diff options
Diffstat (limited to 'msd2D/main.cpp')
| -rwxr-xr-x | msd2D/main.cpp | 80 |
1 files changed, 38 insertions, 42 deletions
diff --git a/msd2D/main.cpp b/msd2D/main.cpp index d911a14..4313bba 100755 --- a/msd2D/main.cpp +++ b/msd2D/main.cpp @@ -87,6 +87,9 @@ typedef struct _link { t_float distance_old; } t_link; + +inline t_float sqr(t_float x) { return x*x; } + class msd2D: public flext_base { @@ -136,57 +139,50 @@ protected: void m_bang() { - t_float F=0,Fx=0,Fy=0,distance,vitesse, X_new, Y_new; - t_int i; - t_mass **mi; - t_link **li; - - for (i=0, li=link; i<nb_link; li++, i++) { + t_int i; + for (i=0; i<nb_link; i++) { + t_link *li = link[i]; + t_mass *m1 = li->mass1,*m2 = li->mass2; // compute link forces - distance = sqrt(pow((*li)->mass1->posX-(*li)->mass2->posX,2) + - pow((*li)->mass1->posY-(*li)->mass2->posY,2)); // L[n] = sqrt( (x1-x2)² +(y1-y2)²) - if (distance < (*li)->long_min || distance > (*li)->long_max) { - Fx = 0; - Fy = 0; - } + t_float distance = sqrt(sqr(m1->posX-m2->posX) + sqr(m1->posY-m2->posY)); // L[n] = sqrt( (x1-x2)² +(y1-y2)²) + + t_float Fx,Fy; + if (distance < li->long_min || distance > li->long_max || distance == 0) + Fx = Fy = 0; else { - F = (*li)->K1 * (distance - (*li)->longueur) ; // F[n] = k1 (L[n] - L[0]) - F += (*li)->D1 * (distance - (*li)->distance_old) ; // F[n] = F[n] + D1 (L[n] - L[n-1]) - if (distance != 0) { - Fx = F * ((*li)->mass1->posX - (*li)->mass2->posX)/distance; // Fx = F * Lx[n]/L[n] - Fy = F * ((*li)->mass1->posY - (*li)->mass2->posY)/distance; // Fy = F * Ly[n]/L[n] - } + t_float F = (li->K1 * (distance - li->longueur) + li->D1 * (distance - li->distance_old))/distance; // F[n] = k1 (L[n] - L[0])/L[n]+ D1 (L[n] - L[n-1])/L[n] + Fx = F * (m1->posX - m2->posX); // Fx = F * Lx[n]/L[n] + Fy = F * (m1->posY - m2->posY); // Fy = F * Ly[n]/L[n] } - (*li)->mass1->forceX -= Fx; // Fx1[n] = -Fx - (*li)->mass1->forceX -= (*li)->D2*(*li)->mass1->speedX; // Fx1[n] = Fx1[n] - D2 * vx1[n-1] - (*li)->mass2->forceX += Fx; // Fx2[n] = Fx - (*li)->mass2->forceX -= (*li)->D2*(*li)->mass2->speedX; // Fx2[n] = Fx2[n] - D2 * vx2[n-1] - (*li)->mass1->forceY -= Fy; // Fy1[n] = -Fy - (*li)->mass1->forceY -= (*li)->D2*(*li)->mass1->speedY; // Fy1[n] = Fy1[n] - D2 * vy1[n-1] - (*li)->mass2->forceY += Fy; // Fy2[n] = Fy - (*li)->mass2->forceY -= (*li)->D2*(*li)->mass2->speedY; // Fy1[n] = Fy1[n] - D2 * vy1[n-1] - (*li)->distance_old = distance; // L[n-1] = L[n] + + m1->forceX -= Fx+li->D2*m1->speedX; // Fx1[n] = -Fx,Fx1[n] = Fx1[n] - D2 * vx1[n-1] + m1->forceY -= Fy+li->D2*m1->speedY; // Fy1[n] = -Fy,Fy1[n] = Fy1[n] - D2 * vy1[n-1] + m2->forceX += Fx-li->D2*m2->speedX; // Fx2[n] = Fx,Fx2[n] = Fx2[n] - D2 * vx2[n-1] + m2->forceY += Fy-li->D2*m2->speedY; // Fy2[n] = Fy,Fy1[n] = Fy1[n] - D2 * vy1[n-1] + li->distance_old = distance; // L[n-1] = L[n] } - for (i=0, mi=mass; i<nb_mass; mi++, i++) + for (i=0; i<nb_mass; i++) { + t_mass *mi = mass[i]; // compute new masses position only if mobile = 1 - if ((*mi)->mobile == 1) { - X_new = (*mi)->forceX * (*mi)->invM + 2*(*mi)->posX - (*mi)->posX2; // x[n] =Fx[n]/M+2x[n]-x[n-1] - (*mi)->posX2 = (*mi)->posX; // x[n-2] = x[n-1] - (*mi)->posX = max(min(X_new,Xmax),Xmin); // x[n-1] = x[n] - (*mi)->speedX = (*mi)->posX - (*mi)->posX2; // vx[n] = x[n] - x[n-1] - Y_new = (*mi)->forceY * (*mi)->invM + 2*(*mi)->posY - (*mi)->posY2; // x[n] =Fx[n]/M+2x[n]-x[n-1] - (*mi)->posY2 = (*mi)->posY; // x[n-2] = x[n-1] - (*mi)->posY = max(min(Y_new,Ymax),Ymin); // x[n-1] = x[n] - (*mi)->speedY = (*mi)->posY - (*mi)->posY2; // vx[n] = x[n] - x[n-1] + if (mi->mobile == 1) { + t_float X_new = mi->forceX * mi->invM + 2*mi->posX - mi->posX2; // x[n] =Fx[n]/M+2x[n]-x[n-1] + mi->posX2 = mi->posX; // x[n-2] = x[n-1] + mi->posX = max(min(X_new,Xmax),Xmin); // x[n-1] = x[n] + mi->speedX = mi->posX - mi->posX2; // vx[n] = x[n] - x[n-1] + t_float Y_new = mi->forceY * mi->invM + 2*mi->posY - mi->posY2; // x[n] =Fx[n]/M+2x[n]-x[n-1] + mi->posY2 = mi->posY; // x[n-2] = x[n-1] + mi->posY = max(min(Y_new,Ymax),Ymin); // x[n-1] = x[n] + mi->speedY = mi->posY - mi->posY2; // vx[n] = x[n] - x[n-1] } + } - for (i=0, mi=mass; i<nb_mass; mi++, i++) { + for (i=0; i<nb_mass; i++) { + t_mass *mi = mass[i]; // clear forces - (*mi)->out_forceX = (*mi)->forceX; - (*mi)->forceX = 0; // Fx[n] = 0 - (*mi)->out_forceY = (*mi)->forceY; - (*mi)->forceY = 0; // Fy[n] = 0 + mi->out_forceX = mi->forceX; + mi->out_forceY = mi->forceY; + mi->forceX = mi->forceY = 0; // Fx[n] = 0,Fy[n] = 0 } } |