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POCreating a "bullet" class (Java/swing)
 

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  1. POCreating a "bullet" class (Java/swing)
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    <p>I'm trying to create a Tower Defense style game, where the object is to stop the attacking forces from reaching their target. This is done by building towers, which attacks the waves of enemies with different kinds of attacks. As I am new to programming, I was hoping for some help with creating my bullet's SetBulletLocation method.</p> <p>I've been trying to copy: <a href="https://stackoverflow.com/questions/11574341/move-object-along-a-straight-line">this example</a>, <strong>but I can't make my bullet move smoothly towards the target location</strong></p> <pre><code>public class Bullets extends JComponent{ //x,y = the towers coordinates, where the shoot initiliazes from. //tx, ty = Target's x and y coordinates. private int x,y,tx,ty; private Point objectP = new Point(); public Bullets(int x, int y, int tx, int ty) this.x = x; this.y = y; this.tx = tx; this.ty = ty; setBounds(x,y,50,50); //Create actionlistener to updateposition of the bullet (setLocation of component) ActionListener animate = new ActionListener() { @Override public void actionPerformed(ActionEvent ae) { setBulletLocation(); } }; Timer t = new Timer(500,animate); t.start(); } public void setBulletLocation() { objectP = this.getLocation(); double xDirection = 5* Math.cos(-(Math.atan2(tx - x, tx - y))+ 90); double yDirection = 5* Math.sin(-(Math.atan2(tx - x, tx - y))+ 90); System.out.println(xDirection + " , " + yDirection); x = (objectP.x + (int) xDirection); y = (objectP.y + (int) yDirection); setLocation(x, y); repaint(); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); g.fillOval(0, 0, 50, 50); } </code></pre>
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    1. USJesper Tuborg Madsen
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    1. COWhere in your code is the 500ms (or is it ns) applied to move the bullet?
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      1. USRichard Tingle
    2. COAll of the objects in your game should be GUI models. You should have one JPanel that you use as a canvas. That one JPanel draws all of the game objects to create one frame of animation.
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      1. USGilbert Le Blanc
 

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