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rework particles math

This commit is contained in:
Eduardo Bart 2011-12-15 17:59:24 -02:00
parent 1339e18202
commit 16bb12011a
6 changed files with 95 additions and 115 deletions
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2
TODO
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@ -39,3 +39,5 @@ use CoordsBuffer in font
cache into framebuffers
implement glbuffer for CoordsBuffer
use indices in CoordsBuffer
create a Timer class

6
modules/particle.otpa
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@ -9,7 +9,7 @@ ParticleSystem
particle-size: 8 8
particle-position-radius: 0
particle-velocity-angle: 360
particle-velocity-angle: 0
particle-acceleration: 0
particle-color: #22940684
@ -24,7 +24,7 @@ ParticleSystem
particle-size: 5 5
particle-position-radius: 0
particle-velocity-angle: 360
particle-acceleration-angle: 315
particle-velocity-angle: 0
particle-acceleration-angle: 90
particle-color: #ff0000ff
particle-texture: circle2.png

4
src/framework/core/clock.h
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@ -37,6 +37,10 @@ public:
ticks_t ticksElapsed(long prevTicks) { return ticks() - prevTicks; }
ticks_t ticksFor(int delay) { return ticks() + delay; }
double time() { return m_currentTicks/1000.0; }
double timeElapsed(double prevTime) { return time() - prevTime; }
double timeFor(double delay) { return time() + delay; }
private:
ticks_t m_currentTicks;
std::chrono::system_clock::time_point m_startupTime;

157
src/framework/graphics/particleemitter.cpp
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@ -26,24 +26,23 @@
#include <framework/graphics/texturemanager.h>
#include <framework/util/tools.h>
Particle::Particle(const Rect& rect, float vx, float vy, float ax, float ay, float duration, const Color& color, TexturePtr texture)
#define DEG_TO_RAD (acos(-1)/180.0)
Particle::Particle(const Point& pos, const Size& size, const PointF& velocity, const PointF& acceleration, float duration, const Color& color, TexturePtr texture)
{
m_rect = rect;
m_ix = rect.x(); m_iy = rect.y();
m_vx = vx; m_vy = vy;
m_ax = ax; m_ay = ay;
m_rect = Rect(pos, size);
m_pos = PointF(pos.x, pos.y);
m_size = size;
m_velocity = velocity;
m_acceleration = acceleration;
m_color = color;
m_texture = texture;
m_duration = duration;
m_startTicks = g_clock.ticks();
m_startTime = g_clock.time();
m_lastUpdateTime = g_clock.time();
m_finished = false;
}
Particle::~Particle()
{
//dump << "deleted";
}
void Particle::render()
{
g_painter.setColor(m_color);
@ -59,17 +58,24 @@ void Particle::render()
void Particle::update()
{
ticks_t t = g_clock.ticks() - m_startTicks;
float elapsedTime = g_clock.timeElapsed(m_lastUpdateTime);
m_lastUpdateTime = g_clock.time();
// check if finished
if(m_duration >= 0 && t > m_duration * 1000) {
if(m_duration > 0 && g_clock.timeElapsed(m_startTime) >= m_duration) {
m_finished = true;
return;
}
// update position
m_rect.moveTo(m_ix + (m_vx * t / 1000.0) + (m_ax * t*t / (2.0 * 1000 * 1000)),
m_iy + (m_vy * t / 1000.0) + (m_ay * t*t / (2.0 * 1000 * 1000)));
PointF delta = m_velocity * elapsedTime;
delta.y *= -1; // painter orientate Y axis in the inverse direction
m_pos += delta;
// update acceleration
m_velocity += m_acceleration * elapsedTime;
m_rect.moveTo((int)m_pos.x, (int)m_pos.y);
}
ParticleEmitter::ParticleEmitter()
@ -78,44 +84,41 @@ ParticleEmitter::ParticleEmitter()
m_duration = -1;
m_burstRate = 1; m_burstCount = 32;
m_currentBurst = 0;
m_startTicks = g_clock.ticks();
m_startTime = g_clock.time();
m_finished = false;
// particles default configuration. (make them reasonable for user detect missing properties on scripts)
m_pMinPositionRadius = 0; m_pMaxPositionRadius = 3;
m_pMinPositionAngle = -Fw::pi; m_pMaxPositionAngle = Fw::pi;
m_pMinSize = Size(32, 32); m_pMaxSize = Size(32, 32);
m_pMinDuration = 0; m_pMaxDuration = 10;
m_pMinVelocity = 32; m_pMaxVelocity = 64;
m_pMinVelocityAngle = -Fw::pi; m_pMaxVelocityAngle = Fw::pi;
m_pMinAcceleration = 32; m_pMaxAcceleration = 64;
m_pMinAccelerationAngle = -Fw::pi; m_pMaxAccelerationAngle = Fw::pi;
m_pColor = Color(255, 0, 0, 128);
m_pTexture = nullptr;
m_pMinPositionRadius = 0;
m_pMaxPositionRadius = 3;
m_pMinPositionAngle = 0;
m_pMaxPositionAngle = 360;
m_pMinSize = Size(32, 32);
m_pMaxSize = Size(32, 32);
m_pMinDuration = 0;
m_pMaxDuration = 10;
m_pMinVelocity = 32;
m_pMaxVelocity = 64;
m_pMinVelocityAngle = 0;
m_pMaxVelocityAngle = 360;
m_pMinAcceleration = 32;
m_pMaxAcceleration = 64;
m_pMinAccelerationAngle = 0;
m_pMaxAccelerationAngle = 360;
m_pColor = Color(255, 255, 255, 128);
}
bool ParticleEmitter::load(const OTMLNodePtr& node)
{
for(const OTMLNodePtr& childNode : node->children()) {
// self related
if(childNode->tag() == "position") {
std::string value = childNode->value();
std::vector<std::string> split;
boost::split(split, value, boost::is_any_of(std::string(" ")));
if(split.size() == 2)
m_position = Point(Fw::safeCast<int>(split[0]), Fw::safeCast<int>(split[1]));
}
if(childNode->tag() == "position")
m_position = childNode->value<Point>();
else if(childNode->tag() == "duration")
m_duration = childNode->value<float>();
else if(childNode->tag() == "burstRate")
m_burstRate = childNode->value<float>();
else if(childNode->tag() == "burstCount")
m_burstCount = childNode->value<int>();
// particles generation related
else if(childNode->tag() == "particle-position-radius") {
m_pMinPositionRadius = childNode->value<float>();
@ -125,15 +128,14 @@ bool ParticleEmitter::load(const OTMLNodePtr& node)
m_pMinPositionRadius = childNode->value<float>();
else if(childNode->tag() == "particle-max-position-radius")
m_pMaxPositionRadius = childNode->value<float>();
else if(childNode->tag() == "particle-position-angle") {
m_pMinPositionAngle = (childNode->value<float>() * Fw::pi / 180.0) - Fw::pi;
m_pMaxPositionAngle = (childNode->value<float>() * Fw::pi / 180.0) - Fw::pi;
m_pMinPositionAngle = childNode->value<float>() * DEG_TO_RAD;
m_pMaxPositionAngle = childNode->value<float>() * DEG_TO_RAD;
}
else if(childNode->tag() == "particle-min-position-angle")
m_pMinPositionAngle = (childNode->value<float>() * Fw::pi / 180.0) - Fw::pi;
m_pMinPositionAngle = childNode->value<float>() * DEG_TO_RAD;
else if(childNode->tag() == "particle-max-position-angle")
m_pMaxPositionAngle = (childNode->value<float>() * Fw::pi / 180.0) - Fw::pi;
m_pMaxPositionAngle = childNode->value<float>() * DEG_TO_RAD;
else if(childNode->tag() == "particle-velocity") {
m_pMinVelocity = childNode->value<float>();
@ -143,16 +145,14 @@ bool ParticleEmitter::load(const OTMLNodePtr& node)
m_pMinVelocity = childNode->value<float>();
else if(childNode->tag() == "particle-max-velocity")
m_pMaxVelocity = childNode->value<float>();
else if(childNode->tag() == "particle-velocity-angle") {
m_pMinVelocityAngle = (childNode->value<float>() * Fw::pi / 180.0) - Fw::pi;
m_pMaxVelocityAngle = (childNode->value<float>() * Fw::pi / 180.0) - Fw::pi;
m_pMinVelocityAngle = childNode->value<float>() * DEG_TO_RAD;
m_pMaxVelocityAngle = childNode->value<float>() * DEG_TO_RAD;
}
else if(childNode->tag() == "particle-min-velocity-angle")
m_pMinVelocityAngle = (childNode->value<float>() * Fw::pi / 180.0) - Fw::pi;
m_pMinVelocityAngle = childNode->value<float>() * DEG_TO_RAD;
else if(childNode->tag() == "particle-max-velocity-angle")
m_pMaxVelocityAngle = (childNode->value<float>() * Fw::pi / 180.0) - Fw::pi;
m_pMaxVelocityAngle = childNode->value<float>() * DEG_TO_RAD;
else if(childNode->tag() == "particle-acceleration") {
m_pMinAcceleration = childNode->value<float>();
m_pMaxAcceleration = childNode->value<float>();
@ -161,16 +161,14 @@ bool ParticleEmitter::load(const OTMLNodePtr& node)
m_pMinAcceleration = childNode->value<float>();
else if(childNode->tag() == "particle-max-acceleration")
m_pMaxAcceleration = childNode->value<float>();
else if(childNode->tag() == "particle-acceleration-angle") {
m_pMinAccelerationAngle = (childNode->value<float>() * Fw::pi / 180.0) - Fw::pi;
m_pMaxAccelerationAngle = (childNode->value<float>() * Fw::pi / 180.0) - Fw::pi;
m_pMinAccelerationAngle = childNode->value<float>() * DEG_TO_RAD;
m_pMaxAccelerationAngle = childNode->value<float>() * DEG_TO_RAD;
}
else if(childNode->tag() == "particle-min-acceleration-angle")
m_pMinAccelerationAngle = (childNode->value<float>() * Fw::pi / 180.0) - Fw::pi;
m_pMinAccelerationAngle = childNode->value<float>() * DEG_TO_RAD;
else if(childNode->tag() == "particle-max-acceleration-angle")
m_pMaxAccelerationAngle = (childNode->value<float>() * Fw::pi / 180.0) - Fw::pi;
m_pMaxAccelerationAngle = childNode->value<float>() * DEG_TO_RAD;
else if(childNode->tag() == "particle-duration") {
m_pMinDuration = childNode->value<float>();
m_pMaxDuration = childNode->value<float>();
@ -179,32 +177,14 @@ bool ParticleEmitter::load(const OTMLNodePtr& node)
m_pMinDuration = childNode->value<float>();
else if(childNode->tag() == "particle-max-duration")
m_pMaxDuration = childNode->value<float>();
else if(childNode->tag() == "particle-size") {
std::string value = childNode->value();
std::vector<std::string> split;
boost::split(split, value, boost::is_any_of(std::string(" ")));
if(split.size() == 2) {
m_pMinSize = Size(Fw::safeCast<int>(split[0]), Fw::safeCast<int>(split[1]));
m_pMaxSize = Size(Fw::safeCast<int>(split[0]), Fw::safeCast<int>(split[1]));
}
}
else if(childNode->tag() == "particle-min-size") {
std::string value = childNode->value();
std::vector<std::string> split;
boost::split(split, value, boost::is_any_of(std::string(" ")));
if(split.size() == 2) {
m_pMinSize = Size(Fw::safeCast<int>(split[0]), Fw::safeCast<int>(split[1]));
}
}
else if(childNode->tag() == "particle-max-size") {
std::string value = childNode->value();
std::vector<std::string> split;
boost::split(split, value, boost::is_any_of(std::string(" ")));
if(split.size() == 2) {
m_pMaxSize = Size(Fw::safeCast<int>(split[0]), Fw::safeCast<int>(split[1]));
}
m_pMinSize = childNode->value<Size>();
m_pMaxSize = childNode->value<Size>();
}
else if(childNode->tag() == "particle-min-size")
m_pMinSize = childNode->value<Size>();
else if(childNode->tag() == "particle-max-size")
m_pMaxSize = childNode->value<Size>();
else if(childNode->tag() == "particle-color")
m_pColor = childNode->value<Color>();
else if(childNode->tag() == "particle-texture")
@ -221,7 +201,7 @@ void ParticleEmitter::render()
void ParticleEmitter::update()
{
ticks_t elapsedTicks = g_clock.ticks() - m_startTicks;
float elapsedTime = g_clock.timeElapsed(m_startTime);
// update particles
for(auto it = m_particles.begin(), end = m_particles.end(); it != end;) {
@ -235,20 +215,20 @@ void ParticleEmitter::update()
}
// check if finished
if(m_duration >= 0 && elapsedTicks > m_duration * 1000) {
if(m_duration > 0 && elapsedTime > m_duration) {
// stop emitting but only self remove when there are no particles left
if(m_particles.size() == 0)
m_finished = true;
return;
}
int currentBurst = elapsedTicks / 1000.0 / m_burstRate + 1;
int currentBurst = (elapsedTime / m_burstRate) + 1;
for(int b = m_currentBurst; b < currentBurst; ++b) {
// every burst created at same position.
float pRadius = Fw::randomRange(m_pMinPositionRadius, m_pMaxPositionRadius);
float pAngle = Fw::randomRange(m_pMinPositionAngle, m_pMaxPositionAngle);
Point pPosition = Point(-pRadius * cos(pAngle), pRadius * sin(pAngle));
Point pPosition = m_position + Point(pRadius * cos(pAngle), pRadius * sin(pAngle));
for(int p = 0; p < m_burstCount; ++p) {
@ -256,17 +236,16 @@ void ParticleEmitter::update()
float pDuration = Fw::randomRange(m_pMinDuration, m_pMaxDuration);
// particles initial velocity
float pVelocity = Fw::randomRange(m_pMinVelocity, m_pMaxVelocity);
float pVelocityAbs = Fw::randomRange(m_pMinVelocity, m_pMaxVelocity);
float pVelocityAngle = Fw::randomRange(m_pMinVelocityAngle, m_pMaxVelocityAngle);
PointF pVelocity(pVelocityAbs * cos(pVelocityAngle), pVelocityAbs * sin(pVelocityAngle));
// particles initial acceleration
float pAcceleration = Fw::randomRange(m_pMinAcceleration, m_pMaxAcceleration);
float pAccelerationAbs = Fw::randomRange(m_pMinAcceleration, m_pMaxAcceleration);
float pAccelerationAngle = Fw::randomRange(m_pMinAccelerationAngle, m_pMaxAccelerationAngle);
PointF pAcceleration(pAccelerationAbs * cos(pAccelerationAngle), pAccelerationAbs * sin(pAccelerationAngle));
m_particles.push_back(ParticlePtr(new Particle(Rect(m_position + pPosition, pSize),
-pVelocity * cos(pVelocityAngle), pVelocity * sin(pVelocityAngle),
-pAcceleration * cos(pAccelerationAngle), pAcceleration * sin(pAccelerationAngle),
pDuration, m_pColor, m_pTexture)));
m_particles.push_back(ParticlePtr(new Particle(pPosition, pSize, pVelocity, pAcceleration, pDuration, m_pColor, m_pTexture)));
}
}

20
src/framework/graphics/particleemitter.h
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@ -29,9 +29,7 @@
class Particle {
public:
Particle(const Rect& rect, float vx, float vy, float ax, float ay, float duration, const Color& color = Color(255, 255, 255), TexturePtr texture = nullptr);
~Particle();
Particle(const Point& pos, const Size& size, const PointF& velocity, const PointF& acceleration, float duration, const Color& color = Fw::white, TexturePtr texture = nullptr);
void render();
void update();
@ -39,16 +37,16 @@ public:
bool hasFinished() { return m_finished; }
private:
Rect m_rect;
Color m_color;
TexturePtr m_texture;
int m_ix, m_iy;
float m_vx, m_vy;
float m_ax, m_ay;
PointF m_pos;
PointF m_velocity;
PointF m_acceleration;
Size m_size;
Rect m_rect;
float m_duration;
ticks_t m_startTicks;
double m_startTime;
double m_lastUpdateTime;
bool m_finished;
};
typedef std::shared_ptr<Particle> ParticlePtr;
@ -69,7 +67,7 @@ private:
// self related
Point m_position;
int m_duration;
ticks_t m_startTicks;
double m_startTime;
bool m_finished;
float m_burstRate;
int m_currentBurst, m_burstCount;

3
src/framework/graphics/particlemanager.cpp
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@ -28,9 +28,6 @@ ParticleManager g_particleManager;
bool ParticleManager::load(const std::string& filename)
{
if(!g_resources.fileExists(filename))
return false;
try {
OTMLDocumentPtr doc = OTMLDocument::parse(filename);
const OTMLNodePtr& node = doc->at("ParticleSystem");