JOGL Scaling

In JOGL, Scaling is used to either increase or decrease the size of an object. It manipulates the physical dimensions of an object. Thus, through scaling an object can be stretched or shrink from any of its axis.

To scale an object the following syntax is used:

Here, glScalef() method is provided by GLMatrixFunc interface with the parameters that represents the dimensions.

JOGL Scaling Example

In this example, we will diminished the dimensions of polygon.

package com.javatpoint.jogl;

	import javax.media.opengl.*;
	import javax.media.opengl.awt.GLCanvas; 

	import javax.swing.JFrame;
	
	public class JScaling implements GLEventListener {
	
	   @Override 
		
	public void display( GLAutoDrawable drawable ) { 
	
	final GL2 gl = drawable.getGL().getGL2(); 
	
	gl.glScalef( 0.40f,0.30f,0.40f ); 
	
		gl.glBegin(GL2.GL_QUADS);
		
		gl.glVertex3f( 0.0f,0.5f,0);
		gl.glVertex3f(-0.5f,0f,0);
		gl.glVertex3f(0f,-0.5f,0);
		gl.glVertex3f(0.5f,0f,0);
		
		gl.glEnd();

	   }
	
	   @Override 
	public void dispose( GLAutoDrawable arg0 ) { 
	   } 
	
	   @Override 
	public void init( GLAutoDrawable arg0 ) { 
	   } 
	
	   @Override 
	public void reshape( GLAutoDrawable arg0, int arg1, int arg2, int arg3, int arg4 ) { 
	   }
	
	public static void main( String[] args ) {   
	
		final GLProfile gp = GLProfile.get(GLProfile.GL2);
		GLCapabilities cap = new GLCapabilities(gp);
		
		final GLCanvas gc = new GLCanvas(cap);
		JScaling js= new JScaling();
		gc.addGLEventListener(js);
		gc.setSize(400, 400);
		
		final JFrame frame = new JFrame("After Scaling");
		frame.add(gc);
		frame.setSize(500,400);
		frame.setVisible(true);  
	   } 
		
	}

Output:

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