Problems with KEYListener,

OpenGL Development JOGL Development
#1

Hello I´m very new to jogel
i´ve tried to move an geometric objekt with Pressed Keys, but it does not work. That´s what i´ve done:

import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import net.java.games.jogl.*;
//import net.java.games.jogl.util.GLUT;

public class MoveTest_view implements GLEventListener, KeyListener
{

public static float x=0;
public void init(GLDrawable drawable)
{
	GL gl = drawable.getGL();
	gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

	gl.glMatrixMode(GL.GL_PROJECTION);
	gl.glLoadIdentity();
	gl.glFrustum(-5, 5, -5, 5, 2, 12.0);
	gl.glMatrixMode(GL.GL_MODELVIEW);
	
	drawable.addKeyListener(this);
	
	gl.glLoadIdentity();
}

public void display(GLDrawable drawable)
{	
	GL gl = drawable.getGL();
		
	gl.glClear(GL.GL_COLOR_BUFFER_BIT);
	
	gl.glTranslatef (x, 0, 0);
	
	gl.glPushMatrix();
	gl.glTranslatef (0.0f, 0.0f, -3.0f);		
	gl.glBegin(GL.GL_POLYGON);
		gl.glVertex3f(-0.5f, 0.35f, 0.0f); // links unten (x,y,z) koordinate
		gl.glVertex3f(0.5f, 0.35f, 0.0f);
		gl.glVertex3f(0.0f, 1.4f, 0.0f);
	gl.glEnd();
	gl.glPopMatrix();
}

public void reshape(GLDrawable drawable, int x, int y, int width, int height)
{}

public void displayChanged(GLDrawable drawable, boolean modeChanged, boolean deviceChanged)
{}

public void keyTyped(KeyEvent arg0) {}

public void keyPressed(KeyEvent arg0) 
{
	switch(arg0.getKeyCode())
	{
	case KeyEvent.VK_LEFT:  x=x-0.1f     ; break;
	case KeyEvent.VK_RIGHT: x=x+0.1f     ; break;
	}
}
public void keyReleased(KeyEvent arg0) {}

}

Can someone tell me where my problem is?
Does Someone here knows a GOOD jogl Tutorial (somthing like NEHE´s but for Java).
Thank You

#2

You probably need a call to repaint() in your keyPressed() method.

#3

I´ve used the animater. I thought the animater recalls the display methode the whole time.
Thank you.

#4

oh god, i got it,
i don´t know why , but you have to klick into the window with the triangle, befor you use the keys, the code is correct.

#5

BTW, there’s a link to Pepijn Van Eeckhoudt’s NeHe ports to JOGL and other tutorials on the jogl-demos page.

#6

But why do you have to click into the window before the application reacts on key-events ?
I had the same problem some time ago…

thx

#7

Your canvas doesn’t have the “input focus.” You can get the canvas “the focus” bycalling Component.requestFocusInWindow(). Link to all you ever wanted to know about focus.