I have a simple JPanel so far, and some basic elements like a string to display, a rectangle and a JButton, all on this panel. When I click with the mouse on this panel, I want the things that use the custom color 'rainbowColor' change their color to exactly that color ( the string and the rectangle ).
int red = 0;
int green = 255;
int blue = 0;
Color rainbowColor = new Color(red, green, blue);
boolean whichColor = true;
if (whichColor) { red = 255; blue = 0; whichColor = false; }
else { red = 0; blue = 255; whichColor = true; }
My 'TEXT' appears to be green all the time, no matter if I click my panel. At least this means the code works in some way. I still don't understand: the code says that 'whichColor' is set to true, so it should set 'red' to 255. Only the 'paintComponent { ... }' part is important ( my guess ) in this case. I really don't know what have I done wrong, thank you very much for helping me!
package game;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Menu extends JPanel {
public void paintComponent(Graphics g) {
int margin = 4;
int red = 0;
int green = 255;
int blue = 0;
Color rainbowColor = new Color(red, green, blue);
boolean whichColor = true;
if (whichColor) { red = 255; blue = 0; whichColor = false; }
else { red = 0; blue = 255; whichColor = true; }
super.paintComponent(g);
Font customFont = new Font("Dialog", Font.BOLD, 20);
g.setFont(customFont);
g.setColor( new Color(0,0,0));
g.drawString( "TEXT", 20, 30 );
// randomiseColor(randomColor);
g.setColor(rainbowColor);
g.drawString( "TEXT", 22, 32 );
g.drawRect(margin, margin, getWidth() - margin*2 - 1, getHeight() - margin*2 - 1);
}
}
public static class RandomColorOnClick implements MouseListener {
public void mousePressed(MouseEvent evt) {
Component source = (Component)evt.getSource();
source.repaint();
}
public void mouseClicked(MouseEvent evt) { }
public void mouseReleased(MouseEvent evt) { }
public void mouseEntered(MouseEvent evt) { }
public void mouseExited(MouseEvent evt) { }
}
public static void main(String[] args){
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
double width = screenSize.getWidth();
double height = screenSize.getHeight();
RandomColorOnClick colorListener = new RandomColorOnClick();
ButtonHandler listener = new ButtonHandler();
Menu main_text = new Menu();
JPanel main_content = new JPanel();
JFrame main_window = new JFrame("Some random text");
JButton main_exit_button = new JButton("Exit");
main_content.addMouseListener(colorListener);
main_window.setContentPane(main_content);
main_window.setSize(800, 600);
main_window.setLocation(((int)width / 2) - 400, ((int)height / 2) - 300);
main_window.setVisible(true);
main_window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
main_content.setLayout(new BorderLayout());
main_content.add(main_text, BorderLayout.CENTER);
main_exit_button.addActionListener(listener);
}
there are 2 problems
1) you have create boolean whichColor=true; inside the paintComponent() method(); so every time it draw the graphics, it creates a whichcolor variable and it's always true.create it outside of paintcomponent method as a instance variable .
2) creating color variable before change the colors.you are creating color variable but you change color after that.so color variable remain unchanged.
Color rainbowColor = new Color(red, green, blue);
.that's why it's always green. you and move color creating line after the if-else condition .but you can declare it outside and change color instead of creating again and again.
here is an example ...
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Menu extends JPanel {
private boolean whichColor = true;
private Color rainbowColor;
public void paintComponent(Graphics g) {
int margin = 4;
int red = 0;
int green = 255;
int blue = 0;
if (whichColor) {
red = 255;
blue = 0;
whichColor = false;
} else {
red = 0;
blue = 255;
whichColor = true;
}
rainbowColor = new Color(red, green, blue);
super.paintComponent(g);
Font customFont = new Font("Dialog", Font.BOLD, 20);
g.setFont(customFont);
g.setColor(new Color(0, 0, 0));
g.drawString("TEXT", 20, 30);
// randomiseColor(randomColor);
g.setColor(rainbowColor);
System.out.println(rainbowColor);
g.drawString("TEXT", 22, 32);
g.drawRect(margin, margin, getWidth() - margin * 2 - 1, getHeight() - margin * 2 - 1);
}
public static void main(String[] args) {
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
double width = screenSize.getWidth();
double height = screenSize.getHeight();
RandomColorOnClick colorListener = new RandomColorOnClick();
ButtonHandler listener = new ButtonHandler();
Menu main_text = new Menu();
JPanel main_content = new JPanel();
JFrame main_window = new JFrame("Some random text");
JButton main_exit_button = new JButton("Exit");
main_content.addMouseListener(colorListener);
main_window.setContentPane(main_content);
main_window.setSize(800, 600);
main_window.setLocation(((int) width / 2) - 400, ((int) height / 2) - 300);
main_window.setVisible(true);
main_window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
main_content.setLayout(new BorderLayout());
main_content.add(main_text, BorderLayout.CENTER);
main_exit_button.addActionListener(listener);
}
}
class RandomColorOnClick implements MouseListener {
public void mousePressed(MouseEvent evt) {
Component source = (Component) evt.getSource();
source.repaint();
}
public void mouseClicked(MouseEvent evt) {
}
public void mouseReleased(MouseEvent evt) {
}
public void mouseEntered(MouseEvent evt) {
}
public void mouseExited(MouseEvent evt) {
}
}