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Lua Game Development Cookbook

You're reading from   Lua Game Development Cookbook Over 70 recipes that will help you master the elements and best practices required to build a modern game engine using Lua

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Product type Paperback
Published in Jul 2015
Publisher
ISBN-13 9781849515504
Length 360 pages
Edition 1st Edition
Languages
Tools
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Author (1):
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Mário Kašuba Mário Kašuba
Author Profile Icon Mário Kašuba
Mário Kašuba
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Toc

Table of Contents (11) Chapters Close

Preface 1. Basics of the Game Engine 2. Events FREE CHAPTER 3. Graphics – Common Methods 4. Graphics – Legacy Method with OpenGL 1.x–2.1 5. Graphics – Modern Method with OpenGL 3.0+ 6. The User Interface 7. Physics and Game Mechanics 8. Artificial Intelligence 9. Sounds and Networking Index

Moving objects


Dynamic objects can be moved primarily by using forces. Moving objects by setting their position manually is not recommended because you can easily miss an object collision this way. However, you can set an object's position at the start of your game to adjust the initial object location.

Getting ready

For this recipe, you'll need a dynamic object with a nonzero mass and density:

local body_def = box2d.BodyDef()
body_def.type = 'dynamic'
body_def.position = Vec(0,0)
body_def.angle = 0

local body = world.createBody(body_def)
local shape = box2d.CircleShape()
shape.radius = 1

local fixture_def = box2d.FixtureDef()
fixture_def.shape = shape
fixture_def.density = 1.5
fixture_def.friction = 0.3
fixture_def.restitution = 0.2

local fixture = body.createFixture(fixture_def)

How to do it…

In the real world, you have to use a force to move objects. There are two ways in which you can apply a force to move objects in Box2D—the continual force and impulses.

The continual force

The continual...

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