos;
    GradientPaint gpaint;
    
    public myCustomCanvas(GradientPaintEx gex)
    {
        this.gex = gex;
    }
    
    public void setPaint(int p1pos, int p2pos)
    {
        this.p1pos = (double) p1pos;
        this.p2pos = (double) p2pos;
        
        boolean cycle = true;
        if (gex.cyclic_rb.isSelected())
            cycle = true;
        else
            cycle = false;
            
        Point2D x = new Point2D.Double(p1pos,this.getSize().height/2);
        Point2D y = new Point2D.Double(p2pos,this.getSize().height/2);
        gpaint = new GradientPaint(x, Color.red, y, Color.green, cycle);
        
        repaint();        
    }
    
    public void update(Graphics g)
    {
        paint(g);
    }
    
    public void paint(Graphics g)
    {
        gex.p1slide.setMaximum(this.getSize().width);
        gex.p2slide.setMaximum(this.getSize().width);
        
        Graphics2D g2d = (Graphics2D) g;
        
        g2d.setPaint(gpaint);
        
        g2d.fill(new Rectangle2D.Double(0, 0, this.getSize().width, this.getSize().height));
        
        g2d.setColor(Color.black);
        BasicStroke stroke = new BasicStroke(4);
        g2d.setStroke(stroke);      

        Line2D line1 = new Line2D.Double(p1pos,0,p1pos,this.getSize().height);   
        g2d.draw(line1);
        Line2D line2 = new Line2D.Double(p2pos,0,p2pos,this.getSize().height);
        g2d.draw(line1);        
    }
    
}// end

Cannot resolve symbol

(but again: zie ik er geen fout in?)

[raoulduke]

Listner != Listener?

[whoami]

Code debuggen en syntax errors uit je code halen kan je zelf wel doen.

Het is niet de bedoeling van P&W dat wij dit voor jou gaan doen hoor.....

zomaar een lap code plakken en dan 2 regeltjes uitleg, da's gewoon een teken van luiheid en anderen aan het werk willen zetten, en dat tolereren we hier niet.

Daarom stel ik voor dat je de quickstart eens leest.

[ Voor 9% gewijzigd door whoami op 16-12-2003 15:27 ]