However, our operators, which are modified versions of PLTL operators, provide a higher expressive power than PLTL. It is known that Propositional Linear Temporal Logic (PLTL) is strictly less expressive than regular expressions. Regular expressions can also be used to specify path formulas. If α and β are regular expressions, then so is α ⊗ β =. If α and β are regular expressions, then so is α or ⊙ β = αβ, where αβ denotes the concatenation of the expressions α and β, 3) Φ (empty sequence) and each member of Σ is a regular expression, 2) Regular ExpressionsĪ regular expression over the alphabet Σ (a set of symbols) is a sequence of symbols formed by repeated applications of the following rules : 1) In, ,, we have described techniques that transform such queries into object-algebra, expressions. On the other hand, GCalculus/ S (and GVISUAL) queries can contain arbitrarily nested sets (in GVISUAL, nested internal windows). However, since A and V and negation (except to the left of base predicates) are eliminated from GCalculus/ S and, equivalently, from GVISUAL, query complexity is constrained. Since GCalculus/ S variables can range over complex objects, it is clear that GCalculus/ S employs a second-order logic. Theorem 6.1 holds because there is a one-to-one correspondence between the logical symbols of GCalculus/ S and the (user-defined and user-changeable, icon-based) constructs of GVISUAL. That is, any GVISUAL query can be converted into a GCalculus/ S query and vice versa. GVISUAL and GCalculus/S are equivalent in expressive power. Ignoring (1) and (2) (as well as application-specific methods and functions of a given environment, arithmetic operators and aggregate functions) in GVISUAL, we have the following property. For example, the user states that, in the queries to be specified, among all possible spatial relationships, only to_the_left_of relationship will be specified among object icons in a spatial enforcement region of queries.īoth (1) and (2) significantly simplify the visual complexity of queries. VISUAL allows the specification of spatial relationships to be observed in a query before the query session starts. GVISUAL extends this technique into visually incomplete path specifications. For example, for the sake of visual simplicity, the user can skip the specification of object classes within multiply nested containment relationships, and the query processor derives this information from the database schema. VISUAL relies on the database schema to convert a given query into an unambiguous one. Visually incomplete specifications of containment relationships, class-subclass relationships, and paths are allowed. VISUAL (and, thus, GVISUAL) uses a number of techniques designed to simplify the visual specifications of queries: 1) The more detailed requirements from the hardware and software team may be related to the original requirements specified by the system team through derive relationships. For example, the hardware or software requirements that are originally specified by the systems engineering team may be analyzed by the hardware or software team to derive more detailed requirements that reflect additional implementation considerations or constraints. It is also used to represent a relationship between requirements at the peer level of the hierarchy but at different levels of abstraction. A derive relationship often shows relationships between requirements at different levels of the specification hierarchy. This relationship is often semantically equivalent to a set of SysML derive relationships. The requirements traceability matrix that is included in traditional specification documents often shows relationships between requirements in one specification to requirements in other higher- or lower-level specifications. Example of «deriveReqt» relationship, with rationale attached. Io = new ImageIcon(this.getClass().getResource("doodle.jpeg")) Public void setHitbox(Rectangle2D hitbox) Private Rectangle2D hitbox = new Rectangle((int)x,(int)y,PIC_HEIGHT,PIC_WIDTH) Private boolean leftPressed, rightPressed, spacePressed, UPressed, IPressed If (keycode = void keyReleased(KeyEvent e) Private static final int FRAME_HEIGHT = 500 Private static final int FRAME_WIDTH = 600 Public class DoodleJumpFrame extends JFrame implements KeyListener I tried doing the translate method but that does not work. It is registering that I pressed space, but I am not sure how to make the Doodle actually jump. I have put the keys (space, A, D) into the KeyListener and I am not sure why it's not working. I have to make the doodle jump but I am so lost. I am creating a doodle jump game and I am very confused.
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