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Thread: How To Make Pong Ball Slowly Increase Speed

  1. #1
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    Default How To Make Pong Ball Slowly Increase Speed

    I was making a pong game, part copied code off the internet, part my own code, part my friends code. It works well enough, but the ball starts at one speed, and stays the same. I would like to know how to make the ball slowly increase.

    It is a java applet, which shouldn't casue any harm right?

    I am quite newish to programming and i dont know the technigal jargon, so please try to give me an answer in laymans terms or just fix the code period.

    My code:
        /**
     * Pong Applet
     * Coded by Jordan
     */
     
    import java.applet.*;
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
     
    public class Pong extends Applet implements MouseMotionListener, KeyListener {
     
    	/**
    	 * 
    	 */
    	private static final long serialVersionUID = 1L;
    	int my,bx,by,px,py,xcomp,ycomp,width,height,xspeed,yspeed,ballwidth,ballheight,paddlewidth,paddleheight,score;
    	boolean started;
    	private Timer timer1;
     
    	public void init() {
    		setSize(1280,800);
    		width = getSize().width;
    		height = getSize().height;
    		setBackground(Color.white);
    		paddleheight = 120;
    		paddlewidth = 20;
    		ballheight = 30;
    		ballwidth = 30;
    		addKeyListener(this);
    		addMouseMotionListener(this);
    		px = 35;
    		xcomp = width - 35 - paddlewidth;
    		newgame();
    		timer1 = new Timer(10,new ActionListener() {
        		public void actionPerformed(ActionEvent e) {
        			height = getSize().height;
        			width = getSize().width;
    				bx += xspeed;
    				by += yspeed;
    				if (by <= 0 || by + ballheight >= height) {
    					yspeed = -yspeed;
    				}
    				if (bx <= px + paddlewidth && by + ballheight >= py && by <= py + paddleheight && bx > px) {
    					xspeed = -xspeed;
    					++score;
    				}
    				if (bx + ballwidth >= xcomp && by + ballheight >= ycomp && by <= ycomp + paddleheight && bx < xcomp + paddlewidth) {
    					xspeed = -xspeed;
    				}
    				if (xspeed < 0) {
    					if (ycomp + paddleheight / 2 != height / 2) {
    						if (ycomp + paddleheight / 2 > height / 2) {
    							ycomp -= -xspeed;
    						}
    						else {
    							ycomp += -xspeed;
    						}
    					}
    				}
    				else {
    					if (by + ballheight / 2 <= ycomp + paddleheight / 2) {
    						ycomp -= xspeed;
    					}
    					else {
    						ycomp += xspeed;
    					}
    				}
    				if (ycomp < 0) {
    					ycomp = 0;
    				}
    				if (ycomp + paddleheight > height) {
    					ycomp = height - paddleheight;
    				}
    				if (bx + ballwidth < 0) {
    					py = height / 2 - paddleheight / 2;
    					timer1.stop();
    					started = false;
    				}
    				repaint();
        		}    
    		});
    	}
     
    	public void mouseMoved(MouseEvent e) {
    		if (started) {
    			my = e.getY();
    			if (my + paddleheight / 2 > height) {
    				my = height - paddleheight / 2;
    			}
    			if (my < paddleheight / 2) {
    				my = paddleheight / 2;
    			}
    			py = my - paddleheight / 2;
     
    		}
    	}
     
    	public void mouseDragged(MouseEvent e) { }
     
    	public void paint(Graphics g) {
    		Font font1 = new Font("Arial", Font.BOLD, 18);
    		Font font2 = new Font("Arial", Font.BOLD,70);
    		g.setColor(Color.black);
    		g.drawRect(0,0,width - 1,height - 1);
    		g.setColor(Color.gray);
    		g.fillRect(px,py,paddlewidth,paddleheight);
    		g.fillRect(xcomp,ycomp,paddlewidth,paddleheight);
    		g.setFont(font1);
    		g.setColor(Color.black);
    		g.drawString("Points: " + score,20,20);
    		if (started) {
    			g.fillArc(bx,by,ballwidth,ballheight,0,360);
    		}
    		else {
    			g.setFont(font2);
    			g.setColor(Color.blue);
    			g.drawString("Pong",width / 2 - 76,height / 2 - 16);
    			g.setFont(font1);
    			g.setColor(Color.cyan);
    			g.drawString("Use The Mouse To Control The Paddle",width / 2 - 145,height / 2 + 30);
    			g.drawString("Press 'Space' To Start",width / 2 - 85,height / 2 + 50);
    		}
    	}
     
    	public void newgame() {
    		py = height / 2 - paddleheight / 2;
    		ycomp = py;
    		bx = width / 2 - ballwidth / 2;
    		by = height / 2 - ballheight / 2;
    		xspeed = 14;
    		yspeed = 14;
    		score = 0;
    	}
     
    	public void keyPressed(KeyEvent e) {
    		if (e.getKeyChar() == ' ') {
    			started = true;
    			newgame();
    			timer1.start();
    		}
    	}
     
    	public void keyTyped(KeyEvent e) { }
     
    	public void keyReleased(KeyEvent e) { }
     
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: How To Make Pong Ball Slowly Increase Speed

    how to make the ball slowly increase.
    Increase the distance the ball moves each time interval slowly.
    If the ball is moving 2 units/time unit, change it to move 3 units/time unit then 4 etc
    Make the changes slowly, say every x time units. Experiment to see what gives the effect you want.
    If you don't understand my answer, don't ignore it, ask a question.

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