/**
* Copyright (c) 2009, Benjamin Joffe
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR AND CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
var map;
var canvas;
var overlay;
//variables initiated at the bottom of the code...
var pi=Math.PI;
var total=0;
Number.prototype.range=function(){
return (this+2*pi)%(2*pi);
}
Number.prototype.roundC=function(){
return Math.round(this*100)/100;
}
var total=0;
var samples=200;
var arena=[];
arena[0]=[1,1,1,1,1,1,1,1,1,1]
arena[1]=[1,0,0,0,0,0,0,0,0,1]
arena[2]=[1,0,0,1,0,1,1,1,0,1]
arena[3]=[1,0,1,0,0,0,0,1,0,1]
arena[4]=[1,0,0,0,0,1,0,1,0,1]
arena[5]=[1,0,1,1,0,0,0,0,0,1]
arena[6]=[1,0,0,1,0,1,1,1,0,1]
arena[7]=[1,1,0,1,0,0,0,1,0,1]
arena[8]=[1,0,0,1,0,1,0,0,0,1]
arena[9]=[1,1,1,1,1,1,1,1,1,1]
var playerPos=[4,4]; // x,y (from top left)
var playerDir=0.4; // theta, facing right=0=2pi
var playerPosZ=1;
var key=[0,0,0,0,0]; // left, right, up, down
var playerVelY=0;
var face=[];
function wallDistance(theta){
var data=[];
face=[];
var x = playerPos[0], y = playerPos[1];
var deltaX, deltaY;
var distX, distY;
var stepX, stepY;
var mapX, mapY
var atX=Math.floor(x), atY=Math.floor(y);
var thisRow=-1;
var thisSide=-1;
var lastHeight=0;
for (var i=0; i
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