Drawing an image at a point in another image

Question

So, I create a side scroller, and I'm trying to make the image at the point of another image.

I have a background image that is 5000 x 500, and lets say that I want to draw an image that is 25x25 by 500, 50 of the background image. How can I do it?

So far I have tried:

Coins c = new Coins(img.getWidth(this) - 4500, img.getHeight(this) - 250); 

But it just draws it at 500, 50 frames, so it "moves" in the image when I scroll to the right. I want, after scrolling once to the right, the image of the coin for drawing on the 500.50 image is still 495, 50 frames.

I could also use getGraphics for the background image and draw a smaller image on it, but I think, because I found that this is what it paints when creating the object, I cannot do this.

The symbol does not move, except up and down, only background scrolls, so I want the coin to move in the background.

PICTURES: (cannot insert it because I do not have 10 replica points) http://dl.dropbox.com/u/47632315/char.png http://dl.dropbox.com/u/47632315/coin. png http://dl.dropbox.com/u/47632315/sideScrollerBG.png

And SSCCE:

 import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.net.*; import java.awt.image.ImageObserver; import java.io.IOException; import javax.imageio.ImageIO; public class SideScroller extends JPanel implements KeyListener { public static void main(String args[]) throws Exception { SideScroller f = new SideScroller("Side Scroller"); } JFrame f = new JFrame(); int x = 0; int y = 0; int k = 10; int j = 50; int characterY = 351; boolean canJump = true; boolean keyPressed[] = new boolean[3]; Image img; Image character; Coins c = new Coins(x + 500, y + 350); public SideScroller(String s) throws MalformedURLException, IOException { img = ImageIO.read(new URL("http://dl.dropbox.com/u/47632315/sideScrollerBG.png")); character = ImageIO.read(new URL("http://dl.dropbox.com/u/47632315/char.png")); f.setTitle(s); // don't use 'magic numbers' when descriptive constants are defined! //f.setDefaultCloseOperation(3); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setResizable(false); // Better to ask when loaded. //setPreferredSize(new Dimension(1000, 500)); setPreferredSize(new Dimension(1000, img.getHeight(this))); f.add(this); f.pack(); // usually harmful, rarely necessary. // f.setLayout(null); // Looks like a splash screen //f.setLocationRelativeTo(null); // located by platform default, best. f.setLocationByPlatform(true); f.addKeyListener(this); getKeys(); // should be done last f.setVisible(true); } public void paintComponent(Graphics g) { super.paintComponent(g); g.drawImage(img, x, y, this); g.drawImage(character, 50, characterY, this); c.paint(g, this); } @Override public void keyTyped(KeyEvent e) { } @Override public void keyPressed(KeyEvent e) { int keyCode = e.getKeyCode(); if (keyCode == KeyEvent.VK_ESCAPE) { System.exit(0); } if (keyCode == KeyEvent.VK_RIGHT) { keyPressed[0] = true; } if (keyCode == KeyEvent.VK_LEFT) { keyPressed[1] = true; } if (canJump) { if (keyCode == KeyEvent.VK_SPACE) { // better to use a javax.swing.Timer here new Thread(new Runnable() { public void run() { canJump = false; for (double i = 0; i <= 5.1; i += .2) { characterY = (int) (k * i * i - j * i + 351); f.repaint(); System.out.println(characterY); System.out.println(canJump); try { Thread.sleep(25); } catch (InterruptedException e) { System.err.println(e); } } repaint(); canJump = true; } }).start(); } } } @Override public void keyReleased(KeyEvent e) { int keyCode = e.getKeyCode(); if (keyCode == KeyEvent.VK_RIGHT) { keyPressed[0] = false; } if (keyCode == KeyEvent.VK_LEFT) { keyPressed[1] = false; } } public void getKeys() { new Thread(new Runnable() { public void run() { while (true) { if (keyPressed[0]) { x -= 5; repaint(); } if (keyPressed[1]) { if (x != 0) { x += 5; repaint(); } } try { Thread.sleep(25); } catch (InterruptedException e) { System.err.println(e); } } } }).start(); } } class Coins extends pickUpObject { Image coin; public Coins(int x, int y) throws MalformedURLException, IOException{ super(x, y); super.x = x; super.y = y; coin = ImageIO.read(new URL("http://dl.dropbox.com/u/47632315/coin.png")); } public void paint(Graphics g, ImageObserver o){ g.drawImage(coin, x, y, o); } } abstract class pickUpObject { int x, y; public pickUpObject(int x, int y){ } public abstract void paint(Graphics g, ImageObserver o); } 

Answer 1

One way is to print Graphics out to Graphics2D and then translate it.

  // here we 'translate' the graphics 2D object to a separate location g2d.translate(x,0); 

Screenhsot

In this image, the character moves to the right and jumps. The coin moved to the left according to the distance that the character moved to the right.

Full code

 import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.net.*; import java.awt.image.ImageObserver; import java.io.IOException; import javax.imageio.ImageIO; public class SideScroller extends JPanel implements KeyListener { public static void main(String args[]) throws Exception { SideScroller f = new SideScroller("Side Scroller"); } JFrame f = new JFrame(); int x = 0; int y = 0; int k = 10; int j = 50; int characterY = 351; boolean canJump = true; boolean keyPressed[] = new boolean[3]; Image img; Image character; Coins c = new Coins(x + 500, y + 350); public SideScroller(String s) throws MalformedURLException, IOException { img = ImageIO.read(new URL("http://dl.dropbox.com/u/47632315/sideScrollerBG.png")); character = ImageIO.read(new URL("http://dl.dropbox.com/u/47632315/char.png")); f.setTitle(s); // don't use 'magic numbers' when descriptive constants are defined! //f.setDefaultCloseOperation(3); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setResizable(false); // Better to ask when loaded. //setPreferredSize(new Dimension(1000, 500)); setPreferredSize(new Dimension(1000, img.getHeight(this))); f.add(this); f.pack(); // usually harmful, rarely necessary. // f.setLayout(null); // Looks like a splash screen //f.setLocationRelativeTo(null); // located by platform default, best. f.setLocationByPlatform(true); f.addKeyListener(this); getKeys(); // should be done last f.setVisible(true); } public void paintComponent(Graphics g) { super.paintComponent(g); g.drawImage(img, x, y, this); g.drawImage(character, 50, characterY, this); Graphics2D g2d = (Graphics2D)g; // here we 'translate' the graphics object to a separate location g2d.translate(x,0); c.paint(g2d, this); } @Override public void keyTyped(KeyEvent e) { } @Override public void keyPressed(KeyEvent e) { int keyCode = e.getKeyCode(); if (keyCode == KeyEvent.VK_ESCAPE) { System.exit(0); } if (keyCode == KeyEvent.VK_RIGHT) { keyPressed[0] = true; } if (keyCode == KeyEvent.VK_LEFT) { keyPressed[1] = true; } if (canJump) { if (keyCode == KeyEvent.VK_SPACE) { // better to use a javax.swing.Timer here new Thread(new Runnable() { public void run() { canJump = false; for (double i = 0; i <= 5.1; i += .2) { characterY = (int) (k * i * i - j * i + 351); f.repaint(); System.out.println(characterY); System.out.println(canJump); try { Thread.sleep(25); } catch (InterruptedException e) { System.err.println(e); } } repaint(); canJump = true; } }).start(); } } } @Override public void keyReleased(KeyEvent e) { int keyCode = e.getKeyCode(); if (keyCode == KeyEvent.VK_RIGHT) { keyPressed[0] = false; } if (keyCode == KeyEvent.VK_LEFT) { keyPressed[1] = false; } } public void getKeys() { new Thread(new Runnable() { public void run() { while (true) { if (keyPressed[0]) { x -= 5; repaint(); } if (keyPressed[1]) { if (x != 0) { x += 5; repaint(); } } try { Thread.sleep(25); } catch (InterruptedException e) { System.err.println(e); } } } }).start(); } } class Coins extends pickUpObject { Image coin; public Coins(int x, int y) throws MalformedURLException, IOException{ super(x, y); super.x = x; super.y = y; coin = ImageIO.read(new URL("http://dl.dropbox.com/u/47632315/coin.png")); } public void paint(Graphics g, ImageObserver o){ g.drawImage(coin, x, y, o); } } abstract class pickUpObject { int x, y; public pickUpObject(int x, int y){ } public abstract void paint(Graphics g, ImageObserver o); }