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some changes to particles

This commit is contained in:
Henrique Santiago 2011-12-16 00:48:10 -02:00
parent ad38dad227
commit 26eb3b42a6
5 changed files with 66 additions and 46 deletions
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22
modules/particle.otpa
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@ -1,14 +1,14 @@
ParticleSystem
GoToPointAffector
AttractionAffector
destination: 150 150
Emitter
position: 100 100
burstRate: 2
burstRate: 99
burstCount: 1
particle-duration: 1
particle-duration: 999
particle-position-radius: 0
particle-velocity: 32
@ -20,3 +20,17 @@ ParticleSystem
particle-color: #ffff0044
particle-texture: circle2.png
Emitter
position: 150 150
burstRate: 99
burstCount: 1
particle-duration: 999
particle-position-radius: 0
particle-velocity: 0
particle-acceleration: 0
particle-size: 24 24
particle-color: #ffff0044
particle-texture: circle2.png

63
src/framework/graphics/particleaffector.cpp
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@ -24,43 +24,52 @@
#include "particleaffector.h"
#include <framework/core/clock.h>
void Gravity270Affector::update(const ParticlePtr& particle, double elapsedTime)
#define DEG_TO_RAD (acos(-1)/180.0)
bool GravityAffector::load(const OTMLNodePtr& node)
{
// earth gravity is 9.8 m/s². -> in tibia, 32 pixels are equal to 1 meter -> 32 pixels/m -> 9.8 * 32 is gravity constant
const float gravity = 9.8 * 32;
m_angle = 270 * DEG_TO_RAD;
m_gravity = 9.8;
PointF velocity = particle->getVelocity();
velocity += PointF(0, -gravity * elapsedTime);
particle->setVelocity(velocity);
}
void Gravity315Affector::update(const ParticlePtr& particle, double elapsedTime)
{
// earth gravity is 9.8 m/s². -> in tibia, 32 pixels are equal to 1 meter -> 32 pixels/m -> 9.8 * 32 is gravity constant
const float gravity = 9.8 * 32;
PointF velocity = particle->getVelocity();
velocity += PointF(gravity * elapsedTime * cos(7 * Fw::pi / 4), gravity * elapsedTime * sin(7 * Fw::pi / 4));
particle->setVelocity(velocity);
}
bool GoToPointAffector::load(const OTMLNodePtr& node)
{
for(const OTMLNodePtr& childNode : node->children()) {
if(childNode->tag() == "destination")
m_destination = childNode->value<Point>();
else if(childNode->tag() == "rotate-speed-percent")
m_rotateSpeedPercent = childNode->value<float>();
if(childNode->tag() == "angle")
m_angle = childNode->value<float>() * DEG_TO_RAD;
else if(childNode->tag() == "gravity")
m_gravity = childNode->value<float>();
}
return true;
}
void GoToPointAffector::update(const ParticlePtr& particle, double elapsedTime)
void GravityAffector::update(const ParticlePtr& particle, double elapsedTime)
{
PointF velocity = particle->getVelocity();
velocity += PointF(m_gravity * elapsedTime * cos(m_angle), m_gravity * elapsedTime * sin(m_angle));
particle->setVelocity(velocity);
}
bool AttractionAffector::load(const OTMLNodePtr& node)
{
m_acceleration = 32;
for(const OTMLNodePtr& childNode : node->children()) {
if(childNode->tag() == "destination")
m_destination = childNode->value<Point>();
else if(childNode->tag() == "acceleration")
m_acceleration = childNode->value<float>();
}
return true;
}
void AttractionAffector::update(const ParticlePtr& particle, double elapsedTime)
{
// must change velocity angle, keeping modulus.
PointF pPosition = particle->getPosition();
PointF d = PointF(m_destination.x - pPosition.x, pPosition.y - m_destination.y);
if(d.length() == 0)
return;
PointF pVelocity = particle->getVelocity();
particle->setVelocity(pVelocity + (d / d.length()) * m_acceleration * elapsedTime);
}

15
src/framework/graphics/particleaffector.h
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@ -32,24 +32,23 @@ public:
virtual void update(const ParticlePtr&, double) {}
};
class Gravity270Affector : public ParticleAffector {
class GravityAffector : public ParticleAffector {
public:
bool load(const OTMLNodePtr& node);
void update(const ParticlePtr& particle, double elapsedTime);
private:
float m_angle, m_gravity;
};
class Gravity315Affector : public ParticleAffector {
public:
void update(const ParticlePtr& particle, double elapsedTime);
};
class GoToPointAffector : public ParticleAffector {
class AttractionAffector : public ParticleAffector {
public:
bool load(const OTMLNodePtr& node);
void update(const ParticlePtr& particle, double elapsedTime);
private:
Point m_destination;
float m_rotateSpeedPercent;
float m_acceleration;
};
#endif

10
src/framework/graphics/particlesystem.cpp
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@ -41,12 +41,10 @@ bool ParticleSystem::load(const OTMLNodePtr& node)
else if(childNode->tag().find("Affector") != std::string::npos) {
ParticleAffectorPtr affector;
if(childNode->tag() == "Gravity270Affector")
affector = ParticleAffectorPtr(new Gravity270Affector);
else if(childNode->tag() == "Gravity315Affector")
affector = ParticleAffectorPtr(new Gravity315Affector);
else if(childNode->tag() == "GoToPointAffector")
affector = ParticleAffectorPtr(new GoToPointAffector);
if(childNode->tag() == "GravityAffector")
affector = ParticleAffectorPtr(new GravityAffector);
else if(childNode->tag() == "AttractionAffector")
affector = ParticleAffectorPtr(new AttractionAffector);
if(affector) {
affector->load(childNode);

2
src/framework/util/point.h
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@ -48,7 +48,7 @@ public:
TPoint<T>& operator-=(const TPoint<T>& other) { x-=other.x; y-=other.y; return *this; }
TPoint<T> operator*(const TPoint<T>& other) const { return TPoint<T>(x * other.x, y * other.y); }
TPoint<T>& operator*=(const TPoint<T>& other) { x*=other.x; y*=other.y; return *this; }
TPoint<T> operator*(const T v) const { return TPoint<T>(x * v, y * v); }
TPoint<T> operator*(const T v) const { return TPoint<T>(x*v, y*v); }
TPoint<T>& operator*=(const T v) { x*=v; y*=v; return *this; }
TPoint<T> operator/(const TPoint<T>& other) const { return TPoint<T>(x/other.x, y/other.y); }
TPoint<T>& operator/=(const TPoint<T>& other) { x/=other.x; y/=other.y; return *this; }