JOGL Coloring

by Online Tutorials Library July 14, 2022

JOGL Colors

In JOGL, a figure can be filled out with different type of colors. Coloring just enhances the look and feel of figure.

To specify the type of color, JOGL uses glColor3f() method of GL2 interface. This method follows RGB (Red, Green, Blue) color model. In this model, each color is represented with a value between 0 to 1 where 0 means none of that color and 1 means maximum of that color.

Note – It is required to pass the value of all three colors as a parameter of glColor3f() method.

JOGL Color Code List

Following is the list of codes for some frequently used colors :

Color	Red	Green	Blue
Red	1	0	0
Green	0	1	0
Blue	1	1	0
Yellow	1	1	0
Orange	1	0.5	0
Purple	1	0	1
Cyan	0	1	1

JOGL single coloring Example

This is a simple example where a triangle is filled out with one (green) color only.

JColor.java

  package com.tutoraspire.jogl;  import javax.media.opengl.*;  import javax.media.opengl.awt.GLCanvas;  import javax.swing.JFrame;    public class JColor 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);                      //Green Color  gl.glColor3f( 0.0f,1.0f,0.0f );   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);  JColor jc = new JColor();  gc.addGLEventListener(jc);  gc.setSize(400, 400);    final JFrame frame = new JFrame(“JOGL Coloring”);  frame.add(gc);  frame.setSize(500,400);  frame.setVisible(true);       }  }  

Output:

JOGL mixed Coloring Example

In this example, a triangle is filled out with three different colors.

JMColor.java

  package com.tutoraspire.jogl;  import javax.media.opengl.*;  import javax.media.opengl.awt.GLCanvas;  import javax.swing.JFrame;    public class JMColor 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);                    //Yellow Color  gl.glColor3f(1.0f, 1.0f, 0f);  gl.glVertex2d(0,0.5);                 //Red Color  gl.glColor3f(1f,0f,0f);   gl.glVertex2d(-0.5,-0.5);                  //Blue Color  gl.glColor3f(0f,0f,1f);   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);  JMColor jc = new JMColor();  gc.addGLEventListener(jc);  gc.setSize(400, 400);    final JFrame frame = new JFrame(“JOGL Mixed Coloring”);  frame.add(gc);  frame.setSize(500,400);  frame.setVisible(true);       }  }  

Output:

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JOGL Coloring

JOGL Colors

Note – It is required to pass the value of all three colors as a parameter of glColor3f() method.

JOGL Color Code List

JOGL single coloring Example

JOGL mixed Coloring Example

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