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#include <scicos/scicos_block.h>
void
bounce4(blockp, flagr)
int flagr;
scicos_block *blockp;
{
int *flag,*nevprt,*nx,*ipar;
int *outsz;
double *x,*xd,*rpar;
double **outptr,*t;
double *g;
int *ng;
scicos_block block;
int *jroot;
int i1;
double d1, d2, d3;
static double a, b, c;
static int i, j, k, n;
static double v, s1, s2, s3, s4, xsi,*y1,*y2;
/* Scicos block simulator */
/* bouncing ball */
/* rpar(i): mass of ball i */
/* rpar(i+n): radius of ball i */
/* rpar(2n+1:2n+4); [xmin,xmax,ymin,ymax] */
/* x: [x1,x1',y1,y1',x2,x2',y2,y2',...,yn'] */
/* n:number of ball=ny1=ny2 */
/* y1: x-coord des balles */
/* y2: y-coord des balles */
/* ipar: storage de taille [nx(n-1)/2=ng]*2 */
block=*blockp;
flag=&flagr;
nevprt=&block.nevprt;
nx=&block.nx;
ipar=block.ipar;
outsz=block.outsz;
x=block.x;
xd=block.xd;
rpar=block.rpar;
outptr=block.outptr;
g=block.g;
ng=&block.ng;
jroot=block.jroot;
/* Parameter adjustments to index vectors as in Scilab (fortran)*/
--g;
--ipar;
--rpar;
--x;
--xd;
y1=(double *)outptr[0];
y2=(double *)outptr[1];
--y2;
--y1;
--jroot;
n = outsz[0];
if (*flag == 0) {
c = rpar[(n << 1) + 6];
i1 = n;
for (i = 1; i <= i1; ++i) {
xd[((i - 1) << 2) + 1] = x[((i - 1) << 2) + 2];
xd[((i - 1) << 2) + 3] = x[((i - 1) << 2) + 4];
xd[((i - 1) << 2) + 2] = -c * x[((i - 1) << 2) + 2];
xd[((i - 1) << 2) + 4] = -rpar[(n << 1) + 5] ;
}
} else if (*flag == 1) {
i1 = n;
for (i = 1; i <= i1; ++i) {
y1[i] = x[(i - 1 << 2) + 1];
y2[i] = x[(i - 1 << 2) + 3];
}
} else if (*flag == 9) {
i1 = *ng - (n << 2);
for (k = 1; k <= i1; ++k) {
i = ipar[(k - 1 << 1) + 1];
j = ipar[(k - 1 << 1) + 2];
d1 = x[(i - 1 << 2) + 1] - x[(j - 1 << 2) + 1];
d2 = x[(i - 1 << 2) + 3] - x[(j - 1 << 2) + 3];
d3 = rpar[i + n] + rpar[j + n];
g[k] = d1 * d1 + d2 * d2 - d3 * d3;
}
k = *ng - (n << 2) + 1;
i1 = n;
for (i = 1; i <= i1; ++i) {
g[k] = x[(i - 1 << 2) + 3] - rpar[i + n] - rpar[(n << 1) + 3];
++k;
g[k] = rpar[(n << 1) + 4] - x[(i - 1 << 2) + 3] - rpar[i + n];
++k;
g[k] = x[(i - 1 << 2) + 1] - rpar[(n << 1) + 1] - rpar[i + n];
++k;
g[k] = rpar[(n << 1) + 2] - rpar[i + n] - x[(i - 1 << 2) + 1];
++k;
}
} else if (*flag == 2 && *nevprt < 0) {
i1 = *ng - (n << 2);
for (k = 1; k <= i1; ++k) {
if (jroot[k] < 0) {
i = ipar[(k - 1 << 1) + 1];
j = ipar[(k - 1 << 1) + 2];
s1 = x[(j - 1 << 2) + 1] - x[(i - 1 << 2) + 1];
s2 = -rpar[i] * s1 / rpar[j];
s3 = x[(j - 1 << 2) + 3] - x[(i - 1 << 2) + 3];
s4 = -rpar[i] * s3 / rpar[j];
a = rpar[i] * (s1 * s1 + s3 * s3) + rpar[j] * (s2 * s2 + s4
* s4);
b = rpar[i] * (s1 * x[(i - 1 << 2) + 2] + s3 * x[(i - 1
<< 2) + 4]) + rpar[j] * (s2 * x[(j - 1 << 2) + 2] +
s4 * x[(j - 1 << 2) + 4]);
xsi = -(b * 2. / a);
x[(i - 1 << 2) + 2] += s1 * xsi;
x[(j - 1 << 2) + 2] += s2 * xsi;
x[(i - 1 << 2) + 4] += s3 * xsi;
x[(j - 1 << 2) + 4] += s4 * xsi;
}
}
k = *ng - (n << 2) + 1;
i1 = n;
for (i = 1; i <= i1; ++i) {
if (jroot[k] < 0) {
x[(i - 1 << 2) + 4] = -x[(i - 1 << 2) + 4];
}
++k;
if (jroot[k] < 0) {
x[(i - 1 << 2) + 4] = -x[(i - 1 << 2) + 4];
}
++k;
if (jroot[k] < 0) {
x[(i - 1 << 2) + 2] = -x[(i - 1 << 2) + 2];
}
++k;
if (jroot[k] < 0) {
x[(i - 1 << 2) + 2] = -x[(i - 1 << 2) + 2];
}
++k;
}
}
} /* bounce_ */
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