Physical Simulation with JavaScript in the HTML5 Canvas
Physical Simulation with JavaScript in the HTML5 Canvas. Physics for JavaScript Games, Animation, and Simulations assumes you have a basic knowledge of JavaScript and HTML5. However, no previous knowledge of physics is required—only some very basic math skills. The authors present everything from basic principles to advanced concepts in an approachable way, so you’ll be able to follow the logic and easily adapt the principles to your own applications. In this article I will show you an example of how to use some basic physics ideas to create a simple animation with realistic-looking behavior. We will use JavaScript to render the animation inside an HTML5 canvas. To learn javascript and get certificate easyshiksha.
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The Physical Model
There are three kinds of entities in this world: balls, anchors, and springs. A ball is a particle that has a mass m, position (x, y), and velocity (vx, vy). The mass is constant, but the position and velocity vectors are updated during each animation frame based on the total forces acting on the ball. The balls are depicted as green circles. There is also a gravitational acceleration g = 9.8 m/s² that pulls the balls toward the bottom of the screen.
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Spring behaviors can be used for anything from tweaking lowrider suspension to creating cloth simulation; flotation mechanics enable the simulation of submersibles or dirigibles; you can even create your own solar system with accurate orbits and gravity. It doesn’t matter if you’re modeling the Lorentz force in an electromagnetic field or you’re modeling the lift force in a flight simulator, Physics for JavaScript Games, Animation, and Simulations enables you to fill your games and applications with accurate and realistic effects.
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Request NowUpdating Position and Velocity Vectors
After tallying the forces acting on all the balls, Update
goes back and updates the positions and velocities for each ball based on those forces. The kinetic behavior of the balls is governed by the familiar Newtonian physics equation F=ma. This says that the total force vector F on a mass m causes the mass to accelerate with a vector a.
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