Jogl-3d-basics
提供：Dev Guides
JOGL-3Dの基本
前の章では、2Dオブジェクトを作成し、エフェクトを適用し、オブジェクトを変換する方法を見てきました。 この章では、3次元の線といくつかの形状を描く方法について説明します。
z軸で簡単な線を描き、2Dと3Dの線の違いを見てみましょう。 最初に単純な線を引き、次にウィンドウに3単位で2番目の線を引きます。
私たちは3Dラインを描くためにプログラムを見てみましょう-
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.media.opengl.glu.GLU;
import javax.swing.JFrame;
public class Line3d implements GLEventListener {
private GLU glu = new GLU();
@Override
public void display( GLAutoDrawable drawable ) {
final GL2 gl = drawable.getGL().getGL2();
gl.glTranslatef( 0f, 0f, -2.5f );
gl.glBegin( GL2.GL_LINES );
gl.glVertex3f( -0.75f,0f,0 );
gl.glVertex3f( 0f,-0.75f, 0 );
gl.glEnd();
//3d line
gl.glBegin( GL2.GL_LINES );
gl.glVertex3f( -0.75f,0f,3f );//3 units into the window
gl.glVertex3f( 0f,-0.75f,3f );
gl.glEnd();
}
@Override
public void dispose( GLAutoDrawable arg0 ) {
//method body
}
@Override
public void init( GLAutoDrawable arg0 ) {
//method body
}
@Override
public void reshape( GLAutoDrawable drawable, int x, int y, int width, int height ) {
GL2 gl = drawable.getGL().getGL2();
if( height <= 0 )
height = 1;
final float h = ( float ) width/( float ) height;
gl.glViewport( 0, 0, width, height );
gl.glMatrixMode( GL2.GL_PROJECTION );
gl.glLoadIdentity();
glu.gluPerspective( 45.0f, h, 1.0, 20.0 );
gl.glMatrixMode( GL2.GL_MODELVIEW );
gl.glLoadIdentity();
}
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 );
Line3d line3d = new Line3d();
glcanvas.addGLEventListener( line3d );
glcanvas.setSize( 400, 400 );
//creating frame
final JFrame frame = new JFrame (" 3d line");
//adding canvas to it
frame.getContentPane().add( glcanvas );
frame.setSize(frame.getContentPane().getPreferredSize() );
frame.setVisible( true );
}//end of main
}//end of class上記のプログラムをコンパイルして実行すると、次の出力が生成されます-
上記のビューを生成する* glVertex3f（）*メソッドのz象限にゼロ以外の値を与えることにより、3D形状を描画できます。 残りの線を結合すると、3Dエッジになります。
次に、同じ方法で3次元のエッジを開発します。
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.media.opengl.glu.GLU;
import javax.swing.JFrame;
public class Edge1 implements GLEventListener {
private GLU glu = new GLU();
@Override
public void display(GLAutoDrawable drawable) {
//TODO Auto-generated method stub
final GL2 gl = drawable.getGL().getGL2();
gl.glTranslatef(0f, 0f, -2.5f);
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f(-0.75f,0f,0);
gl.glVertex3f(0f,-0.75f, 0);
gl.glEnd();
//3d line
gl.glBegin(GL2.GL_LINES);
//3 units in to the window
gl.glVertex3f(-0.75f,0f,3f);
gl.glVertex3f(0f,-0.75f,3f);
gl.glEnd();
//top
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f(-0.75f,0f,0);
gl.glVertex3f(-0.75f,0f,3f);
gl.glEnd();
//bottom
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f(0f,-0.75f, 0);
gl.glVertex3f(0f,-0.75f,3f);
gl.glEnd();
}
@Override
public void dispose(GLAutoDrawable arg0) {
//method body
}
@Override
public void init(GLAutoDrawable arg0) {
//method body
}
@Override
public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
//TODO Auto-generated method stubfinal
GL2 gl = drawable.getGL().getGL2();
if(height <= 0)
height = 1;
final float h = (float) width/(float) height;
gl.glViewport(0, 0, width, height);
gl.glMatrixMode(GL2.GL_PROJECTION);
gl.glLoadIdentity();
glu.gluPerspective(45.0f, h, 1.0, 20.0);
gl.glMatrixMode(GL2.GL_MODELVIEW);
gl.glLoadIdentity();
}
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);
Edge1 b = new Edge1();
glcanvas.addGLEventListener(b);
glcanvas.setSize(400, 400);
//creating frame
final JFrame frame = new JFrame (" 3d edge");
//adding canvas to it
frame.getContentPane().add(glcanvas);
frame.setSize(frame.getContentPane().getPreferredSize());
frame.setVisible(true);
}//end of main
}//end of class上記のプログラムをコンパイルして実行すると、次の出力が生成されます-
同様に、2D四辺形の対応する辺に3Dエッジを展開し、隣接する頂点を結合することにより、3D四辺形を取得できます。
以下は、JOGLを使用して菱形を描くプログラムです。
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.media.opengl.glu.GLU;
import javax.swing.JFrame;
public class Rhombus implements GLEventListener {
private GLU glu = new GLU();
@Override
public void display(GLAutoDrawable drawable) {
final GL2 gl = drawable.getGL().getGL2();
gl.glTranslatef(0f, 0f, -2.5f);
//drawing edge1.....
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f(-0.75f,0f,0);
gl.glVertex3f(0f,-0.75f, 0);
gl.glEnd();
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f(-0.75f,0f,3f);//3 units into the window
gl.glVertex3f(0f,-0.75f,3f);
gl.glEnd();
//top
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f(-0.75f,0f,0);
gl.glVertex3f(-0.75f,0f,3f);
gl.glEnd();
//bottom
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f(0f,-0.75f, 0);
gl.glVertex3f(0f,-0.75f,3f);
gl.glEnd();
//edge 2....
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f(0f,-0.75f, 0);
gl.glVertex3f(0.75f,0f, 0);
gl.glEnd();
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f(0f,-0.75f, 3f);
gl.glVertex3f(0.75f,0f, 3f);
gl.glEnd();
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f(0f,-0.75f, 0);
gl.glVertex3f(0f,-0.75f, 3f);
gl.glEnd();
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f(0.75f,0f, 0);
gl.glVertex3f(0.75f,0f, 3f);
gl.glEnd();
//Edge 3.............
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f( 0.0f,0.75f,0);
gl.glVertex3f(-0.75f,0f,0);
gl.glEnd();
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f( 0.0f,0.75f,3f);
gl.glVertex3f(-0.75f,0f,3f);
gl.glEnd();
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f( 0.0f,0.75f,0);
gl.glVertex3f( 0.0f,0.75f,3f);
gl.glEnd();
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f(-0.75f,0f,0);
gl.glVertex3f(-0.75f,0f,3f);
gl.glEnd();
//final edge
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f(0.75f,0f, 0);
gl.glVertex3f( 0.0f,0.75f,0);
gl.glEnd();
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f(0.75f,0f,3f);
gl.glVertex3f( 0.0f,0.75f,3f);
gl.glEnd();
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f(0.75f,0f, 0);
gl.glVertex3f(0.75f,0f,3f);
gl.glEnd();
gl.glBegin(GL2.GL_LINES);
gl.glVertex3f( 0.0f,0.75f,0);
gl.glVertex3f( 0.0f,0.75f,3f);
gl.glEnd();
}
@Override
public void dispose(GLAutoDrawable arg0) {
//method body
}
@Override
public void init(GLAutoDrawable arg0) {
//method body
}
@Override
public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
//TODO Auto-generated method stub final
GL2 gl = drawable.getGL().getGL2();
if(height lt;= 0)
height = 1;
final float h = (float) width/(float) height;
gl.glViewport(3, 6, width, height);
gl.glMatrixMode(GL2.GL_PROJECTION);
gl.glLoadIdentity();
glu.gluPerspective(45.0f, h, 1.0, 20.0);
gl.glMatrixMode(GL2.GL_MODELVIEW);
gl.glLoadIdentity();
}
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);
Rhombus b = new Rhombus();
glcanvas.addGLEventListener(b);
glcanvas.setSize(400, 400);
//creating frame
final JFrame frame = new JFrame (" Rhombus 3d");
//adding canvas to it
frame.getContentPane().add(glcanvas);
frame.setSize(frame.getContentPane().getPreferredSize());
frame.setVisible(true);
}//end of main
}//end of classimport javax.media.opengl.GL2;上記のプログラムをコンパイルして実行すると、次の出力が生成されます。 3Dラインを使用して描画された菱形を示しています。
- glBegin（）*メソッドの定義済みパラメーターは、3D形状の描画に使用できます。
