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function drawship(ctx, x, y, rot) {
  ctx.lineWidth = 3;
  ctx.save();
  ctx.translate(x,y);
  ctx.rotate(rot);
  ctx.stroke(_shippath);
  if (ctx != _ctx) ctx.restore();
}
function makeshippath() {
  var path = new Path2D();
  path.moveTo(20,0);
  path.lineTo(-20,10);
  path.lineTo(-16,7);
  path.lineTo(-16,-7);
  path.lineTo(-20,-10);
  path.closePath();
  return path;
}
var _ship = {
  x : 0,
  y : 0,
  dx : 0,
  dy : 0,
  angle : 0,
  da : 0,
  invulnerable : 180,
  reset : function() {
    this.x = _width/2;
    this.y = _height/2;
    this.dx = this.dy = this.da = 0;
    this.angle = 0;
    this.da = 0;
    this.invulnerable = 180;
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