subtract(b)
    {
        this.a -= b.a;
        this.b -= b.b;
        this.c -= b.c;
        this.d -= b.d;
        this.tx -= b.tx;
        this.ty -= b.ty;

        return this;
    }
/**
     * Subtracts the passed matrix from this one.
     *
     * @param {Matrix2d} b - the operand to subtract from this matrix.
     * @return {Matrix2d} returns itself.
     */
Subtracts the passed matrix from this one.
@param {Matrix2d} b - the operand to subtract from this matrix.
@return {Matrix2d} returns itself.
Subtracts the passed matrix from this one . @param { Matrix2d } b - the operand to subtract from this matrix . @return { Matrix2d } returns itself .
subtract(b)
    {
        this.a -= b.a;
        this.b -= b.b;
        this.c -= b.c;
        this.d -= b.d;
        this.tx -= b.tx;
        this.ty -= b.ty;
        return this;
    }
subtract ( b ) { this . a -= b . a ; this . b -= b . b ; this . c -= b . c ; this . d -= b . d ; this . tx -= b . tx ; this . ty -= b . ty ; return this ; }
Subtracts the passed matrix from this one.
Subtracts the passed matrix from this one .