Building a 2D Game Physics Engine: Using HTML5 and by Michael Tanaya, Huaming Chen, Jebediah Pavleas, Kelvin Sung

By Michael Tanaya, Huaming Chen, Jebediah Pavleas, Kelvin Sung

Build your own 2nd physics-based video game engine simulation procedure for inflexible physique dynamics. starting from scratch, during this booklet you'll conceal the implementation applied sciences, HTML5 and JavaScript; gather an easy and but whole primary arithmetic help library; outline easy inflexible physique behaviors; notice and unravel inflexible physique collisions; and simulate collision responses after the collisions.
In this manner, by way of the tip of Building a second video game Physics Engine, you've gotten an in‐depth figuring out of the explicit options and occasions, implementation info, and genuine resource code of a physics online game engine that's appropriate for construction second video games or templates for any 2nd video games you could create and will be performed around the web through well known web‐browsers.

What you are going to Learn

  • Gain an figuring out of second video game engine physics and the way to make use of it on your personal games
  • Describe the elemental behaviors of inflexible bodies

  • Detect collisions among inflexible bodies
  • Resolve interpretations after inflexible physique collisions
  • Model and enforce inflexible physique impulse responses

Who This publication Is For
Game lovers, hobbyists, and somebody who's attracted to construction their very own second physics online game engines yet is not sure of the way to begin.

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Extra resources for Building a 2D Game Physics Engine: Using HTML5 and JavaScript

Sample text

Add rotate function to implement the rotation of a circle. Note that since a circle is infinitely symmetrical, a rotated circle would appear identical to the original shape. The mStartpoint position allows a rotated reference line to be drawn to indicate angle of rotation of a circle. mCenter, angle); return this; }; The Rectangle Class Similar to the circle class, the Rectangle class must be modified to support the new functionality. 32 Chapter 2 ■ Implementing the 2D Physics Engine Core 1. js file.

BoundTest(gEngine. Core. Core. mContext); } } } }; 4. Add public variable within mPublic to allow access to the collision function. js file in the SiteRoot/EngineCore (or public_html/EngineCore) folder. 1. Invoke the collision computation from the runGameLoop function within the core engine loop. identical to previous project 42 Chapter 3 ■ Incorporating Collision Detection 2. Modify the updateUIEcho function to remove support for the H button. The gravity on/off functionality is no longer required.

This chapter focuses on the foundations of detecting collisions, including how to approximate the detection, a theory for exact detection of colliding rectangles and circles in any orientations, and essential information to capture after detecting a collision to support resolution of interpenetration and proper responses to collisions. You will implement this system in a step-by-step manner, from a simple broad phase collision detection method, to the more accurate and computationally more costly Separating Axis Theorem (SAT).

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