public void copyFrom(GMatrix p_from)
{
a = p_from.a;
b = p_from.b;
c = p_from.c;
d = p_from.d;
tx = p_from.tx;
ty = p_from.ty;
}
public void concat(GMatrix p_matrix)
{
double a1 = a * p_matrix.a + b * p_matrix.c;
b = a * p_matrix.b + b * p_matrix.d;
a = a1;
double c1 = c * p_matrix.a + d * p_matrix.c;
d = c * p_matrix.b + d * p_matrix.d;
c = c1;
double tx1 = tx * p_matrix.a + ty * p_matrix.c + p_matrix.tx;
ty = tx * p_matrix.b + ty * p_matrix.d + p_matrix.ty;
tx = tx1;
}
