Swing/AWT/SWT :: Changing Rectangle Color With MouseListener
Mar 2, 2014
I'm trying to build a program which sets a fill color for a rectangle. Each time the mouse is clicked the fill color changes according to the position of the mouse's X and Y. I succeeded to create a JFrame with a changing background according to the Mouse's position, but I can't seem to change the color of the rectangle (defined in MyPanel class).
This is the current code,
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.SwingUtilities;
import javax.swing.JFrame;
[Code]...
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Jan 29, 2015
Color only changes, when resizng frame with mouse, not when clicking.
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class SimpleGui1 implements ActionListener {
JFrame frame;
MyDrawnPanel drawnPanel;
[Code] .....
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Oct 23, 2014
is there a good way to change the color of a JList item that isn't selected? I'm throwing my hand at building a client/server chat app and on the client side, I need to highlight the name of the person (which is in a JList) who has sent a message to the client GUI.
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Sep 5, 2014
My program has a MainFrame(extends JFrame)class and BasePanel(extends JPanel) class,and many other panels.I had used Images with JLabel in BasePanel.My current panel in MainFrame is BasePanel.I had used MouseListener so that when I click on any of the label it should show Other panel in same MainFrame and hide the BasePanel.But I am getting some problem with that.When I click on the Label,It hides the BasePanel but do not show the new Panel(Dictionary Panel in my code). In short when label is clicked I want to make DictionaryPanel visible and BasePanel invisible,both in MainFrame. I am using the following code on Label:
//constructor of BasePanel class
public BasePanel() {
dict=new Dictionary();
mf=new MainFrame();
dictLabel.addMouseListener(new MouseListener() {
public void mouseReleased(MouseEvent arg0) {
[Code] ....
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Feb 10, 2014
My code is
Double qty = 0.0;
for ( int i = 0; i < ingTable.getRowCount(); i++){
qty = (Double) ingTable.getValueAt(i,2);
if( qty < 30.0){
ingTable.setBackground(Color.red);
} else {
ingTable.setBackground(Color.white);
}
}
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Jun 9, 2014
What I'm trying to do is basically draw a Rectangle outline through left-click and then dragging the mouse to the size one wants.
After one has created this rectangle, the user can change the color of the rectangle through clicking the 3 sliders found on the top in the program. Upon the change in color, the rectangle should change from "g.drawRect" to "g.fillRect" and use the desired color.
I have the basic outline of the program done, but working with the last part (the color and changing of the Rectangle type after changing the color)
Is there like a "then" command in Java? Like: after you've done x, do y. That would make this heaps easier.
import java.awt.event.*;
import java.awt.*;
import java.applet.*;
//Diese Applikation offnet ein Fenster,
//in welchem durch einen gehaltenen linken Mouse Klick
//ein Reckteck gezeichnet wird
public class WhatIsTheProblem006 extends Applet
implements AdjustmentListener {
[Code] ....
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Oct 20, 2014
The Toys of the Future Company has decided to issue a new line of toy robots. While they are not sure exactly what their robots will look like, they do know the functionality that they will all have. All robots will be able to move forward, turn right, turn left, spin and detect an object in front of it via a sensor. The robot will use a touch sensor to determine whether it has hit an object in front of it, such as a wall. The robot will have two, three, or four wheels, but it will only be driven by two of them: a right wheel and a left wheel. Each wheel will be attached to a motor that controls it.
* ^ this is only something to think about
Produce a UML class diagram.
Using UML, describe the objects and classes that will be associated with this new toy. Either hand draw or use an appropriate UML creation tool to generate a UML design document for your Robot class. Create a set of classes that can be used to control the robot.
Develop your new class.
Create a new NetBeans project entitled, "Assignment_8_1" and develop your new class. Now, using the objects and classes that you have written, write a program for your robot that allows it to move in a large square. Allow your robot to run in a big two dimensional array and every time the robot encounters a square in your array, turn that square black.
So here is the code for the moving ball:
package ballapplet;
import java.awt.*;
import java.util.Formatter;
import javax.swing.*;
public class BallApplet extends JPanel {
private static final int BOX_WIDTH = 640;
[Code] ....
I want to know how to change the color of an object, and how to move it in specific directions.
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Mar 8, 2014
is any simple way to apply the same code on both ActionListener and MouseListener, so that the same code is executed when the user either presses a JButton or presses Enter when a JTextField is focused.I know that I can define a method, while it is not preferred as I may use break; in my MouseListener.
A simple example:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TwoListener extends JFrame
{
[code]....
Although I can define a new method that prints out the three numbers, I have to add certain break; code in different cases. So I just wonder whether there is another way to do things like this.
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Aug 13, 2014
I know that JMenu and JMenuItem is suppose to use action listeners but would you consider this implementation an exception?
menuAbout.addMouseListener (new MouseListener () {
@Override
public void mouseClicked (MouseEvent arg0) {
JOptionPane.showMessageDialog (null, "Server Tec Software System
}
@Override
public void mouseEntered (MouseEvent arg0) { }
@Override
public void mouseExited (MouseEvent arg0) { }
@Override
public void mousePressed (MouseEvent arg0) { }
@Override
public void mouseReleased (MouseEvent arg0) { }
});
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Nov 15, 2014
I would like to draw a rectangle around a certain part of an image.
So I wrote this:
Pixel[] pixels = scene.getPixels();
for( Pixel pixel : pixels)
{
if(pixel >= point.getX() && pixel <= (point.getX()+p2.getWidth())
{
pixel.setGreen(150);
}
}
But the error is giving me incompatible types. I would like to set all the pixels at a certain point up to the dimensions of my rectangle and so on. How would I do that?
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May 2, 2014
In the image, the color of the frame of the window/JFrame is black. My question is that can we set the color of this frame, or is it just provided by the operating system and whatever color is default color of windows in an operating system will appear in our application?
I am talking about the frame, the boundary in the JFrame container which contains the close, maximize, and minimize buttons.
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Oct 7, 2014
I am trying to create a virus simulation program. The program is supposed to just be a map of the world where the user can click any country in the world to specify where they want their virus to start, specify how transmittable the virus is, and be able to see how the virus spreads through the world by seeing a change in color throughout the world,
I want the world map to initially start out with a very light yellow, and as areas of the world slowly start to get more and more infected by the virus, I want those areas on the map to start changing to a very dark red (going from a light yellow, through shades of orange and red, to dark red).
So, the main idea of this is to have a program that displays an image where certain parts of the image will slowly change color during the runtime of the program. I obviously know how to change colors of certain parts of a window or even an image, and how to even start this.
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Mar 20, 2015
I'm struggling to change the colour of the X and Y axis. I can change the colour of the ticks and the tick labels in CSS... But not the axis themselves.
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Oct 29, 2014
how to change the color of an output element in Eclipse? Can't seem to find it anywhere on the internet.For example, a response to my question 'What color do you want?' could be 'red'. I added an if-statement, which states if input = red, start using a red colored 'X' as string for further output.How do I obtain the color red for my X?? Or isn't it possible changing the color of output elements?
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Oct 7, 2014
I am trying to create a virus simulation program. The program is supposed to just be a map of the world where the user can click any country in the world to specify where they want their virus to start, specify how transmittable the virus is, and be able to see how the virus spreads through the world by seeing a change in color throughout the world,
I want the world map to initially start out with a very light yellow, and as areas of the world slowly start to get more and more infected by the virus, I want those areas on the map to start changing to a very dark red (going from a light yellow, through shades of orange and red, to dark red).
So, the main idea of this is to have a program that displays an image where certain parts of the image will slowly change color during the runtime of the program. I obviously know how to change colors of certain parts of a window or even an image, but this is very very detailed and advanced but how to even start this.
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Nov 9, 2014
I have a JList<Object> in my code (it actually takes JLabels) called imageList, and I've given it a custom CellRenderer using the following code:
cellRenderer = new DefaultListCellRenderer() {
private static final long serialVersionUID = 1L;
@Override
public Component getListCellRendererComponent(JList<?> list,
Object value, int index, boolean isSelected,
boolean cellHasFocus) {
[Code] .....
However, when I click anywhere on the JList, nothing gets printed to the console, which suggests that the mousePressed() method isn't being invoked. I think it's a problem with the CellRenderer, because I have similar code elsewhere that works, the only difference being I don't use a custom CellRenderer.
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Apr 13, 2014
Is there a way to simply slap a rectangle into a JPanel (make it appear) with out creating an inner Class or helper Method, all within "Main"? And if not, why?
Making a JFrame is easy.
Adding a JPanel is a snap.
import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class TheJFrame {
public static void main(String[] args) {
// TODO Auto-generated method stub
[code]....
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Mar 4, 2014
I have run into a bit of a head scratcher, at least to me. I am building multiple rectangles using double precision. I had to switch from int to double due to another issue that requires decimal places. Now, my fillRect (last line in the code section I posted) is causing an error as it only wants to work with int.
public void draw(Graphics2D g2) {
// check that sizes are above 0
if ((rectWidth <= 0) || (rectHeight <= 0))
[Code]....
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Feb 19, 2015
It's very simple, I've added an AWT component/control (specifically a Choice object to a Frame. It's a pop-up menu by any other name.
Above the pop-up, there's a label. I'm trying to change its font to no success.
* I create Label object called label1: Label label1 = new Label("This is a pop-up")
* I create a Font object called f: Font f = new Font("Times New Roman, Font.BOLD, 18)
* I apply the new font to the label: (in AFrame's constructor) label1,setFont(f)
When displayed the label's font seems to be stuck on Arialor something similar. Changing the point size however does have an effect.
import java.awt.Choice;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
/**
* Defines a 'pop-up' AWT control that will be added to AFrame.
* It extends Choice - I may need extra functionality later.
*/
public class APopUp extends Choice implements ItemListener {
// instance variables
int noi; // no of items
String selected; // item selected from choice
[Code] ....
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Jun 22, 2014
I'm currently having trouble with a Breakout clone that I'm working on when I want to change the scenes of the game. When I start out with the main menu and I hit play, the main menu calls for the StateManager to remove the MainMenu and then to add the GameState to start playing through the levels. But, whenever this is done it just gives a NullPointerException and freezes the game. I know the code for initially starting a State is fine because that is the same way the MainMenu is loaded but there seems to be an issue with changing from one to another...
This is the StateManager class that adds and removes the States/Canvases to and from the JFrame/Main class:
package com.pathtocreating.Breakout_V2.state;
import java.awt.BorderLayout;
import java.util.ArrayList;
import javax.swing.JFrame;
public class StateManager {
private ArrayList<State> states;
[Code] ....
The code that calls the change of state in MainMenuState is called in the update method:
if(inputController.isMouseClicked("LeftClick")) {
if(playHover) {
soundManager.playSound("ButtonClick");
BreakoutMain.sm.changeStates("GameState");
[Code] ....
Here is the full stack trace when clicking the area to change states:
Exception in thread "Thread-2" java.lang.NullPointerException
at sun.java2d.SunGraphics2D.validateColor(Unknown Source)
at sun.java2d.SunGraphics2D.<init>(Unknown Source)
at sun.awt.image.SunVolatileImage.createGraphics(Unknown Source)
[Code] ...
It gives that same value both before and after clicking on the region.
Printing out b after the State is changed to GameState gives the following:
java.awt.Component$BltSubRegionBufferStrategy@66116674
I've tried messing around with the order of which things are added/loading from the StateManager but am just failing to see what I did wrong.
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May 26, 2014
Create a dnd (dungeons and dragons) character creator and back ground generator, have it display and run on a gui, to start with i decided to creator the gui as i go so i can see the progress, first i tried eclipse and windows builder, well after 1 day of reinstalling windows builder in about 5 different ways from multiple guides and sometimes getting it to partly work ...
After doing some more research I have figured out how to get the main program to display the gui . Heres what i have:
package com.mrgreaper;
import javax.swing.*;
public class MainWindow {
private JPanel mainWindow;
private JLabel playerlbl;
private JLabel playerNamelbl;
[Code] .....
Now this works fine and the gui displays when the program is run but I can't change the text of any of the jlabels or textfield. If I try to do it in the main class i need to change them from private to public static but then in the form builder it says "cannot bind to static field *name of field*" but if i take static off then i cant change its value!
From what i understand this is because the window is an instance, so how to i change the value in that instance? I could put all my code in the one class, the one that creates the gui, but i really want it seperate, i would like the gui to update as the code runs... So how do i do it, how do i change the contents of jlabels on the fly, read the contents of text boxes on the fly etc....
I tried adding a getter setter
public void setCharFirst(JLabel charFirst) {
this.charFirst = charFirst;
}
in the MainWindow.class
Then i tried to set it from my main function
MainWindow.setCharFirst("test");
but it cant access it as my main function is static and it is not now can i make it static...
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Apr 6, 2014
When I click a JButton, it will become blue momentarily. Is it possible to change the blue color? If yes, how?
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Sep 20, 2014
I don't get what I missed in the code. I used the example of changing the text of a button by clicking on it, but instead I also added a JLabel and tried to make the button change its text instead, but it didn't work. What did I do wrong?
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
class Buttone implements ActionListener{
JLabel label;
JButton button;
[Code] ....
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Jun 22, 2014
I want to switch panel on click of a button and code for switching panels is written in update method (Which gets called from notify observer of another class as part of Observer pattern.
unoGameController.playGame(playerFirst.getText(), playerSecond.getText());
playGame in Panel 1 of class 1 calls another class (class 2)and data comes in update method of class 1(Observer interface).
Now for switching panels code is in gameControllerDataProcessing . I am not able to switch the panels when this functionality runs.
However if i dont call the unoGameController.playGame(playerFirst.getText(), playerSecond.getText() and directly call the update method or directly write the switching panel code . then it works fine.
btnNewButton_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if((!(playerFirst.getText().equalsIgnoreCase("") ||playerSecond.getText().equalsIgnoreCase(""))&&(!playerFirst.getText().equalsIgnoreCase(playerSecond.getText())) ) ){
unoGameController.playGame(playerFirst.getText(), playerSecond.getText());
[Code] .....
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Nov 13, 2014
I'm working on a standalone GUI under Windows using JAVA SWT and eclipse. I have a colour scheme based on six colours inplemented as:
RGB rgb01=new RGB(233, 150, 122);
final Color color01=new Color(Display.getCurrent(),rgb01);
RGB rgb02=new RGB(250, 128, 114);
final Color color02=new Color(Display.getCurrent(),rgb02);
RGB rgb03=new RGB(255, 160, 122);
final Color color03=new Color(Display.getCurrent(),rgb03);
RGB rgb04=new RGB(255, 165, 0);
final Color color04=new Color(Display.getCurrent(),rgb04);
RGB rgb05=new RGB(255, 140, 0);
final Color color05=new Color(Display.getCurrent(),rgb05);
RGB rgb06=new RGB(255, 127, 80);
final Color color06=new Color(Display.getCurrent(),rgb06);
I have 8 sets of six colours prepared. I'd like to let the user choose a colour scheme and even change it while they use the application.
As can be seen the Color s are with final as if they are not the code below gives an error.
if (script_deletion_flag[x]!=null && script_deletion_flag[x]) {
itemDBAB1.setForeground(color04);
}
else
{
itemDBAB1.setForeground(color03);
}
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Jan 27, 2013
refer to this code~
import java.awt.GridLayout;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.Color;
import javax.swing.JButton;
[Code] ....
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