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<!DOCTYPE html>
<!--
To change this license header, choose License Headers in Project Properties.
To change this template file, choose Tools | Templates
and open the template in the editor.
-->
<html>
<head>
<title>TODO supply a title</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src="../app/lib/angular.js"></script>
</head>
<body>
<div>TODO write content</div>
<script type="text/javascript">
var dist = function(point1, point2) {
var dx = point1.x - point2.x;
var dy = point1.y - point2.y;
return Math.sqrt(dx * dx + dy * dy);
};
var computePlaylist = function(songList, line, duration) {
//compute distances from the constrain path
var threshold = 60;
angular.forEach(songList, function(song) {
song.selected = false;
});
var selection = [];
angular.forEach(line, function(point) {
angular.forEach(songList, function(song) {
var d = dist(song, point);
if (d < threshold && song.selected !== true) {
selection.push(song);
song.selected = true;
}
});
});
console.log(selection.length);
return selection;
};
var computePlaylist2 = function(songList, line, duration) {
//compute distances from the constrain path
var threshold = 60;
for(var i=songList.length-1; i>0; i--){
songList.selected = false;
};
var songCopy = songList.slice(0);
songCopy.sort(function(a,b){return a.x-b.x;});
var selection = [];
for(var i=line.length-1; i>0; i--) {
var point = line[i];
var min = line[i].x-threshold;
var max = line[i].x+threshold;
var j=songCopy.length-1;
while(songCopy[j].x > max && j > 0){
j--;
}
while(songCopy[j].x > min && j > 0){
var song = songCopy[j];
var d = dist(song, point);
if (d < threshold) {
songCopy.splice(j,1);
selection.push(song);
song.selected = true;
}
j--;
};
};
console.log(selection.length);
return selection;
};
var computePlaylist3 = function(songList, line, duration) {
//compute distances from the constrain path
var threshold = 60;
for(var i=songList.length-1; i>0; i--){
songList.selected = false;
};
var songCopy = songList.slice(0);
var selection = [];
for(var i=line.length-1; i>0; i--) {
var point = line[i];
for(var j=songCopy.length-1; j>0; j--){
var song = songCopy[j];
var d = dist(song, point);
if (d < threshold) {
songCopy.splice(j,1);
selection.push(song);
song.selected = true;
}
};
};
console.log(selection.length);
return selection;
};
var generateRandCoords = function(amount) {
var temp = [];
var randomPoint = function() {
return {
x: Math.round(Math.random() * 1000),
y: Math.round(Math.random() * 1000)
};
};
for (var i = 0; i < amount; i++) {
temp.push(randomPoint());
}
;
return temp;
};
var line = generateRandCoords(100);
var songs = generateRandCoords(100);
var timestamp = new Date().getTime();
computePlaylist(songs, line, 60);
console.log('execution time', new Date().getTime() - timestamp);
var timestamp = new Date().getTime();
computePlaylist2(songs, line, 60);
console.log('execution time2', new Date().getTime() - timestamp);
var timestamp = new Date().getTime();
computePlaylist3(songs, line, 60);
console.log('execution time3', new Date().getTime() - timestamp);
</script>
</body>
</html>
|
