Учитывая этот простой пример, который я получил из вики JOGAMP, с какой стати координаты мыши должны быть на 40 в направлении y и на 20 в направлении x? При нажатии в правом нижнем углу экрана отображаются координаты (620, 440), а не (640, 480), как я ожидал.
Спасибо за помощь!
Вот программа:
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.GLProfile;
import javax.media.opengl.GLCapabilities;
import javax.media.opengl.awt.GLCanvas;
import javax.swing.JFrame;
import java.awt.BorderLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
/**
* A minimal program that draws with JOGL in a Swing JFrame using the AWT GLCanvas.
*
* @author Wade Walker
*/
public class OneTriangleSwingGLCanvas implements MouseListener{
static {
// setting this true causes window events not to get sent on Linux if you run from inside Eclipse
GLProfile.initSingleton( false );
}
public static void main( String [] args ) {
GLProfile glprofile = GLProfile.getDefault();
GLCapabilities glcapabilities = new GLCapabilities( glprofile );
final GLCanvas glcanvas = new GLCanvas( glcapabilities );
OneTriangleSwingGLCanvas mouse = new OneTriangleSwingGLCanvas();
glcanvas.addMouseListener(mouse);
glcanvas.addGLEventListener( new GLEventListener() {
@Override
public void reshape( GLAutoDrawable glautodrawable, int x, int y, int width, int height ) {
OneTriangle.setup( glautodrawable.getGL().getGL2(), width, height );
}
@Override
public void init( GLAutoDrawable glautodrawable ) {
}
@Override
public void dispose( GLAutoDrawable glautodrawable ) {
}
@Override
public void display( GLAutoDrawable glautodrawable ) {
OneTriangle.render( glautodrawable.getGL().getGL2(), glautodrawable.getWidth(), glautodrawable.getHeight() );
}
});
final JFrame jframe = new JFrame( "One Triangle Swing GLCanvas" );
jframe.addWindowListener( new WindowAdapter() {
public void windowClosing( WindowEvent windowevent ) {
jframe.dispose();
System.exit( 0 );
}
});
jframe.getContentPane().add( glcanvas, BorderLayout.CENTER );
jframe.setSize( 640, 480 );
jframe.setVisible( true );
}
@Override
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
System.out.println("Mouse pressed at : (" + e.getX() + ", " + e.getY() + ")");
}
@Override
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mousePressed(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseReleased(MouseEvent e) {
// TODO Auto-generated method stub
}
}
//OneTriangle.java
import javax.media.opengl.GL;
import javax.media.opengl.GL2;
import javax.media.opengl.glu.GLU;
public class OneTriangle {
protected static void setup( GL2 gl2, int width, int height ) {
gl2.glMatrixMode( GL2.GL_PROJECTION );
gl2.glLoadIdentity();
// coordinate system origin at lower left with width and height same as the window
GLU glu = new GLU();
glu.gluOrtho2D( 0.0f, width, 0.0f, height );
gl2.glMatrixMode( GL2.GL_MODELVIEW );
gl2.glLoadIdentity();
gl2.glViewport( 0, 0, width, height );
}
protected static void render( GL2 gl2, int width, int height ) {
gl2.glClear( GL.GL_COLOR_BUFFER_BIT );
// draw a triangle filling the window
gl2.glLoadIdentity();
gl2.glBegin( GL.GL_TRIANGLES );
gl2.glColor3f( 1, 0, 0 );
gl2.glVertex2f( 0, 0 );
gl2.glColor3f( 0, 1, 0 );
gl2.glVertex2f( width, 0 );
gl2.glColor3f( 0, 0, 1 );
gl2.glVertex2f( width / 2, height );
gl2.glEnd();
}
}