MAZES
Code Explanation
ctx.beginPath(); Begin path
ctx.moveTo(this.sx+radMath.cos
(-.5this.angle),this.sy+radMath.sin
(-.5this.angle));
Move to first vertex of the token polygon
(which is a pentagon)for (i=1;i<this.n;i++) { For loop to draw the n sides of the
token: 5 sides in this case
ctx.lineTo(this.sx+radMath.cos
((i-.5)this.angle),this.sy+radMath.sin
((i-.5)this.angle));
Specify line to next vertex, setting up the
drawing of a side of the pentagon} Close for
ctx.fill(); Draw token
} Close function
function movetoken(dx,dy) { Function header
this.sx +=dx; Increment x value
this.sy +=dy; Increment y value
var i; Index
var wall; Used for each wall
for(i=0;i<walls.length;i++) { Loop over all walls
wall = walls[i]; Extract ith wall
if (intersect(wall.sx,
wall.sy,wall.fx,wall.fy,this.sx,this.sy,
this.rad)) {
Check for intersect. If there is an
intersection between the new position of
the token and this specific wallthis.sx -=dx; ... change x back—don't make this move
this.sy -=dy; ... change y back—don't make this move
break; Leave for loop because it isn't
necessary to do any more checking if
there is a collision with one wall.