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jQuery(function($) {
"use strict";
// default base price
var BASE_PRICE = 55.73;
var CURRENT = 0;
var DATA_URL = './current.json';
/**
* Convert asking price to percentage of base price.
*
* Used to convert the current asking price to a percentage in the
* ajax request at the bottom of this file.
*/
function to_percent(ask) {
return Math.round((ask - BASE_PRICE) / BASE_PRICE * 10000) / 100.0;
}
/**
* Get the current time as milliseconds since the epoch.
*
* Used to find the current frame in tick() below.
*/
function now() {
return (new Date()).getTime();
}
/**
* Convert sprite sheet position to rectangle.
*
* Used to generate FRAMES below.
*/
function to_rect(pos) {
return {
x: 14 + 26 * pos.x,
y: 13 + 31 * pos.y,
w: 24,
h: 29,
};
}
/**
* Convert frame parameters to hash of CSS directives.
*
* Used to generate FRAMES below.
*/
function to_css(rect) {
return {
width: rect.w + 'px',
height: rect.h + 'px',
'background-position': [rect.x, rect.y].map(function(v) {
return (-v) + 'px';
}).join(' '),
};
}
/**
* Frame list.
*
* Note: map of time and rate to CSS.
*/
var FRAMES = [{
// hurt0-c
time: { min: 0, max: 250 },
rate: { min: -5, max: 5 },
pos: { x: 1, y: 0 },
}, {
// hurt0-r
time: { min: 250, max: 500 },
rate: { min: -5, max: 5 },
pos: { x: 2, y: 0 },
}, {
// hurt0-c
time: { min: 500, max: 750 },
rate: { min: -5, max: 5 },
pos: { x: 1, y: 0 },
}, {
// hurt0-l
time: { min: 750, max: 1000 },
rate: { min: -5, max: 5 },
pos: { x: 0, y: 0 },
}, {
// hurt1-c
time: { min: 0, max: 250 },
rate: { min: -15, max: -5 },
pos: { x: 1, y: 1 },
}, {
// hurt1-r
time: { min: 250, max: 500 },
rate: { min: -15, max: -5 },
pos: { x: 2, y: 1 },
}, {
// hurt1-c
time: { min: 500, max: 750 },
rate: { min: -15, max: -5 },
pos: { x: 1, y: 1 },
}, {
// hurt1-l
time: { min: 750, max: 1000 },
rate: { min: -15, max: -5 },
pos: { x: 0, y: 1 },
}, {
// hurt2-c
time: { min: 0, max: 250 },
rate: { min: -30, max: -15 },
pos: { x: 1, y: 2 },
}, {
// hurt2-r
time: { min: 250, max: 500 },
rate: { min: -30, max: -15 },
pos: { x: 2, y: 2 },
}, {
// hurt2-c
time: { min: 500, max: 750 },
rate: { min: -30, max: -15 },
pos: { x: 1, y: 2 },
}, {
// hurt2-l
time: { min: 750, max: 1000 },
rate: { min: -30, max: -15 },
pos: { x: 0, y: 2 },
}, {
// hurt3-c
time: { min: 0, max: 250 },
rate: { min: -50, max: -30 },
rect: { x: 14 + 26 * 1, y: 14 + 31 * 3, w: 24, h: 29 },
}, {
// hurt3-r
time: { min: 250, max: 500 },
rate: { min: -50, max: -30 },
rect: { x: 14 + 26 * 2, y: 14 + 31 * 3, w: 24, h: 29 },
}, {
// hurt3-c
time: { min: 500, max: 750 },
rate: { min: -50, max: -30 },
rect: { x: 14 + 26 * 1, y: 14 + 31 * 3, w: 24, h: 29 },
}, {
// hurt3-l
time: { min: 750, max: 1000 },
rate: { min: -50, max: -30 },
rect: { x: 14 + 26 * 0, y: 14 + 31 * 3, w: 24, h: 29 },
}, {
// hurt4-c
time: { min: 0, max: 250 },
rate: { min: -75, max: -50 },
rect: { x: 14 + 26 * 1, y: 16 + 31 * 4, w: 24, h: 29 },
}, {
// hurt4-r
time: { min: 250, max: 500 },
rate: { min: -75, max: -50 },
rect: { x: 14 + 26 * 2, y: 16 + 31 * 4, w: 24, h: 29 },
}, {
// hurt4-c
time: { min: 500, max: 750 },
rate: { min: -75, max: -50 },
rect: { x: 14 + 26 * 1, y: 16 + 31 * 4, w: 24, h: 29 },
}, {
// hurt4-l
time: { min: 750, max: 1000 },
rate: { min: -75, max: -50 },
rect: { x: 14 + 26 * 0, y: 16 + 31 * 4, w: 24, h: 29 },
}, {
// dead
time: { min: 0, max: 1001 },
rate: { min: -10000, max: -75 },
rect: { x: 14, y: 335, w: 24, h: 31 },
}, {
// invincible
time: { min: 0, max: 1001 },
rate: { min: 5, max: 10000 },
rect: { x: 40, y: 335, w: 24, h: 29 },
}].map(function(row) {
return {
time: row.time,
rate: row.rate,
css: to_css(row.rect ? row.rect : to_rect(row.pos)),
};
});
/**
* get current frame based on time and rate.
*/
function get_frame(time, rate) {
// time, modulo 1000
var tm = time % 1000;
return FRAMES.find(function(row) {
return (
(tm >= row.time.min) && (tm < row.time.max) &&
(rate >= row.rate.min) && (rate < row.rate.max)
);
}) || FRAMES[0];
}
/**
* update animation.
*/
function tick() {
var time = now(),
rate = +$('#rate').val(),
frame = get_frame(time, rate);
// console.log({time: time % 1000, rect: rect});
// update #face
$('#face').css(frame.css);
}
setInterval(tick, 250);
$('#rate').keyup(tick).focus();
$('.set-rate').click(function() {
var val = $(this).data('val');
// set value
$('#rate').val((val == 'current') ? CURRENT : val);
// stop event
return false;
});
// fetch current price as percent and populate #rate
$.ajax({
method: 'GET',
url: DATA_URL,
dataType: 'json',
}).fail(function(r) {
alert("Couldn't fetch current data.");
}).done(function(r) {
CURRENT = to_percent(r.ask);
$('#rate').val(CURRENT);
});
});
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