JOGL Primitives Shapes

by Online Tutorials Library July 14, 2022

JOGL Primitive Shapes

In the previous examples, we have already learnt that in JOGL any type of shape can be drawn with the help of GL_LINES parameter. But apart from that, JOGL also contains various other parameters through which we can draw the particular shape such as triangle, quadrilateral, polygon etc. directly (i.e. in the simpler way).

JOGL Primitive Triangle Example

In this example, we will see how to create a triangle with the help of primitive triangle parameter (GL_TRIANGLES).

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();    gl.glBegin(GL2.GL_TRIANGLES);           gl.glVertex2d(0,0.5);  gl.glVertex2d(-0.5,-0.5);  gl.glVertex2d(0.5,-0.5);    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);        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:

JOGL Primitive Shapes Triangle Output

JOGL Primitive Quadrilateral Example

In this example, we will see how to create a quadrilateral with the help of primitive quadrilateral parameter (GL_QUADS).

JQuad.java

  package com.tutoraspire.jogl;  import javax.media.opengl.*;  import javax.media.opengl.awt.GLCanvas;  import javax.swing.JFrame;    public class JQuad implements GLEventListener {    @Override  public void init(GLAutoDrawable arg0)     {      }       @Override  public void display(GLAutoDrawable drawable) {    final GL2 gl = drawable.getGL().getGL2();      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 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);  JQuad jq = new JQuad();  gc.addGLEventListener(jq);  gc.setSize(400, 400);    final JFrame frame = new JFrame(“JOGL Primitive Quadrilateral”);  frame.add(gc);  frame.setSize(500,400);  frame.setVisible(true);       }  }  

Output:

JOGL Primitive Shapes Quadrilateral Output

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