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Thread: Using a Method from another class help?

  1. #1
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    Default Using a Method from another class help?

    Hi all,
    Sorry if this is in the wrong spot, I'm brand new here and don't know much if anything about OOP Java, so i apologize if this doesn't belong here.

    Anyway, for my high-school senior project I wrote java code to generate a height map that can be rendered to make some terrain. My mentor gave me code that will render it, but I don't know how to do that, and his e-mail replies come slow, along with deadlines fast approaching. I installed the JOGL library i needed, but I don't know how to use the code he gave me in my main program.

    Here's the code he gave me...
    What do I put in my code to use this?
    Need to hear back soon, so thanks to anyone who can reply.

    -JMSV

    /**
     * TerrainRenderWindow.java
     * Copyright 2011, Craig A. Damon
     * all rights reserved
     */
    package edu.vtc.cis4210.collada;
     
    import java.awt.BorderLayout;
    import java.awt.Dimension;
    import java.awt.event.WindowAdapter;
    import java.awt.event.WindowEvent;
     
    import javax.media.opengl.GL;
    import javax.media.opengl.GL2;
    import javax.media.opengl.GLAutoDrawable;
    import javax.media.opengl.GLCapabilities;
    import javax.media.opengl.GLEventListener;
    import javax.media.opengl.awt.GLJPanel;
    import javax.media.opengl.fixedfunc.GLLightingFunc;
    import javax.media.opengl.fixedfunc.GLMatrixFunc;
    import javax.media.opengl.glu.GLU;
    import javax.swing.Box;
    import javax.swing.BoxLayout;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JPanel;
    import javax.swing.JSlider;
    import javax.swing.SwingConstants;
    import javax.swing.event.ChangeEvent;
    import javax.swing.event.ChangeListener;
     
     
    /**
     * TerrainRenderWindow - render a generic terrain
     * @author Craig A. Damon
     *
     */
    public class TerrainRenderWindow extends JFrame implements GLEventListener
    {
    	/**
    	 * 
    	 */
    	private static final long serialVersionUID = -639973996724650421L;
     
    	/**
    	 * run a test version of this
    	 * @param args
    	 * @throws Exception
    	 */
    	public static void main(String[] args) throws Exception
    	{
    		double[][] elev = new double[8][];
    		elev[0] = new double[]{ 0.0, 0.2, 0.8, 1.4, 1.8, 1.1, 0.7, 0.3 };
    		for (int i = 1; i < elev.length; i++)
    			{
    			  elev[i] = new double[]{0.3+elev[i-1][1],0.7-elev[i-1][0],1.1-elev[i-1][3]*0.5,1.4+elev[i-1][2]*0.3,
    			  												 1.3+elev[i-1][5]*0.1,0.9-elev[i-1][4]*elev[1-1][2],0.5+elev[i-1][7]*0.2,0.1+elev[i-1][6]*0.3};
    			}
    		ColorChooser colors = new ColorChooser(){
     
    			@Override
    			public float[] chooseColor(double x, double y, double z)
    			{
    				if (y > 0)
    					return new float[]{0,1,0};
    				if (y < 0.4)
    					{
    						System.out.println("Color for "+x+","+y+","+z+" is valley");
    						return new float[]{0.0f,1.0f,0.0f};
    					}
    				if (y < 1.0)
    					{
    						System.out.println("Color for "+x+","+y+","+z+" is hillside");
    						return new float[]{1.0f,0f,0f};
    					}
    				if (y < 1.7)
    					{
    						System.out.println("Color for "+x+","+y+","+z+" is mountain");
    						return new float[]{0.0f,0.0f,1.0f};
    					}
    				System.out.println("Color for "+x+","+y+","+z+" is mountaintop");
    				return new float[]{1,1,1};
    			}
     
    		};
    		new TerrainRenderWindow(elev, colors );
    	}
     
    	/**
    	 * create a render window
    	 * @param elevData the elevation at each point in the 2D grid
    	 * @param coloring the color chooser, pass null for white
    	 * @throws Exception if anything goes wrong
    	 */
      public TerrainRenderWindow(double[][] elevData,ColorChooser coloring) throws Exception
     	 {
     		 super("Render");   // set the window title
         _elevData = elevData;
         for (int i = 0; i < _elevData.length; i++)
        	 {
        		 for (int j = 0; j < _elevData[i].length; j++)
        			 {
        				 System.out.print(_elevData[i][j]);
        				 System.out.print('\t');
        			 }
        		 System.out.println();
        	 }
     
         // set the initial orientation
     		 _distance = 30;
     		 _x = 0;
     		 _y = 0;
     		 _z = 0;
     		 _scale = 1;
     
     		 // create the window elements
     		 createCanvas();
     	   getContentPane().setLayout(new BorderLayout());
     	   getContentPane().add(_canvas,BorderLayout.CENTER);
     	   getContentPane().add(new ControlPanel(),BorderLayout.SOUTH);
     
     		 GLCapabilities capabilities = new GLCapabilities(null);
         capabilities.setRedBits(8);
         capabilities.setBlueBits(8);
         capabilities.setGreenBits(8);
         capabilities.setAlphaBits(8);
     
         _drawColors = false; // coloring != null;
         _coloring = coloring;
         _drawSolid = true;
         _drawWireFrame = false;
     
         // finish up
     	   pack();
     	   addWindowListener(new WindowAdapter(){
     				@Override
     				public void windowClosing(WindowEvent e)
     				{
     	        System.exit(0);				
     				}
     	      });
     	   setVisible(true);
     	 }
     
    	/** create a drawable panel
    	 * 
    	 */
    	private void createCanvas()
    	{
    		_canvas = new GLJPanel();
    		_canvas.setPreferredSize(new Dimension(1000,1000));
    		_canvas.addGLEventListener(this);
    	}
     
    	/**
    	 * @param canvas
    	 * @see javax.media.opengl.GLEventListener#display(javax.media.opengl.GLAutoDrawable)
    	 */
    	@Override
    	public void display(GLAutoDrawable canvas)
    	{
    	  GL2 gl = (GL2) canvas.getGL();
     
        // Change back to model view matrix.
        gl.glMatrixMode(GLMatrixFunc.GL_MODELVIEW);
        gl.glLoadIdentity();
        gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
    		gl.glPushMatrix();
    		gl.glTranslatef(-_x,-_y,_z);
        gl.glRotatef(_rotx,1,0,0);
        gl.glRotatef(_roty,0,1,0);
        gl.glRotatef(_rotz,0,0,1);
        gl.glScalef(_scale,_scale,_scale);
     
     
        // display it appropriately
        if (_drawSolid)
          {
          	  if (_drawColors)
          	  	  drawColors(gl);
          	  else
          	    drawSolid(gl);
          }
        if (_drawWireFrame)
        	  drawWireFrame(gl);
     
        gl.glPopMatrix();
    	}
     
    	private void chooseColorXYZ(GL2 gl,double x,double y, double z)
    	{
    		if (_coloring == null)
    			gl.glColor3f(1,1,1);
    		else
    			{
    		    float[] color = _coloring.chooseColor(x,y,z);
    		    System.out.println("Coloring "+x+","+y+" as "+((int)color[0]*255)+","+((int)color[1]*255)+","+((int)color[2]*255));
    		    gl.glColor3f(color[0],color[1],color[2]);
    			}
    	}
     
    	private void drawWireFrame(GL2 gl)
    	{
    		 gl.glLineWidth(1);
         for (int i = 0; i < _elevData.length; i++)
        	 {    		 
    	     gl.glColor3f(1,1,1);
        		 gl.glBegin(GL.GL_LINE_STRIP);
        		 for (int j = 0; j < _elevData[i].length; j++)
        			 {
        				 gl.glVertex3d(i,_elevData[i][j],j);
        			 }
        		 gl.glEnd();
        		 if (i > 0)
        			 {
            		 for (int j = 0; j < _elevData[i].length; j++)
            			 {
            	       gl.glColor3f(1,1,1);
                		 gl.glBegin(GL.GL_LINES);
            				 gl.glVertex3d(i-1,_elevData[i-1][j],j);
           				 gl.glVertex3d(i,_elevData[i][j],j);
                		 gl.glEnd();
            			 }
        			 }
        	 }
    	}
     
    	private void drawSolid(GL2 gl)
    	{
    		 gl.glColor3f(1,1,1);
    		 float p1x,p1y,p1z;
    		 float p2x,p2y,p2z;
    		 float p3x,p3y,p3z;
    		 float nx,ny,nz;
    		 gl.glColor3f(0.0f,1.0f,0.0f);
     
         for (int i = 1; i < _elevData.length; i++)
        	 {    		 
        		 gl.glBegin(GL.GL_TRIANGLE_STRIP);
      			 p1x = i-1;
      			 p1y = (float)_elevData[i-1][0];
      			 p1z = 0;
    			 gl.glVertex3f(p1x,p1y,p1z);
    			 p2x = i;
    			 p2y = (float)_elevData[i][0];
    			 p2z = 0;
    			 gl.glVertex3f(p2x,p2y,p2z);
        		 for (int j = 1; j < _elevData[i].length; j++)
        			 {
          			 p3x = i-1;
          			 p3y = (float)_elevData[i-1][j];
          			 p3z = j;
        				 gl.glVertex3f(p3x,p3y,p3z);
     
        				 nx = (p1y-p2y)*(p3z-p2z) - (p1z-p2z)*(p3y-p2y);
        				 ny = (p1z-p2z)*(p3x-p2x) - (p1x-p2x)*(p3z-p2z);
        				 nz = (p1x-p2x)*(p3y-p2y) - (p1y-p1y)*(p3x-p2x);
        				 gl.glNormal3f(nx,ny,nz);
     
        				 p1x = p2x; p1y = p2y; p1z = p2z;
        				 p2x = p3x; p2y = p3y; p2z = p3z;
     
     
          			 p3x = i;
          			 p3y = (float)_elevData[i][j];
          			 p3z = j;
        				 gl.glVertex3f(p3x,p3y,p3z);
     
        				 nx = (p2y-p1y)*(p3z-p1z) - (p2z-p1z)*(p3y-p1y);
        				 ny = (p2z-p1z)*(p3x-p1x) - (p2x-p1x)*(p3z-p1z);
        				 nz = (p2x-p1x)*(p3y-p1y) - (p2y-p1y)*(p3x-p1x);
        				 gl.glNormal3f(nx,ny,nz);
     
        				 p1x = p2x; p1y = p2y; p1z = p2z;
        				 p2x = p3x; p2y = p3y; p2z = p3z;
        			 }
        		 gl.glEnd();
        	 }
    	}
     
    	private void drawColors(GL2 gl)
    	{
    		 float p1x,p1y,p1z;
    		 float p2x,p2y,p2z;
    		 float p3x,p3y,p3z;
    		 float nx,ny,nz;
    		 gl.glShadeModel(GLLightingFunc.GL_SMOOTH);
     
         for (int i = 1; i < _elevData.length; i++)
        	 {    		 
        		 gl.glBegin(GL.GL_TRIANGLE_STRIP);
     
      			 p1x = i-1;
      			 p1y = (float)_elevData[i-1][0];
      			 p1z = 0;
        		 chooseColorXYZ(gl,p1x,p1y,p1z);
    			 gl.glVertex3f(p1x,p1y,p1z);
    			 p2x = i;
    			 p2y = (float)_elevData[i][0];
    			 p2z = 0;
      		   chooseColorXYZ(gl,p2x,p2y,p2z);
    			 gl.glVertex3f(p2x,p2y,p2z);
        		 for (int j = 1; j < _elevData[i].length; j++)
        			 {
          			 p3x = i-1;
          			 p3y = (float)_elevData[i-1][j];
          			 p3z = j;
          		   chooseColorXYZ(gl,p3x,p3y,p3z);
        				 gl.glVertex3f(p3x,p3y,p3z);
     
        				 nx = (p1y-p2y)*(p3z-p2z) - (p1z-p2z)*(p3y-p2y);
        				 ny = (p1z-p2z)*(p3x-p2x) - (p1x-p2x)*(p3z-p2z);
        				 nz = (p1x-p2x)*(p3y-p2y) - (p1y-p1y)*(p3x-p2x);
        				 gl.glNormal3f(nx,ny,nz);
     
        				 p1x = p2x; p1y = p2y; p1z = p2z;
        				 p2x = p3x; p2y = p3y; p2z = p3z;
     
     
          			 p3x = i;
          			 p3y = (float)_elevData[i][j];
          			 p3z = j;
          		   chooseColorXYZ(gl,p3x,p3y,p3z);
        				 gl.glVertex3f(p3x,p3y,p3z);
     
        				 nx = (p2y-p1y)*(p3z-p1z) - (p2z-p1z)*(p3y-p1y);
        				 ny = (p2z-p1z)*(p3x-p1x) - (p2x-p1x)*(p3z-p1z);
        				 nz = (p2x-p1x)*(p3y-p1y) - (p2y-p1y)*(p3x-p1x);
        				 gl.glNormal3f(nx,ny,nz);
     
        				 p1x = p2x; p1y = p2y; p1z = p2z;
        				 p2x = p3x; p2y = p3y; p2z = p3z;
        			 }
        		 gl.glEnd();
        	 }
    	}
     
    	/**
    	 * @param arg0
    	 * @see javax.media.opengl.GLEventListener#dispose(javax.media.opengl.GLAutoDrawable)
    	 */
    	@Override
    	public void dispose(GLAutoDrawable canvas)
    	{
    		// nothing to do here
    	}
     
    	/**
    	 * @param arg0
    	 * @see javax.media.opengl.GLEventListener#init(javax.media.opengl.GLAutoDrawable)
    	 */
    	@Override
    	public void init(GLAutoDrawable canvas)
    	{
    		GL2 gl = (GL2) _canvas.getGL();
        gl.glEnable(GL.GL_DEPTH_TEST);
        gl.glDepthFunc(GL.GL_LEQUAL);
    	  GLU glu = new GLU();
        gl.glMatrixMode(GLMatrixFunc.GL_PROJECTION);
        gl.glLoadIdentity();
     
        // Perspective.
        float widthHeightRatio = (float) getWidth() / (float) getHeight();
        glu.gluPerspective(45, widthHeightRatio, 1, 2000);
        glu.gluLookAt(0, 0, _distance, 0, 0, 0, 0, 1, 0);
     
        // lighting
    		float[] light_pos = new float[]{0,1000,1000,1};
    		float[] diffuse_color = new float[]{1.0f,1.0f,0.8f,1.0f};
    		float[] ambient_color = new float[]{0.5f,0.5f,0.5f,1.0f};
    	  gl.glEnable(GL2.GL_LIGHTING);
    		gl.glEnable(GL2.GL_LIGHT0);
    	  gl.glLightfv(GL2.GL_LIGHT0, GL2.GL_POSITION, light_pos,0);
    	  gl.glLightfv(GL2.GL_LIGHT0,GL2.GL_DIFFUSE, diffuse_color,0);
    	  gl.glLightfv(GL2.GL_LIGHT0,GL2.GL_AMBIENT, ambient_color,0);
        gl.glColorMaterial(GL2.GL_FRONT_AND_BACK,GL2.GL_AMBIENT_AND_DIFFUSE);
    	}
     
    	/**
    	 * @param arg0
    	 * @param arg1
    	 * @param arg2
    	 * @param arg3
    	 * @param arg4
    	 * @see javax.media.opengl.GLEventListener#reshape(javax.media.opengl.GLAutoDrawable, int, int, int, int)
    	 */
    	@Override
    	public void reshape(GLAutoDrawable canvas, int arg1, int arg2, int arg3,
    			int arg4)
    	{
    		// TODO Auto-generated method stub
     
    	}
     
    	private ColorChooser _coloring;
    	private boolean _drawSolid;
    	private boolean _drawColors;
    	private boolean _drawWireFrame;
      private GLJPanel _canvas;
      private double _distance;
      private float _x;
      private float _y;
      private float _z;
      private float _rotx;
      private float _roty;
      private float _rotz;
      private float _scale;
      private double[][] _elevData;
     
      private class ControlPanel extends JPanel
      {
      	  /**
    		 * 
    		 */
    		private static final long serialVersionUID = -7606307784007999393L;
     
    			public ControlPanel()
      	  {
      	  	  setLayout(new BoxLayout(this,BoxLayout.X_AXIS));
      	  	  add(Box.createHorizontalStrut(5));
      	  	  add(Box.createHorizontalGlue());
      	  	  add(new JLabel("Size:"));
      	  	  add(Box.createHorizontalStrut(5));
      	  	  JSlider slider = new JSlider(SwingConstants.HORIZONTAL,0,100,50);
      	  	  slider.setPaintLabels(false);
      	  	  slider.addChangeListener(new ChangeListener()
      	  	  {
    						@Override
    						public void stateChanged(ChangeEvent e)
    						{
    							_scale = (float)Math.pow(10,(((JSlider)e.getSource()).getValue()-50)/20.0);
    							_canvas.repaint();
    						}
     
      	  	  });
      	  	  add(slider);
      	  	  add(Box.createHorizontalGlue());
      	  	  add(Box.createHorizontalStrut(5));
      	  	  add(Box.createHorizontalGlue());
      	  	  add(new JLabel("Rotate X:"));
      	  	  add(Box.createHorizontalStrut(5));
      	  	  slider = new JSlider(SwingConstants.VERTICAL,-180,180,0);
      	  	  slider.setPaintLabels(false);
      	  	  slider.addChangeListener(new ChangeListener()
      	  	  {
    						@Override
    						public void stateChanged(ChangeEvent e)
    						{
    							_rotx = (float)((JSlider)e.getSource()).getValue();
    							_canvas.repaint();
    						}
     
      	  	  });
      	  	  add(slider);
      	  	  add(Box.createHorizontalGlue());
      	  	  add(Box.createHorizontalStrut(5));
      	  	  add(Box.createHorizontalGlue());
       	  	  add(new JLabel("Rotate Y:"));
      	  	  add(Box.createHorizontalStrut(5));
      	  	  slider = new JSlider(SwingConstants.HORIZONTAL,-180,180,0);
      	  	  slider.setPaintLabels(false);
      	  	  slider.addChangeListener(new ChangeListener()
      	  	  {
    						@Override
    						public void stateChanged(ChangeEvent e)
    						{
    							_roty = (float)((JSlider)e.getSource()).getValue();
    							_canvas.repaint();
    						}
     
      	  	  });
      	  	  add(slider);
      	  	  add(Box.createHorizontalGlue());
      	  	  add(Box.createHorizontalStrut(5));
      	  	  add(Box.createHorizontalGlue());
       	  	  add(new JLabel("Rotate Z:"));
      	  	  add(Box.createHorizontalStrut(5));
      	  	  slider = new JSlider(SwingConstants.VERTICAL,-180,180,0);
      	  	  slider.setPaintLabels(false);
      	  	  slider.addChangeListener(new ChangeListener()
      	  	  {
    						@Override
    						public void stateChanged(ChangeEvent e)
    						{
    							_rotz = (float)((JSlider)e.getSource()).getValue();
    							_canvas.repaint();
    						}
     
      	  	  });
      	  	  add(slider);
      	  	  add(Box.createHorizontalGlue());
      	  	  add(Box.createHorizontalStrut(5));
      	  }
      }
     
      public static interface ColorChooser
      {
      	   /**
      	    * choose a color based on x,y,z
      	    * @param x
      	    * @param y
      	    * @param z
      	    * @return an array of 3 floats (R,G,B)
      	    */
      	   public float[] chooseColor(double x,double y,double z);
      }
    }
    Last edited by jmskoda5; May 10th, 2012 at 12:18 PM.


  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: Using a Method from another class help?

    See what he does in the main method by creating a new TerrainRenderWindow? That's presumably what you would want to do, although you'd want to pass your own arguments in.
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  3. #3
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    Default Re: Using a Method from another class help?

    How do i use this in another program though? I've tried using...
    TerrainRenderWindow.class.getMethod("TerrainRenderWindow",

    But I don't know how to format the parameters and everywhere that explains it that I've looked, I don't understand.

  4. #4
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    Default Re: Using a Method from another class help?

    ...huh? What do you expect that to do? You're making it way more complicated than it should be.

    Step one is to put the .java file into the proper folders for the packages it's in.
    Step two is to compile that .java file into a .class file.
    Step three is to import that class into your own class (using an import statement and presumably the classpath).
    Step four is to use that class from your class.

    Take those steps one at a time instead of trying to skip to the final step.
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    Default Re: Using a Method from another class help?

    Create a new TerrainRenderWindow in your other program using the Constructor.
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    Default Re: Using a Method from another class help?

    @KevinWorkman
    -I didn't have to import another class that i used I just typed Classname.methodname(parameters); but I can't do that with this one. So, I don't know if that means i still have to import it, I don't know how to import classes, or what a classpath is.

    @aussiemcgr
    -What constructor? I thought I had to give the code I show here the parameters for the "TerrainRenderWindow" method, then it runs with that?

  7. #7
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    Default Re: Using a Method from another class help?

    Quote Originally Posted by jmskoda5 View Post
    @KevinWorkman
    -I didn't have to import another class that i used I just typed Classname.methodname(parameters); but I can't do that with this one. So, I don't know if that means i still have to import it, I don't know how to import classes, or what a classpath is.
    I'm not sure what you're trying to say, and I don't know a better way to put it than "you're doing it wrong." You shouldn't be using Classname.methodname or anything like that. You should be simply importing the class and using it directly. Note that the class would still have to be on your classpath for you to use Classname.whatever.

    As for not knowing how to import or what a classpath is, that's what google and the basic tutorials are for. We are happy to help, but repeating what the basic tutorials say seems pointless for everybody.

    Quote Originally Posted by jmskoda5 View Post
    @aussiemcgr
    -What constructor? I thought I had to give the code I show here the parameters for the "TerrainRenderWindow" method, then it runs with that?
    The basic tutorials go over what a constructor is, and how to call one. I suggest you start at the beginning: The Java™ Tutorials
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    Default Re: Using a Method from another class help?

    The first method (after the main) is the constructor. It says: public TerrainRenderWindow(double[][] elevData,ColorChooser coloring) throws Exception

    You create a new TerrainRenderWindow object by calling the constructor and passing it a 2-dimensional double array and a ColorChooser Object. The last line of your main is an example of constructing a new TerrainRenderWindow, where it says: new TerrainRenderWindow(elev, colors );
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