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//http://hi.baidu.com/yjy2410578/blog/item/9748eaf4af867ae77709d77b.html
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.Polygon;
import java.awt.geom.GeneralPath;
import java.util.Arrays;
import java.util.Random;
import java.util.Vector;
import javax.media.j3d.Appearance;
import javax.media.j3d.Background;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.ColoringAttributes;
import javax.media.j3d.DirectionalLight;
import javax.media.j3d.Geometry;
import javax.media.j3d.GeometryArray;
import javax.media.j3d.LineArray;
import javax.media.j3d.LineAttributes;
import javax.media.j3d.LineStripArray;
import javax.media.j3d.Material;
import javax.media.j3d.PointArray;
import javax.media.j3d.PointAttributes;
import javax.media.j3d.PolygonAttributes;
import javax.media.j3d.QuadArray;
import javax.media.j3d.Shape3D;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.media.j3d.TransparencyAttributes;
import javax.media.j3d.TriangleArray;
import javax.media.j3d.TriangleFanArray;
import javax.media.j3d.TriangleStripArray;
import javax.vecmath.Color3f;
import javax.vecmath.Matrix4f;
import javax.vecmath.Point3d;
import javax.vecmath.Point3f;
import javax.vecmath.Point4f;
import javax.vecmath.Quat4f;
import javax.vecmath.Vector3f;
import javax.vecmath.Vector4f;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.behaviors.mouse.MouseRotate;
import com.sun.j3d.utils.behaviors.mouse.MouseTranslate;
import com.sun.j3d.utils.behaviors.mouse.MouseZoom;
import com.sun.j3d.utils.geometry.Box;
import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.geometry.Cone;
import com.sun.j3d.utils.geometry.Cylinder;
import com.sun.j3d.utils.geometry.Sphere;
import com.sun.j3d.utils.scenegraph.io.state.javax.media.j3d.TransparencyAttributesState;
import com.sun.j3d.utils.universe.SimpleUniverse;
public class My3d extends Applet{
public BranchGroup mywork(){
BranchGroup Root = new BranchGroup();
BoundingSphere bounds = new BoundingSphere(new Point3d(0,0,0),100 );
Color3f bgColor = new Color3f(1,1,1);
Background bg= new Background(bgColor);
bg.setApplicationBounds(bounds);
Root.addChild(bg);
Color3f diColor = new Color3f(1,0,0);
Vector3f vec = new Vector3f(0,0,-1);
DirectionalLight dili = new DirectionalLight(diColor,vec);
dili.setInfluencingBounds(bounds);
Root.addChild(dili);
TransformGroup trans = new TransformGroup();
trans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
trans.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
Root.addChild(trans);
MouseRotate mrot = new MouseRotate();
mrot.setTransformGroup(trans);
Root.addChild(mrot);
mrot.setSchedulingBounds(bounds);
MouseZoom mzoom = new MouseZoom();
mzoom.setTransformGroup(trans);
Root.addChild(mzoom);
mzoom.setSchedulingBounds(bounds);
MouseTranslate mtr = new MouseTranslate();
mtr.setTransformGroup(trans);
Root.addChild(mtr);
mtr.setSchedulingBounds(bounds);
trans.addChild(myctrl());
trans.addChild(mybezier());
Root.compile();
return Root;
}
private Shape3D mybezier(){
Shape3D ret = new Shape3D();
ret.setGeometry(bezier());
ret.setAppearance(mkapp());
return ret;
}
private Geometry bezier(){
float [][] M = {{1, 0, 0, 0},
{-3, 3, 0, 0},
{3 ,-6, 3, 0},
{-1, 3, -3,1}};
int nt = 100;
float [] t = new float[nt];
float div =(float)(1.0/(nt-1));
int i;
for (i=0;i<nt;i++){
t[i]=i*div;
}
//ctrl 2 float[][]
float [][] pset = new float[4][4];
for (i=0;i<4;i++){
ctrl[i].get(pset[i]);
}
Point3f []curv = new Point3f[nt];
for (i=0;i<nt;i++){
float [] tt = {1,t[i],t[i]*t[i],t[i]*t[i]*t[i]};
float [] tmp = mymul(tt,M);
tmp = mymul(tmp,pset);
curv[i] = new Point3f(tmp[0]/tmp[3],tmp[1]/tmp[3],tmp[2]/tmp[3]);
}
LineStripArray la = new LineStripArray(nt , GeometryArray.COORDINATES,new int[]{nt});
la.setCoordinates(0, curv);
return la;
}
private float [] mymul(float []tt ,float[][] M){
int i,j,k;
float [] ret = new float[4];
for (i=0;i<4;i++){
ret[i]=0;
for (j=0;j<4;j++){
ret[i]+=tt[j]*M[j][i];
}
}
return ret;
}
private Shape3D myctrl(){
Shape3D ret = new Shape3D();
ret.setGeometry(mkgeo());
ret.setAppearance(mkapp());
return ret;
}
int vct = 4;
private Point4f []ctrl=new Point4f[4];
private Geometry mkgeo(){
LineStripArray linectrl = new LineStripArray(vct , GeometryArray.COORDINATES ,new int []{vct});
linectrl.setCoordinates(0, cover(ctrl));
return linectrl;
}
private Point3f [] cover(Point4f [] pset){
Point3f[] ret = new Point3f[pset.length];
for (int i=0;i<pset.length;i++){
float w = pset[i].w;
ret[i]=new Point3f(pset[i].x/w , pset[i].y/w , pset[i].z/w);
}
return ret;
}
private Appearance mkapp(){
Appearance app =new Appearance();
PolygonAttributes pa = new PolygonAttributes();
//pa.setPolygonMode(PolygonAttributes.POLYGON_LINE);
//pa.setCullFace(PolygonAttributes.CULL_NONE);
LineAttributes la =new LineAttributes();
la.setLineWidth(40.0f);
ColoringAttributes ca = new ColoringAttributes();
ca.setColor(new Color3f(1,0,0));
app.setColoringAttributes(ca);
app.setPolygonAttributes(pa);
app.setLineAttributes(la);
return app;
}
public My3d() {
ctrl[0] = new Point4f(-0.8f , -0.6f ,0 ,1);
ctrl[1] = new Point4f(-0.2f,0.2f,0,1);
ctrl[2] = new Point4f(0.2f,0.3f,0,1);
ctrl[3] = new Point4f(0.8f,-0.5f,0,1);
// TODO Auto-generated constructor stub
setLayout(new BorderLayout());
GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration();
Canvas3D c = new Canvas3D(config);
add("Center",c);
BranchGroup sc = mywork();
sc.compile();
SimpleUniverse su = new SimpleUniverse(c);
su.getViewingPlatform().setNominalViewingTransform();
su.addBranchGraph(sc);
}
public static void main(String[] args) {
Frame f = new MainFrame(new My3d(),512,512);
}
}
//end |
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