roBrowser - Keyboard support to move

keytomove.js

// Dependencies
var glMatrix  = require('Vendors/gl-matrix');
var Camera    = require('Renderer/Camera');
var vec2      = glMatrix.vec2;
var mat2      = glMatrix.mat2;

// Object to initialize
var direction = vec2.create();
var rotate    = mat2.create();

//---- Now the job ----
function processKeyEvent( event ) {

	// Get direction from keyboard
	direction[0] = (event.which === KEYS.RIGHT ? -1 :
	                event.which === KEYS.LEFT  ? +1 :
	                0);

	direction[1] = (event.which === KEYS.UP    ? +1 :
	                event.which === KEYS.DOWN  ? -1 :
	                0);

	// Initialize matrix, based on Camera direction
	mat2.identity(rotate);
	mat2.rotate(rotate, rotate, -Camera.direction * 45 / 180 * Math.PI);

	// Apply matrix to vector
	vec2.transformMat2( direction, direction, rotate);

	// You now have "direction" containing the direction based on the camera.
	// (value from -1 to 1).
	direction;
}

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