All about don krieg

Why is the snake not moving by TIMER

Sorry for the late reply. Yes i already noticed it and replace it with the code below. And i already finished with the entire code. Thanks

But one more problem. why is it the background y-axis string / ... g.drawString(i * unit, 0, i * unit , screenHeight) /
in the most right part do not fit perfectly with the length of the backgroud?

6 days ago

Game Development

Why is the snake not moving by TIMER

so in the code there is something that set x,y coordinate to (0, 0) right.
I tried to added below code and succesfully erased the red rectangle.
Correct me if my method is wrong.

In the constructor

1 week ago

Game Development

Why is the snake not moving by TIMER

Oh i get it. So in order to use my older code , i just need to add an enumvariable to control all the(up/down/right/left var). Thank you.

How about my second questions for the red rectangle that appear in the top left background. Do you have any idea about it ?

I already fixed it as below. Kindly please check for the red rectangle on the top left.
I dont know why it only appear for 1 second and then vanish. / Kindly refer to my last comment on the below part

package snake;
import javax.swing.JPanel;
import java.awt.Dimension;
import java.awt.Color;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Graphics;
import javax.swing.Timer;
import java.util.Random;
import java.awt.event.KeyListener;
import java.awt.event.KeyEvent;
public class PANEL extends JPanel implements ActionListener, KeyListener {
int screenWidth = 600;
int screenHeight = 600;
int unit = 20;
int gameUnit = (screenWidth * screenHeight) / unit;
int x[] = new int[gameUnit];
int y[] = new int[gameUnit];
int initial = 6;
int appleX;
int appleY;
boolean running = false;
Timer t;
Random r;
final int up = 1;
final int down = 2;
final int right = 3;
final int left = 4;
int dir;
private static final long serialVersionUID = 1L;
PANEL() {
this.setPreferredSize(new Dimension(600, 600));
this.setBackground(Color.black);
r = new Random();
startGame();
x[0] = 400;
y[0] = 400;
this.addKeyListener(this);
this.setFocusable(true);
dir = up;
}
public void startGame() {
running = true;
apple();
t = new Timer(100, this);
t.start();
}
public void apple() {
//apple, x and y coordinate
appleX = r.nextInt((int)(screenWidth / unit)) * unit;
appleY = r.nextInt((int)(screenHeight / unit)) * unit;
}
public void move() {
for(int i = initial; i > 0; i--) {
x[i] = x[i - 1];
y[i] = y[i - 1];
}
if(dir == up) {
y[0] = y[0] - unit;
}
else if(dir == down) {
y[0] = y[0] + unit;
}
else if(dir == right) {
x[0] = x[0] + unit;
}
else if(dir == left) {
x[0] = x[0] - unit;
}
}
public void actionPerformed(ActionEvent e) {
if(running == true) {
move();
}
repaint();
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
draw(g);
}
public void draw(Graphics g) {
  for(int i = 0; i < screenWidth / unit; i++) {
  g.drawLine(0, i * unit, screenWidth, i * unit);
  g.drawLine(i * unit, 0, i * unit, screenHeight);
 
  }
 
  g.setColor(new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255)));
  g.fillOval(appleX, appleY, unit,unit);
 
  for(int i = 0; i < initial; i++) {
  if(i == 0) {
   g.setColor(Color.green);
   g.fillRect(x[i], y[i], unit, unit);
  }
  else {
   g.setColor(Color.red);
   g.fillRect(x[i], y[i], unit, unit);
  }
  }
}
public void keyPressed(KeyEvent e) {
if(e.getKeyCode() == KeyEvent.VK_UP) {
if(dir != down) {
dir = up;
    }
}
if(e.getKeyCode() == KeyEvent.VK_DOWN) {
if(dir != up) {
dir = down;
   }
}
if(e.getKeyCode() == KeyEvent.VK_RIGHT) {
if(dir != left) {
dir = right;
}
}
if(e.getKeyCode() == KeyEvent.VK_LEFT) {
if(dir != right) {
dir = left;
    }
}
}
public void keyTyped(KeyEvent e) {
}
public void keyReleased(KeyEvent e) {
}
}

1 week ago

Game Development

Why is the snake not moving by TIMER

Thank for the reply guys. Now i get it . Based on the comments, i tried to apply it on the existed code and its WORKED.. Thanks a lot

in the constructor

in the move method()

in the keyListener method

And i discovered i can make it move with char / boolean ...Thanks a lot

And one last questions, why is it every time i compile the code , there will be a red rectangle in the most top left of the background? and it
will disappear in 2-3 seconds after i compiled it. I set red rectangle as the snake body part but why is it only this one disappear and placed over there.
I tried to look for the problem in the paint component method and altered the code a bit , but nothing happen.

#Kindly try to complile my old code in the above to see the problem

1 week ago

Game Development

Why is the snake not moving by TIMER

Thank you for the reply. Correct me if im wrong . In order to prevent that i need to delete these from the constructor right?

But in order to move the snake by Timer , i need to put only one of the above value in the constructor right?

And how about the KeyPressed part. I keep try and error countless time but nothing happen.
Please teach me what is wrong with the below part.

1 week ago

Game Development

Why is the snake not moving by TIMER

Sorry my bad. The frame class is same as as above.
The new panel class is below.

package snake;
import javax.swing.JPanel;
import java.awt.Dimension;
import java.awt.Color;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Graphics;
import javax.swing.Timer;
import java.util.Random;
import java.awt.event.KeyListener;
import java.awt.event.KeyEvent;
public class PANEL extends JPanel implements ActionListener, KeyListener {
int screenWidth = 600;
int screenHeight = 600;
int unit = 20;
int gameUnit = (screenWidth * screenHeight) / unit;
int x[] = new int[gameUnit];
int y[] = new int[gameUnit];
int initial = 6;
int appleX;
int appleY;
boolean running = false;
Timer t;
Random r;
int up, down, left, right;
private static final long serialVersionUID = 1L;
PANEL() {
this.setPreferredSize(new Dimension(600, 600));
this.setBackground(Color.black);
r = new Random();
startGame();
   //To set the initial coordinate of the snake
x[0] = 400;
y[0] = 400;
this.addKeyListener(this);
this.setFocusable(true);
               up = -2;
down = 2;
right = 2;
left = -2;
}
public void startGame() {
running = true;
apple();
t = new Timer(400, this);
t.start();
}
public void apple() {
//apple, x and y coordinate
appleX = r.nextInt((int)(screenWidth / unit)) * unit;
appleY = r.nextInt((int)(screenHeight / unit)) * unit;
}
public void move() {
for(int i = initial; i > 0; i--) {
x[i] = x[i - 1];
y[i] = y[i - 1];
}
// I added below code to make the snake move by Timer
if(up == -2) {
y[0] = y[0] - unit;
}
else if(down == 2) {
y[0] = y[0] + unit;
}
else if(right == 2) {
x[0] = x[0] + unit;
}
else if(left == -2) {
x[0] = x[0] - unit;
}
}
public void actionPerformed(ActionEvent e) {
if(running == true) {
move();
}
repaint();
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
draw(g);
}
public void draw(Graphics g) {
  for(int i = 0; i < screenWidth / unit; i++) {
  g.drawLine(0, i * unit, screenWidth, i * unit);
  g.drawLine(i * unit, 0, i * unit, screenHeight);
 
  }
 
  g.setColor(new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255)));
  g.fillOval(appleX, appleY, unit,unit);
 
  for(int i = 0; i < initial; i++) {
  if(i == 0) {
   g.setColor(Color.green);
   g.fillRect(x[i], y[i], unit, unit);
  }
  else  {
   g.setColor(Color.red);
   g.fillRect(x[i], y[i], unit, unit);
  }
  }
}
public void keyPressed(KeyEvent e) {
//what do i need to change in the below code to make it move by KeyListener?
if(e.getKeyCode() == KeyEvent.VK_UP) {
 if(up != down) {
 up = -2;
 }
}
if(e.getKeyCode() == KeyEvent.VK_DOWN) {
 if(down != up) {
 down = 2;
 }
}
if(e.getKeyCode() == KeyEvent.VK_RIGHT) {
 if(right != left) {
 right = 2;
 }
}
if(e.getKeyCode() == KeyEvent.VK_LEFT) {
 if(left != right) {
 left = -2;
 }
}
}
public void keyTyped(KeyEvent e) {
}
public void keyReleased(KeyEvent e) {
}
}

1 week ago

Game Development

Why is the snake not moving by TIMER

Sorry for the late reply .Finally i managed to maked the snake moved by timer. I just add new variables [int up, down ,left, right] to move the x x and y coordinate of the head part. Like below(i add it in move method)

1. In the constructor:
up = -2;
down = 2;
left = -2;
right = 2;

2. In the move method just add the below code

if(up == -2) {
y[0] = y[0] - unit;
}
else if(down == 2) {
y[0] = y[0] + unit;
}
else if(right == 2) {
x[0] = x[0] + unit;
}
else if(left == -2) {
x[0] = x[0] - unit;
}

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

And the for the second problem(headpart is yellow) i already solved the riddle, thanks to you guys. i figured that the headpart is actually overlapped with the body part, that is why the initial colour is yellow.

now i tried to move the snake by KeyListener but i failed a few time
even if i refer the youtube link(change the code a bit) like bellow, but nothing happen.
Please tell me what part in the code i need to change/add, because i tried for another routes but still nothing happen.

if(e.getKeyCode() == KeyEvent.VK_UP) {
if(up != down) {
up = -2;
}
}
if(e.getKeyCode() == KeyEvent.VK_DOWN) {
if(down != up) {
down = 2;
}
}
if(e.getKeyCode() == KeyEvent.VK_RIGHT) {
if(right != left) {
right = 2;
}
}
if(e.getKeyCode() == KeyEvent.VK_LEFT) {
if(left != right) {
left = -2;
}
}

1 week ago

Game Development

Why is the snake not moving by TIMER

i dont even know what missed

3 weeks ago

Game Development

Why is the snake not moving by TIMER

the x, y arrays are use to restore x, y coordinate of the snake.

Actually i dont know how the snake sets its initial position, as i only follow the youtube(above link). Eventhough i follow the flow and changed a bit of the code still stuck in the middle.

3 weeks ago

Game Development

Why is the snake not moving by TIMER

Hi Java Masters. Right now i am trying to make snake game . But i encounter problem and stuck in the middle of the process. I tried to look it again and again but cannot find where is my mistake .My questions is;

1. Why is my snake is not moving by Timer .
2. Why the headpart is YELLOW , eventhough i set it as GREEN at first.

My source:
https://www.youtube.com/watch?v=bI6e6qjJ8JQ&t=1605s

Thank you in advance.

/////////////////////////////////////////////////////////////////////
Frame class

Panel class

import javax.swing.JPanel;
import java.awt.Dimension;
import java.awt.Color;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Graphics;
import javax.swing.Timer;
import java.util.Random;
public class GAMEPANEL extends JPanel implements ActionListener {
int screenWidth = 600;
int screenHeight = 600;
int unit = 20;
int gameUnit = (screenWidth * screenHeight) / unit;
int x[] = new int[gameUnit];
int y[] = new int[gameUnit];
int initial = 6;
int appleX;
int appleY;
boolean running = false;
Timer t;
Random r;
private static final long serialVersionUID = 1L;
GAMEPANEL() {
this.setPreferredSize(new Dimension(600, 600));
this.setBackground(Color.black);
r = new Random();
startGame();
}
public void startGame() {
running = true;
apple();
t = new Timer(70, this);
t.start();
}
public void apple() {
//apple, x and y coordinate
appleX = r.nextInt((int)(screenWidth / unit)) * unit;
appleY = r.nextInt((int)(screenHeight / unit)) * unit;
}
public void move() {
for(int i = initial; i > 0; i--) {
x[i] = x[i - 1];
y[i] = y[i - 1];
}
}
public void actionPerformed(ActionEvent e) {
if(running == true) {
move();
}
repaint();
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
draw(g);
}
public void draw(Graphics g) {
//to make board x and y axis
for(int i = 0; i < screenHeight / unit; i++) {
g.drawLine(0, i * unit, screenHeight, i * unit);
g.drawLine(i * unit, 0, i * unit, screenWidth);
}
//to make apple
g.setColor(Color.red);
g.fillOval(appleX, appleY, unit, unit);
// to make snake
for(int i = 0; i < initial; i++) {
  if(i == 0) {
   g.setColor(Color.green);
   g.fillRect(x[i],y[i], unit, unit);
  }
  else {
  g.setColor(Color.yellow);
   g.fillRect(x[i],y[i], unit, unit);
 
  }
}
}
}

3 weeks ago

Game Development

Bound at the JPanel border

hi im new in java. I want to make objects bounds at the Jpanel border(so it will not excedd JPanel border), but what i did is something like below. I need to make simple calculation by subtracting the width of the image from The Jpanel width, to make it not exceed Jpanel border. But still it exceed the JPanel border slightly. and i dont know but i think there is still better method than using the subtraction method.

Before this i learned that i can use below method to make the bounding more precisely(using this.getWidth()), but only if i make the object code within class with extends Jpanel class, so that why i can use ("this") right?

So when we use different class to make the object code(that does extends Jpanel) , please teach me how to put the method (using this.getWidth()), into class with extended JPanel.
Sorry for the difficult explanation. Thanks in Advance.
Below is the full code

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.ImageIcon;
import javax.swing.Timer;
import java.awt.Color;
import java.awt.Rectangle;
import java.awt.Polygon;
import java.awt.Image;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.KeyListener;
import java.awt.event.KeyEvent;
public class f15 {
public static void main(String args[]) {
JFrame frame = new JFrame();
      frame.setSize(1200, 600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.add(new PANEL());
frame.setVisible(true);
}}
// Below is the class with extended JPanel;
class PANEL extends JPanel implements ActionListener, KeyListener {
private static f14 org1, org2;
private static f13 msh;
private static Timer t;
PANEL() {
  org1 = new f14();   // i make 2 objectss for f14 class
  org2 = new f14();    
  msh = new f13();
 
 
  t = new Timer(5, this);
  this.addKeyListener(this);
  this.setFocusable(true);
  this.setFocusTraversalKeysEnabled(false);
 
  t.start();
     
}
public void paintComponent(Graphics g) {
      super.paintComponent(g);
  Graphics2D g2d = (Graphics2D) g;
 
  g2d.drawImage(org1.getImage1(), org1.getX(), org1.getY(), null);
      g2d.drawImage(org2.getImage2(), org2.getX1(), org2.getY1(), null);
 
  g2d.setColor(Color.YELLOW);
  g2d.fillRect(msh.getX3(), msh.getY3(), 100, 100);
 
}
public void actionPerformed(ActionEvent e) {
     msh.move1();
 org2.move();
         repaint();
}
public void keyPressed(KeyEvent e) {
org2.keyPressed(e);
}
public void keyReleased(KeyEvent e) {
org2.keyReleased(e);
}
public void keyTyped(KeyEvent e) {}
}
// below is the class without the extended JPanel
class f14 {
private static ImageIcon a, b;
private static Image A, B;  
private static int x, y, x1, y1, velx1, vely1;
f14() {
// this is the background image
a = new ImageIcon("C:/Users/Admin/Desktop/mountains.png");
A = a.getImage();
   x = 0;
y = 0;
   // below is the baseball image, i want to make this image bound
b = new ImageIcon("C:/Users/Admin/Desktop/baseball.png");
B = b.getImage();
   x1 = 300;
y1 = 300;
}
// this is the part i have question about
public void move(){
 if(x1 < 0 || x1 > 1072) {
velx1 = -velx1;
}
 if(y1 < 0 || y1 > 472) {
vely1 = -vely1;
}
 x1 = x1 + velx1;
 y1 = y1 + vely1;
}  
public int getX() {
return x;
}
public int getY() {
return y;
}
public int getVelx1() {
return velx1;
}
public Image getImage1() {
return A;
}
public int getX1() {
return x1;
}
public int getY1() {
return y1;
}
public int getVely1() {
return vely1;
}
public Image getImage2() {
return B;
}
public void keyPressed(KeyEvent e) {
if(e.getKeyCode() == KeyEvent.VK_RIGHT) {
velx1 = 2;
}
if(e.getKeyCode() == KeyEvent.VK_LEFT) {
velx1 = -2;
}
if(e.getKeyCode() == KeyEvent.VK_UP) {
vely1 = -2;
}
if(e.getKeyCode() == KeyEvent.VK_DOWN) {
vely1 = 2;
}
}
public void keyReleased(KeyEvent e) {
if(e.getKeyCode() == KeyEvent.VK_RIGHT) {
velx1 = 0;
}
if(e.getKeyCode() == KeyEvent.VK_LEFT) {
velx1 = 0;
}
if(e.getKeyCode() == KeyEvent.VK_UP) {
vely1 = 0;
}
if(e.getKeyCode() == KeyEvent.VK_DOWN) {
vely1 = 0;
}
}
public void keyTyped(KeyEvent e) {}
}
class f13 {
private static Rectangle r1;
private static Polygon t1;
private static int x3, y3, velx3, vely3;
f13() {
   r1 = new Rectangle(x3, y3, 100, 100);
   x3 = 900;
   y3 = 300;
   vely3 = 2;
}
// below also
public void move1() {
   if(y3 < 0 || y3 > 550) {
vely3 = -vely3;
}
   y3 = y3 + vely3;
}
public int getX3() {
return x3;
}
public int getY3() {
return y3;
}
public int getVely3() {
return vely3;
}
}

3 months ago

Game Development

Polygon and polygon collision

i am new in 2d animation, and now learning the basic collision detection and stuck at this part . For the code below there are four objects. Rectangle, triangle, hexagon, circle(only circle is static). I can make the
rectangle - triangle collide/bounced (horizontally) each other. But when it come to hexagon - triangle (vertically), i cannot make it collide because i am using wrong method right(line 154-166) ?

What i understand from my research (youtube/ google) to get polygon-polygon collide is, we need to change the polygon to rectangle by using the code below right ? ( correct me if im wrong).

my question is
how do i use the above code to put it in the below code. and what i need to add to make hexagon - triangle collision happen. Appreciated if you can give hint or link to make me easier to understand. Thanks

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Polygon;
import java.awt.geom.Ellipse2D;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class f11 {
public static void main(String args[]) {
f10 game = new f10();
}}
class f10 extends JFrame {
f10() {
f9 gamepanel = new f9();
this.setSize(1300, 600);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
   this.setVisible(true);
   this.add(gamepanel);
}}
class f9 extends JPanel implements ActionListener{
private static Rectangle r1;
private static Polygon triangle1;
private static Ellipse2D bulat;
private static Polygon hexagon;
private static Timer t;
private static int x, x1, x2, x3, y1, y2, y3, y4, y5, y6;
   private static int xvelx, x1velx, x2velx, x3velx, y1vely, y2vely, y3vely, y4vely, y5vely, y6vely;
f9(){
//1
r1 = new Rectangle(10, 10, 100, 50);
//2
triangle1 = new Polygon(new int[]{600, 700, 800},
new int[]{300, 200, 300}, 3);
//3
   bulat = new Ellipse2D.Double(10, 400, 100, 100);
//4
   hexagon = new Polygon(new int[]{900, 966, 1030, 1100, 1030, 966},
new int[]{450, 400, 400, 450, 500, 500}, 6);
   
t = new Timer(5, this);
x = 10;
xvelx = 2;
x1 = 600;
x2 = 700;
x3 = 800;
x1velx = 2;
x2velx = 2;
x3velx = 2;
y1 = 450;
y2 = 400;
y3 = 400;
y4 = 450;
y5 = 500;
y6 = 500;
y1vely = 2;
y2vely = 2;
y3vely = 2;
y4vely = 2;
y5vely = 2;
y6vely = 2;
t.start();
}
public void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
super.paintComponent(g);
//1
   r1 = new Rectangle(x, 100, 100, 100);
g2d.setColor(Color.BLUE);
g2d.fill(r1);
//2
   triangle1 = new Polygon(new int[]{x1, x2, x3},
new int[]{200, 100, 200}, 3);
g2d.setColor(Color.GREEN);
g2d.fill(triangle1);
//3
  maru = new Ellipse2D.Double(10, 400, 100, 100);
  g2d.setColor(Color.RED);
  g2d.fill(maru);
 
//4
   hexagon = new Polygon(new int[]{900, 966, 1030, 1100, 1030, 966},
new int[]{y1, y2, y3, y4, y5, y6}, 6);
g2d.setColor(new Color(100, 25, 150));
g2d.fill(hexagon);
t.start();
   
}
public void actionPerformed(ActionEvent e) {
if(x < 0 || x + r1.getWidth() > this.getWidth()) {
xvelx = -xvelx;
}
if(x1 < 0 || x3 > this.getWidth() || x2 < 0 || x2 > this.getWidth()) {
x1velx = -x1velx;
x2velx = -x2velx;
x3velx = -x3velx;
}
if(y2 < 0 || y3 < 0 || y5 > this.getHeight() || y6 > this.getHeight()) {
 y1vely = -y1vely;
 y2vely = -y2vely;
 y3vely = -y3vely;
 y4vely = -y4vely;
 y5vely = -y5vely;
 y6vely = -y6vely;
}
/* i know this part is problem
if(triangle1.intersects(hexagon)) {
y1vely = -y1vely;
y2vely = -y2vely;
y3vely = -y3vely;
y4vely = -y4vely;
y5vely = -y5vely;
y6vely = -y6vely;
x1velx = -x1velx;
x2velx = -x2velx;
x3velx = -x3velx;
}
*/
if(triangle1.intersects(r1)) {
xvelx = -xvelx;
x1velx = -x1velx;
x2velx = -x2velx;
x3velx = -x3velx;
}
    x += xvelx;
    x1 -= x1velx;
    x2 -= x2velx;
    x3 -= x3velx;
y1 += y1vely;
y2 += y2vely;
y3 += y3vely;
y4 += y4vely;
y5 += y5vely;
y6 += y6vely;
    repaint();
}
}

3 months ago

Game Development

triangle - rectangle collision noyt happen

Dave Tolls , thank you so much for your answer. Now i know the reason. Thanks

3 months ago

Game Development

triangle - rectangle collision noyt happen

I make 2 objects(1. triangle (java.awt.polygon) and 2. rectangle(java.awt.rectangle)) and moved these objects by TIMER . My aim is to make these 2 objects collide and bounce back each other. The problem is Why they are not colliding and bounce (they only overlapped each other), when i used the (..if(intersect..) part(refer code below). The compiler(cmd) encounter error saying ["no suitable method found for intersects(Polygon)"].

i feel weird because before this when i create 2 rectangle(use java.awt.Rectangle) and using the (..if(intersects)...) it work perfectly. These 2 rect touch and bounced each other. I stuck at these part and I need a DEEPER answer to this, what does the error mean ? Thanks

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import java.awt.Polygon;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Color;
import java.awt.Rectangle;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class f10 {
   public static void main(String args[]) {
       f8 game = new f8();
   }
}
class f8 extends JFrame {
   f8() {
       f9 panel = new f9();
       this.setSize(1800,600);
       this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       this.setVisible(true);
       this.setLocationRelativeTo(null);
       this.add(panel);
   }
}
class f9 extends JPanel implements ActionListener {
   private static Polygon triangle1;
   private static Rectangle r1;
   private static int x, velx, x1, x2, x3, velx1, velx2, velx3;
   private static Timer t;
   f9() {
       //1
       r1 = new Rectangle(700, 200, 50, 30);
       //2
       triangle1 = new Polygon(new int[]{200, 300, 400},
       new int[]{200, 100, 200}, 3);
       
       t = new Timer(5, this);
       x = 700;
x1 = 200;
x2 = 300;
x3 = 400;
       velx = 2;
velx1 = 2;
velx2 = 2;
velx3 = 2;
t.start();
   }
   public void paintComponent(Graphics g) {
       Graphics2D g2d = (Graphics2D) g;
       super.paintComponent(g);
       //1
       
       triangle1 = new Polygon(new int[]{x1, x2, x3},
       new int[]{200, 100, 200}, 3);
       g2d.setColor(Color.RED);
       g2d.fill(triangle1);
       //2
       r1 = new Rectangle(x, 100, 200, 100);
       g2d.setColor(Color. BLUE);
       g2d.fill(r1);
       
   }
   public void actionPerformed(ActionEvent e) {
       if(x < 0 || x + r1.getWidth() > this.getWidth()) {
           velx = -velx;
       }
        if(x1 < 0 || x3 > this.getWidth()) {
           velx1 = -velx1;
velx3 = -velx3;
velx2 = -velx2;
}
       //  maybe the cause of the cmd error is from the code below  
if(r1.intersects(triangle1)) {
velx = -velx;
           velx1 = -velx1;
velx3 = -velx3;
velx2 = -velx2;
}
      x += velx;
x1 += velx1;
x2 += velx2;
x3 += velx3;
       repaint();
   }
}

3 months ago

Game Development

[JAVA] how to move the triangle by timer

Hi guys, for the code below i managed to make the rectangle moved to the left and bounce back at jpanel width. But how to make the triangle move horizontally (doesnt matter to the left or right) ? Before this i can make the triangle move by pinpoint the triangle coordinate point by using {..triangle.addPoint(x, y)...} . but when i used to make the triangle using constructor and arrays, how can i make the triangle move by TIMER? What need i do with the x1 and velx1 variable?

Thank you

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import java.awt.Polygon;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Color;
import java.awt.Rectangle;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class f10 {
public static void main(String args[]) {
f8 game = new f8();
}}
class f8 extends JFrame {
f8() {
   f9 panel = new f9();
this.setSize(1800,600);
   this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   this.setVisible(true);
   this.setLocationRelativeTo(null);
   this.add(panel);
}}
class f9 extends JPanel implements ActionListener {
private static Polygon triangle1;
private static Rectangle r1;
private static int x, velx, x1, y1, velx1;
private static Timer t;
f9() {
//1
r1 = new Rectangle(700, 200, 50, 30);
//2
int[] x1 = {200, 300, 400};
   int[] y1 = {200, 100, 200};
   triangle1 = new Polygon(x1, y1, 3);
t = new Timer(5, this);
x = 700;
velx = 2;
}
public void paintComponent(Graphics g){
Graphics2D g2d = (Graphics2D) g;
super.paintComponent(g);
//1
   int[] x1 = {200, 300, 400};
   int[] y1 = {200, 100, 200};
triangle1 = new Polygon(x1, y1, 3);
   g2d.setColor(Color.RED);
   g2d.fill(triangle1);
//2
r1 = new Rectangle(x, 100, 200, 100);
g2d.setColor(Color. BLUE);
g2d.fill(r1);
t.start();
}
public void actionPerformed(ActionEvent e) {
if(x < 0 || x + r1.getWidth() > this.getWidth()) {
velx = -velx;
}
x += velx;
repaint();
}
}

4 months ago

Game Development

don krieg

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