javafx.scene.Camera Maven / Gradle / Ivy
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package javafx.scene;
import javafx.beans.InvalidationListener;
import javafx.beans.Observable;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.geometry.Point2D;
import javafx.geometry.Point3D;
import javafx.scene.transform.Transform;
import com.sun.javafx.geom.BaseBounds;
import com.sun.javafx.geom.BoxBounds;
import com.sun.javafx.geom.PickRay;
import com.sun.javafx.geom.Vec3d;
import com.sun.javafx.geom.transform.Affine3D;
import com.sun.javafx.geom.transform.BaseTransform;
import com.sun.javafx.geom.transform.GeneralTransform3D;
import com.sun.javafx.geom.transform.NoninvertibleTransformException;
import com.sun.javafx.scene.CameraHelper;
import com.sun.javafx.scene.DirtyBits;
import com.sun.javafx.scene.NodeHelper;
import com.sun.javafx.scene.transform.TransformHelper;
import com.sun.javafx.sg.prism.NGCamera;
import com.sun.javafx.logging.PlatformLogger;
/**
* Base class for a camera used to render a scene.
* The camera defines the mapping of the scene coordinate space onto the window.
* Camera is an abstract class with two concrete subclasses:
* {@link ParallelCamera} and {@link PerspectiveCamera}.
*
*
* The default camera is positioned in the scene such that its projection plane
* in the scene coordinate space is at Z = 0, and it is looking into the screen in
* the positive Z direction. The distance in Z from the camera to the projection
* plane is determined by the {@code width} and {@code height} of the Scene to
* which it is attached and its {@code fieldOfView}.
*
*
*
* The {@code nearClip} and {@code farClip} of this camera are specified in the
* eye coordinate space. This space is defined such that the eye is at its
* origin and the projection plane is one unit in front of the eye in the
* positive Z direction.
*
*
*
* The following pseudo code is the math used to compute the near and far clip
* distances in the scene coordinate space:
*
*
*
* final double tanOfHalfFOV = Math.tan(Math.toRadians(FOV) / 2.0);
* final double halfHeight = HEIGHT / 2;
* final double focalLenght = halfHeight / tanOfHalfFOV;
* final double eyePositionZ = -1.0 * focalLenght;
* final double nearClipDistance = focalLenght * NEAR + eyePositionZ;
* final double farClipDistance = focalLenght * FAR + eyePositionZ;
*
*
*
* where {@code FOV} is {@code fieldOfView} in degrees,
* {@code NEAR} is {@code nearClip} specified in eye space,
* and {@code FAR} is {@code farClip} specified in eye space.
*
*
*
* Note: Since the ParallelCamera class has no {@code fieldOfView} property, a
* 30 degrees vertical field of view is used.
*
*
*
* Note: For the case of a PerspectiveCamera where the fixedEyeAtCameraZero
* attribute is true, the scene coordinate space is normalized in order to fit
* into the view frustum (see {@link PerspectiveCamera} for more details). In
* this mode, the eye coordinate space is the same as this Camera node's local
* coordinate space. Hence the conversion formula mentioned above is not used.
*
*
*
* An application should not extend the Camera class directly. Doing so may lead to
* an UnsupportedOperationException being thrown.
*
*
* @since JavaFX 2.0
*/
public abstract class Camera extends Node {
static {
// This is used by classes in different packages to get access to
// private and package private methods.
CameraHelper.setCameraAccessor(new CameraHelper.CameraAccessor() {
@Override
public void doMarkDirty(Node node, DirtyBits dirtyBit) {
((Camera) node).doMarkDirty(dirtyBit);
}
@Override
public void doUpdatePeer(Node node) {
((Camera) node).doUpdatePeer();
}
@Override
public BaseBounds doComputeGeomBounds(Node node,
BaseBounds bounds, BaseTransform tx) {
return ((Camera) node).doComputeGeomBounds(bounds, tx);
}
@Override
public boolean doComputeContains(Node node, double localX, double localY) {
return ((Camera) node).doComputeContains(localX, localY);
}
@Override
public Point2D project(Camera camera, Point3D p) {
return camera.project(p);
}
@Override
public Point2D pickNodeXYPlane(Camera camera, Node node, double x, double y) {
return camera.pickNodeXYPlane(node, x, y);
}
@Override
public Point3D pickProjectPlane(Camera camera, double x, double y) {
return camera.pickProjectPlane(x, y);
}
});
}
private Affine3D localToSceneTx = new Affine3D();
{
// To initialize the class helper at the begining each constructor of this class
CameraHelper.initHelper(this);
}
protected Camera() {
InvalidationListener dirtyTransformListener = observable
-> NodeHelper.markDirty(this, DirtyBits.NODE_CAMERA_TRANSFORM);
this.localToSceneTransformProperty().addListener(dirtyTransformListener);
// if camera is removed from scene it needs to stop using its transforms
this.sceneProperty().addListener(dirtyTransformListener);
}
// NOTE: farClipInScene and nearClipInScene are valid only if there is no rotation
private double farClipInScene;
private double nearClipInScene;
// only one of them can be non-null at a time
private Scene ownerScene = null;
private SubScene ownerSubScene = null;
private GeneralTransform3D projViewTx = new GeneralTransform3D();
private GeneralTransform3D projTx = new GeneralTransform3D();
private Affine3D viewTx = new Affine3D();
private double viewWidth = 1.0;
private double viewHeight = 1.0;
private Vec3d position = new Vec3d();
private boolean clipInSceneValid = false;
private boolean projViewTxValid = false;
private boolean localToSceneValid = false;
private boolean sceneToLocalValid = false;
double getFarClipInScene() {
updateClipPlane();
return farClipInScene;
}
double getNearClipInScene() {
updateClipPlane();
return nearClipInScene;
}
private void updateClipPlane() {
if (!clipInSceneValid) {
final Transform localToSceneTransform = getLocalToSceneTransform();
nearClipInScene = localToSceneTransform.transform(0, 0, getNearClip()).getZ();
farClipInScene = localToSceneTransform.transform(0, 0, getFarClip()).getZ();
clipInSceneValid = true;
}
}
/**
* An affine transform that holds the computed scene-to-local transform.
* It is used to convert node to camera coordinate when rotation is involved.
*/
private Affine3D sceneToLocalTx = new Affine3D();
Affine3D getSceneToLocalTransform() {
if (!sceneToLocalValid) {
sceneToLocalTx.setTransform(getCameraTransform());
try {
sceneToLocalTx.invert();
} catch (NoninvertibleTransformException ex) {
String logname = Camera.class.getName();
PlatformLogger.getLogger(logname).severe("getSceneToLocalTransform", ex);
sceneToLocalTx.setToIdentity();
}
sceneToLocalValid = true;
}
return sceneToLocalTx;
}
/**
* Specifies the distance from the eye of the near clipping plane of
* this {@code Camera} in the eye coordinate space.
* Objects closer to the eye than {@code nearClip} are not drawn.
* {@code nearClip} is specified as a value greater than zero. A value less
* than or equal to zero is treated as a very small positive number.
*
* @defaultValue 0.1
* @since JavaFX 8.0
*/
private DoubleProperty nearClip;
public final void setNearClip(double value){
nearClipProperty().set(value);
}
public final double getNearClip() {
return nearClip == null ? 0.1 : nearClip.get();
}
public final DoubleProperty nearClipProperty() {
if (nearClip == null) {
nearClip = new SimpleDoubleProperty(Camera.this, "nearClip", 0.1) {
@Override
protected void invalidated() {
clipInSceneValid = false;
NodeHelper.markDirty(Camera.this, DirtyBits.NODE_CAMERA);
}
};
}
return nearClip;
}
/**
* Specifies the distance from the eye of the far clipping plane of
* this {@code Camera} in the eye coordinate space.
* Objects farther away from the eye than {@code farClip} are not
* drawn.
* {@code farClip} is specified as a value greater than {@code nearClip}.
* A value less than or equal to {@code nearClip} is treated as
* {@code nearClip} plus a very small positive number.
*
* @defaultValue 100.0
* @since JavaFX 8.0
*/
private DoubleProperty farClip;
public final void setFarClip(double value){
farClipProperty().set(value);
}
public final double getFarClip() {
return farClip == null ? 100.0 : farClip.get();
}
public final DoubleProperty farClipProperty() {
if (farClip == null) {
farClip = new SimpleDoubleProperty(Camera.this, "farClip", 100.0) {
@Override
protected void invalidated() {
clipInSceneValid = false;
NodeHelper.markDirty(Camera.this, DirtyBits.NODE_CAMERA);
}
};
}
return farClip;
}
Camera copy() {
return this;
}
/*
* Note: This method MUST only be called via its accessor method.
*/
private void doUpdatePeer() {
NGCamera peer = getPeer();
if (!NodeHelper.isDirtyEmpty(this)) {
if (isDirty(DirtyBits.NODE_CAMERA)) {
peer.setNearClip((float) getNearClip());
peer.setFarClip((float) getFarClip());
peer.setViewWidth(getViewWidth());
peer.setViewHeight(getViewHeight());
}
if (isDirty(DirtyBits.NODE_CAMERA_TRANSFORM)) {
// TODO: 3D - For now, we are treating the scene as world.
// This may need to change for the fixed eye position case.
peer.setWorldTransform(getCameraTransform());
}
peer.setProjViewTransform(getProjViewTransform());
position = computePosition(position);
getCameraTransform().transform(position, position);
peer.setPosition(position);
}
}
void setViewWidth(double width) {
this.viewWidth = width;
NodeHelper.markDirty(this, DirtyBits.NODE_CAMERA);
}
double getViewWidth() {
return viewWidth;
}
void setViewHeight(double height) {
this.viewHeight = height;
NodeHelper.markDirty(this, DirtyBits.NODE_CAMERA);
}
double getViewHeight() {
return viewHeight;
}
void setOwnerScene(Scene s) {
if (s == null) {
ownerScene = null;
} else if (s != ownerScene) {
if (ownerScene != null || ownerSubScene != null) {
throw new IllegalArgumentException(this
+ "is already set as camera in other scene or subscene");
}
ownerScene = s;
markOwnerDirty();
}
}
void setOwnerSubScene(SubScene s) {
if (s == null) {
ownerSubScene = null;
} else if (s != ownerSubScene) {
if (ownerScene != null || ownerSubScene != null) {
throw new IllegalArgumentException(this
+ "is already set as camera in other scene or subscene");
}
ownerSubScene = s;
markOwnerDirty();
}
}
/*
* Note: This method MUST only be called via its accessor method.
*/
private void doMarkDirty(DirtyBits dirtyBit) {
if (dirtyBit == DirtyBits.NODE_CAMERA_TRANSFORM) {
localToSceneValid = false;
sceneToLocalValid = false;
clipInSceneValid = false;
projViewTxValid = false;
} else if (dirtyBit == DirtyBits.NODE_CAMERA) {
projViewTxValid = false;
}
markOwnerDirty();
}
private void markOwnerDirty() {
// if the camera is part of the scene/subScene, we will need to notify
// the owner to mark the entire scene/subScene dirty.
if (ownerScene != null) {
ownerScene.markCameraDirty();
}
if (ownerSubScene != null) {
ownerSubScene.markContentDirty();
}
}
/**
* Returns the local-to-scene transform of this camera.
* Package private, for use in our internal subclasses.
* Returns directly the internal instance, it must not be altered.
*/
Affine3D getCameraTransform() {
if (!localToSceneValid) {
localToSceneTx.setToIdentity();
TransformHelper.apply(getLocalToSceneTransform(), localToSceneTx);
localToSceneValid = true;
}
return localToSceneTx;
}
abstract void computeProjectionTransform(GeneralTransform3D proj);
abstract void computeViewTransform(Affine3D view);
/**
* Returns the projView transform of this camera.
* Package private, for internal use.
* Returns directly the internal instance, it must not be altered.
*/
GeneralTransform3D getProjViewTransform() {
if (!projViewTxValid) {
computeProjectionTransform(projTx);
computeViewTransform(viewTx);
projViewTx.set(projTx);
projViewTx.mul(viewTx);
projViewTx.mul(getSceneToLocalTransform());
projViewTxValid = true;
}
return projViewTx;
}
/**
* Transforms the given 3D point to the flat projected coordinates.
*/
private Point2D project(Point3D p) {
final Vec3d vec = getProjViewTransform().transform(new Vec3d(
p.getX(), p.getY(), p.getZ()));
final double halfViewWidth = getViewWidth() / 2.0;
final double halfViewHeight = getViewHeight() / 2.0;
return new Point2D(
halfViewWidth * (1 + vec.x),
halfViewHeight * (1 - vec.y));
}
/**
* Computes intersection point of the pick ray cast by the given coordinates
* and the node's local XY plane.
*/
private Point2D pickNodeXYPlane(Node node, double x, double y) {
final PickRay ray = computePickRay(x, y, null);
final Affine3D localToScene = new Affine3D();
TransformHelper.apply(node.getLocalToSceneTransform(), localToScene);
final Vec3d o = ray.getOriginNoClone();
final Vec3d d = ray.getDirectionNoClone();
try {
localToScene.inverseTransform(o, o);
localToScene.inverseDeltaTransform(d, d);
} catch (NoninvertibleTransformException e) {
return null;
}
if (almostZero(d.z)) {
return null;
}
final double t = -o.z / d.z;
return new Point2D(o.x + (d.x * t), o.y + (d.y * t));
}
/**
* Computes intersection point of the pick ray cast by the given coordinates
* and the projection plane.
*/
Point3D pickProjectPlane(double x, double y) {
final PickRay ray = computePickRay(x, y, null);
final Vec3d p = new Vec3d();
p.add(ray.getOriginNoClone(), ray.getDirectionNoClone());
return new Point3D(p.x, p.y, p.z);
}
/**
* Computes pick ray for the content rendered by this camera.
* @param x horizontal coordinate of the pick ray in the projected
* view, usually mouse cursor position
* @param y vertical coordinate of the pick ray in the projected
* view, usually mouse cursor position
* @param pickRay pick ray to be reused. New instance is created in case
* of null.
* @return The PickRay instance computed based on this camera and the given
* arguments.
*/
abstract PickRay computePickRay(double x, double y, PickRay pickRay);
/**
* Computes local position of the camera in the scene.
* @param position Position to be reused. New instance is created in case
* of null.
* @return The position of the camera in the scene in camera local coords
*/
abstract Vec3d computePosition(Vec3d position);
/*
* Note: This method MUST only be called via its accessor method.
*/
private BaseBounds doComputeGeomBounds(BaseBounds bounds, BaseTransform tx) {
return new BoxBounds(0, 0, 0, 0, 0, 0);
}
/*
* Note: This method MUST only be called via its accessor method.
*/
private boolean doComputeContains(double localX, double localY) {
return false;
}
}
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