function findKeyIndex(keys, row) {
var lo = 0, hi = keys.length;
while (lo < hi) {
var mi = ((hi + lo) / 2) | 0;
if (keys[mi] < row)
lo = mi + 1;
else if (keys[mi] > row)
hi = mi;
else
return mi;
}
return lo - 1;
}
function getValue(track, row) {
var keys = Object.keys(track);
if (!keys.length)
return 0.0;
var idx = findKeyIndex(keys, Math.floor(row));
if (idx < 0)
return track[keys[0]].value;
if (idx > keys.length - 2)
return track[keys[keys.length - 1]].value;
// lookup keys and values
var k0 = keys[idx], k1 = keys[idx + 1];
var a = track[k0].value;
var b = track[k1].value;
// interpolate
var t = (row - k0) / (k1 - k0);
switch (track[k0].interpolation) {
case 0:
return a;
case 1:
return a + (b - a) * t;
case 2:
return a + (b - a) * t * t * (3 - 2 * t);
case 3:
return a + (b - a) * Math.pow(t, 2.0);
}
}
track = {
"2" : { "value" : 1.0, "interpolation" : 1 },
"3" : { "value" : 2.0, "interpolation" : 1 },
"4" : { "value" : 3.0, "interpolation" : 1 },
"5" : { "value" : 4.0, "interpolation" : 1 },
"10" : { "value" : 5.0, "interpolation" : 1 }
};
// insert key
track[20] = { "value" : 6.0, "interpolation" : 1 };
// remove key
delete track[20];
// get interpolated values
var rows = [ -1.0, 2.0, 2.5, 3.0, 7.5, 10.0, 11.0 ];
for (var r in rows)
console.log(rows[r] + ' = ' + getValue(track, rows[r]));
Output
You can jump to the latest bin by adding /latest
to your URL
Keyboard Shortcuts
Shortcut | Action |
---|---|
ctrl + [num] | Toggle nth panel |
ctrl + 0 | Close focused panel |
ctrl + enter | Re-render output. If console visible: run JS in console |
Ctrl + l | Clear the console |
ctrl + / | Toggle comment on selected lines |
ctrl + ] | Indents selected lines |
ctrl + [ | Unindents selected lines |
tab | Code complete & Emmet expand |
ctrl + shift + L | Beautify code in active panel |
ctrl + s | Save & lock current Bin from further changes |
ctrl + shift + s | Open the share options |
ctrl + y | Archive Bin |
Complete list of JS Bin shortcuts |
JS Bin URLs
URL | Action |
---|---|
/ | Show the full rendered output. This content will update in real time as it's updated from the /edit url. |
/edit | Edit the current bin |
/watch | Follow a Code Casting session |
/embed | Create an embeddable version of the bin |
/latest | Load the very latest bin (/latest goes in place of the revision) |
/[username]/last | View the last edited bin for this user |
/[username]/last/edit | Edit the last edited bin for this user |
/[username]/last/watch | Follow the Code Casting session for the latest bin for this user |
/quiet | Remove analytics and edit button from rendered output |
.js | Load only the JavaScript for a bin |
.css | Load only the CSS for a bin |
Except for username prefixed urls, the url may start with http://jsbin.com/abc and the url fragments can be added to the url to view it differently. |