Rannoc

I asked this already, but with adding more details, I ran out of space.

this is a test program I wrote to try to get the KeyListener to work, My file builds correctly, there are no errors that I can see. The mouse does the job and changes the color, but they keyboard doesn't. I am fuddled. thanks for any help you can offer

Viewer class:

import javax.swing.*;

import java.awt.*;

public class Viewer {

public static void main(String[] args) {

JFrame theGUI = new JFrame("Keyboard Test");

Container pane = theGUI.getContentPane();

MyPanel panel = new MyPanel();

theGUI.setSize(200, 200);

theGUI.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE);

pane.add(panel);

theGUI.setVisible(true);

}

}//end of Viewer

//////////////////////////////////////…

//paint component class:

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

import java.util.Random;

public class MyPanel extends JPanel implements KeyListener, MouseListener{

int r = 50;

int gr = 50;

int b = 50;

Random random = new Random();

MyPanel(){

this.addKeyListener(this);

this.addMouseListener(this);

}

public void paintComponent(Graphics g){

super.paintComponent(g);

setBackground(new Color(r,gr,b));

}

public void changeColor(){

r = random.nextInt(256);

gr = random.nextInt(256);

b = random.nextInt(256);

repaint();

}

public void keyTyped(KeyEvent e) {changeColor();}

public void keyPressed(KeyEvent e) {changeColor();}

public void keyReleased(KeyEvent e) {changeColor();}

public void mouseExited(MouseEvent e) {changeColor();}

public void mouseEntered(MouseEvent e) {changeColor();}

public void mouseReleased(MouseEvent e) {changeColor();}

public void mousePressed(MouseEvent e) {changeColor();}

public void mouseClicked(MouseEvent e) {changeColor();}

}

It has been a few years since I've programmed in Java, so I'm trying to refresh my memory. I am making a snake game, and I can't quite get they keyboard input to work. My file builds correctly, there are no errors that I can see. I seem to remember that there was an easy fix to this problem, by moving the "addKeyListener(new keyListener());" to a different spot in the project. Either somewhere inside the Viewer class, or in the actual game class.

here is the relevant code

File: Games.java

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.util.Scanner;

import java.util.Random;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import java.awt.image.MemoryImageSource;

public class Games extends JPanel{

int sx = 200;

int sy = 700;

int s1dir = 1;

int counter=0;

Games(){

setMouse();

editImages();

addMouseListener(new PanelListener());

addMouseMotionListener(new PanelListener());

addMouseWheelListener(new PanelListener());

addKeyListener(new keyListener());

}

private Random random = new Random();

private javax.swing.Timer timer;

public void paintComponent(Graphics g){

super.paintComponent(g);

//bunch of graphics code here

timer = new javax.swing.Timer(10, new MoveListener());

timer.start();

}//end of paintComponent

private void setMouse(){...}//replaces the mouse with a custom image

private void editImages(){...}//resizes background images, and snake images

private class MoveListener implements ActionListener{...}//for the timer

// I tested the program with a mouse instead of a keyboard, and that works fine

private class PanelListener extends MouseAdapter {...}//for mouse tests

private class keyListener extends KeyAdapter{

public void keyTyped(KeyEvent e) {

//do nothing here yet

}//end keyTyped

public void keyPressed(KeyEvent e) {

sx = 200;

sy = 700;

}//end keyPressed

public void keyReleased(KeyEvent e) {

}//end keyReleased

}//end keyListener

}//end Games class

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

File - ClassViewer.java

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class ClassViewer {

private static JFrame theGUI = new JFrame("Game play");

private static Container pane = theGUI.getContentPane();

private static Games game = new Games();

public static void main(String[] args) {

setWindow();

menu();

}//end main

//sets up the window

private static void setWindow(){

theGUI.setSize(850, 850);

theGUI.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

theGUI.setResizable(false);

theGUI.setVisible(true);

}//end setWindow

//starts menu

private static void menu(){

theGUI.setTitle("Grid Games");

pane.add(game);

theGUI.setVisible(true);

}//end menu

}//end ClassViewer

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Thanks for the help

Is there any way to use the values given by using the solve function without manually copying them (for use inside a program).

I am dealing with quadratics, so the answer is like

"x = -2 or x = -1"

I want a way to assign the values -2 and -1 to two different variables, or to a list etc.

Thanks

I have 3 classes and I am making an RPG type of game, and I ran into a little problem I can't figure our. I need to have a method in one class that draws the monster, but the paintComponent is in a different class, Normally, when you use paintIcon inside the paintComponent, you use the word 'this' to refer to the paintComponent, but I am wondering how you refer to it when outside. I'm posting the relevant code below

code in monster class, the method i want to use to draw it :

public void monsterDraw(Graphics g, int x, int y){

monsterImage.paintIcon(???????, g, x, y);

return;

}

monsterImage is already an IconImage

like I said, if it was in the paintComponent, i would put 'this' in for the question marks, but not now.

this is the error that pops, or something like it for whatever I try.

paintIcon(java.awt.Component, java.awt.Graphics,int,int) in javax.swing.ImageIcon cannot be applied to (monster, java.awt.Graphics,int,int)

I want to use the paintComponent in a class called SothComponent.

please tell me if any more details are needed, or if I am trying to do the impossible.

thanks ahead of time.

I just recently received my TI 89 (Titanium), and I'm still not quite sure of the calculator's capabilities.

I have these two functions I am using for physics right now, quite simple functions, just very repetitive.

f(a,b,c) = √(a²+b²-2ab*cos(θ))

and

h(a,b,c) arccos([f(a²-b²-(f(a,b,c))²] / [-2b(f(a,b,c))])

i use the same a, b, and c for both equations

the equations aren't really important, they work fine, but i was wondering if there was a way to make a function that gives two answers, when i just plug in the a, b, and c once.

for a simplified example

f(x) = 3x

g(x) = 5/x

h(2) = 6 and 5/2 (h is f(x) and g(x), just in one function)

i want to know if there is a way that I can just plug x into one equation, and have both answers come up like it does when you solve for x²-4=0, it gives you x = -2 or x = 2.

the one way i did find, but it isn't any easier than just typing both is to make a program, that takes a,b, and c as parameters. but i was wondering if there was a different way.