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    <p>Overall, the approach you're learning from your book is far from ideal for games but I touched up the code anyway. </p> <pre><code>import java.awt.*; import java.net.*; import java.awt.event.*; import java.awt.geom.*; import java.applet.*; public class DisplayImage extends Applet implements KeyListener{ int coordX=0;//ship x axis position int coordY=0;//ship y axis position /* 0-------------------------x 0| | | | | | y */ public URL getURL(String filename) { URL url = null; try { url = this.getClass().getResource(filename); } catch(Exception e){e.printStackTrace();} return url; } private Image image; public void init() { image = getImage(getURL("spaceship.png")); addKeyListener(this); } public void update(){repaint();}//let update control the calls to repaint public void paint(Graphics g) { Graphics2D g2d = (Graphics2D)g; g2d.setColor(Color.BLACK); g2d.fillRect(0,0,getSize().width,getSize().height); g2d.drawImage(image,coordX,coordY,this);//paint the spaceship to the updated coordinates } public void keyPressed(KeyEvent e) { int keycode = e.getKeyCode(); //37=left arrow. 39=right arrow. 38=up &amp; 40=down if(keycode==37){coordX-=1;}else if(keycode==39){coordX+=1;} if(keycode==38){coordY-=1;}else if(keycode==40){coordY+=1;} update();//request repaint when logic has updated } public void keyTyped(KeyEvent e){} public void keyReleased(KeyEvent e){} } </code></pre> <p>Cheers</p> <p>EDIT:: This is the basic concept you want to work on.</p> <pre><code>private void mainGameLoop(){ while(pause==false){ updateLogic();//process movement, detect collisions etc renderGraphics();//draw a new frame try{Thread.sleep(25);}catch(InterruptedException e){e.printStackTrace();}//sleep the thread to control the frame rate. (there are more efficient ways to sleep a thread but this is the most simplistic) } } </code></pre>
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    1. POAffineTransform doesn't move image on key presses
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    1. COWould that approach not move the image smoothly? I want a sort of "gliding" motion as long as the key is held. I'm making space invaders, so it obviously needs to move smoothly from left to right. I **think** this is why my book used `AffineTransform`
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    2. CO@imulsion AffineTransform won't provide what you're after. If you want smooth movement, you will need to use floating point numbers for movement calculations and a loop with locked timing to control the frame rate, all of which harkens back to what I was saying at the start. I'll edit my answer.
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    3. COThank you for your help :)
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