void setColoursByAcceleration() {
int i;
particle_t *p, *plast;
particleDetail_t *pd;
float d;
float accMax = 0;
float accCurrent;
float velSpeed1;
float velSpeed2;
VectorNew(zero);
VectorZero(zero);
if (state.currentFrame == 0)
return;
for (i = 0; i < state.particleCount; i++) {
p = getParticleCurrentFrame(i);
plast = state.particleHistory + state.particleCount * (state.currentFrame-1) + i;
distance(zero, p->vel, velSpeed1);
distance(p->vel, plast->vel, velSpeed2);
accCurrent = abs(velSpeed2 - velSpeed1);
if (i == 0) {
accMax = accCurrent;
} else {
if (accCurrent > accMax)
accMax = accCurrent;
}
}
for (i = 0; i < state.particleCount; i++) {
p = getParticleCurrentFrame(i);
plast = state.particleHistory + state.particleCount * (state.currentFrame-1) + i;
distance(zero, p->vel, velSpeed1);
distance(p->vel, plast->vel, velSpeed2);
accCurrent = velSpeed2 - velSpeed1;
pd = getParticleDetail(i);
d = accCurrent / accMax;
colourFromNormal(pd->col, (float)fabs((double)d));
pd->particleSprite = colourSprite(pd->col, pd->mass);
}
}
void setColoursByMass() {
int i;
particle_t *p;
particleDetail_t *pd;
float d;
for (i = 0; i < state.particleCount; i++) {
p = getParticleCurrentFrame(i);
pd = getParticleDetail(i);
if (i == 0) {
state.massRange[0] = pd->mass;
state.massRange[1] = pd->mass;
} else {
if (pd->mass < state.massRange[0])
state.massRange[0] = pd->mass;
if (pd->mass > state.massRange[1])
state.massRange[1] = pd->mass;
}
}
for (i = 0; i < state.particleCount; i++) {
p = getParticleCurrentFrame(i);
pd = getParticleDetail(i);
d = pd->mass / state.massRange[1];
colourFromNormal(pd->col, (float)fabs(d));
if (d < 0) {
pd->col[0] = 1 - pd->col[0];
pd->col[1] = 1 - pd->col[1];
pd->col[2] = 1 - pd->col[2];
}
pd->particleSprite = colourSprite(pd->col, pd->mass);
}
}
void setColoursByKinetic() {
int i;
particle_t *p;
particleDetail_t *pd;
float d;
float kinMax = 0;
float kinValue;
float velocity;
VectorNew(zero);
VectorZero(zero);
for (i = 0; i < state.particleCount; i++) {
p = getParticleCurrentFrame(i);
pd = getParticleDetail(i);
distance(zero, p->vel, velocity);
velocity = fabs(velocity);
kinValue = velocity * velocity * pd->mass * 0.5;
if (i == 0) {
kinMax = kinValue;
} else {
if (kinValue > kinMax)
kinMax = kinValue;
}
}
for (i = 0; i < state.particleCount; i++) {
p = getParticleFirstFrame(i);
pd = getParticleDetail(i);
distance(zero, p->vel, velocity);
kinValue = velocity * velocity * pd->mass * 0.5;
d = kinValue / kinMax;
colourFromNormal(pd->col, (float)fabs((double)d));
pd->particleSprite = colourSprite(pd->col, pd->mass);
}
}
void translateToCenter() {
int i;
particle_t *p;
VectorNew(pos);
VectorZero(pos);
for (i = 0; i < state.particleCount; i++) {
p = getParticleCurrentFrame(i);
VectorAdd(pos, p->pos, pos);
}
VectorDivide(pos, state.particleCount, pos);
glTranslatef(-pos[0], -pos[1], -pos[2]);
VectorCopy(pos, view.lastCenter);
}
void setColoursByVel() {
int i;
particle_t *p;
particleDetail_t *pd;
float d;
float velMax = 0;
float velSpeed;
VectorNew(zero);
VectorZero(zero);
// works out the highest velocity
for (i = 0; i < state.particleCount; i++) {
p = getParticleCurrentFrame(i);
distance(zero, p->vel, velSpeed);
velSpeed = fabs(velSpeed);
if (i == 0) {
velMax = velSpeed;
} else {
if (velSpeed > velMax)
velMax = velSpeed;
}
}
// applies velocity based on the highest
for (i = 0; i < state.particleCount; i++) {
p = getParticleFirstFrame(i);
pd = getParticleDetail(i);
distance(zero, p->vel, velSpeed);
d = velSpeed / velMax;
colourFromNormal(pd->col, (float)fabs((double)d));
pd->particleSprite = colourSprite(pd->col, pd->mass);
}
}