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-rw-r--r--public/face.js44
1 files changed, 35 insertions, 9 deletions
diff --git a/public/face.js b/public/face.js
index d1e5431..cb10e0b 100644
--- a/public/face.js
+++ b/public/face.js
@@ -1,21 +1,35 @@
jQuery(function($) {
"use strict";
+ // default base price
var BASE_PRICE = 55.73;
- var CURRENT = 10;
+ var CURRENT = 0;
var DATA_URL = './current.json';
+ /**
+ * Convert asking price to percentage of base price.
+ *
+ * Used to convert the current asking price to a percentage in the
+ * ajax request at the bottom of this file.
+ */
function to_percent(ask) {
return Math.round((ask - BASE_PRICE) / BASE_PRICE * 10000) / 100.0;
}
/**
- * get the current time, in milliseconds since the epoch.
+ * Get the current time as milliseconds since the epoch.
+ *
+ * Used to find the current frame in tick() below.
*/
function now() {
return (new Date()).getTime();
}
+ /**
+ * Convert sprite sheet position to rectangle.
+ *
+ * Used to generate FRAMES below.
+ */
function to_rect(pos) {
return {
x: 14 + 26 * pos.x,
@@ -25,6 +39,11 @@ jQuery(function($) {
};
}
+ /**
+ * Convert frame parameters to hash of CSS directives.
+ *
+ * Used to generate FRAMES below.
+ */
function to_css(rect) {
return {
width: rect.w + 'px',
@@ -35,6 +54,11 @@ jQuery(function($) {
};
}
+ /**
+ * Frame list.
+ *
+ * Note: map of time and rate to CSS.
+ */
var FRAMES = [{
// hurt0-c
time: { min: 0, max: 250 },
@@ -153,22 +177,24 @@ jQuery(function($) {
};
});
+ /**
+ * get current frame based on time and rate.
+ */
function get_frame(time, rate) {
// time, modulo 1000
var tm = time % 1000;
- var frames = FRAMES.filter(function(row) {
+ return FRAMES.find(function(row) {
return (
(tm >= row.time.min) && (tm < row.time.max) &&
(rate >= row.rate.min) && (rate < row.rate.max)
);
- });
-
- return ((frames.length > 0) ? frames[0] : FRAMES[0]);
+ }) || FRAMES[0];
}
- // 14x13, 24x29
-
+ /**
+ * update animation.
+ */
function tick() {
var time = now(),
rate = +$('#rate').val(),
@@ -192,6 +218,7 @@ jQuery(function($) {
return false;
});
+ // fetch current price as percent and populate #rate
$.ajax({
method: 'GET',
url: DATA_URL,
@@ -203,4 +230,3 @@ jQuery(function($) {
$('#rate').val(CURRENT);
});
});
-