javafx.scene.SpotLight Maven / Gradle / Ivy
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package javafx.scene;
import com.sun.javafx.scene.DirtyBits;
import com.sun.javafx.scene.NodeHelper;
import com.sun.javafx.scene.SpotLightHelper;
import com.sun.javafx.sg.prism.NGNode;
import com.sun.javafx.sg.prism.NGSpotLight;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.geometry.Point3D;
import javafx.scene.paint.Color;
import javafx.scene.paint.PhongMaterial;
/**
* A {@code SpotLight} is a {@code PointLight} that radiates light in a cone in a specific direction.
* The direction is defined by the {@link #directionProperty() direction} vector property of the light. The direction
* can be rotated by setting a rotation transform on the {@code SpotLight}. For example, if the direction vector is
* {@code (1, 1, 1)} and the light is not rotated, it will point in the {@code (1, 1, 1)} direction, and if the light is
* rotated 90 degrees on the y axis, it will point in the {@code (1, 1, -1)} direction.
*
* In addition to the factors that control the light intensity of a {@code PointLight}, a {@code SpotLight} has a
* light-cone attenuation factor, {@code spot}, that is determined by 3 properties:
*
* - {@link #innerAngleProperty() innerAngle}: the angle of the inner cone (see image below)
*
- {@link #outerAngleProperty() outerAngle}: the angle of the outer cone (see image below)
*
- {@link #falloffProperty() falloff}: the factor that controls the light's intensity drop inside the outer cone
*
* The valid ranges for these properties are {@code 0 <= innerAngle <= outerAngle <= 180} and {@code falloff >= 0};
* values outside either of these ranges can produce unexpected results.
*
* The angle of a point to the light is defined as the angle between its vector to the light's position and the
* direction of the light. For such an angle {@code theta}, if
*
* - {@code theta < innerAngle} then {@code spot = 1}
*
- {@code theta > outerAngle} then {@code spot = 0}
*
- {@code innerAngle <= theta <= outerAngle} then
*
*
spot = pow((cos(theta) - cos(outer)) / (cos(inner) - cos(outer)), falloff)
*
* which represents a drop in intensity from the inner angle to the outer angle.
*
* As a result, {@code 0 <= spot <= 1}. The overall intensity of the light is {@code I = lambert * atten * spot}.
*
* 
*
* @since 17
* @see PhongMaterial
*/
public class SpotLight extends PointLight {
static {
SpotLightHelper.setSpotLightAccessor(new SpotLightHelper.SpotLightAccessor() {
@Override
public NGNode doCreatePeer(Node node) {
return ((SpotLight) node).doCreatePeer();
}
@Override
public void doUpdatePeer(Node node) {
((SpotLight) node).doUpdatePeer();
}
});
}
{
// To initialize the class helper at the beginning of each constructor of this class
SpotLightHelper.initHelper(this);
}
/**
* Creates a new instance of {@code SpotLight} class with a default {@code Color.WHITE} light source.
*/
public SpotLight() {
super();
}
/**
* Creates a new instance of {@code SpotLight} class using the specified color.
*
* @param color the color of the light source
*/
public SpotLight(Color color) {
super(color);
}
/**
* The direction vector of the spotlight. It can be rotated by setting a rotation transform on the
* {@code SpotLight}. The vector need not be normalized.
*
* @defaultValue {@code Point3D(0, 0, 1)}
*/
private ObjectProperty direction;
public final void setDirection(Point3D value) {
directionProperty().set(value);
}
private static final Point3D DEFAULT_DIRECTION = NGSpotLight.getDefaultDirection();
public final Point3D getDirection() {
return direction == null ? DEFAULT_DIRECTION : direction.get();
}
public final ObjectProperty directionProperty() {
if (direction == null) {
direction = new SimpleObjectProperty<>(this, "direction", DEFAULT_DIRECTION) {
@Override
protected void invalidated() {
NodeHelper.markDirty(SpotLight.this, DirtyBits.NODE_LIGHT);
}
};
}
return direction;
}
/**
* The angle of the spotlight's inner cone, in degrees. A point whose angle to the light is less than this angle is
* not attenuated by the spotlight factor ({@code spot = 1}). At larger angles, the light intensity starts to drop.
* See the class doc for more information.
*
* The valid range is {@code 0 <= innerAngle <= outerAngle}; values outside of this range can produce unexpected
* results.
*
* @defaultValue 0
*/
private DoubleProperty innerAngle;
public final void setInnerAngle(double value) {
innerAngleProperty().set(value);
}
private static final double DEFAULT_INNER_ANGLE = NGSpotLight.getDefaultInnerAngle();
public final double getInnerAngle() {
return innerAngle == null ? DEFAULT_INNER_ANGLE : innerAngle.get();
}
public final DoubleProperty innerAngleProperty() {
if (innerAngle == null) {
innerAngle = getLightDoubleProperty("innerAngle", DEFAULT_INNER_ANGLE);
}
return innerAngle;
}
/**
* The angle of the spotlight's outer cone, in degrees (as shown in the class doc image). A point whose angle to the
* light is greater than this angle receives no light ({@code spot = 0}). A point whose angle to the light is less
* than the outer angle but greater than the inner angle receives partial intensity governed by the falloff factor.
* See the class doc for more information.
*
* The valid range is {@code innerAngle <= outerAngle <= 180}; values outside of this range can produce unexpected
* results.
*
* @defaultValue 30
*/
private DoubleProperty outerAngle;
public final void setOuterAngle(double value) {
outerAngleProperty().set(value);
}
private static final double DEFAULT_OUTER_ANGLE = NGSpotLight.getDefaultOuterAngle();
public final double getOuterAngle() {
return outerAngle == null ? DEFAULT_OUTER_ANGLE : outerAngle.get();
}
public final DoubleProperty outerAngleProperty() {
if (outerAngle == null) {
outerAngle = getLightDoubleProperty("outerAngle", DEFAULT_OUTER_ANGLE);
}
return outerAngle;
}
/**
* The intensity falloff factor of the spotlight's outer cone. A point whose angle to the light is
* greater than the inner angle but less than the outer angle receives partial intensity governed by this factor.
* The larger the falloff, the sharper the drop in intensity from the inner cone. A falloff factor of 1 gives a
* linear drop in intensity, values greater than 1 give a convex drop, and values smaller than 1 give a concave
* drop. See the class doc for more information.
*
* The valid range is {@code 0 <= falloff}; values outside of this range can produce unexpected results.
*
* @defaultValue 1
*/
private DoubleProperty falloff;
public final void setFalloff(double value) {
falloffProperty().set(value);
}
private static final double DEFAULT_FALLOFF = NGSpotLight.getDefaultFalloff();
public final double getFalloff() {
return falloff == null ? DEFAULT_FALLOFF : falloff.get();
}
public final DoubleProperty falloffProperty() {
if (falloff == null) {
falloff = getLightDoubleProperty("falloff", DEFAULT_FALLOFF);
}
return falloff;
}
/*
* Note: This method MUST only be called via its accessor method.
*/
private NGNode doCreatePeer() {
return new NGSpotLight();
}
private void doUpdatePeer() {
if (isDirty(DirtyBits.NODE_LIGHT)) {
NGSpotLight peer = getPeer();
peer.setDirection(getDirection());
peer.setInnerAngle((float) getInnerAngle());
peer.setOuterAngle((float) getOuterAngle());
peer.setFalloff((float) getFalloff());
}
}
}