/**
* Creates a spring between the two given nodes with the given strength. If the two nodes not
* directly connected by an edge already have a spring between them, it will be replaced by this
* one.
*
* @param node1 First of the two nodes to have a spring between them.
* @param node2 Second of the two nodes to have a spring between them.
* @param length The length of this spring (natural rest distance at which the two nodes would
* sit).
* @param strength The strength of this new spring.
* @return True if the viewer contains the two nodes and a spring between them has been created.
*/
public boolean addSpring(N node1, N node2, float length, float strength) {
Particle p1 = nodes.get(node1);
if (p1 == null) {
return false;
}
Particle p2 = nodes.get(node2);
if (p2 == null) {
return false;
}
// We may have to remove existing spring if it exists between these two nodes.
for (int i = 0; i < physics.getNumSprings(); i++) {
Spring spring = physics.getSpring(i);
if ((((spring.getOneEnd() == p1) && (spring.getTheOtherEnd() == p2))
|| ((spring.getOneEnd() == p2) && (spring.getTheOtherEnd() == p1)))
&& (spring.strength() != EDGE_STRENGTH)) {
physics.removeSpring(spring);
break;
}
}
// Add the new force.
physics.makeSpring(p1, p2, strength, DAMPING, length);
return false;
}
@Override
public void prepare(final ParticleSystem system) {
if (_wanderTargets.size() != system.getNumParticles()) {
_wanderTargets = new ArrayList<Vector3>(system.getNumParticles());
for (int x = system.getNumParticles(); --x >= 0; ) {
_wanderTargets.add(new Vector3(system.getEmissionDirection()).normalizeLocal());
}
}
}
/**
* Cause this particle to reset it's color, age and size per the parent's settings. status is set
* to Status.Available. Location, velocity and lifespan are set as given. Actual geometry data is
* not affected by this call, only particle params.
*
* @param velocity new initial particle velocity
* @param position new initial particle position
* @param lifeSpan new particle lifespan in ms
*/
public void init(
final ReadOnlyVector3 velocity, final ReadOnlyVector3 position, final double lifeSpan) {
this.lifeSpan = lifeSpan;
_velocity.set(velocity);
_position.set(position);
currColor.set(parent.getStartColor());
currentAge = 0;
status = Status.Available;
values[VAL_CURRENT_SIZE] = parent.getStartSize();
}
public void killParticle() {
setStatus(Status.Dead);
final Vector3 tempVec3 = Vector3.fetchTempInstance();
final FloatBuffer vertexBuffer = parent.getParticleGeometry().getMeshData().getVertexBuffer();
BufferUtils.populateFromBuffer(tempVec3, vertexBuffer, startIndex);
final int verts = ParticleSystem.getVertsForParticleType(type);
for (int x = 1; x < verts; x++) {
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + x);
}
Vector3.releaseTempInstance(tempVec3);
}
/**
* update position (using current position and velocity), color (interpolating between start and
* end color), size (interpolating between start and end size), spin (using parent's spin speed)
* and current age of particle. If this particle's age is greater than its lifespan, it is set to
* status DEAD.
*
* <p>Note that this only changes the parameters of the Particle, not the geometry the particle is
* associated with.
*
* @param secondsPassed number of seconds passed since last update.
* @return true if this particle is not ALIVE (in other words, if it is ready to be reused.)
*/
public boolean updateAndCheck(final double secondsPassed) {
if (status != Status.Alive) {
return true;
}
currentAge += secondsPassed * 1000; // add ms time to age
if (currentAge > lifeSpan) {
killParticle();
return true;
}
final Vector3 temp = Vector3.fetchTempInstance();
_position.addLocal(_velocity.multiply(secondsPassed * 1000f, temp));
Vector3.releaseTempInstance(temp);
// get interpolated values from appearance ramp:
parent.getRamp().getValuesAtAge(currentAge, lifeSpan, currColor, values, parent);
// interpolate colors
final int verts = ParticleSystem.getVertsForParticleType(type);
for (int x = 0; x < verts; x++) {
BufferUtils.setInBuffer(
currColor, parent.getParticleGeometry().getMeshData().getColorBuffer(), startIndex + x);
}
// check for tex animation
final int newTexIndex = parent.getTexAnimation().getTexIndexAtAge(currentAge, lifeSpan, parent);
// Update tex coords if applicable
if (currentTexIndex != newTexIndex) {
// Only supported in Quad type for now.
if (ParticleType.Quad.equals(parent.getParticleType())) {
// determine side
final float side = (float) Math.sqrt(parent.getTexQuantity());
int index = newTexIndex;
if (index >= parent.getTexQuantity()) {
index %= parent.getTexQuantity();
}
// figure row / col
final float row = side - (int) (index / side) - 1;
final float col = index % side;
// set texcoords
final float sU = col / side, eU = (col + 1) / side;
final float sV = row / side, eV = (row + 1) / side;
final FloatBuffer texs =
parent.getParticleGeometry().getMeshData().getTextureCoords(0).getBuffer();
texs.position(startIndex * 2);
texs.put(eU).put(sV);
texs.put(eU).put(eV);
texs.put(sU).put(eV);
texs.put(sU).put(sV);
texs.clear();
}
currentTexIndex = newTexIndex;
}
return false;
}
@Override
protected void onDraw(Canvas canvas) {
Paint paint = new Paint();
paint.setColor(Color.RED);
paint.setTextSize(40);
/*
* draw the background
*/
canvas.drawBitmap(mPool, 0, 0, null);
/*
* compute the new position of our object, based on accelerometer
* data and present time.
*/
final ParticleSystem particleSystem = mParticleSystem;
final long now = mSensorTimeStamp + (System.nanoTime() - mCpuTimeStamp);
final float sx = mSensorX;
final float sy = mSensorY;
particleSystem.update(sx, sy, now);
final float xc = mXOrigin;
final float yc = mYOrigin;
final float xs = mMetersToPixelsX;
final float ys = mMetersToPixelsY;
String scor = "score: " + score.toString();
// canvas.rotate(90);
canvas.drawText(scor, xc, yc, paint);
int i = 0;
for (Particle p : particleSystem.mBalls) {
/*
* We transform the canvas so that the coordinate system matches
* the sensors coordinate system with the origin in the center
* of the screen and the unit is the meter.
*/
i++;
final float x = xc + particleSystem.getPosX(i) * xs;
final float y = yc - particleSystem.getPosY(i) * ys;
canvas.drawBitmap(p.bitmap, x, y, null);
}
// and make sure to redraw asap
invalidate();
}
/**
* Reset particle conditions. Besides the passed lifespan, we also reset color, size, and spin
* angle to their starting values (as given by parent.) Status is set to Status.Available.
*
* @param lifeSpan the recreated particle's new lifespan
*/
public void recreateParticle(final double lifeSpan) {
this.lifeSpan = lifeSpan;
final int verts = ParticleSystem.getVertsForParticleType(type);
currColor.set(parent.getStartColor());
for (int x = 0; x < verts; x++) {
BufferUtils.setInBuffer(
currColor, parent.getParticleGeometry().getMeshData().getColorBuffer(), startIndex + x);
}
values[VAL_CURRENT_SIZE] = parent.getStartSize();
currentAge = 0;
values[VAL_CURRENT_MASS] = 1;
status = Status.Available;
}
/**
* Adds the given edge to those to be displayed in the viewer. Note that the edge must connect
* nodes that have already been added to the viewer. This version will use the locations of the
* two nodes to calculate their distance of separation.
*
* @param edge Edge to add to the display.
* @return True if edge was added successfully. False if edge contains nodes that have not been
* added to the viewer.
*/
public boolean addEdge(E edge) {
Particle p1 = nodes.get(edge.getNode1());
if (p1 == null) {
System.err.println("Warning: Node1 not found when creating edge.");
return false;
}
Particle p2 = nodes.get(edge.getNode2());
if (p2 == null) {
System.err.println("Warning: Node2 not found when creating edge.");
return false;
}
// Only add edge if it does not already exist in the collection
if (!edges.containsKey(edge)) {
float x1 = p1.position().x();
float y1 = p1.position().y();
float x2 = p2.position().x();
float y2 = p2.position().y();
// Strength, damping, reset length
edges.put(
edge,
physics.makeSpring(
p1,
p2,
EDGE_STRENGTH,
DAMPING,
(float) Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2))));
}
return true;
}
public void draw() {
background(255);
lights();
smooth();
ps.run();
}
@Override
protected void onDraw(Canvas canvas) {
/*
* draw the background
*/
// canvas.drawBitmap(mWood, 0, 0, null);
/*
* compute the new position of our object, based on accelerometer
* data and present time.
*/
final ParticleSystem particleSystem = mParticleSystem;
final long now = mSensorTimeStamp + (System.nanoTime() - mCpuTimeStamp);
final float sx = mSensorX;
final float sy = mSensorY;
particleSystem.update(sx, sy, now);
final float xc = mXOrigin;
final float yc = mYOrigin;
final float xs = mMetersToPixelsX;
final float ys = mMetersToPixelsY;
final Bitmap bitmap = mBitmap;
final int count = particleSystem.getParticleCount();
for (int i = 0; i < count; i++) {
/*
* We transform the canvas so that the coordinate system matches
* the sensors coordinate system with the origin in the center
* of the screen and the unit is the meter.
*/
final float x = xc + particleSystem.getPosX(i) * xs;
final float y = yc - particleSystem.getPosY(i) * ys;
canvas.drawBitmap(bitmap, x, y, mPaint);
}
// and make sure to redraw asap
invalidate();
}
/**
* Creates a attractive or repulsive force between the two given nodes. If the two nodes already
* have a force between them, it will be replaced by this one.
*
* @param node1 First of the two nodes to have a force between them.
* @param node2 Second of the two nodes to have a force between them.
* @param force Force to create between the two nodes. If positive, the nodes will attract each
* other, if negative they will repulse. The larger the magnitude the stronger the force.
* @param minDistance Minimum distance within which no force is applied.
* @return True if the viewer contains the two nodes and a force between them has been created.
*/
public boolean addForce(N node1, N node2, float force, float minDistance) {
Particle p1 = nodes.get(node1);
if (p1 == null) {
return false;
}
Particle p2 = nodes.get(node2);
if (p2 == null) {
return false;
}
// We may have to remove existing force if it exists between these two nodes.
for (int i = 0; i < physics.getNumAttractions(); i++) {
Attraction a = physics.getAttraction(i);
if (((a.getOneEnd() == p1) && (a.getTheOtherEnd() == p2))
|| ((a.getOneEnd() == p2) && (a.getTheOtherEnd() == p1))) {
physics.removeAttraction(a);
break;
}
}
// Add the new force.
physics.makeAttraction(p1, p2, force, minDistance);
return false;
}
/** Centres the particle view on the currently visible nodes. */
private void updateCentroid() {
float xMax = Float.NEGATIVE_INFINITY,
xMin = Float.POSITIVE_INFINITY,
yMin = Float.POSITIVE_INFINITY,
yMax = Float.NEGATIVE_INFINITY;
for (int i = 0; i < physics.getNumParticles(); ++i) {
Particle p = physics.getParticle(i);
xMax = Math.max(xMax, p.position().x());
xMin = Math.min(xMin, p.position().x());
yMin = Math.min(yMin, p.position().y());
yMax = Math.max(yMax, p.position().y());
}
float xRange = xMax - xMin;
float yRange = yMax - yMin;
if ((xRange == 0) && (yRange == 0)) {
xRange = Math.max(1, xMax);
yRange = Math.max(1, yMax);
}
float zScale = (float) Math.min(height / (yRange * 1.2), width / (xRange * 1.2));
centroid.setTarget(xMin + 0.5f * xRange, yMin + 0.5f * yRange, zScale);
}
/**
* Tethers the given node to its location with the given strength.
*
* @param node The node to be tethered.
* @param strength Strength of the tether.
* @return True if the viewer contains the given node and it was tethered successfully.
*/
public boolean tether(N node, float strength) {
Particle p1 = nodes.get(node);
if (p1 == null) {
return false;
}
// Grab the tethering stake if it has already been created, otherwise create a new one.
Particle stake = stakes.get(node);
if (stake == null) {
stake = physics.makeParticle(1, node.getLocation().x, node.getLocation().y, 0);
stake.makeFixed();
stakes.put(node, stake);
}
// Grab the tether if it has already been created, otherwise create a new one.
Spring tether = tethers.get(stake);
if (tether == null) {
tether = physics.makeSpring(stake, p1, strength, DAMPING, Float.MIN_VALUE);
tethers.put(stake, tether);
} else {
tether.setStrength(strength);
}
return true;
}
/**
* Adds the given edge to those to be displayed in the viewer. Note that the edge must connect
* nodes that have already been added to the viewer. This version will fix the distance of
* separation between nodes to the given value
*
* @param edge Edge to add to the display.
* @return True if edge was added successfully. False if edge contains nodes that have not been
* added to the viewer.
*/
public boolean addEdge(E edge, float distance) {
Particle p1 = nodes.get(edge.getNode1());
if (p1 == null) {
System.err.println("Warning: Node1 not found when creating edge.");
return false;
}
Particle p2 = nodes.get(edge.getNode2());
if (p2 == null) {
System.err.println("Warning: Node2 not found when creating edge.");
return false;
}
// Only add edge if it does not already exist in the collection
if (!edges.containsKey(edge)) {
// Strength, damping, reset length
edges.put(edge, physics.makeSpring(p1, p2, EDGE_STRENGTH, DAMPING, distance));
}
return true;
}
public void setup() {
mFont = createFont("ArialRoundedMTBold-36", 48);
size(1440, 900, OPENGL);
background(0);
frameRate(120);
// model = new OBJModel(this, "alyson_laugh.obj", "absolute", TRIANGLES);
model = new OBJModel(this, "alyson_scared.obj", "absolute", TRIANGLES);
// model = new OBJModel(this, "alyson_crying.obj", "absolute", TRIANGLES);
smooth();
colorMode(HSB);
strokeWeight(4);
model.scale(800);
model.translateToCenter();
detailValue = 3;
scaleValue = 10;
vertices = new ArrayList();
ps = new ParticleSystem(this, scaleValue);
PVector averagePosition = new PVector(0, 0, 0);
for (int i = 0; i < model.getVertexCount(); i += detailValue) {
PVector destinationPoint = model.getVertex(i);
vertices.add(destinationPoint);
averagePosition.add(destinationPoint);
}
averagePosition.div(vertices.size());
for (int i = 0; i < vertices.size(); i++) {
PVector destination = (PVector) vertices.get(i);
Particle p = new Particle(this, averagePosition, destination);
ps.addParticle(p);
}
}
/**
* Attempts to space out non-connected nodes from one another. This is achieved by adding a strong
* repulsive force between non-connected nodes. Note that this produces n-squared forces so can be
* slow for large networks where many nodes are not connected to each other.
*/
public void spaceNodes() {
ArrayList<Particle> pList = new ArrayList<Particle>(nodes.values());
for (int i = 0; i < pList.size(); i++) {
for (int j = 0; j < pList.size(); j++) {
if (i > j) {
Particle p1 = pList.get(i);
Particle p2 = pList.get(j);
// See if we have a connection between nodes
for (Spring spring : edges.values()) {
if (((spring.getOneEnd() == p1) && (spring.getTheOtherEnd() == p2))
|| ((spring.getOneEnd() == p2) && (spring.getTheOtherEnd() == p1))) {
// Do nothing as we already have an edge connecting these two particles
} else {
// Add a small repulsive force
physics.makeAttraction(p1, p2, -1000, 0.1f);
}
}
}
}
}
}
/**
* Updates the positions of nodes and edges in the viewer. This method does not normally need to
* be called as update happens every time draw() is called. Calling this method can be useful if
* you wish to speed up the movement of nodes and edges by updating their position more than once
* every draw cycle.
*/
public void updateParticles() {
physics.tick(0.3f); // Advance time in the physics engine.
}
/**
* Adds a node to those to be displayed in the viewer.
*
* @param node Node to add to the viewer.
*/
public void addNode(N node) {
Particle p = physics.makeParticle(1, node.getLocation().x, node.getLocation().y, 0);
nodes.put(node, p);
}
public void draw() {
background(0);
frame.setTitle(str((int) frameRate));
ps.update();
}
/**
* Update the vertices for this particle, taking size, spin and viewer into consideration. In the
* case of particle type ParticleType.GeomMesh, the original triangle normal is maintained rather
* than rotating it to face the camera or parent vectors.
*
* @param cam Camera to use in determining viewer aspect. If null, or if parent is not set to
* camera facing, parent's left and up vectors are used.
*/
public void updateVerts(final Camera cam) {
final double orient = parent.getParticleOrientation() + values[VAL_CURRENT_SPIN];
final double currSize = values[VAL_CURRENT_SIZE];
if (type == ParticleSystem.ParticleType.GeomMesh
|| type == ParticleSystem.ParticleType.Point) {; // nothing to do
} else if (cam != null && parent.isCameraFacing()) {
final ReadOnlyVector3 camUp = cam.getUp();
final ReadOnlyVector3 camLeft = cam.getLeft();
final ReadOnlyVector3 camDir = cam.getDirection();
if (parent.isVelocityAligned()) {
bbX.set(_velocity).normalizeLocal().multiplyLocal(currSize);
camDir.cross(bbX, bbY).normalizeLocal().multiplyLocal(currSize);
} else if (orient == 0) {
bbX.set(camLeft).multiplyLocal(currSize);
bbY.set(camUp).multiplyLocal(currSize);
} else {
final double cA = MathUtils.cos(orient) * currSize;
final double sA = MathUtils.sin(orient) * currSize;
bbX.set(camLeft)
.multiplyLocal(cA)
.addLocal(camUp.getX() * sA, camUp.getY() * sA, camUp.getZ() * sA);
bbY.set(camLeft)
.multiplyLocal(-sA)
.addLocal(camUp.getX() * cA, camUp.getY() * cA, camUp.getZ() * cA);
}
} else {
bbX.set(parent.getLeftVector()).multiplyLocal(0);
bbY.set(parent.getUpVector()).multiplyLocal(0);
}
final Vector3 tempVec3 = Vector3.fetchTempInstance();
final FloatBuffer vertexBuffer = parent.getParticleGeometry().getMeshData().getVertexBuffer();
switch (type) {
case Quad:
{
_position.subtract(bbX, tempVec3).subtractLocal(bbY);
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + 0);
_position.subtract(bbX, tempVec3).addLocal(bbY);
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + 1);
_position.add(bbX, tempVec3).addLocal(bbY);
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + 2);
_position.add(bbX, tempVec3).subtractLocal(bbY);
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + 3);
break;
}
case GeomMesh:
{
final Quaternion tempQuat = Quaternion.fetchTempInstance();
final ReadOnlyVector3 norm = triModel.getNormal();
if (orient != 0) {
tempQuat.fromAngleNormalAxis(orient, norm);
}
for (int x = 0; x < 3; x++) {
if (orient != 0) {
tempQuat.apply(triModel.get(x), tempVec3);
} else {
tempVec3.set(triModel.get(x));
}
tempVec3.multiplyLocal(currSize).addLocal(_position);
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + x);
}
Quaternion.releaseTempInstance(tempQuat);
break;
}
case Triangle:
{
_position
.subtract(3 * bbX.getX(), 3 * bbX.getY(), 3 * bbX.getZ(), tempVec3)
.subtractLocal(bbY);
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + 0);
_position.add(bbX, tempVec3).addLocal(3 * bbY.getX(), 3 * bbY.getY(), 3 * bbY.getZ());
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + 1);
_position.add(bbX, tempVec3).subtractLocal(bbY);
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + 2);
break;
}
case Line:
{
_position.subtract(bbX, tempVec3);
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex);
_position.add(bbX, tempVec3);
BufferUtils.setInBuffer(tempVec3, vertexBuffer, startIndex + 1);
break;
}
case Point:
{
BufferUtils.setInBuffer(_position, vertexBuffer, startIndex);
break;
}
}
Vector3.releaseTempInstance(tempVec3);
}
/**
* Cause this particle to reset it's lifespan, velocity, color, age and size per the parent's
* settings. status is set to Status.Available and location is set to 0,0,0. Actual geometry data
* is not affected by this call, only particle params.
*/
public void init() {
init(parent.getRandomVelocity(_velocity), Vector3.ZERO, parent.getRandomLifeSpan());
}
/**
* Normal use constructor. Sets up the parent and particle type for this particle.
*
* @param parent the particle collection this particle belongs to
*/
public Particle(final ParticleSystem parent) {
this.parent = parent;
type = parent.getParticleType();
}
@Override
public void prepare(final ParticleSystem system) {
super.prepare(system);
_swarmPoint.set(system.getOriginCenter()).addLocal(_swarmOffset);
}
/**
* Sets the drag on all particles in the system. By default drag is set to 0.75 which is enough to
* allow particles to move smoothly.
*
* @param drag Drag effect (larger numbers slow down movement).
*/
public void setDrag(float drag) {
physics.setDrag(drag);
}
