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jQuery(function($) {
"use strict";
// default base price
var BASE_PRICE = 55.73;
// current price (fetched below from current.json)
var CURRENT = 0;
// path to JSON data
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;
}
/**
* 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
t: [0, 250],
p: [-5, 5],
pos: { x: 1, y: 0 },
}, {
// hurt0-r
t: [250, 500],
p: [-5, 5],
pos: { x: 2, y: 0 },
}, {
// hurt0-c
t: [500, 750],
p: [-5, 5],
pos: { x: 1, y: 0 },
}, {
// hurt0-l
t: [750, 1000],
p: [-5, 5],
pos: { x: 0, y: 0 },
}, {
// hurt1-c
t: [0, 250],
p: [-15, -5],
pos: { x: 1, y: 1 },
}, {
// hurt1-r
t: [250, 500],
p: [-15, -5],
pos: { x: 2, y: 1 },
}, {
// hurt1-c
t: [500, 750],
p: [-15, -5],
pos: { x: 1, y: 1 },
}, {
// hurt1-l
t: [750, 1000],
p: [-15, -5],
pos: { x: 0, y: 1 },
}, {
// hurt2-c
t: [0, 250],
p: [-30, -15],
pos: { x: 1, y: 2 },
}, {
// hurt2-r
t: [250, 500],
p: [-30, -15],
pos: { x: 2, y: 2 },
}, {
// hurt2-c
t: [500, 750],
p: [-30, -15],
pos: { x: 1, y: 2 },
}, {
// hurt2-l
t: [750, 1000],
p: [-30, -15],
pos: { x: 0, y: 2 },
}, {
// hurt3-c
t: [0, 250],
p: [-50, -30],
rect: { x: 14 + 26 * 1, y: 14 + 31 * 3, w: 24, h: 29 },
}, {
// hurt3-r
t: [250, 500],
p: [-50, -30],
rect: { x: 14 + 26 * 2, y: 14 + 31 * 3, w: 24, h: 29 },
}, {
// hurt3-c
t: [500, 750],
p: [-50, -30],
rect: { x: 14 + 26 * 1, y: 14 + 31 * 3, w: 24, h: 29 },
}, {
// hurt3-l
t: [750, 1000],
p: [-50, -30 ],
rect: { x: 14 + 26 * 0, y: 14 + 31 * 3, w: 24, h: 29 },
}, {
// hurt4-c
t: [0, 250],
p: [-75, -50],
rect: { x: 14 + 26 * 1, y: 16 + 31 * 4, w: 24, h: 29 },
}, {
// hurt4-r
t: [250, 500],
p: [-75, -50],
rect: { x: 14 + 26 * 2, y: 16 + 31 * 4, w: 24, h: 29 },
}, {
// hurt4-c
t: [500, 750],
p: [-75, -50],
rect: { x: 14 + 26 * 1, y: 16 + 31 * 4, w: 24, h: 29 },
}, {
// hurt4-l
t: [750, 1000],
p: [-75, -50],
rect: { x: 14 + 26 * 0, y: 16 + 31 * 4, w: 24, h: 29 },
}, {
// dead
t: [0, 1001],
p: [-10000, -75],
rect: { x: 14, y: 335, w: 24, h: 31 },
}, {
// invincible
t: [0, 1001],
p: [5, 10000],
rect: { x: 40, y: 335, w: 24, h: 29 },
}].map(function(row) {
return {
t: row.t,
p: row.p,
css: to_css(row.rect ? row.rect : to_rect(row.pos)),
};
});
function in_range(v, row) {
return (v >= row[0]) && (v < row[1]);
}
/**
* 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 in_range(tm, row.t) && in_range(rate, row.p);
}) || FRAMES[0];
}
/**
* update animation.
*/
function tick() {
$('#face').css(get_frame(
(new Date()).getTime(),
+$('#rate').val()
));
}
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;
});
// set base price
$('#base').text(BASE_PRICE);
$('#help-toggle').click(function() {
// toggle help visibility
$('#help').toggleClass('hidden');
// update text
var text = $('#help').hasClass('hidden') ? 'Show Help' : 'Hide Help';
$(this).text(text);
// stop event
return false;
});
// fetch current price as percent and populate #rate
fetch(DATA_URL).then(function(r) {
return r.json();
}).then(function(r) {
// cache current price
CURRENT = to_percent(r.ask);
// update field
$('#rate').val(CURRENT);
});
});
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