void SR::vec::addAndMultiply(SR::vec rhs, double scalar)
{
m_vector(0) += rhs(0)*scalar;
m_vector(2) += rhs(1)*scalar;
m_vector(2) += rhs(2)*scalar;
m_vector(3) += rhs(3)*scalar;
}
void SR::vec::add(SR::vec rhs)
{
m_vector(0) += rhs(0);
m_vector(2) += rhs(1);
m_vector(2) += rhs(2);
m_vector(3) += rhs(3);
}
void vec(double xx, double yy){
int x0, y0, x1, y1, c0, c1, c, tx, ty;
double t;
t=SCX(e1->copyx); if(fabs(t)>BIGINT) return; x0=t;
t=SCY(e1->copyy); if(fabs(t)>BIGINT) return; y0=t;
t=SCX(xx); if(fabs(t)>BIGINT) return; x1=t;
t=SCY(yy); if(fabs(t)>BIGINT) return; y1=t;
e1->copyx=xx;
e1->copyy=yy;
/* clipping -- what a concept */
c0=code(x0, y0);
c1=code(x1, y1);
while(c0|c1){
if(c0&c1) return;
c=c0?c0:c1;
if(c&1) ty=y0+(y1-y0)*(clipminx-x0)/(x1-x0), tx=clipminx;
else if(c&2) ty=y0+(y1-y0)*(clipmaxx-x0)/(x1-x0), tx=clipmaxx;
else if(c&4) tx=x0+(x1-x0)*(clipminy-y0)/(y1-y0), ty=clipminy;
else tx=x0+(x1-x0)*(clipmaxy-y0)/(y1-y0), ty=clipmaxy;
if(c==c0) x0=tx, y0=ty, c0=code(x0, y0);
else x1=tx, y1=ty, c1=code(x1, y1);
}
m_vector(x0, y0, x1, y1, e1->foregr);
}
