topdown

libgdx animation inside of a rectangle - collison detection - rectangles

由 馋奶兔 提交于 2020-01-22 03:31:07
问题 I am writing a RPG game similar to the style of Pokemon (top down view). I am now working on the issue of collision detection. I am wanting to create the collision detection based on rectangles. The problem is that i am having difficulty drawing the rectangle around the animation that i have previously set. I have searched Google and YouTube for a answer/tutorial of how to handle this problem yet found nothing. Player.class public class Player { public Vector2 position; private float

Grammar: difference between a top down and bottom up? (Example)

由 Deadly 提交于 2020-01-13 09:14:28
问题 This is a follow up question from Grammar: difference between a top down and bottom up? I understand from that question that: the grammar itself isn't top-down or bottom-up, the parser is there are grammars that can be parsed by one but not the other (thanks Jerry Coffin So for this grammar (all possible mathematical formulas): E -> E T E E -> (E) E -> D T -> + | - | * | / D -> 0 D -> L G G -> G G G -> 0 | L L -> 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 Would this be readable by a top down and

Designing APIs in Java with top-down approach - Is writing up the Javadoc the best starting point?

由 跟風遠走 提交于 2020-01-12 01:50:56
问题 Whenever I have the need to design an API in Java, I normally start off by opening up my IDE, and creating the packages, classes and interfaces. The method implementations are all dummy, but the javadocs are detailed. Is this the best way to go about things? I am beginning to feel that the API documentation should be the first to be churned out - even before the first .java file is written up. This has few advantages: The API designer can complete the design & specification and then split up

How to implement a left recursion eliminator?

由 倖福魔咒の 提交于 2019-12-11 14:49:59
问题 How can i implement an eliminator for this? A := AB | AC | D | E ; 回答1: This is an example of so called immediate left recursion , and is removed like this: A := DA' | EA' ; A' := ε | BA' | CA' ; The basic idea is to first note that when parsing an A you will necessarily start with a D or an E . After the D or an E you will either end (tail is ε) or continue (if we're in a AB or AC construction). The actual algorithm works like this: For any left-recursive production like this: A -> A a1 | ..

Grammar: difference between a top down and bottom up?

由 此生再无相见时 提交于 2019-12-06 02:19:17
问题 What is the difference between a top down and bottom up grammar? An example would be awesome. 回答1: First of all, the grammar itself isn't top-down or bottom-up, the parser is (though there are grammars that can be parsed by one but not the other). From a practical viewpoint, the main difference is that most hand-written parsers are top-down, while a much larger percentage of machine-generated parsers are bottom-up (though, of course, the reverse is certainly possible). A top-down parser

Grammar: difference between a top down and bottom up? (Example)

由 青春壹個敷衍的年華 提交于 2019-12-05 05:33:25
This is a follow up question from Grammar: difference between a top down and bottom up? I understand from that question that: the grammar itself isn't top-down or bottom-up, the parser is there are grammars that can be parsed by one but not the other (thanks Jerry Coffin So for this grammar (all possible mathematical formulas): E -> E T E E -> (E) E -> D T -> + | - | * | / D -> 0 D -> L G G -> G G G -> 0 | L L -> 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 Would this be readable by a top down and bottom up parser? Could you say that this is a top down grammar or a bottom up grammar (or neither)? I am

How to get camera following a top down car in pygame

由 懵懂的女人 提交于 2019-12-01 06:59:45
问题 new to pygame and game programming in general, just wondered how I could get a camera to follow a car (nothing fancy) in a top down car game - think Micro Machines! I'm using Python 3.6, and have got a bike rotating, and moving around. I've kept the code here shorter but I do have a static image for reference if the camera worked! Here's what I have: import pygame, math, sys, random from pygame.locals import * display_width = 1280 display_height = 800 # Sets size of screen screen = pygame

Difference between Left Factoring and Left Recursion

由 空扰寡人 提交于 2019-11-29 21:23:58
What is the difference between Left Factoring and Left Recursion ? I understand that Left factoring is a predictive top down parsing technique. But I get confused when I hear these two terms. Left factoring is removing the common left factor that appears in two productions of the same non-terminal. It is done to avoid back-tracing by the parser. Suppose the parser has a look-ahead ,consider this example- A -> qB | qC where A,B,C are non-terminals and q is a sentence. In this case, the parser will be confused as to which of the two productions to choose and it might have to back-trace. After

Difference between Left Factoring and Left Recursion

由 巧了我就是萌 提交于 2019-11-28 18:57:55
问题 What is the difference between Left Factoring and Left Recursion ? I understand that Left factoring is a predictive top down parsing technique. But I get confused when I hear these two terms. 回答1: Left factoring is removing the common left factor that appears in two productions of the same non-terminal. It is done to avoid back-tracing by the parser. Suppose the parser has a look-ahead ,consider this example- A -> qB | qC where A,B,C are non-terminals and q is a sentence. In this case, the
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