How to set the axis (triple axis) in a fixed position on the screen in JavaFX?
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Java
How to set the axis (triple axis) in a fixed position on the screen in JavaFX? I am currently developing an application that I want to display the axis (triple axis) in a fixed position on the screen (i.e. the lower left corner) I hope the rotation of the axis should be synchronized with the main object Zoom and pan operations should not be applied to axes
But I have some difficulty displaying the axis at a specific position on the screen
I have used the screentolocal method to get the fixed position in the scene, but it only returns the point2d object, which is not helpful for setting the 3D translation value
Can you help me solve this problem?
The source code based on this example is as follows:
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.geometry.Bounding@R_213_2419@;
import javafx.geometry.Bounds;
import javafx.geometry.Point2D;
import javafx.geometry.Point3D;
import javafx.scene.DepthTest;
import javafx.scene.Group;
import javafx.scene.PerspectiveCamera;
import javafx.scene.Scene;
import javafx.scene.input.MouseEvent;
import javafx.scene.input.ScrollEvent;
import javafx.scene.paint.Color;
import javafx.scene.paint.Material;
import javafx.scene.paint.PhongMaterial;
import javafx.scene.shape.@R_213_2419@;
import javafx.scene.shape.Cylinder;
import javafx.scene.shape.DrawMode;
import javafx.scene.shape.MeshView;
import javafx.scene.shape.Sphere;
import javafx.scene.shape.TriangleMesh;
import javafx.scene.transform.Rotate;
import javafx.scene.transform.Transform;
import javafx.scene.transform.Translate;
import javafx.stage.Stage;
public class TrafoTest extends Application {
final Group root = new Group();
Group axis = new Group();
final XformWorld world = new XformWorld();
final PerspectiveCamera camera = new PerspectiveCamera(true);
final XformCamera cameraXform = new XformCamera();
final XformCamera cameraXform2 = new XformCamera();
final XformCamera cameraXform3 = new XformCamera();
private static final double CAMERA_INITIAL_DISTANCE = -1000;
private static final double CAMERA_NEAR_CLIP = 0.1;
private static final double CAMERA_FAR_CLIP = 10000.0;
private static final double MOUSE_SPEED = 1;
private static final double ROTATION_SPEED = 4.0;
private static final double TRACK_SPEED = 0.02;
double mousePosX,mousePosY,mouSEOldX,mouSEOldY,mouseDeltaX,mouseDeltaY;
double mouseFactorX,mouseFactorY;
Stage stage;
@Override
public void start(Stage primaryStage) {
root.getChildren().add(world);
root.setDepthTest(DepthTest.ENABLE);
buildCamera();
buildBodySystem();
Scene scene = new Scene(root,800,600,true);
scene.setFill(Color.GREY);
handleMouse(scene);
this.stage = primaryStage;
primaryStage.setTitle("TrafoTest");
primaryStage.setScene(scene);
primaryStage.show();
scene.setCamera(camera);
mouseFactorX = 180.0 / scene.getWidth();
mouseFactorY = 180.0 / scene.getHeight();
}
private void buildCamera() {
root.getChildren().add(cameraXform);
cameraXform.getChildren().add(cameraXform2);
cameraXform2.getChildren().add(cameraXform3);
cameraXform3.getChildren().add(camera);
camera.setNearClip(CAMERA_NEAR_CLIP);
camera.setFarClip(CAMERA_FAR_CLIP);
camera.setTranslateZ(CAMERA_INITIAL_DISTANCE);
}
private void buildBodySystem() {
PhongMaterial whiteMaterial = new PhongMaterial();
whiteMaterial.setDiffuseColor(Color.WHITE);
whiteMaterial.setSpecularColor(Color.LIGHTBLUE);
@R_213_2419@ @R_213_2419@ = new @R_213_2419@(400,200,100);
@R_213_2419@.setMaterial(whiteMaterial);
@R_213_2419@.setDrawMode(DrawMode.LINE);
PhongMaterial redMaterial = new PhongMaterial();
redMaterial.setDiffuseColor(Color.DARKRED);
redMaterial.setSpecularColor(Color.RED);
Sphere sphere = new Sphere(5);
sphere.setMaterial(redMaterial);
sphere.setTranslateX(200.0);
sphere.setTranslateY(-100.0);
sphere.setTranslateZ(-50.0);
axis = drawReferenceFrame();
world.getChildren().addAll(axis);
world.getChildren().add(@R_213_2419@);
world.getChildren().addAll(sphere);
}
private void handleMouse(Scene scene) {
scene.setOnMousePressed((MouseEvent me) -> {
mousePosX = me.getSceneX();
mousePosY = me.getSceneY();
mouSEOldX = me.getSceneX();
mouSEOldY = me.getSceneY();
});
scene.setOnMouseDragged((MouseEvent me) -> {
mouSEOldX = mousePosX;
mouSEOldY = mousePosY;
mousePosX = me.getSceneX();
mousePosY = me.getSceneY();
mouseDeltaX = (mousePosX - mouSEOldX);
mouseDeltaY = (mousePosY - mouSEOldY);
if (me.isPrimaryButtonDown()) {
cameraXform.ry(mouseDeltaX * 180.0 / scene.getWidth());
cameraXform.rx(-mouseDeltaY * 180.0 / scene.getHeight());
Bounding@R_213_2419@ point = (Bounding@R_213_2419@) root.screenToLocal(new Bounding@R_213_2419@(root.getLayoutX()+350,root.getLayoutY()+650,20));
System.out.println(point);
axis.setTranslateX(point.getMinX());
axis.setTranslateY(point.getMinY());
axis.setTranslateZ(point.getMinZ());
} else if (me.isSecondaryButtonDown()) {
cameraXform2.setTx((cameraXform2.t.getX() + (-mouseDeltaX)*MOUSE_SPEED*TRACK_SPEED));
cameraXform2.setTy((cameraXform2.t.getY() + (-mouseDeltaY)*MOUSE_SPEED*TRACK_SPEED));
camera.setTranslateZ(camera.getTranslateZ() + mouseDeltaY);
}
});
scene.setOnScroll(new EventHandler<ScrollEvent>() {
@Override
public void handle(ScrollEvent event) {
double z = cameraXform3.getTranslateZ();
double newZ = z - event.getDeltaY() * MOUSE_SPEED * 0.05;
cameraXform3.setTranslateZ(newZ);
}
});
}
public static void main(String[] args) {
launch(args);
}
private Group drawReferenceFrame(){
Group G1= new Group();
Cylinder CX = new Cylinder(2,25);
Cylinder CY = new Cylinder(2,25);
Cylinder CZ = new Cylinder(2,25);
Sphere S = new Sphere(4);
Material mat =new PhongMaterial(Color.WHITE);
PhongMaterial Xmat = new PhongMaterial();
Xmat.setDiffuseColor(Color.GREEN);
PhongMaterial Ymat = new PhongMaterial();
Ymat.setDiffuseColor(Color.BLUE);
PhongMaterial Zmat = new PhongMaterial();
Zmat.setDiffuseColor(Color.RED);
S.setMaterial(Zmat);
CY.setMaterial(mat);
// CY.setRotationAxis(Rotate.X_AXIS);
// CY.setRotate(90);
CY.setTranslateY(-12.5);
CX.setMaterial(mat);
CX.setTranslateX(15);
CX.setRotationAxis(Rotate.Z_AXIS);
CX.setRotate(90);
CZ.setMaterial(mat);
CZ.setRotationAxis(Rotate.X_AXIS);
CZ.setRotate(90);
CZ.setTranslateZ(-12.5);
G1.getChildren().addAll(CX,CY,CZ,S);
TriangleMesh coneMeshY = createCone(3.5f,7.5f);
TriangleMesh coneMeshX = createCone(3.5f,7.5f);
TriangleMesh coneMeshZ = createCone(3.5f,7.5f);
MeshView yCone = new MeshView(coneMeshY);
MeshView xCone = new MeshView(coneMeshX);
MeshView zCone = new MeshView(coneMeshZ);
yCone.setMaterial(Ymat);
yCone.setTranslateY(-32.5);
yCone.setDrawMode(DrawMode.FILL);
xCone.setMaterial(Xmat);
xCone.setTranslateY(-3.75);
xCone.setRotationAxis(Rotate.Z_AXIS);
xCone.setRotate(90);
xCone.setTranslateX(28.5);
xCone.setDrawMode(DrawMode.FILL);
zCone.setRotationAxis(Rotate.X_AXIS);
zCone.setTranslateY(-3.75);
zCone.setRotate(90);
zCone.setTranslateZ(-28.5);
zCone.setDrawMode(DrawMode.FILL);
zCone.setMaterial(Zmat);
G1.getChildren().addAll(xCone,yCone,zCone);
// G1.setScale(0.45);
return G1;
}
private TriangleMesh createCone( float radius,float height) {
int divisions=500;
TriangleMesh mesh = new TriangleMesh();
mesh.getPoints().addAll(0,0);
double segment_angle = 2.0 * Math.PI / divisions;
float x,z;
double angle;
double halfCount = (Math.PI / 2 - Math.PI / (divisions / 2));
for(int i=divisions+1;--i >= 0; ) {
angle = segment_angle * i;
x = (float)(radius * Math.cos(angle - halfCount));
z = (float)(radius * Math.sin(angle - halfCount));
mesh.getPoints().addAll(x,height,z);
}
mesh.getPoints().addAll(0,0);
mesh.getTexCoords().addAll(0,0);
for(int i=1;i<=divisions;i++) {
mesh.getFaces().addAll(
0,i+1,i,//COunter clock wise
divisions+2,0 // Clock wise
);
}
return mesh;
}
}
class XformWorld extends Group {
final Translate t = new Translate(0.0,0.0,0.0);
final Rotate rx = new Rotate(0,Rotate.X_AXIS);
final Rotate ry = new Rotate(0,Rotate.Y_AXIS);
final Rotate rz = new Rotate(0,Rotate.Z_AXIS);
public XformWorld() {
super();
this.getTransforms().addAll(t,rx,ry,rz);
}
}
class XformCamera extends Group {
Point3D px = new Point3D(1.0,0.0);
Point3D py = new Point3D(0.0,1.0,0.0);
Rotate r;
Transform tx = new Rotate();
Translate t = new Translate();
public XformCamera() {
super();
}
public void rx(double angle) {
r = new Rotate(angle,px);
this.tx = tx.createConcatenation(r);
this.getTransforms().clear();
this.getTransforms().addAll(tx);
}
public void ry(double angle) {
r = new Rotate(angle,py);
this.tx = tx.createConcatenation(r);
this.getTransforms().clear();
this.getTransforms().addAll(tx);
}
public void setTx(double x) {
t.setX(x);
this.getTransforms().clear();
this.getTransforms().addAll(t);
}
public void setTy(double y) {
t.setY(y);
this.getTransforms().clear();
this.getTransforms().addAll(t);
}
}
In the above code, first I translate the axis in the lower left corner of the screen, but after rotating the main object (i.e. @ r_213_2419 @ and sphere), the axis is also translated I want to rotate the main object and axis around their own origin
If I try to zoom in (change the camera Z position), the I-Axis position will also change relative to the screen
In the above example, I want to display my axis in the lower left corner of the screen, and the rotation of the axis should be synchronized with the main object
Solution
This change keeps the axis at the origin and moves the box to
P = (size / 2,-size / 2,-size / 2)
Relative to the axis and translate the camera toward the bottom of the center of the screen Uncomment camera A call to settranslatex() to pan left Moving the mouse rotates the group around the origin of the axis Press the shift key to rotate around Z, and then use the mouse wheel to move the camera
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.PerspectiveCamera;
import javafx.scene.Scene;
import javafx.scene.input.MouseEvent;
import javafx.scene.input.ScrollEvent;
import javafx.scene.paint.Color;
import javafx.scene.paint.PhongMaterial;
import javafx.scene.shape.@R_213_2419@;
import javafx.scene.transform.Rotate;
import javafx.stage.Stage;
/**
* @see https://stackoverflow.com/a/37734966/230513
* @see https://stackoverflow.com/a/37714700/230513
* @see https://stackoverflow.com/a/37685167/230513
* @see https://stackoverflow.com/a/37370840/230513
*/
public class Triad@R_213_2419@ extends Application {
private static final double SIZE = 300;
private final Content content = Content.create(SIZE);
private static final class Content {
private static final double WIDTH = 3;
private final Group group = new Group();
private final Rotate rx = new Rotate(0,Rotate.X_AXIS);
private final Rotate ry = new Rotate(0,Rotate.Y_AXIS);
private final Rotate rz = new Rotate(0,Rotate.Z_AXIS);
private final @R_213_2419@ xAxis;
private final @R_213_2419@ yAxis;
private final @R_213_2419@ zAxis;
private final @R_213_2419@ @R_213_2419@;
private static Content create(double size) {
Content c = new Content(size);
c.group.getChildren().addAll(c.@R_213_2419@,c.xAxis,c.yAxis,c.zAxis);
c.group.getTransforms().addAll(c.rz,c.ry,c.rx);
return c;
}
private Content(double size) {
xAxis = create@R_213_2419@(size * 2,WIDTH,WIDTH);
yAxis = create@R_213_2419@(WIDTH,size * 2,WIDTH);
zAxis = create@R_213_2419@(WIDTH,size * 2);
double edge = 3 * size / 4;
@R_213_2419@ = new @R_213_2419@(edge,edge,edge);
@R_213_2419@.setMaterial(new PhongMaterial(Color.CORAL));
@R_213_2419@.setTranslateX(size / 2);
@R_213_2419@.setTranslateY(-size / 2);
@R_213_2419@.setTranslateZ(-size / 2);
}
private @R_213_2419@ create@R_213_2419@(double w,double h,double d) {
@R_213_2419@ b = new @R_213_2419@(w,h,d);
b.setMaterial(new PhongMaterial(Color.AQUA));
return b;
}
}
@Override
public void start(Stage primaryStage) throws Exception {
primaryStage.setTitle("JavaFX 3D");
Scene scene = new Scene(content.group,SIZE * 2,true);
primaryStage.setScene(scene);
scene.setFill(Color.BLACK);
scene.setOnMouseMoved((final MouseEvent e) -> {
if (e.isShiftDown()) {
content.rz.setAngle(e.getSceneX() * 360 / scene.getWidth());
} else {
content.rx.setAngle(e.getSceneY() * 360 / scene.getHeight());
content.ry.setAngle(e.getSceneX() * 360 / scene.getWidth());
}
});
PerspectiveCamera camera = new PerspectiveCamera(true);
camera.setFarClip(SIZE * 6);
//camera.setTranslateX(SIZE / 2);
camera.setTranslateY(-SIZE / 2);
camera.setTranslateZ(-4.5 * SIZE);
scene.setCamera(camera);
scene.setOnScroll((final ScrollEvent e) -> {
camera.setTranslateZ(camera.getTranslateZ() + e.getDeltaY());
});
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
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