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/*
* Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package javafx.scene.shape;
import com.sun.javafx.geom.BaseBounds;
import com.sun.javafx.geom.PickRay;
import com.sun.javafx.geom.Vec3d;
import com.sun.javafx.geom.transform.BaseTransform;
import com.sun.javafx.scene.DirtyBits;
import com.sun.javafx.scene.NodeHelper;
import com.sun.javafx.scene.input.PickResultChooser;
import com.sun.javafx.scene.shape.MeshHelper;
import com.sun.javafx.scene.shape.SphereHelper;
import com.sun.javafx.sg.prism.NGNode;
import com.sun.javafx.sg.prism.NGSphere;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.geometry.Point2D;
import javafx.geometry.Point3D;
import javafx.scene.Node;
import javafx.scene.input.PickResult;
import javafx.scene.transform.Rotate;
/**
* The {@code Sphere} class defines a 3 dimensional sphere with the specified size.
* A {@code Sphere} is a 3D geometry primitive created with a given radius.
* It is centered at the origin.
*
* @since JavaFX 8.0
*/
public class Sphere extends Shape3D {
static {
// This is used by classes in different packages to get access to
// private and package private methods.
SphereHelper.setSphereAccessor(new SphereHelper.SphereAccessor() {
@Override
public NGNode doCreatePeer(Node node) {
return ((Sphere) node).doCreatePeer();
}
@Override
public void doUpdatePeer(Node node) {
((Sphere) node).doUpdatePeer();
}
@Override
public BaseBounds doComputeGeomBounds(Node node,
BaseBounds bounds, BaseTransform tx) {
return ((Sphere) node).doComputeGeomBounds(bounds, tx);
}
@Override
public boolean doComputeContains(Node node, double localX, double localY) {
return ((Sphere) node).doComputeContains(localX, localY);
}
@Override
public boolean doComputeIntersects(Node node, PickRay pickRay,
PickResultChooser pickResult) {
return ((Sphere) node).doComputeIntersects(pickRay, pickResult);
}
});
}
static final int DEFAULT_DIVISIONS = 64;
static final double DEFAULT_RADIUS = 1;
private int divisions = DEFAULT_DIVISIONS;
private TriangleMesh mesh;
/**
* Creates a new instance of {@code Sphere} with radius of 1.0.
* The resolution defaults to 64 divisions along the sphere's axes.
*/
public Sphere() {
this(DEFAULT_RADIUS, DEFAULT_DIVISIONS);
}
/**
* Creates a new instance of {@code Sphere} with the given radius.
* The resolution defaults to 64 divisions along the sphere's axes.
*
* @param radius Radius
*/
public Sphere(double radius) {
this(radius, DEFAULT_DIVISIONS);
}
/**
* Creates a new instance of {@code Sphere} with the given radius and number
* of divisions.
* The resolution is defined in terms of number of subdivisions along the
* sphere's axes. More divisions lead to more finely tesselated objects.
*
* Note that divisions should be at least 1. Any value less than that will be
* clamped to 1.
*
* @param radius Radius
* @param divisions Divisions
*/
public Sphere(double radius, int divisions) {
SphereHelper.initHelper(this);
this.divisions = divisions < 1 ? 1: divisions;
setRadius(radius);
}
/**
* Defines the radius of the Sphere.
*
* @defaultValue 1.0
*/
private DoubleProperty radius;
public final void setRadius(double value) {
radiusProperty().set(value);
}
public final double getRadius() {
return radius == null ? 1 : radius.get();
}
public final DoubleProperty radiusProperty() {
if (radius == null) {
radius = new SimpleDoubleProperty(Sphere.this, "radius", DEFAULT_RADIUS) {
@Override
public void invalidated() {
NodeHelper.markDirty(Sphere.this, DirtyBits.MESH_GEOM);
manager.invalidateSphereMesh(key);
key = null;
NodeHelper.geomChanged(Sphere.this);
}
};
}
return radius;
}
/**
* Retrieves the divisions attribute use to generate this sphere.
*
* @return the divisions attribute.
*/
public int getDivisions() {
return divisions;
}
/*
* Note: This method MUST only be called via its accessor method.
*/
private NGNode doCreatePeer() {
return new NGSphere();
}
/*
* Note: This method MUST only be called via its accessor method.
*/
private void doUpdatePeer() {
if (NodeHelper.isDirty(this, DirtyBits.MESH_GEOM)) {
final NGSphere pgSphere = NodeHelper.getPeer(this);
final float r = (float) getRadius();
if (r < 0) {
pgSphere.updateMesh(null);
} else {
if (key == null) {
key = new SphereKey(r, divisions);
}
mesh = manager.getSphereMesh(r, divisions, key);
mesh.updatePG();
pgSphere.updateMesh(mesh.getPGTriangleMesh());
}
}
}
/*
* Note: This method MUST only be called via its accessor method.
*/
private BaseBounds doComputeGeomBounds(BaseBounds bounds, BaseTransform tx) {
final float r = (float) getRadius();
if (r < 0) {
return bounds.makeEmpty();
}
bounds = bounds.deriveWithNewBounds(-r, -r, -r, r, r ,r);
bounds = tx.transform(bounds, bounds);
return bounds;
}
/*
* Note: This method MUST only be called via its accessor method.
*/
private boolean doComputeContains(double localX, double localY) {
double r = getRadius();
double n2 = localX * localX + localY * localY;
return n2 <= r * r;
}
/*
* Note: This method MUST only be called via its accessor method.
*/
private boolean doComputeIntersects(PickRay pickRay, PickResultChooser pickResult) {
final boolean exactPicking = divisions < DEFAULT_DIVISIONS && mesh != null;
final double r = getRadius();
final Vec3d dir = pickRay.getDirectionNoClone();
final double dirX = dir.x;
final double dirY = dir.y;
final double dirZ = dir.z;
final Vec3d origin = pickRay.getOriginNoClone();
final double originX = origin.x;
final double originY = origin.y;
final double originZ = origin.z;
// Coeficients of a quadratic equation desribing intersection with sphere
final double a = dirX * dirX + dirY * dirY + dirZ * dirZ;
final double b = 2 * (dirX * originX + dirY * originY + dirZ * originZ);
final double c = originX * originX + originY * originY + originZ * originZ - r * r;
final double discriminant = b * b - 4 * a * c;
if (discriminant < 0) {
// No real roots of the equation, missed the shape
return false;
}
final double distSqrt = Math.sqrt(discriminant);
final double q = (b < 0) ? (-b - distSqrt) / 2.0 : (-b + distSqrt) / 2.0;
double t0 = q / a;
double t1 = c / q;
if (t0 > t1) {
final double temp = t0;
t0 = t1;
t1 = temp;
}
final double minDistance = pickRay.getNearClip();
final double maxDistance = pickRay.getFarClip();
if (t1 < minDistance || t0 > maxDistance) {
// the sphere is out of clipping planes
return false;
}
double t = t0;
final CullFace cullFace = getCullFace();
if (t0 < minDistance || cullFace == CullFace.FRONT) {
if (t1 <= maxDistance && getCullFace() != CullFace.BACK) {
// picking the back wall
t = t1;
} else {
// we are inside the sphere with the back wall culled, but the
// exact picking still needs to be done because the front faced
// triangles may still be in front of us
if (!exactPicking) {
return false;
}
}
}
if (Double.isInfinite(t) || Double.isNaN(t)) {
// We've got a nonsense pick ray or sphere size.
return false;
}
if (exactPicking) {
return MeshHelper.computeIntersects(mesh, pickRay, pickResult, this, cullFace, false);
}
if (pickResult != null && pickResult.isCloser(t)) {
final Point3D point = PickResultChooser.computePoint(pickRay, t);
// computing texture coords
final Point3D proj = new Point3D(point.getX(), 0, point.getZ());
final Point3D cross = proj.crossProduct(Rotate.Z_AXIS);
double angle = proj.angle(Rotate.Z_AXIS);
if (cross.getY() > 0) {
angle = 360 - angle;
}
Point2D txtCoords = new Point2D(1 - angle / 360, 0.5 + point.getY() / (2 * r));
pickResult.offer(this, t, PickResult.FACE_UNDEFINED, point, txtCoords);
}
return true;
}
private static int correctDivisions(int div) {
return ((div + 3) / 4) * 4;
}
static TriangleMesh createMesh(int div, float r) {
div = correctDivisions(div);
// NOTE: still create mesh for degenerated sphere
final int div2 = div / 2;
final int nPoints = div * (div2 - 1) + 2;
final int nTPoints = (div + 1) * (div2 - 1) + div * 2;
final int nFaces = div * (div2 - 2) * 2 + div * 2;
final float rDiv = 1.f / div;
float points[] = new float[nPoints * 3];
float tPoints[] = new float[nTPoints * 2];
int faces[] = new int[nFaces * 6];
int pPos = 0, tPos = 0;
for (int y = 0; y < div2 - 1; ++y) {
float va = rDiv * (y + 1 - div2 / 2) * 2 * (float) Math.PI;
float sin_va = (float) Math.sin(va);
float cos_va = (float) Math.cos(va);
float ty = 0.5f + sin_va * 0.5f;
for (int i = 0; i < div; ++i) {
double a = rDiv * i * 2 * (float) Math.PI;
float hSin = (float) Math.sin(a);
float hCos = (float) Math.cos(a);
points[pPos + 0] = hSin * cos_va * r;
points[pPos + 2] = hCos * cos_va * r;
points[pPos + 1] = sin_va * r;
tPoints[tPos + 0] = 1 - rDiv * i;
tPoints[tPos + 1] = ty;
pPos += 3;
tPos += 2;
}
tPoints[tPos + 0] = 0;
tPoints[tPos + 1] = ty;
tPos += 2;
}
points[pPos + 0] = 0;
points[pPos + 1] = -r;
points[pPos + 2] = 0;
points[pPos + 3] = 0;
points[pPos + 4] = r;
points[pPos + 5] = 0;
pPos += 6;
int pS = (div2 - 1) * div;
float textureDelta = 1.f / 256;
for (int i = 0; i < div; ++i) {
tPoints[tPos + 0] = 1.0f - rDiv * (0.5f + i);
tPoints[tPos + 1] = textureDelta;
tPos += 2;
}
for (int i = 0; i < div; ++i) {
tPoints[tPos + 0] = 1.0f - rDiv * (0.5f + i);
tPoints[tPos + 1] = 1 - textureDelta;
tPos += 2;
}
int fIndex = 0;
for (int y = 0; y < div2 - 2; ++y) {
for (int x = 0; x < div; ++x) {
int p0 = y * div + x;
int p1 = p0 + 1;
int p2 = p0 + div;
int p3 = p1 + div;
int t0 = p0 + y;
int t1 = t0 + 1;
int t2 = t0 + (div + 1);
int t3 = t1 + (div + 1);
// add p0, p1, p2
faces[fIndex + 0] = p0;
faces[fIndex + 1] = t0;
faces[fIndex + 2] = p1 % div == 0 ? p1 - div : p1;
faces[fIndex + 3] = t1;
faces[fIndex + 4] = p2;
faces[fIndex + 5] = t2;
fIndex += 6;
// add p3, p2, p1
faces[fIndex + 0] = p3 % div == 0 ? p3 - div : p3;
faces[fIndex + 1] = t3;
faces[fIndex + 2] = p2;
faces[fIndex + 3] = t2;
faces[fIndex + 4] = p1 % div == 0 ? p1 - div : p1;
faces[fIndex + 5] = t1;
fIndex += 6;
}
}
int p0 = pS;
int tB = (div2 - 1) * (div + 1);
for (int x = 0; x < div; ++x) {
int p2 = x, p1 = x + 1, t0 = tB + x;
faces[fIndex + 0] = p0;
faces[fIndex + 1] = t0;
faces[fIndex + 2] = p1 == div ? 0 : p1;
faces[fIndex + 3] = p1;
faces[fIndex + 4] = p2;
faces[fIndex + 5] = p2;
fIndex += 6;
}
p0 = p0 + 1;
tB = tB + div;
int pB = (div2 - 2) * div;
for (int x = 0; x < div; ++x) {
int p1 = pB + x, p2 = pB + x + 1, t0 = tB + x;
int t1 = (div2 - 2) * (div + 1) + x, t2 = t1 + 1;
faces[fIndex + 0] = p0;
faces[fIndex + 1] = t0;
faces[fIndex + 2] = p1;
faces[fIndex + 3] = t1;
faces[fIndex + 4] = p2 % div == 0 ? p2 - div : p2;
faces[fIndex + 5] = t2;
fIndex += 6;
}
TriangleMesh m = new TriangleMesh(true);
m.getPoints().setAll(points);
m.getTexCoords().setAll(tPoints);
m.getFaces().setAll(faces);
return m;
}
private static class SphereKey extends Key {
final double radius;
final int divisions;
private SphereKey(double radius, int divisions) {
this.radius = radius;
this.divisions = divisions;
}
@Override
public int hashCode() {
long bits = 7L;
bits = 31L * bits + Double.doubleToLongBits(radius);
bits = 31L * bits + divisions;
return Long.hashCode(bits);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (!(obj instanceof SphereKey)) {
return false;
}
SphereKey other = (SphereKey) obj;
if (divisions != other.divisions) {
return false;
}
if (Double.compare(radius, other.radius) != 0) {
return false;
}
return true;
}
}
}
