blob: 178891530a00e2a1b37585972b15726617d41be9 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
'use strict';
/* Services */
app.service('pathService', function() {
var self = {
dist: function(point1, point2) {
var dx = point1.x - point2.x;
var dy = point1.y - point2.y;
return Math.sqrt(dx * dx + dy * dy);
},
computePlaylist: function(songList, constrainList, duration) {
//compute distances from the constrain path
var maxDistOverall = Number.MIN_VALUE;
angular.forEach(songList, function(song){
song.minDist = Number.MAX_VALUE;
for(var i=0; i<constrainList.length;i++){
var point = constrainList[i];
var d = self.dist(song, point);
if(d < song.minDist){
song.minDist = d;
song.closest = point;
song.closestIndex = i;
}
}
if(song.minDist > maxDistOverall){
maxDistOverall = song.minDist;
}
});
//select the songs
var selection = [];
while(duration > 0 && songList.length > 0){
//randomly select one song
var index = Math.floor(Math.random()*songList.length);
var song = songList[index];
var ratio = song.minDist/maxDistOverall;
console.log(ratio);
//favor the ones closer to the path
var weight = 1 - ratio*ratio;
if(Math.random() < weight){
songList.splice(index, 1);
selection.push(song);
}
duration = 0;
}
selection.sort(function(item){ return item.closestIndex;});
console.log(selection);
return selection;
}
};
return self;
});
|
