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 Rotating a shape  (Read 1468 times) 0 Members and 1 Guest are viewing this topic.

Junior Newbie

 « Posted 2011-07-17 07:32:49 »

Hi,
I have a problem what I'm trying to do is make my fillRect() Rotate constantly as it moves around a point
What i mean by this is, I have wrote the trigonometry so the fillRect() moves around a point constantly and then what I am trying to do is make the shape rotate as it goes around the point any help would be apprecited

 1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56  57  58  59  60  61  62  63  64  65  66  67  68  69  70  71  72  73  74  75  76  77  78  79  80  81  82  83  84  85  86 import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.*;/** * * @author Administrator */public class PhysicGUI extends JFrame{        private Trigonometry trig;    private MoveAnim move;    private Timer timer;    private int x;    private int y;            private double hypotenese;    private double cosine;    private double sine;    private double counter;    private int radianCounter;    public PhysicGUI()    {        super();        setSize( 500, 500 );        setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );        trig = new Trigonometry();        move = new MoveAnim();        timer = new Timer( 500, move );        x = 250;        y = 250;        hypotenese = 60;        sine = 0;        cosine = 0;        counter = 0;        radianCounter = 0;        timer.start();    }    public void paint( Graphics g )    {        super.paint( g );             Graphics2D g2d = ( Graphics2D )g;        g2d.translate( 15, 15 );        g2d.rotate( radianCounter++, x , y  );        g2d.fillRect( x + ( int )trig.getCosine() ,                    y + ( int )trig.getSine(), 30, 30 );    }    public void move()    {        double radian =  Math.toRadians( counter );        cosine = Math.cos( radian ) * hypotenese;        sine = Math.sin( radian ) * hypotenese;        counter = counter + 30;        if( counter > 360 )        {            counter = 0;        }    }        public class MoveAnim implements ActionListener    {        public void actionPerformed(ActionEvent e)        {            repaint();            move();        }    }    public static void main( String[]args )    {        PhysicGUI gui = new PhysicGUI();        gui.setVisible( true );            }}
ra4king

JGO Kernel

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 « Reply #1 - Posted 2011-07-17 07:53:18 »

Why are you translating by (15,15) before the call to rotate?
I assume the position of the point is (250,250)?

Junior Newbie

 « Reply #2 - Posted 2011-07-17 08:13:07 »

Hi,
Yes the x , y are 250 I was just kinda using stuff I found on the internet I don't think translate should even be used?
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ra4king

JGO Kernel

Medals: 471
Projects: 3
Exp: 5 years

I'm the King!

 « Reply #3 - Posted 2011-07-17 09:24:56 »

Well the call to rotate already translates for you.
From the javadocs, rotate(theta,x,y) is the same as doing:
translate(x,y);
rotate(theta);
translate(-x,-y);

Sinuath

Junior Devvie

Medals: 2

 « Reply #4 - Posted 2011-07-17 10:08:58 »

affine transformations?

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