JOGL 2D Objects

by Online Tutorials Library July 14, 2022

JOGL 2D Objects

In the previous section, we have already learn how to draw a basic line in JOGL. Using the same methods we can also draw various type of shapes such as square, rectangle, triangle etc.

JOGL Square Example

In this example, we will draw four different edges in such a way that they all connect at a point in a shape of square.

  package com.tutoraspire.jogl;  import javax.media.opengl.*;  import javax.media.opengl.awt.GLCanvas;  import javax.swing.JFrame;    public class Square implements GLEventListener {    @Override  public void init(GLAutoDrawable arg0)     {      }       @Override  public void display(GLAutoDrawable drawable) {  final GL2 gl = drawable.getGL().getGL2();          //Drawing top edge  gl.glBegin( GL2.GL_LINES );  gl.glVertex2d(-0.4, 0.4);  gl.glVertex2d(0.4, 0.4);  gl.glEnd();    //Drawing bottom edge  gl.glBegin( GL2.GL_LINES );  gl.glVertex2d(-0.4,-0.4);  gl.glVertex2d(0.4, -0.4);  gl.glEnd();          //Drawing right edge  gl.glBegin( GL2.GL_LINES );  gl.glVertex2d(-0.4, 0.4);  gl.glVertex2d(-0.4, -0.4);  gl.glEnd();          //Drawing left edge  gl.glBegin( GL2.GL_LINES );  gl.glVertex2d(0.4, 0.4);  gl.glVertex2d(0.4, -0.4);  gl.glEnd();     }           @Override  public void reshape(GLAutoDrawable arg0, int arg1, int arg2, int arg3, int arg4)      {       }     @Override  public void dispose(GLAutoDrawable arg0)      {       }    public static void main(String[] args) {    final GLProfile gp = GLProfile.get(GLProfile.GL2);  GLCapabilities cap = new GLCapabilities(gp);    final GLCanvas gc = new GLCanvas(cap);        Square sq = new Square();  gc.addGLEventListener(sq);  gc.setSize(400, 400);    final JFrame frame = new JFrame(“JOGL Line”);  frame.add(gc);  frame.setSize(500,400);  frame.setVisible(true);       }  }  

Output:

JOGL Triangle Example

In this example, we will draw three different edges in such a way that they all connect at a point in a shape of triangle.

Triangle.java

  package com.tutoraspire.jogl;  import javax.media.opengl.*;  import javax.media.opengl.awt.GLCanvas;  import javax.swing.JFrame;    public class Triangle implements GLEventListener {    @Override  public void init(GLAutoDrawable arg0)     {      }       @Override  public void display(GLAutoDrawable drawable) {  final GL2 gl = drawable.getGL().getGL2();          // Base edge  gl.glBegin (GL2.GL_LINES);  gl.glVertex2d(-0.65, -0.65);  gl.glVertex2d(0.65, -0.65);  gl.glEnd();          //Right edge  gl.glBegin (GL2.GL_LINES);  gl.glVertex2d(0, 0.65);  gl.glVertex2d(-0.65, -0.65);  gl.glEnd();          //Left edge  gl.glBegin (GL2.GL_LINES);  gl.glVertex2d(0, 0.65);  gl.glVertex2d(0.65, -0.65);  gl.glEnd();  gl.glFlush();     }           @Override  public void reshape(GLAutoDrawable arg0, int arg1, int arg2, int arg3, int arg4)      {       }     @Override  public void dispose(GLAutoDrawable arg0)      {       }    public static void main(String[] args) {    final GLProfile gp = GLProfile.get(GLProfile.GL2);  GLCapabilities cap = new GLCapabilities(gp);    final GLCanvas gc = new GLCanvas(cap);        Triangle tr= new Triangle();  gc.addGLEventListener(tr);  gc.setSize(400, 400);    final JFrame frame = new JFrame(“JOGL Triangle”);  frame.add(gc);  frame.setSize(500,400);  frame.setVisible(true);       }  }  

Output:

Hence, any type of figure can be designed by just connecting the lines in the particular shape.

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