本章教您如何使用JOGL将颜色应用于对象.要将颜色应用于对象，请使用 GL2 的方法 glColor().下面给出了使用glColor方法的语法.
语法
gl.glColorXY(1f，0f ，0F);
其中，
X表示数字使用的颜色，3(红色，绿色，蓝色)或4(红色，绿色，蓝色，alpha).要获得各种颜色组合，这些颜色的值将作为参数传递.必须按顺序维护颜色参数的顺序.
示例
如果将颜色值传递为( 1,0,0)，然后你得到红色.类似地，(1,1,0)给你黄色.
Y表示接受诸如字节(b)，double(d)等参数的数据类型)，float(f)，int(i)，short(s)，ubyte(ub)，uint(ui)和ushort(us).
gl.glColor3f(1f,0f,0f); //gives us red gl.glColor3f(0f,1f,0f); //gives us green gl.glColor3f(0f,0f,1f); //gives us blue
如果是三角形，你可以为每个顶点应用不同的颜色.
让我们通过程序将颜色应用于三角形 :
import javax.media.opengl.GL2; import javax.media.opengl.GLAutoDrawable; import javax.media.opengl.GLCapabilities; import javax.media.opengl.GLEventListener; import javax.media.opengl.GLProfile; import javax.media.opengl.awt.GLCanvas; import javax.swing.JFrame; public class TriangleColor implements GLEventListener { @Override public void display( GLAutoDrawable drawable ) { final GL2 gl = drawable.getGL().getGL2(); gl.glBegin( GL2.GL_TRIANGLES ); // Drawing Using Triangles gl.glColor3f( 1.0f, 0.0f, 0.0f ); // Red gl.glVertex3f( 0.5f,0.7f,0.0f ); // Top gl.glColor3f( 0.0f,1.0f,0.0f ); // green gl.glVertex3f( -0.2f,-0.50f,0.0f ); // Bottom Left gl.glColor3f( 0.0f,0.0f,1.0f ); // blue gl.glVertex3f( 0.5f,-0.5f,0.0f ); // Bottom Right gl.glEnd(); } @Override public void dispose( GLAutoDrawable arg0 ) { //method body } @Override public void init( GLAutoDrawable arg0 ) { // method body } @Override public void reshape( GLAutoDrawable arg0, int arg1, int arg2, int arg3, int arg4 ) { // method body } public static void main( String[] args ) { //getting the capabilities object of GL2 profile final GLProfile profile = GLProfile.get( GLProfile.GL2 ); GLCapabilities capabilities = new GLCapabilities(profile); // The canvas final GLCanvas glcanvas = new GLCanvas( capabilities ); TriangleColor triangle = new TriangleColor(); glcanvas.addGLEventListener( triangle ); glcanvas.setSize( 400, 400 ); //creating frame final JFrame frame = new JFrame (" Colored Triangle"); //adding canvas to it frame.getContentPane().add( glcanvas ); frame.setSize( frame.getContentPane().getPreferredSize()); frame.setVisible( true ); } //end of main} //end of class编译时执行上面的程序，你得到以下彩色三角形和减号;
将颜色应用于多边形
让我们通过程序将颜色应用于多边形 :
import javax.media.opengl.GL2; import javax.media.opengl.GLAutoDrawable; import javax.media.opengl.GLCapabilities; import javax.media.opengl.GLEventListener; import javax.media.opengl.GLProfile; import javax.media.opengl.awt.GLCanvas; import javax.swing.JFrame; public class PolygonColor implements GLEventListener { @Override public void display( GLAutoDrawable drawable ) { final GL2 gl = drawable.getGL().getGL2(); gl.glColor3f( 1f,0f,0f ); //applying red gl.glBegin( GL2.GL_POLYGON ); gl.glVertex3f( 0f,0.5f,0f ); gl.glVertex3f( -0.5f,0.2f,0f ); gl.glVertex3f( -0.5f,-0.2f,0f ); gl.glVertex3f( 0f,-0.5f,0f ); gl.glVertex3f( 0f,0.5f,0f ); gl.glVertex3f( 0.5f,0.2f,0f ); gl.glVertex3f( 0.5f,-0.2f,0f ); gl.glVertex3f( 0f,-0.5f,0f ); gl.glEnd(); } @Override public void dispose( GLAutoDrawable arg0 ) { //method body } @Override public void init( GLAutoDrawable arg0 ) { // method body } @Override public void reshape( GLAutoDrawable arg0, int arg1, int arg2, int arg3, int arg4 ) { // method body } public static void main( String[] args ) { //getting the capabilities object of GL2 profile final GLProfile profile = GLProfile.get( GLProfile.GL2 ); GLCapabilities capabilities = new GLCapabilities(profile); // The canvas final GLCanvas glcanvas = new GLCanvas( capabilities ); PolygonColor polygon = new PolygonColor(); glcanvas.addGLEventListener( polygon ); glcanvas.setSize( 400, 400 ); //creating frame final JFrame frame = new JFrame ( "Colored Polygon" ); //adding canvas to frame frame.getContentPane().add( glcanvas ); frame.setSize(frame.getContentPane().getPreferredSize() ); frame.setVisible( true ); } //end of main } //end of class编译时执行上面的程序，你得到以下彩色的Polygon :
