cohensutherlandclipping.java

基于java的3d开发库。对坐java3d的朋友有很大的帮助。

//===========================================================================
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Component;
import java.awt.Adjustable;
import java.awt.event.ActionEvent;
import java.awt.event.AdjustmentEvent;
import java.awt.event.ActionListener;
import java.awt.event.AdjustmentListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseWheelListener;
import java.awt.event.MouseMotionListener;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JButton;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JOptionPane;
import javax.swing.JRadioButton;
import javax.swing.JScrollBar;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.border.Border;
import javax.swing.border.EtchedBorder;

import javax.media.opengl.GL;
import javax.media.opengl.glu.GLU;
import javax.media.opengl.GLCanvas;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLDrawableFactory;
import javax.media.opengl.GLEventListener;

import vsdk.toolkit.common.VSDK;
import vsdk.toolkit.common.Vector3D;
import vsdk.toolkit.common.Ray;
import vsdk.toolkit.common.Matrix4x4;
import vsdk.toolkit.environment.Camera;
import vsdk.toolkit.gui.CameraController;
import vsdk.toolkit.gui.CameraControllerAquynza;
import vsdk.toolkit.render.jogl.JoglCameraRenderer;

public class CohenSutherlandClipping extends JFrame implements 
GLEventListener, MouseListener, MouseMotionListener, MouseWheelListener, 
KeyListener
{
    // Application data model
    public Camera camera1;
    public Camera camera2;
    public Camera lastPerspectiveCamera;
    public Vector3D point0;
    public Vector3D point1;

    public Vector3D testVector = new Vector3D();

    // Application GUI artifacts
    private ControlPanel controls;
    private JMenuBar menubar;
    public CameraController cameraController;
    public GLCanvas canvas;
    int cameraMode;

    public static final int TOPVIEW = 1;
    public static final int FRONTVIEW = 2;
    public static final int LEFTVIEW = 3;
    public static final int PERSPECTIVEVIEW = 4;

    public CohenSutherlandClipping() {
        super("VITRAL concept test - Perspective tests");

        cameraMode = PERSPECTIVEVIEW;

        canvas = new GLCanvas();

        canvas.addGLEventListener(this);
        canvas.addMouseListener(this);
        canvas.addMouseMotionListener(this);
        canvas.addKeyListener(this);

        controls = new ControlPanel(this);
        menubar = this.buildMenu();

        this.add(canvas, BorderLayout.CENTER);
        this.add(controls, BorderLayout.SOUTH);
        this.setJMenuBar(menubar);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //-----------------------------------------------------------------
        Matrix4x4 R = new Matrix4x4();

        R.eulerAnglesRotation(Math.toRadians(110), Math.toRadians(-25), 0);
        camera1 = new Camera();
        camera1.setPosition(new Vector3D(1.5, -5, 2.5));
        camera1.setRotation(R);
        camera1.setFarPlaneDistance(300);

        camera2 = new Camera();
        camera2.setPosition(new Vector3D(0, 0, 1));
        camera2.setNearPlaneDistance(1);
        camera2.setFarPlaneDistance(3);
        camera2.setFov(90);
        R.eulerAnglesRotation(Math.toRadians(90), Math.toRadians(-90), 0);
        camera2.setRotation(R);

        //-----------------------------------------------------------------

        cameraController = new CameraControllerAquynza(camera1);

        point0 = new Vector3D(0, 0, 0.6);
        point1 = new Vector3D(0, 0, -10);
        //point0 = new Vector3D(-3, 0, -2.5);
        //point1 = new Vector3D(0, 0, 0.5);
    }

    public void setPerspectiveView()
    {
        if ( cameraMode != PERSPECTIVEVIEW ) {
            camera1.setPosition(lastPerspectiveCamera.getPosition());
            camera1.setRotation(lastPerspectiveCamera.getRotation());
            camera1.setProjectionMode(camera1.PROJECTION_MODE_PERSPECTIVE);
            cameraMode = PERSPECTIVEVIEW;
        }
    }

    public void setTopView()
    {
        Matrix4x4 R = new Matrix4x4();
        if ( cameraMode == PERSPECTIVEVIEW ) {
            lastPerspectiveCamera = new Camera(camera1);
        }
        cameraMode = TOPVIEW;
        camera1.setPosition(new Vector3D(0, 0, 5));
        R.eulerAnglesRotation(Math.toRadians(90), Math.toRadians(-90), 0);
        camera1.setRotation(R);
        camera1.setProjectionMode(camera1.PROJECTION_MODE_ORTHOGONAL);
        camera1.setOrthogonalZoom(0.25);
    }

    public void setFrontView()
    {
        Matrix4x4 R = new Matrix4x4();
        if ( cameraMode == PERSPECTIVEVIEW ) {
            lastPerspectiveCamera = new Camera(camera1);
        }
        cameraMode = TOPVIEW;
        camera1.setPosition(new Vector3D(0, -10, 0));
        R.eulerAnglesRotation(Math.toRadians(90), 0, 0);
        camera1.setRotation(R);
        camera1.setProjectionMode(camera1.PROJECTION_MODE_ORTHOGONAL);
        camera1.setOrthogonalZoom(0.25);
    }

    public void setLeftView()
    {
        Matrix4x4 R = new Matrix4x4();
        if ( cameraMode == PERSPECTIVEVIEW ) {
            lastPerspectiveCamera = new Camera(camera1);
        }
        cameraMode = TOPVIEW;
        camera1.setPosition(new Vector3D(-10, 0, 0));
        camera1.setRotation(R);
        camera1.setProjectionMode(camera1.PROJECTION_MODE_ORTHOGONAL);
        camera1.setOrthogonalZoom(0.25);
    }

    public Dimension getPreferredSize() {
        return new Dimension (800, 600);
    }
    
    public static void main (String[] args) {
        JFrame f = new CohenSutherlandClipping();
        f.pack();
        f.setVisible(true);
    }

    private void
    drawMark(GL gl, double delta)
    {
        gl.glBegin(GL.GL_LINES);
            gl.glVertex3d(-delta/2, 0, 0);
            gl.glVertex3d(delta/2, 0, 0);
            gl.glVertex3d(0, -delta/2, 0);
            gl.glVertex3d(0, delta/2, 0);
            gl.glVertex3d(0, 0, -delta/2);
            gl.glVertex3d(0, 0, delta/2);
        gl.glEnd();
    }
    
    private void drawObjectsGL(GL gl)
    {
        gl.glEnable(gl.GL_DEPTH_TEST);

        gl.glLoadIdentity();

        //-----------------------------------------------------------------
        gl.glLineWidth((float)2.0);
        gl.glBegin(GL.GL_LINES);
        gl.glColor3d(1, 0, 0);
        gl.glVertex3d(0, 0, 0);
        gl.glVertex3d(1, 0, 0);

        gl.glColor3d(0, 1, 0);
        gl.glVertex3d(0, 0, 0);
        gl.glVertex3d(0, 1, 0);

        gl.glColor3d(0, 0, 1);
        gl.glVertex3d(0, 0, 0);
        gl.glVertex3d(0, 0, 1);
        gl.glEnd();

        boolean linePasses;

        Vector3D clippedPoint0 = new Vector3D();
        Vector3D clippedPoint1 = new Vector3D();

        camera2.updateVectors();

        //linePasses = camera2.clipLineCohenSutherlandPlanes(
        //    point0, point1, clippedPoint0, clippedPoint1);

        linePasses = camera2.clipLineCohenSutherlandCanonicVolume(
            point0, point1, clippedPoint0, clippedPoint1);

        Matrix4x4 NT = camera2.getNormalizingTransformation().inverse();

        clippedPoint0 = NT.multiply(clippedPoint0);
        clippedPoint1 = NT.multiply(clippedPoint1);

        //-----------------------------------------------------------------
        double delta = 0.1;

        gl.glLoadIdentity();
        gl.glTranslated(point0.x, point0.y, point0.z);
        gl.glLineWidth((float)1.0);
        gl.glColor3d(1, 1, 1);
        drawMark(gl, delta);

        gl.glLoadIdentity();
        gl.glTranslated(point1.x, point1.y, point1.z);
        gl.glLineWidth((float)1.0);
        gl.glColor3d(1, 1, 0);
        drawMark(gl, delta);

        //-----------------------------------------------------------------
        gl.glLoadIdentity();
        gl.glLineWidth((float)1.0);
        gl.glColor3d(1, 0, 1);
        gl.glBegin(GL.GL_LINES);
            gl.glVertex3d(point0.x, point0.y, point0.z);
            gl.glVertex3d(point1.x, point1.y, point1.z);
        gl.glEnd();
        if ( linePasses == true ) {
            gl.glLineWidth((float)5.0);
            gl.glBegin(GL.GL_LINES);
                gl.glVertex3d(clippedPoint0.x, clippedPoint0.y,
                    clippedPoint0.z);
                gl.glVertex3d(clippedPoint1.x, clippedPoint1.y,
                    clippedPoint1.z);
            gl.glEnd();
        }
        //-----------------------------------------------------------------
    }

    /** Called by drawable to initiate drawing */
    public void display(GLAutoDrawable drawable) {
        GL gl = drawable.getGL();

        gl.glClearColor(0, 0, 0, 1);
        gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
        gl.glColor3d(1, 1, 1);

        JoglCameraRenderer.activate(gl, camera1);

        drawObjectsGL(gl);

        gl.glLoadIdentity();
        JoglCameraRenderer.draw(gl, camera2);
    }
   
    /** Not used method, but needed to instanciate GLEventListener */
    public void init(GLAutoDrawable drawable) {
        ;
    }

    /** Not used method, but needed to instanciate GLEventListener */
    public void displayChanged(GLAutoDrawable drawable, boolean a, boolean b) {
        ;