对于 3d 星空(在 JavaFX 中),使标签与观察者的视角保持一致
For a 3d star field (in JavaFX), keeping the labels flat to the viewer perspective
注意:我找到了一个解决方案并编辑了这个例子来展示如何去做。我将把这段代码移到我更大的应用程序中。
我编写了一个 3d 恒星图表应用程序,它接收 GAIA 恒星数据并向您显示 3d 表示。您可以查询和绘制基于查询的一组基于其属性的恒星对象。此应用程序旨在帮助科幻作家、爱好者想象 space.
地区的真实关系。
当我构建视图时,我绘制了代表星星(半径、颜色等)的球体。
我为这些星星中的每一个都贴上了标签,以便用户可以识别出感兴趣的星星。
所以我的问题是,当我旋转视图(实际上是相机)时,标签会转动,用户会觉得这很不方便。那么如何在旋转视图时让它们面向相机呢?
一些细节。我保留两组。一个是绘制的所有星星,一个是标签。星星和标签都绘制在同一点上。分开组的原因是能够独立于星星打开和关闭标签(可用性问题)。
因此,当我旋转视野时,我想获取标签组并将每个标签转换为面向相机。
示例:(茎从赤道面投影到恒星,网格映射赤道面进行透视)
随着视图的转动:
这是工作示例。我找到了一个 FXyz 库示例并将其更改为执行我想要的操作。 FXyz 唯一使用的是 Mathutils.clamp(...).
import javafx.application.Application;
import javafx.application.Platform;
import javafx.geometry.Point3D;
import javafx.scene.*;
import javafx.scene.control.Label;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Background;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.paint.PhongMaterial;
import javafx.scene.shape.Shape3D;
import javafx.scene.shape.Sphere;
import javafx.scene.text.Font;
import javafx.scene.transform.Rotate;
import javafx.scene.transform.Translate;
import javafx.stage.Stage;
import java.util.HashMap;
import java.util.Random;
import static org.fxyz3d.geometry.MathUtils.clamp;
/**
* example for floating labels
*/
public class StarFieldExample extends Application {
final double sceneWidth = 600;
final double sceneHeight = 600;
private double mousePosX;
private double mousePosY;
private double mouseOldX;
private double mouseOldY;
private double mouseDeltaX;
private double mouseDeltaY;
private final Font font = new Font("arial", 10);
// We'll use custom Rotate transforms to manage the coordinate conversions
private final Rotate rotateX = new Rotate(0, Rotate.X_AXIS);
private final Rotate rotateY = new Rotate(0, Rotate.Y_AXIS);
private final Rotate rotateZ = new Rotate(0, Rotate.Z_AXIS);
private final Group root = new Group();
private final Group nodeGroup = new Group(); //all 3D nodes in scene
private final Group labelGroup = new Group(); //all generic 3D labels
//All shapes and labels linked via hash for easy update during camera movement
private final HashMap<Shape3D, Label> shape3DToLabel = new HashMap<>();
private SubScene subScene;
private final Random random = new Random();
private final static double RADIUS_MAX = 7;
private final static double X_MAX = 300;
private final static double Y_MAX = 300;
private final static double Z_MAX = 300;
public Pane createStarField() {
//attach our custom rotation transforms so we can update the labels dynamically
nodeGroup.getTransforms().addAll(rotateX, rotateY, rotateZ);
subScene = new SubScene(nodeGroup, sceneWidth, sceneHeight, true, SceneAntialiasing.BALANCED);
subScene.setFill(Color.BLACK);
PerspectiveCamera camera = new PerspectiveCamera(true);
camera.setNearClip(0.1);
camera.setFarClip(10000.0);
camera.setTranslateZ(-1000);
subScene.setCamera(camera);
Group sceneRoot = new Group(subScene);
sceneRoot.getChildren().add(labelGroup);
generateRandomStars(20);
subScene.setOnMousePressed((MouseEvent me) -> {
mousePosX = me.getSceneX();
mousePosY = me.getSceneY();
mouseOldX = me.getSceneX();
mouseOldY = me.getSceneY();
}
);
subScene.setOnMouseDragged((MouseEvent me) -> {
mouseOldX = mousePosX;
mouseOldY = mousePosY;
mousePosX = me.getSceneX();
mousePosY = me.getSceneY();
mouseDeltaX = (mousePosX - mouseOldX);
mouseDeltaY = (mousePosY - mouseOldY);
double modifier = 5.0;
double modifierFactor = 0.1;
if (me.isPrimaryButtonDown()) {
if (me.isAltDown()) { //roll
rotateZ.setAngle(((rotateZ.getAngle() + mouseDeltaX * modifierFactor * modifier * 2.0) % 360 + 540) % 360 - 180); // +
} else {
rotateY.setAngle(((rotateY.getAngle() + mouseDeltaX * modifierFactor * modifier * 2.0) % 360 + 540) % 360 - 180); // +
rotateX.setAngle(
clamp(
(((rotateX.getAngle() - mouseDeltaY * modifierFactor * modifier * 2.0) % 360 + 540) % 360 - 180),
-60,
60
)
); // -
}
}
updateLabels();
}
);
// add to the 2D portion of this component
Pane pane = new Pane();
pane.setPrefSize(sceneWidth, sceneHeight);
pane.setMaxSize(Pane.USE_COMPUTED_SIZE, Pane.USE_COMPUTED_SIZE);
pane.setMinSize(Pane.USE_COMPUTED_SIZE, Pane.USE_COMPUTED_SIZE);
pane.setBackground(Background.EMPTY);
pane.getChildren().add(sceneRoot);
pane.setPickOnBounds(false);
subScene.widthProperty().bind(pane.widthProperty());
subScene.heightProperty().bind(pane.heightProperty());
Platform.runLater(this::updateLabels);
return (pane);
}
public void generateRandomStars(int numberStars) {
for (int i = 0; i < numberStars; i++) {
double radius = random.nextDouble() * RADIUS_MAX;
Color color = randomColor();
double x = random.nextDouble() * X_MAX * 2 / 3 * (random.nextBoolean() ? 1 : -1);
double y = random.nextDouble() * Y_MAX * 2 / 3 * (random.nextBoolean() ? 1 : -1);
double z = random.nextDouble() * Z_MAX * 2 / 3 * (random.nextBoolean() ? 1 : -1);
String labelText = "Star " + i;
boolean fadeFlag = random.nextBoolean();
createSphereLabel(radius, x, y, z, color, labelText);
}
}
private Color randomColor() {
int r = random.nextInt(255);
int g = random.nextInt(255);
int b = random.nextInt(255);
return Color.rgb(r, g, b);
}
private void createSphereLabel(double radius, double x, double y, double z, Color color, String labelText) {
Sphere sphere = new Sphere(radius);
sphere.setTranslateX(x);
sphere.setTranslateY(y);
sphere.setTranslateZ(z);
sphere.setMaterial(new PhongMaterial(color));
//add our nodes to the group that will later be added to the 3D scene
nodeGroup.getChildren().add(sphere);
Label label = new Label(labelText);
label.setTextFill(color);
label.setFont(font);
labelGroup.getChildren().add(label);
//Add to hashmap so updateLabels() can manage the label position
shape3DToLabel.put(sphere, label);
}
private void updateLabels() {
shape3DToLabel.forEach((node, label) -> {
Point3D coordinates = node.localToScene(Point3D.ZERO, true);
//Clipping Logic
//if coordinates are outside of the scene it could
//stretch the screen so don't transform them
double x = coordinates.getX();
double y = coordinates.getY();
// is it left of the view?
if (x < 0) {
x = 0;
}
// is it right of the view?
if ((x + label.getWidth() + 5) > subScene.getWidth()) {
x = subScene.getWidth() - (label.getWidth() + 5);
}
// is it above the view?
if (y < 0) {
y = 0;
}
// is it below the view
if ((y + label.getHeight()) > subScene.getHeight()) {
y = subScene.getHeight() - (label.getHeight() + 5);
}
//update the local transform of the label.
label.getTransforms().setAll(new Translate(x, y));
});
}
//////////////////////////////////
@Override
public void start(Stage primaryStage) throws Exception {
Pane pane = createStarField();
root.getChildren().add(pane);
Scene scene = new Scene(root, sceneWidth, sceneHeight);
primaryStage.setTitle("2D Labels over 3D SubScene");
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
正如 Kleopatra 所建议的,我将代码包含在此处作为答案。
于是我四处寻找,在FXyz库包中找到了类似的解决方案。我修改它以适应我想要的,现在我有了我想要的工作版本。
我从 FXyz 中包含的唯一部分是 MathUtils 钳位静态方法。
import javafx.application.Application;
import javafx.application.Platform;
import javafx.geometry.Point3D;
import javafx.scene.*;
import javafx.scene.control.Label;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Background;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.paint.PhongMaterial;
import javafx.scene.shape.Shape3D;
import javafx.scene.shape.Sphere;
import javafx.scene.text.Font;
import javafx.scene.transform.Rotate;
import javafx.scene.transform.Translate;
import javafx.stage.Stage;
import java.util.HashMap;
import java.util.Random;
import static org.fxyz3d.geometry.MathUtils.clamp;
/**
* example for flat labels
*/
public class StarFieldExample extends Application {
final double sceneWidth = 600;
final double sceneHeight = 600;
private double mousePosX;
private double mousePosY;
private double mouseOldX;
private double mouseOldY;
private double mouseDeltaX;
private double mouseDeltaY;
private final Font font = new Font("arial", 10);
// We'll use custom Rotate transforms to manage the coordinate conversions
private final Rotate rotateX = new Rotate(0, Rotate.X_AXIS);
private final Rotate rotateY = new Rotate(0, Rotate.Y_AXIS);
private final Rotate rotateZ = new Rotate(0, Rotate.Z_AXIS);
private final Group root = new Group();
private final Group nodeGroup = new Group(); //all 3D nodes in scene
private final Group labelGroup = new Group(); //all generic 3D labels
//All shapes and labels linked via hash for easy update during camera movement
private final HashMap<Shape3D, Label> shape3DToLabel = new HashMap<>();
private SubScene subScene;
private final Random random = new Random();
private final static double RADIUS_MAX = 7;
private final static double X_MAX = 300;
private final static double Y_MAX = 300;
private final static double Z_MAX = 300;
public Pane createStarField() {
//attach our custom rotation transforms so we can update the labels dynamically
nodeGroup.getTransforms().addAll(rotateX, rotateY, rotateZ);
subScene = new SubScene(nodeGroup, sceneWidth, sceneHeight, true, SceneAntialiasing.BALANCED);
subScene.setFill(Color.BLACK);
PerspectiveCamera camera = new PerspectiveCamera(true);
camera.setNearClip(0.1);
camera.setFarClip(10000.0);
camera.setTranslateZ(-1000);
subScene.setCamera(camera);
Group sceneRoot = new Group(subScene);
sceneRoot.getChildren().add(labelGroup);
generateRandomStars(20);
subScene.setOnMousePressed((MouseEvent me) -> {
mousePosX = me.getSceneX();
mousePosY = me.getSceneY();
mouseOldX = me.getSceneX();
mouseOldY = me.getSceneY();
}
);
subScene.setOnMouseDragged((MouseEvent me) -> {
mouseOldX = mousePosX;
mouseOldY = mousePosY;
mousePosX = me.getSceneX();
mousePosY = me.getSceneY();
mouseDeltaX = (mousePosX - mouseOldX);
mouseDeltaY = (mousePosY - mouseOldY);
double modifier = 5.0;
double modifierFactor = 0.1;
if (me.isPrimaryButtonDown()) {
if (me.isAltDown()) { //roll
rotateZ.setAngle(((rotateZ.getAngle() + mouseDeltaX * modifierFactor * modifier * 2.0) % 360 + 540) % 360 - 180); // +
} else {
rotateY.setAngle(((rotateY.getAngle() + mouseDeltaX * modifierFactor * modifier * 2.0) % 360 + 540) % 360 - 180); // +
rotateX.setAngle(
clamp(
(((rotateX.getAngle() - mouseDeltaY * modifierFactor * modifier * 2.0) % 360 + 540) % 360 - 180),
-60,
60
)
); // -
}
}
updateLabels();
}
);
// add to the 2D portion of this component
Pane pane = new Pane();
pane.setPrefSize(sceneWidth, sceneHeight);
pane.setMaxSize(Pane.USE_COMPUTED_SIZE, Pane.USE_COMPUTED_SIZE);
pane.setMinSize(Pane.USE_COMPUTED_SIZE, Pane.USE_COMPUTED_SIZE);
pane.setBackground(Background.EMPTY);
pane.getChildren().add(sceneRoot);
pane.setPickOnBounds(false);
subScene.widthProperty().bind(pane.widthProperty());
subScene.heightProperty().bind(pane.heightProperty());
Platform.runLater(this::updateLabels);
return (pane);
}
public void generateRandomStars(int numberStars) {
for (int i = 0; i < numberStars; i++) {
double radius = random.nextDouble() * RADIUS_MAX;
Color color = randomColor();
double x = random.nextDouble() * X_MAX * 2 / 3 * (random.nextBoolean() ? 1 : -1);
double y = random.nextDouble() * Y_MAX * 2 / 3 * (random.nextBoolean() ? 1 : -1);
double z = random.nextDouble() * Z_MAX * 2 / 3 * (random.nextBoolean() ? 1 : -1);
String labelText = "Star " + i;
boolean fadeFlag = random.nextBoolean();
createSphereLabel(radius, x, y, z, color, labelText);
}
}
private Color randomColor() {
int r = random.nextInt(255);
int g = random.nextInt(255);
int b = random.nextInt(255);
return Color.rgb(r, g, b);
}
private void createSphereLabel(double radius, double x, double y, double z, Color color, String labelText) {
Sphere sphere = new Sphere(radius);
sphere.setTranslateX(x);
sphere.setTranslateY(y);
sphere.setTranslateZ(z);
sphere.setMaterial(new PhongMaterial(color));
//add our nodes to the group that will later be added to the 3D scene
nodeGroup.getChildren().add(sphere);
Label label = new Label(labelText);
label.setTextFill(color);
label.setFont(font);
labelGroup.getChildren().add(label);
//Add to hashmap so updateLabels() can manage the label position
shape3DToLabel.put(sphere, label);
}
private void updateLabels() {
shape3DToLabel.forEach((node, label) -> {
Point3D coordinates = node.localToScene(Point3D.ZERO, true);
//Clipping Logic
//if coordinates are outside of the scene it could
//stretch the screen so don't transform them
double x = coordinates.getX();
double y = coordinates.getY();
// is it left of the view?
if (x < 0) {
x = 0;
}
// is it right of the view?
if ((x + label.getWidth() + 5) > subScene.getWidth()) {
x = subScene.getWidth() - (label.getWidth() + 5);
}
// is it above the view?
if (y < 0) {
y = 0;
}
// is it below the view
if ((y + label.getHeight()) > subScene.getHeight()) {
y = subScene.getHeight() - (label.getHeight() + 5);
}
//update the local transform of the label.
label.getTransforms().setAll(new Translate(x, y));
});
}
//////////////////////////////////
@Override
public void start(Stage primaryStage) throws Exception {
Pane pane = createStarField();
root.getChildren().add(pane);
Scene scene = new Scene(root, sceneWidth, sceneHeight);
primaryStage.setTitle("2D Labels over 3D SubScene");
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
注意:我找到了一个解决方案并编辑了这个例子来展示如何去做。我将把这段代码移到我更大的应用程序中。
我编写了一个 3d 恒星图表应用程序,它接收 GAIA 恒星数据并向您显示 3d 表示。您可以查询和绘制基于查询的一组基于其属性的恒星对象。此应用程序旨在帮助科幻作家、爱好者想象 space.
地区的真实关系。当我构建视图时,我绘制了代表星星(半径、颜色等)的球体。
我为这些星星中的每一个都贴上了标签,以便用户可以识别出感兴趣的星星。
所以我的问题是,当我旋转视图(实际上是相机)时,标签会转动,用户会觉得这很不方便。那么如何在旋转视图时让它们面向相机呢?
一些细节。我保留两组。一个是绘制的所有星星,一个是标签。星星和标签都绘制在同一点上。分开组的原因是能够独立于星星打开和关闭标签(可用性问题)。
因此,当我旋转视野时,我想获取标签组并将每个标签转换为面向相机。
示例:(茎从赤道面投影到恒星,网格映射赤道面进行透视)
随着视图的转动:
这是工作示例。我找到了一个 FXyz 库示例并将其更改为执行我想要的操作。 FXyz 唯一使用的是 Mathutils.clamp(...).
import javafx.application.Application;
import javafx.application.Platform;
import javafx.geometry.Point3D;
import javafx.scene.*;
import javafx.scene.control.Label;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Background;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.paint.PhongMaterial;
import javafx.scene.shape.Shape3D;
import javafx.scene.shape.Sphere;
import javafx.scene.text.Font;
import javafx.scene.transform.Rotate;
import javafx.scene.transform.Translate;
import javafx.stage.Stage;
import java.util.HashMap;
import java.util.Random;
import static org.fxyz3d.geometry.MathUtils.clamp;
/**
* example for floating labels
*/
public class StarFieldExample extends Application {
final double sceneWidth = 600;
final double sceneHeight = 600;
private double mousePosX;
private double mousePosY;
private double mouseOldX;
private double mouseOldY;
private double mouseDeltaX;
private double mouseDeltaY;
private final Font font = new Font("arial", 10);
// We'll use custom Rotate transforms to manage the coordinate conversions
private final Rotate rotateX = new Rotate(0, Rotate.X_AXIS);
private final Rotate rotateY = new Rotate(0, Rotate.Y_AXIS);
private final Rotate rotateZ = new Rotate(0, Rotate.Z_AXIS);
private final Group root = new Group();
private final Group nodeGroup = new Group(); //all 3D nodes in scene
private final Group labelGroup = new Group(); //all generic 3D labels
//All shapes and labels linked via hash for easy update during camera movement
private final HashMap<Shape3D, Label> shape3DToLabel = new HashMap<>();
private SubScene subScene;
private final Random random = new Random();
private final static double RADIUS_MAX = 7;
private final static double X_MAX = 300;
private final static double Y_MAX = 300;
private final static double Z_MAX = 300;
public Pane createStarField() {
//attach our custom rotation transforms so we can update the labels dynamically
nodeGroup.getTransforms().addAll(rotateX, rotateY, rotateZ);
subScene = new SubScene(nodeGroup, sceneWidth, sceneHeight, true, SceneAntialiasing.BALANCED);
subScene.setFill(Color.BLACK);
PerspectiveCamera camera = new PerspectiveCamera(true);
camera.setNearClip(0.1);
camera.setFarClip(10000.0);
camera.setTranslateZ(-1000);
subScene.setCamera(camera);
Group sceneRoot = new Group(subScene);
sceneRoot.getChildren().add(labelGroup);
generateRandomStars(20);
subScene.setOnMousePressed((MouseEvent me) -> {
mousePosX = me.getSceneX();
mousePosY = me.getSceneY();
mouseOldX = me.getSceneX();
mouseOldY = me.getSceneY();
}
);
subScene.setOnMouseDragged((MouseEvent me) -> {
mouseOldX = mousePosX;
mouseOldY = mousePosY;
mousePosX = me.getSceneX();
mousePosY = me.getSceneY();
mouseDeltaX = (mousePosX - mouseOldX);
mouseDeltaY = (mousePosY - mouseOldY);
double modifier = 5.0;
double modifierFactor = 0.1;
if (me.isPrimaryButtonDown()) {
if (me.isAltDown()) { //roll
rotateZ.setAngle(((rotateZ.getAngle() + mouseDeltaX * modifierFactor * modifier * 2.0) % 360 + 540) % 360 - 180); // +
} else {
rotateY.setAngle(((rotateY.getAngle() + mouseDeltaX * modifierFactor * modifier * 2.0) % 360 + 540) % 360 - 180); // +
rotateX.setAngle(
clamp(
(((rotateX.getAngle() - mouseDeltaY * modifierFactor * modifier * 2.0) % 360 + 540) % 360 - 180),
-60,
60
)
); // -
}
}
updateLabels();
}
);
// add to the 2D portion of this component
Pane pane = new Pane();
pane.setPrefSize(sceneWidth, sceneHeight);
pane.setMaxSize(Pane.USE_COMPUTED_SIZE, Pane.USE_COMPUTED_SIZE);
pane.setMinSize(Pane.USE_COMPUTED_SIZE, Pane.USE_COMPUTED_SIZE);
pane.setBackground(Background.EMPTY);
pane.getChildren().add(sceneRoot);
pane.setPickOnBounds(false);
subScene.widthProperty().bind(pane.widthProperty());
subScene.heightProperty().bind(pane.heightProperty());
Platform.runLater(this::updateLabels);
return (pane);
}
public void generateRandomStars(int numberStars) {
for (int i = 0; i < numberStars; i++) {
double radius = random.nextDouble() * RADIUS_MAX;
Color color = randomColor();
double x = random.nextDouble() * X_MAX * 2 / 3 * (random.nextBoolean() ? 1 : -1);
double y = random.nextDouble() * Y_MAX * 2 / 3 * (random.nextBoolean() ? 1 : -1);
double z = random.nextDouble() * Z_MAX * 2 / 3 * (random.nextBoolean() ? 1 : -1);
String labelText = "Star " + i;
boolean fadeFlag = random.nextBoolean();
createSphereLabel(radius, x, y, z, color, labelText);
}
}
private Color randomColor() {
int r = random.nextInt(255);
int g = random.nextInt(255);
int b = random.nextInt(255);
return Color.rgb(r, g, b);
}
private void createSphereLabel(double radius, double x, double y, double z, Color color, String labelText) {
Sphere sphere = new Sphere(radius);
sphere.setTranslateX(x);
sphere.setTranslateY(y);
sphere.setTranslateZ(z);
sphere.setMaterial(new PhongMaterial(color));
//add our nodes to the group that will later be added to the 3D scene
nodeGroup.getChildren().add(sphere);
Label label = new Label(labelText);
label.setTextFill(color);
label.setFont(font);
labelGroup.getChildren().add(label);
//Add to hashmap so updateLabels() can manage the label position
shape3DToLabel.put(sphere, label);
}
private void updateLabels() {
shape3DToLabel.forEach((node, label) -> {
Point3D coordinates = node.localToScene(Point3D.ZERO, true);
//Clipping Logic
//if coordinates are outside of the scene it could
//stretch the screen so don't transform them
double x = coordinates.getX();
double y = coordinates.getY();
// is it left of the view?
if (x < 0) {
x = 0;
}
// is it right of the view?
if ((x + label.getWidth() + 5) > subScene.getWidth()) {
x = subScene.getWidth() - (label.getWidth() + 5);
}
// is it above the view?
if (y < 0) {
y = 0;
}
// is it below the view
if ((y + label.getHeight()) > subScene.getHeight()) {
y = subScene.getHeight() - (label.getHeight() + 5);
}
//update the local transform of the label.
label.getTransforms().setAll(new Translate(x, y));
});
}
//////////////////////////////////
@Override
public void start(Stage primaryStage) throws Exception {
Pane pane = createStarField();
root.getChildren().add(pane);
Scene scene = new Scene(root, sceneWidth, sceneHeight);
primaryStage.setTitle("2D Labels over 3D SubScene");
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
正如 Kleopatra 所建议的,我将代码包含在此处作为答案。
于是我四处寻找,在FXyz库包中找到了类似的解决方案。我修改它以适应我想要的,现在我有了我想要的工作版本。 我从 FXyz 中包含的唯一部分是 MathUtils 钳位静态方法。
import javafx.application.Application;
import javafx.application.Platform;
import javafx.geometry.Point3D;
import javafx.scene.*;
import javafx.scene.control.Label;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Background;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.paint.PhongMaterial;
import javafx.scene.shape.Shape3D;
import javafx.scene.shape.Sphere;
import javafx.scene.text.Font;
import javafx.scene.transform.Rotate;
import javafx.scene.transform.Translate;
import javafx.stage.Stage;
import java.util.HashMap;
import java.util.Random;
import static org.fxyz3d.geometry.MathUtils.clamp;
/**
* example for flat labels
*/
public class StarFieldExample extends Application {
final double sceneWidth = 600;
final double sceneHeight = 600;
private double mousePosX;
private double mousePosY;
private double mouseOldX;
private double mouseOldY;
private double mouseDeltaX;
private double mouseDeltaY;
private final Font font = new Font("arial", 10);
// We'll use custom Rotate transforms to manage the coordinate conversions
private final Rotate rotateX = new Rotate(0, Rotate.X_AXIS);
private final Rotate rotateY = new Rotate(0, Rotate.Y_AXIS);
private final Rotate rotateZ = new Rotate(0, Rotate.Z_AXIS);
private final Group root = new Group();
private final Group nodeGroup = new Group(); //all 3D nodes in scene
private final Group labelGroup = new Group(); //all generic 3D labels
//All shapes and labels linked via hash for easy update during camera movement
private final HashMap<Shape3D, Label> shape3DToLabel = new HashMap<>();
private SubScene subScene;
private final Random random = new Random();
private final static double RADIUS_MAX = 7;
private final static double X_MAX = 300;
private final static double Y_MAX = 300;
private final static double Z_MAX = 300;
public Pane createStarField() {
//attach our custom rotation transforms so we can update the labels dynamically
nodeGroup.getTransforms().addAll(rotateX, rotateY, rotateZ);
subScene = new SubScene(nodeGroup, sceneWidth, sceneHeight, true, SceneAntialiasing.BALANCED);
subScene.setFill(Color.BLACK);
PerspectiveCamera camera = new PerspectiveCamera(true);
camera.setNearClip(0.1);
camera.setFarClip(10000.0);
camera.setTranslateZ(-1000);
subScene.setCamera(camera);
Group sceneRoot = new Group(subScene);
sceneRoot.getChildren().add(labelGroup);
generateRandomStars(20);
subScene.setOnMousePressed((MouseEvent me) -> {
mousePosX = me.getSceneX();
mousePosY = me.getSceneY();
mouseOldX = me.getSceneX();
mouseOldY = me.getSceneY();
}
);
subScene.setOnMouseDragged((MouseEvent me) -> {
mouseOldX = mousePosX;
mouseOldY = mousePosY;
mousePosX = me.getSceneX();
mousePosY = me.getSceneY();
mouseDeltaX = (mousePosX - mouseOldX);
mouseDeltaY = (mousePosY - mouseOldY);
double modifier = 5.0;
double modifierFactor = 0.1;
if (me.isPrimaryButtonDown()) {
if (me.isAltDown()) { //roll
rotateZ.setAngle(((rotateZ.getAngle() + mouseDeltaX * modifierFactor * modifier * 2.0) % 360 + 540) % 360 - 180); // +
} else {
rotateY.setAngle(((rotateY.getAngle() + mouseDeltaX * modifierFactor * modifier * 2.0) % 360 + 540) % 360 - 180); // +
rotateX.setAngle(
clamp(
(((rotateX.getAngle() - mouseDeltaY * modifierFactor * modifier * 2.0) % 360 + 540) % 360 - 180),
-60,
60
)
); // -
}
}
updateLabels();
}
);
// add to the 2D portion of this component
Pane pane = new Pane();
pane.setPrefSize(sceneWidth, sceneHeight);
pane.setMaxSize(Pane.USE_COMPUTED_SIZE, Pane.USE_COMPUTED_SIZE);
pane.setMinSize(Pane.USE_COMPUTED_SIZE, Pane.USE_COMPUTED_SIZE);
pane.setBackground(Background.EMPTY);
pane.getChildren().add(sceneRoot);
pane.setPickOnBounds(false);
subScene.widthProperty().bind(pane.widthProperty());
subScene.heightProperty().bind(pane.heightProperty());
Platform.runLater(this::updateLabels);
return (pane);
}
public void generateRandomStars(int numberStars) {
for (int i = 0; i < numberStars; i++) {
double radius = random.nextDouble() * RADIUS_MAX;
Color color = randomColor();
double x = random.nextDouble() * X_MAX * 2 / 3 * (random.nextBoolean() ? 1 : -1);
double y = random.nextDouble() * Y_MAX * 2 / 3 * (random.nextBoolean() ? 1 : -1);
double z = random.nextDouble() * Z_MAX * 2 / 3 * (random.nextBoolean() ? 1 : -1);
String labelText = "Star " + i;
boolean fadeFlag = random.nextBoolean();
createSphereLabel(radius, x, y, z, color, labelText);
}
}
private Color randomColor() {
int r = random.nextInt(255);
int g = random.nextInt(255);
int b = random.nextInt(255);
return Color.rgb(r, g, b);
}
private void createSphereLabel(double radius, double x, double y, double z, Color color, String labelText) {
Sphere sphere = new Sphere(radius);
sphere.setTranslateX(x);
sphere.setTranslateY(y);
sphere.setTranslateZ(z);
sphere.setMaterial(new PhongMaterial(color));
//add our nodes to the group that will later be added to the 3D scene
nodeGroup.getChildren().add(sphere);
Label label = new Label(labelText);
label.setTextFill(color);
label.setFont(font);
labelGroup.getChildren().add(label);
//Add to hashmap so updateLabels() can manage the label position
shape3DToLabel.put(sphere, label);
}
private void updateLabels() {
shape3DToLabel.forEach((node, label) -> {
Point3D coordinates = node.localToScene(Point3D.ZERO, true);
//Clipping Logic
//if coordinates are outside of the scene it could
//stretch the screen so don't transform them
double x = coordinates.getX();
double y = coordinates.getY();
// is it left of the view?
if (x < 0) {
x = 0;
}
// is it right of the view?
if ((x + label.getWidth() + 5) > subScene.getWidth()) {
x = subScene.getWidth() - (label.getWidth() + 5);
}
// is it above the view?
if (y < 0) {
y = 0;
}
// is it below the view
if ((y + label.getHeight()) > subScene.getHeight()) {
y = subScene.getHeight() - (label.getHeight() + 5);
}
//update the local transform of the label.
label.getTransforms().setAll(new Translate(x, y));
});
}
//////////////////////////////////
@Override
public void start(Stage primaryStage) throws Exception {
Pane pane = createStarField();
root.getChildren().add(pane);
Scene scene = new Scene(root, sceneWidth, sceneHeight);
primaryStage.setTitle("2D Labels over 3D SubScene");
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}