libs/agg/agg_trans_perspective.h

30         double sx, shy, w0, shx, sy, w1, tx, ty, w2;
35             sx (1), shy(0), w0(0),
43            sx (v0), shy(v1), w0(v2),
49            sx (m[0]), shy(m[1]), w0(m[2]),
55            sx (a.sx ), shy(a.shy), w0(0),
249                 nom_y(px * m.shy + py * m.sy + m.ty),
250                 nom_y_step(step * m.shy),
296             shy = q[3] - q[1];
316                 sx = shy = w0 = shx = sy = w1 = tx = ty = w2 = 0.0;
324             shy = q[3] - q[1] + u * q[3];
340         double d1 = w0  * ty - shy * w2;
341         double d2 = shy * w1 - w0  * sy;
345             sx = shy = w0 = shx = sy = w1 = tx = ty = w2 = 0.0;
351         shy = d * d1;
357         ty  = d * (a.shy*a.tx  - a.sx *a.ty);
358         w2  = d * (a.sx *a.sy  - a.shy*a.shx);
433         sx  = 1; shy = 0; w0 = 0;
444         sx  = a.sx *b.sx  + a.shx*b.shy + a.tx*b.w0;
447         shy = a.shy*b.sx  + a.sy *b.shy + a.ty*b.w0;
448         sy  = a.shy*b.shx + a.sy *b.sy  + a.ty*b.w1;
449         ty  = a.shy*b.tx  + a.sy *b.ty  + a.ty*b.w2;
450         w0  = a.w0 *b.sx  + a.w1 *b.shy + a.w2*b.w0;
461         sx  = a.sx *b.sx  + a.shx*b.shy + a.tx*b.w0;
464         shy = a.shy*b.sx  + a.sy *b.shy + a.ty*b.w0;
465         sy  = a.shy*b.shx + a.sy *b.sy  + a.ty*b.w1;
466         ty  = a.shy*b.tx  + a.sy *b.ty  + a.ty*b.w2;
475         sx  = a.sx *b.sx  + a.shx*b.shy + a.tx*b.w0;
478         shy = a.shy*b.sx  + a.sy *b.shy + a.ty*b.w0;
479         sy  = a.shy*b.shx + a.sy *b.sy  + a.ty*b.w1;
480         ty  = a.shy*b.tx  + a.sy *b.ty  + a.ty*b.w2;
481         w0  = a.w0 *b.sx  + a.w1 *b.shy + a.w2*b.w0;
492         sx  = a.sx *b.sx  + a.shx*b.shy;
495         shy = a.shy*b.sx  + a.sy *b.shy;
496         sy  = a.shy*b.shx + a.sy *b.sy;
497         ty  = a.shy*b.tx  + a.sy *b.ty  + a.ty;
498         w0  = a.w0 *b.sx  + a.w1 *b.shy;
577         *py = m * (x*shy + y*sy  + ty);
585         *y = tmp * shy + *y * sy  + ty;
593         *y = tmp * shy + *y * sy;
606         *m++ = sx;  *m++ = shy; *m++ = w0;
614         sx  = *m++; shy = *m++; w0 = *m++;
624         sx  = a.sx;  shy = a.shy; w0 = 0;
634                shx * (ty  * w0 - shy * w2) +
635                tx  * (shy * w1 - sy  * w0);
654                is_equal_eps(shy, 0.0, epsilon) &&
669                is_equal_eps(shy, m.shy, epsilon) &&
683         double y = 0.707106781 * shy + 0.707106781 * sy;
725         *y = std::sqrt(shy * shy + sy  * sy);