awt

问题 I've been working on an program that draws custom JComponents onto a JLayeredPane however all calls to repaint() on the components seem to do nothing yet the paintComponent method is invoked automatically when the window is re-sized. I have been following some of the advice given here: Why is paint()/paintComponent() never called? But none of the solutions seem to fix my problem, update swing components on the EDT, setting component size manually before calling repaint(), calling super

问题 We were told to have 10 checkboxes and the user is only allowed to check 1-3 check boxes. After the user clicks a button indicating that he/she has completed the requirements and after the computer randomly selects a checkbox. The remaining checkbox wil be delared as a winner. This is a gaming program by the way. I'm using Swing and AWT. 回答1: You can limit a checkbox being selectable or not by disabling the component: JCheckBox checkBox = new JCheckBox("Try to click on me"); checkBox

问题 I am trying to draw a rectangle in JPanel that would translate and then rotate itself to mimic the movement of a car. I have been able to make the rectangle translate and rotate, however it rotates around the origin of (0,0). I'm very pleased that I was able to have the rectangle move and rotate as I am very new to Java GUI, but I can not seem to get how to have the rectangle rotate around itself, because I experimented more with it, and when I initialized the rectangle and rotate it 45

问题 I want to rotate text on a JPanel using Graphics2D.. My code is this: double paso=d.width/numeroBarras; double alto=datos[i].valor; Font fBarras=new Font("Serif", Font.PLAIN, 15); g2.setFont(fBarras); Rectangle2D barra=new Rectangle2D.Double(x,d.height-alto,paso,alto); //g2.fill(barra); x+=paso; g2.draw(barra); g2.rotate(-Math.PI/2); g2.setColor(Color.BLACK); g2.drawString(datos[i].titulo,(float)alto,(float)paso) This method must draw a rectangle and a text over the rectangle, but when i run

问题 I use some AWT code in my Java app which ran fine until I unit tested it on Linux Mint Debian Edition via Jenkins and Gradle: I now get that nasty java.awt.HeadlessException which is explained here. The unsuccessful unit test causes my build to fail; how do I fix that? 回答1: These are the steps that rid me of the HeadlessException: Add the Xvnc plugin to Jenkins Install VNC: sudo apt-get update && sudo apt-get install vnc4server Make sure Jenkins has a shell: sudo usermod -s /bin/bash jenkins

问题 I am trying to move a ball in applet using thread but its not moving. Can anyone help me out as m new to applet and proceeding for game development..for reference here is my code public class ballGame extends JApplet implements Runnable { int x_pos=50; int y_pos=100; int rad=10; Thread t; public void start() { super.start(); t=new Thread("t"); t.start(); } public void paint(Graphics g) { super.paint(g); g.setColor(Color.red); setBackground(Color.BLACK); g.drawOval(x_pos,y_pos,2*rad,2*rad);

问题 I am trying to move a ball in applet using thread but its not moving. Can anyone help me out as m new to applet and proceeding for game development..for reference here is my code public class ballGame extends JApplet implements Runnable { int x_pos=50; int y_pos=100; int rad=10; Thread t; public void start() { super.start(); t=new Thread("t"); t.start(); } public void paint(Graphics g) { super.paint(g); g.setColor(Color.red); setBackground(Color.BLACK); g.drawOval(x_pos,y_pos,2*rad,2*rad);

问题 I have a problem with Robot class in Java: it sometimes doesn't work when i run a fullscreen game. Here's my code: Toolkit tlkt = Toolkit.getDefaultToolkit(); Robot bot = new Robot(); while(true) { Thread.sleep(3000); tlkt.beep(); //make sure that program still runs bot.mousePress(MouseEvent.BUTTON1_DOWN_MASK); bot.mouseRelease(MouseEvent.BUTTON1_DOWN_MASK); } I want to left-click every 3 seconds and beep for sure. It work fine but when I run some full-screen application, then it just beeps

问题 I have a problem with Robot class in Java: it sometimes doesn't work when i run a fullscreen game. Here's my code: Toolkit tlkt = Toolkit.getDefaultToolkit(); Robot bot = new Robot(); while(true) { Thread.sleep(3000); tlkt.beep(); //make sure that program still runs bot.mousePress(MouseEvent.BUTTON1_DOWN_MASK); bot.mouseRelease(MouseEvent.BUTTON1_DOWN_MASK); } I want to left-click every 3 seconds and beep for sure. It work fine but when I run some full-screen application, then it just beeps

问题 I am aware this is my error. My question is why isn't this working what am i missing i can call this is i put it a method instead of a class so i am assuming theirs something wrong with the third class? Class 1: package assignment.pkg1.java; import java.awt.Color; import javax.swing.JFrame; public class JVMVeiwer { /** * @param args the command line arguments */ public static void main(String[] args) { final int FRAME_WIDTH = 1000; // Frame Width final int FRAME_HEIGHT = 800; // Frame Height