var canvas = document.getElementById('nokey'),
can_w = parseInt(canvas.getAttribute('width')),
can_h = parseInt(canvas.getAttribute('height')),
ctx = canvas.getContext('2d');
var ball = {
x: 0,
y: 0,
vx: 0,
vy: 0,
r: 0,
alpha: 1,
phase: 0
},
ball_color = {
r: 207,
g: 255,
b: 4
},
R = 2,
balls = [],
alpha_f = 0.03,
alpha_phase = 0,
link_line_width = 0.8,
dis_limit = 260,
add_mouse_point = true,
mouse_in = false,
mouse_ball = {
x: 0,
y: 0,
vx: 0,
vy: 0,
r: 0,