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The main purpose of this libraryis to modernize and maintain the slick2D library.
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package com.github.mathiewz.slick.particles;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import com.github.mathiewz.slick.Color;
import com.github.mathiewz.slick.Image;
import com.github.mathiewz.slick.SlickException;
import com.github.mathiewz.slick.geom.Vector2f;
import com.github.mathiewz.slick.util.FastTrig;
import com.github.mathiewz.slick.util.Log;
/**
* An emitter than can be externally configured. This configuration can also be
* saved/loaded using the ParticleIO class.
*
* @see ParticleIO
*
* @author kevin
*/
public class ConfigurableEmitter implements ParticleEmitter {
/** The path from which the images should be loaded */
private static String relativePath = "";
/**
* Set the path from which images should be loaded
*
* @param path
* The path from which images should be loaded
*/
public static void setRelativePath(String path) {
if (!path.endsWith("/")) {
path += "/";
}
relativePath = path;
}
/** The spawn interval range property - how often spawn happens */
public Range spawnInterval = new Range(100, 100);
/** The spawn count property - how many particles are spawned each time */
public Range spawnCount = new Range(5, 5);
/** The initial life of the new pixels */
public Range initialLife = new Range(1000, 1000);
/** The initial size of the new pixels */
public Range initialSize = new Range(10, 10);
/** The offset from the x position */
public Range xOffset = new Range(0, 0);
/** The offset from the y position */
public Range yOffset = new Range(0, 0);
/** The spread of the particles */
public RandomValue spread = new RandomValue(360);
/** The angular offset */
public SimpleValue angularOffset = new SimpleValue(0);
/** The initial distance of the particles */
public Range initialDistance = new Range(0, 0);
/** The speed particles fly out */
public Range speed = new Range(50, 50);
/** The growth factor on the particles */
public SimpleValue growthFactor = new SimpleValue(0);
/** The factor of gravity to apply */
public SimpleValue gravityFactor = new SimpleValue(0);
/** The factor of wind to apply */
public SimpleValue windFactor = new SimpleValue(0);
/** The length of the effect */
public Range length = new Range(1000, 1000);
/**
* The color range
*
* @see ColorRecord
*/
public ArrayList colors = new ArrayList<>();
/** The starting alpha value */
public SimpleValue startAlpha = new SimpleValue(255);
/** The ending alpha value */
public SimpleValue endAlpha = new SimpleValue(0);
/** Whiskas - Interpolated value for alpha */
public LinearInterpolator alpha;
/** Whiskas - Interpolated value for size */
public LinearInterpolator size;
/** Whiskas - Interpolated value for velocity */
public LinearInterpolator velocity;
/** Whiskas - Interpolated value for y axis scaling */
public LinearInterpolator scaleY;
/** The number of particles that will be emitted */
public Range emitCount = new Range(1000, 1000);
/** The points indicate */
public int usePoints = Particle.INHERIT_POINTS;
/** True if the quads should be orieted based on velocity */
public boolean useOriented = false;
/**
* True if the additivie blending mode should be used for particles owned by
* this emitter
*/
public boolean useAdditive = false;
/** The name attribute */
public String name;
/** The name of the image in use */
public String imageName = "";
/** The image being used for the particles */
private Image image;
/** True if the image needs updating */
private boolean updateImage;
/** True if the emitter is enabled */
private boolean enabled = true;
/** The x coordinate of the position of this emitter */
private float x;
/** The y coordinate of the position of this emitter */
private float y;
/** The time in milliseconds til the next spawn */
private int nextSpawn = 0;
/** The timeout counting down to spawn */
private int timeout;
/** The number of particles in use by this emitter */
private int particleCount;
/** The system this emitter is being updated to */
private ParticleSystem engine;
/** The number of particles that are left ot emit */
private int leftToEmit;
/** True if we're wrapping up */
protected boolean wrapUp = false;
/** True if the system has completed due to a wrap up */
protected boolean completed = false;
/** True if we need to adjust particles for movement */
protected boolean adjust;
/** The amount to adjust on the x axis */
protected float adjustx;
/** The amount to adjust on the y axis */
protected float adjusty;
/**
* Create a new emitter configurable externally
*
* @param name
* The name of emitter
*/
public ConfigurableEmitter(String name) {
this.name = name;
leftToEmit = (int) emitCount.random();
timeout = (int) length.random();
colors.add(new ColorRecord(0, Color.white));
colors.add(new ColorRecord(1, Color.red));
ArrayList curve = new ArrayList<>();
curve.add(new Vector2f(0.0f, 0.0f));
curve.add(new Vector2f(1.0f, 255.0f));
alpha = new LinearInterpolator(curve, 0, 255);
curve = new ArrayList<>();
curve.add(new Vector2f(0.0f, 0.0f));
curve.add(new Vector2f(1.0f, 255.0f));
size = new LinearInterpolator(curve, 0, 255);
curve = new ArrayList<>();
curve.add(new Vector2f(0.0f, 0.0f));
curve.add(new Vector2f(1.0f, 1.0f));
velocity = new LinearInterpolator(curve, 0, 1);
curve = new ArrayList<>();
curve.add(new Vector2f(0.0f, 0.0f));
curve.add(new Vector2f(1.0f, 1.0f));
scaleY = new LinearInterpolator(curve, 0, 1);
}
/**
* Set the name of the image to use on a per particle basis. The complete
* reference to the image is required (based on the relative path)
*
* @see #setRelativePath(String)
*
* @param imageName
* The name of the image to use on a per particle reference
*/
public void setImageName(String imageName) {
if (imageName.length() == 0) {
imageName = null;
}
this.imageName = imageName;
if (imageName == null) {
image = null;
} else {
updateImage = true;
}
}
/**
* The name of the image to load
*
* @return The name of the image to load
*/
public String getImageName() {
return imageName;
}
/**
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return "[" + name + "]";
}
/**
* Set the position of this particle source
*
* @param x
* The x coodinate of that this emitter should spawn at
* @param y
* The y coodinate of that this emitter should spawn at
*/
public void setPosition(float x, float y) {
setPosition(x, y, true);
}
/**
* Set the position of this particle source
*
* @param x
* The x coodinate of that this emitter should spawn at
* @param y
* The y coodinate of that this emitter should spawn at
* @param moveParticles
* True if particles should be moved with the emitter
*/
public void setPosition(float x, float y, boolean moveParticles) {
if (moveParticles) {
adjust = true;
adjustx -= this.x - x;
adjusty -= this.y - y;
}
this.x = x;
this.y = y;
}
/**
* Get the base x coordiante for spawning particles
*
* @return The x coordinate for spawning particles
*/
public float getX() {
return x;
}
/**
* Get the base y coordiante for spawning particles
*
* @return The y coordinate for spawning particles
*/
public float getY() {
return y;
}
/**
* @see com.github.mathiewz.slick.particles.ParticleEmitter#isEnabled()
*/
@Override
public boolean isEnabled() {
return enabled;
}
/**
* @see com.github.mathiewz.slick.particles.ParticleEmitter#setEnabled(boolean)
*/
@Override
public void setEnabled(boolean enabled) {
this.enabled = enabled;
}
/**
* @see com.github.mathiewz.slick.particles.ParticleEmitter#update(com.github.mathiewz.slick.particles.ParticleSystem,
* int)
*/
@Override
public void update(ParticleSystem system, int delta) {
engine = system;
if (!adjust) {
adjustx = 0;
adjusty = 0;
} else {
adjust = false;
}
if (updateImage) {
updateImage = false;
try {
image = new Image(relativePath + imageName);
} catch (SlickException e) {
image = null;
Log.error(e);
}
}
if (wrapUp || length.isEnabled() && timeout < 0 || emitCount.isEnabled() && leftToEmit <= 0) {
if (particleCount == 0) {
completed = true;
}
}
particleCount = 0;
if (wrapUp) {
return;
}
if (length.isEnabled()) {
if (timeout < 0) {
return;
}
timeout -= delta;
}
if (emitCount.isEnabled()) {
if (leftToEmit <= 0) {
return;
}
}
nextSpawn -= delta;
if (nextSpawn < 0) {
nextSpawn = (int) spawnInterval.random();
int count = (int) spawnCount.random();
for (int i = 0; i < count; i++) {
Particle p = system.getNewParticle(this, initialLife.random());
p.setSize(initialSize.random());
p.setPosition(x + xOffset.random(), y + yOffset.random());
p.setVelocity(0, 0, 0);
float dist = initialDistance.random();
float power = speed.random();
if (dist != 0 || power != 0) {
float s = spread.getValue(0);
float ang = s + angularOffset.getValue(0) - spread.getValue() / 2 - 90;
float xa = (float) FastTrig.cos(Math.toRadians(ang)) * dist;
float ya = (float) FastTrig.sin(Math.toRadians(ang)) * dist;
p.adjustPosition(xa, ya);
float xv = (float) FastTrig.cos(Math.toRadians(ang));
float yv = (float) FastTrig.sin(Math.toRadians(ang));
p.setVelocity(xv, yv, power * 0.001f);
}
if (image != null) {
p.setImage(image);
}
ColorRecord start = colors.get(0);
p.setColor(start.col.r, start.col.g, start.col.b, startAlpha.getValue(0) / 255.0f);
p.setUsePoint(usePoints);
p.setOriented(useOriented);
if (emitCount.isEnabled()) {
leftToEmit--;
if (leftToEmit <= 0) {
break;
}
}
}
}
}
/**
* @see com.github.mathiewz.slick.particles.ParticleEmitter#updateParticle(com.github.mathiewz.slick.particles.Particle,
* int)
*/
@Override
public void updateParticle(Particle particle, int delta) {
particleCount++;
// adjust the particles if required
particle.x += adjustx;
particle.y += adjusty;
particle.adjustVelocity(windFactor.getValue(0) * 0.00005f * delta, gravityFactor.getValue(0) * 0.00005f * delta);
float offset = particle.getLife() / particle.getOriginalLife();
float inv = 1 - offset;
float colOffset = 0;
float colInv = 1;
Color startColor = null;
Color endColor = null;
for (int i = 0; i < colors.size() - 1; i++) {
ColorRecord rec1 = colors.get(i);
ColorRecord rec2 = colors.get(i + 1);
if (inv >= rec1.pos && inv <= rec2.pos) {
startColor = rec1.col;
endColor = rec2.col;
float step = rec2.pos - rec1.pos;
colOffset = inv - rec1.pos;
colOffset /= step;
colOffset = 1 - colOffset;
colInv = 1 - colOffset;
}
}
if (startColor != null) {
float r = startColor.r * colOffset + endColor.r * colInv;
float g = startColor.g * colOffset + endColor.g * colInv;
float b = startColor.b * colOffset + endColor.b * colInv;
float a;
if (alpha.isActive()) {
a = alpha.getValue(inv) / 255.0f;
} else {
a = startAlpha.getValue(0) / 255.0f * offset + endAlpha.getValue(0) / 255.0f * inv;
}
particle.setColor(r, g, b, a);
}
if (size.isActive()) {
float s = size.getValue(inv);
particle.setSize(s);
} else {
particle.adjustSize(delta * growthFactor.getValue(0) * 0.001f);
}
if (velocity.isActive()) {
particle.setSpeed(velocity.getValue(inv));
}
if (scaleY.isActive()) {
particle.setScaleY(scaleY.getValue(inv));
}
}
/**
* Check if this emitter has completed it's cycle
*
* @return True if the emitter has completed it's cycle
*/
@Override
public boolean completed() {
if (engine == null) {
return false;
}
if (length.isEnabled()) {
if (timeout > 0) {
return false;
}
return completed;
}
if (emitCount.isEnabled()) {
if (leftToEmit > 0) {
return false;
}
return completed;
}
if (wrapUp) {
return completed;
}
return false;
}
/**
* Cause the emitter to replay it's circle
*/
public void replay() {
reset();
nextSpawn = 0;
leftToEmit = (int) emitCount.random();
timeout = (int) length.random();
}
/**
* Release all the particles held by this emitter
*/
public void reset() {
completed = false;
if (engine != null) {
engine.releaseAll(this);
}
}
/**
* Check if the replay has died out - used by the editor
*/
public void replayCheck() {
if (completed()) {
if (engine != null) {
if (engine.getParticleCount() == 0) {
replay();
}
}
}
}
/**
* Create a duplicate of this emitter.
* The duplicate should be added to a ParticleSystem to be used.
*
* @return a copy if no IOException occurred, null otherwise
*/
public ConfigurableEmitter duplicate() {
ConfigurableEmitter theCopy = null;
try {
ByteArrayOutputStream bout = new ByteArrayOutputStream();
ParticleIO.saveEmitter(bout, this);
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
theCopy = ParticleIO.loadEmitter(bin);
} catch (IOException e) {
Log.error("Slick: ConfigurableEmitter.duplicate(): caught exception " + e.toString());
return null;
}
return theCopy;
}
/**
* a general interface to provide a general value :]
*
* @author void
*/
public interface Value {
/**
* get the current value that might depend from the given time
*
* @param time
* @return the current value
*/
public float getValue(float time);
}
/**
* A configurable simple single value
*
* @author void
*/
public class SimpleValue implements Value {
/** The value configured */
private float value;
/**
* Create a new configurable new value
*
* @param value
* The initial value
*/
private SimpleValue(float value) {
this.value = value;
}
/**
* Get the currently configured value
*
* @return The currently configured value
*/
@Override
public float getValue(float time) {
return value;
}
/**
* Set the configured value
*
* @param value
* The configured value
*/
public void setValue(float value) {
this.value = value;
}
}
/**
* A configurable simple linear random value
*
* @author void
*/
public class RandomValue implements Value {
/** The value configured */
private float value;
/**
* Create a new configurable new value
*
* @param value
* The initial value
*/
private RandomValue(float value) {
this.value = value;
}
/**
* Get the currently configured value
*
* @return The currently configured value
*/
@Override
public float getValue(float time) {
return (float) (Math.random() * value);
}
/**
* Set the configured value
*
* @param value
* The configured value
*/
public void setValue(float value) {
this.value = value;
}
/**
* get the configured value
*
* @return the configured value
*/
public float getValue() {
return value;
}
}
/**
* A value computed based on linear interpolation between a set of points
*
* @author void
*/
public class LinearInterpolator implements Value {
/** The list of points to interpolate between */
private ArrayList curve;
/** True if this interpolation value is active */
private boolean active;
/** The minimum value in the data set */
private int min;
/** The maximum value in the data set */
private int max;
/**
* Create a new interpolated value
*
* @param curve
* The set of points to interpolate between
* @param min
* The minimum value in the dataset
* @param max
* The maximum value possible in the dataset
*/
public LinearInterpolator(ArrayList curve, int min, int max) {
this.curve = curve;
this.min = min;
this.max = max;
active = false;
}
/**
* Set the collection of data points to interpolate between
*
* @param curve
* The list of data points to interpolate between
*/
public void setCurve(ArrayList curve) {
this.curve = curve;
}
/**
* The list of data points to interpolate between
*
* @return A list of Vector2f of the data points to interpolate between
*/
public ArrayList getCurve() {
return curve;
}
/**
* Get the value to use at a given time value
*
* @param t
* The time value (expecting t in [0,1])
* @return The value to use at the specified time
*/
@Override
public float getValue(float t) {
// first: determine the segment we are in
Vector2f p0 = curve.get(0);
for (int i = 1; i < curve.size(); i++) {
Vector2f p1 = curve.get(i);
if (t >= p0.getX() && t <= p1.getX()) {
// found the segment
float st = (t - p0.getX()) / (p1.getX() - p0.getX());
float r = p0.getY() + st * (p1.getY() - p0.getY());
// System.out.println( "t: " + t + ", " + p0.x + ", " + p0.y
// + " : " + p1.x + ", " + p1.y + " => " + r );
return r;
}
p0 = p1;
}
return 0;
}
/**
* Check if this interpolated value should be used
*
* @return True if this value is in use
*/
public boolean isActive() {
return active;
}
/**
* Indicate if this interpoalte value should be used
*
* @param active
* True if this value should be used
*/
public void setActive(boolean active) {
this.active = active;
}
/**
* Get the maxmimum value possible in this data set
*
* @return The maximum value possible in this data set
*/
public int getMax() {
return max;
}
/**
* Set the maximum value possible in this data set
*
* @param max
* The maximum value possible in this data set
*/
public void setMax(int max) {
this.max = max;
}
/**
* Get the minimum value possible in this data set
*
* @return The minimum value possible in this data set
*/
public int getMin() {
return min;
}
/**
* Set the minimum value possible in this data set
*
* @param min
* The minimum value possible in this data set
*/
public void setMin(int min) {
this.min = min;
}
}
/**
* A single element in the colour range of this emitter
*
* @author kevin
*/
public class ColorRecord {
/** The position in the life cycle */
public float pos;
/** The color at this position */
public Color col;
/**
* Create a new record
*
* @param pos
* The position in the life cycle (0 = start, 1 = end)
* @param col
* The color applied at this position
*/
public ColorRecord(float pos, Color col) {
this.pos = pos;
this.col = col;
}
}
/**
* Add a point in the colour cycle
*
* @param pos
* The position in the life cycle (0 = start, 1 = end)
* @param col
* The color applied at this position
*/
public void addColorPoint(float pos, Color col) {
colors.add(new ColorRecord(pos, col));
}
/**
* A simple bean describing a range of values
*
* @author kevin
*/
public class Range {
/** The maximum value in the range */
private float max;
/** The minimum value in the range */
private float min;
/** True if this range application is enabled */
private boolean enabled = false;
/**
* Create a new configurable range
*
* @param min
* The minimum value of the range
* @param max
* The maximum value of the range
*/
private Range(float min, float max) {
this.min = min;
this.max = max;
}
/**
* Generate a random number in the range
*
* @return The random number from the range
*/
public float random() {
return (float) (min + Math.random() * (max - min));
}
/**
* Check if this configuration option is enabled
*
* @return True if the range is enabled
*/
public boolean isEnabled() {
return enabled;
}
/**
* Indicate if this option should be enabled
*
* @param enabled
* True if this option should be enabled
*/
public void setEnabled(boolean enabled) {
this.enabled = enabled;
}
/**
* Get the maximum value for this range
*
* @return The maximum value for this range
*/
public float getMax() {
return max;
}
/**
* Set the maxmium value for this range
*
* @param max
* The maximum value for this range
*/
public void setMax(float max) {
this.max = max;
}
/**
* Get the minimum value for this range
*
* @return The minimum value for this range
*/
public float getMin() {
return min;
}
/**
* Set the minimum value for this range
*
* @param min
* The minimum value for this range
*/
public void setMin(float min) {
this.min = min;
}
}
@Override
public boolean useAdditive() {
return useAdditive;
}
@Override
public boolean isOriented() {
return useOriented;
}
@Override
public boolean usePoints(ParticleSystem system) {
return usePoints == Particle.INHERIT_POINTS && system.usePoints() || usePoints == Particle.USE_POINTS;
}
@Override
public Image getImage() {
return image;
}
@Override
public void wrapUp() {
wrapUp = true;
}
@Override
public void resetState() {
wrapUp = false;
replay();
}
}
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