void
CalcPixels2(double Edges[3][2], int **Pixels, int *counter)
{
int i;
double minX=10000000,maxX=-10000000,minY=100000000,maxY=-100000000;
for (i=0;i<3;i++){
Edges[i][0] = round(Edges[i][0]);
Edges[i][1] = round(Edges[i][1]);
}
for (i=0;i<3;i++){
if (Edges[i][0]<minX){
minX = Edges[i][0];
}
if (Edges[i][0]>maxX){
maxX = Edges[i][0];
}
if (Edges[i][1]<minY){
minY = Edges[i][1];
}
if (Edges[i][1]>maxY){
maxY = Edges[i][1];
}
}
*counter = 0;
int A01 = Edges[0][1] - Edges[1][1], B01 = Edges[1][0] - Edges[0][0];
int A12 = Edges[1][1] - Edges[2][1], B12 = Edges[2][0] - Edges[1][0];
int A20 = Edges[2][1] - Edges[0][1], B20 = Edges[0][0] - Edges[2][0];
struct Point2D p = { minX, minY };
struct Point2D v0 = { Edges[0][0], Edges[0][1]};
struct Point2D v1 = { Edges[1][0], Edges[1][1]};
struct Point2D v2 = { Edges[2][0], Edges[2][1]};
int w0_row = orient2d(v1, v2, p);
int w1_row = orient2d(v2, v0, p);
int w2_row = orient2d(v0, v1, p);
for (p.y = minY; p.y <= maxY; p.y++) {
int w0 = w0_row;
int w1 = w1_row;
int w2 = w2_row;
for (p.x = minX; p.x <= maxX; p.x++) {
if (w0 >= 0 && w1 >= 0 && w2 >= 0){
Pixels[*counter][0] = p.x;
Pixels[*counter][1] = p.y;
*counter+=1;
}
else if(len2d(v1,v2,p)<0.99){
Pixels[*counter][0] = p.x;
Pixels[*counter][1] = p.y;
*counter+=1;
}
else if(len2d(v2,v0,p)<0.99){
Pixels[*counter][0] = p.x;
Pixels[*counter][1] = p.y;
*counter+=1;
}
else if(len2d(v0,v1,p)<0.99){
Pixels[*counter][0] = p.x;
Pixels[*counter][1] = p.y;
*counter+=1;
}
w0 += A12;
w1 += A20;
w2 += A01;
}
w0_row += B12;
w1_row += B20;
w2_row += B01;
}
}
//! Affects an array of particles.
void CParticlePushAffector::affect(u32 now, SParticle* particlearray, u32 count)
{
// if this is the first time the affector has been executed
if( LastTime == 0 )
{
// just record the time and return as we cannot calculate a delta
LastTime = now;
return;
}
// calculate the time delta based on the amount of time that has passed between frames
f32 timeDelta = ( now - LastTime ) / 1000.0f;
// record the time so we can calculate the next delta
LastTime = now;
// if this affector is disabled we have nothing to do
if (!Enabled)
return;
// itterate all of the particles
for(u32 i=0; i<count; ++i)
{
/* calculate the direction of effect ( even if this is a distant effect we
still need this to calculate the strength of the effect */
core::vector3df direction = particlearray[i].pos - CenterOfEffect;
f32 distance = direction.getLength() - NearestDistanceOfEffect;
// if we are within the field of effect
if (( distance >= 0.0f ) && ( distance < FurthestDistanceOfEffect ))
{
f32 strength;
core::vector3df AppliedStrengthOfEffect = StrengthOfEffect;
/* if this is a torus effect then its X, Z effect is modulated
between the distant and near */
// if there is no near distance
if ( NearestDistanceOfEffect == 0.0f )
{
/* calculate the strength based on the distance from the center of the
effect and the amount of time that has passed */
strength = timeDelta * (1.0f - ( distance / FurthestDistanceOfEffect ));
}
else
{
/* calculate the strength based on the halfway distance between
the near and far distance from the center of the effect and the
amount of time that has passed */
strength = timeDelta * (1.0f - ( fabs(distance * 2.0f - FurthestDistanceOfEffect ) / FurthestDistanceOfEffect ));
}
// if there is a column distance
if ( ColumnDistanceOfEffect != 0.0f )
{
core::vector2df len2d( fabs( direction.X ), fabs( direction.Z ));
strength *= ( ColumnDistanceOfEffect - len2d.getLength()) / ColumnDistanceOfEffect;
}
// if this is a distant effect
if ( !DistantEffect )
{
// all particles are affected in the same way
particlearray[i].pos += AppliedStrengthOfEffect * strength;
}
else
{
// particles are affected individually dependant on their relation to the center of effect
particlearray[i].pos += direction.normalize() * AppliedStrengthOfEffect * strength;
}
}
}
}
