Mazes - The Essential Guide to HTML5 - page 249

Code Explanation

var wall;

for(i=0;i<walls.length;i++) {

wall = walls[i];

if (intersect(wall.sx,wall.sy,
wall.fx,wall.fy,this.sx,this.sy,

this.rad)) {

this.sx -=dx;

this.sy -=dy;

break;

}

}

}

function Wall(sx,sy,fx,fy,width,stylestring)
{

this.sx = sx;

this.sy = sy;

this.fx = fx;

this.fy = fy;

this.width = width;

this.draw = drawAline;

this.strokestyle = stylestring;

}

function drawAline() {