// ==UserScript==
// @name Last.fm Artist Playcount/Chart Position Graph
// @namespace http://abhin4v.myinfo.ws
// @include http://www.last.fm/artist/*
// @include http://www.last.fm/music/*
// @exclude http://www.last.fm/music/*/+*
// @exclude http://www.last.fm/artist/*/+*
// @exclude http://www.last.fm/music/*/*/+*
// @exclude http://www.last.fm/artist/*/*/+*
// @exclude http://www.last.fm/music/*/*/*/+*
// @exclude http://www.last.fm/artist/*/*/*/+*
// ==/UserScript==
(function() {
lastfmPlaycountsVariation = {
$x: function(p, context) {
if (!context) context = document;
var i, arr = [], xpr = document.evaluate(p, context, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
for (i = 0; item = xpr.snapshotItem(i); i++) arr.push(item);
return arr;
},
getUser: function() {
if (this.$x("/html/body/div/div/div[2]/ul/li[2]/a")[0].innerHTML == "Log in")
return '';
return this.$x("/html/body/div/div/div/div/a[2]")[0].innerHTML;
},
getArtist: function() {
return this.$x("/html/body/div[2]/div[3]/h1/a")[0].innerHTML;
},
getData: function(url, cb) {
//GM_log("url = "+url);
GM_xmlhttpRequest({
method: "GET",
url: url,
onload: function(xhr) {
if (xhr.status == 200) cb("(" + xhr.responseText + ")");
}
});
},
parseData: function(data) {
//GM_log(data);
data = eval(data);
window.setTimeout(function() {}, 1000);
var chartData = {'from':[],'playcount':[],'chartposition':[],'x':[],'y1':[],y2:[], 'ex':'','ey1':'',ey2:''};
var maxPlaycount = 0;
var maxChartposition = 0;
var maxFrom = parseInt(data.value.items[data.value.items.length-1].from);
var minFrom = parseInt(data.value.items[0].from);
beginDate = new Date(minFrom*1000);
endDate = new Date(maxFrom*1000);
var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
beginMonth = beginDate.getMonth();
endMonth = endDate.getMonth();
beginYear = beginDate.getFullYear();
endYear = endDate.getFullYear();
//GM_log(months[beginMonth]+ " " + beginYear);
//GM_log(months[endMonth]+ " " + endYear);
monthsCount = (endYear - beginYear)*12 + (endMonth - beginMonth);
chartMonths = [];
chartYears = [];
for (var i = 0; i < monthsCount; i++) {
if (i%3 == 0) chartMonths.push(months[(beginMonth + i)%12]);
else chartMonths.push('');
if (i%12 == 0) chartYears.push(beginYear + Math.floor(i/12));
else chartYears.push('');
}
chartMonths.push('');
chartYears.push('');
//GM_log(chartMonths);
data.value.items.forEach(
function(item) {
chartData.from.push(parseInt(item.from));
chartData.x.push(parseInt(item.from)-minFrom);
if (item.playcount != null) {
chartData.playcount.push(parseInt(item.playcount));
chartData.chartposition.push(parseInt(item.chartposition));
chartData.y1.push(parseInt(item.playcount));
if (maxPlaycount < parseInt(item.playcount)) maxPlaycount = parseInt(item.playcount);
if (maxChartposition < parseInt(item.chartposition)) maxChartposition = parseInt(item.chartposition);
}
else {
chartData.playcount.push(-1);
chartData.chartposition.push(-1);
chartData.y1.push(-1);
}
}
);
for (var i = 0; i < chartData.chartposition.length; i++) {
if (chartData.chartposition[i] != -1)
chartData.y2[i] = maxChartposition -(chartData.chartposition[i] - 1);
else
chartData.y2[i] = -1;
}
chartData.ex = lastfmPlaycountsVariation.simpleEncode(chartData.x, maxFrom-minFrom);
chartData.ey1 = lastfmPlaycountsVariation.simpleEncode(chartData.y1, maxPlaycount);
chartData.ey2 = lastfmPlaycountsVariation.simpleEncode(chartData.y2, maxChartposition);
//GM_log(chartData.ex);
//GM_log(chartData.ey1);
//GM_log(chartData.ey2);
/*chartData.cx = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
chartData.cy = lastfmPlaycountsVariation.compressData(chartData.ex, chartData.ey);
cmaxPlaycount = 0;
for (var i=0; i < chartData.cy.length; i++) {
var playcount = chartData.cx.indexOf(chartData.cy.charAt(i));
if (playcount > cmaxPlaycount) cmaxPlaycount = playcount;
}*/
//GM_log(chartData.cx);
//GM_log(chartData.cy);
insertHere = lastfmPlaycountsVariation.$x('/html/body/div[2]/div[5]/div/div[2]/div[2]/div/h3')[0];
maxHeight = (maxChartposition > maxPlaycount) ? maxChartposition : maxPlaycount;
//GM_log(maxPlaycount + " " + maxChartposition + " " + maxHeight);
width = parseInt(insertHere.offsetWidth) - 10;
height = Math.round(width/3) + 5;
chartImgUrl = 'http://chart.apis.google.com/chart?' +
'chs=' + width + 'x' + height + '&' +
'chd=s:' + chartData.ex + ',' + chartData.ey1 + ',' + chartData.ex + ',' + chartData.ey2 + '&' +
//'chtt=Playcount+over+time&' +
'cht=lxy&' +
'chm=r,E5ECF9,0,' + Math.round((1-10/maxChartposition)*100)/100 + ',1.00&' +
'chxt=x,x,y,r&' +
'chco=FF9933,6666CC,E5ECF9&' +
'chdl=Playcount|Chart Position|Top 10&' +
'chxl=' + '0:|' + chartMonths.join('|') +
'|1:|' + chartYears.join('|') +
'|2:|0|' + Math.floor(maxPlaycount/5) + '|' + Math.floor(2*maxPlaycount/5) + '|' + Math.floor(3*maxPlaycount/5) + '|' + Math.floor(4*maxPlaycount/5) + '|' + maxPlaycount +
'|3:|' + maxChartposition + '|' + Math.floor(4*maxChartposition/5) + '|' + Math.floor(3*maxChartposition/5) + '|' + Math.floor(2*maxChartposition/5) + '|' + Math.floor(maxChartposition/5) + '|1';
//GM_log(chartImgUrl);
d = document.createElement('div');
i = document.createElement('img');
h3 = document.createElement('h3');
h3.innerHTML = 'Artist Playcount/Chart Position Graph';
i.src = chartImgUrl;
i.style.padding = "2px";
i.style.backgroundColor = "#FFFFFF";
d.appendChild(h3);
d.appendChild(i);
insertHere.parentNode.insertBefore(d, insertHere);
},
simpleEncode: function(values,maxValue) {
var simpleEncoding = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
var chartData = [];
for (var i = 0; i < values.length; i++) {
var currentValue = values[i];
if (!isNaN(currentValue) && currentValue >= 0) {
chartData.push(simpleEncoding.charAt(Math.round((simpleEncoding.length-1) * currentValue / maxValue)));
} else {
chartData.push('_');
}
}
return chartData.join('');
},
compressData: function(x, y) {
var cy = [];
var simpleEncoding = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
for (var i = 0; i < simpleEncoding.length; i++) {
cy[i] = [];
}
for (var i = 0; i < x.length; i++) {
idx = simpleEncoding.indexOf(x.charAt(i));
cy[idx].push(simpleEncoding.indexOf(y.charAt(i)));
}
for (var i = 0; i < cy.length; i++) cy[i] = lastfmPlaycountsVariation.avg(cy[i]);
//GM_log(uneval(cy));
return(lastfmPlaycountsVariation.simpleEncode(cy, simpleEncoding.length-1));
},
avg: function(nums) {
sum = 0;
flag = 1;
for (var i = 0; i< nums.length; i++)
if (nums[i] != -1) {
sum += nums[i];
flag = 0;
}
if (flag) return(-1);
return(Math.round(sum/nums.length));
}
};
//insertHere = lastfmPlaycountsVariation.$x("/html/body/div/div[4]/div/div[2]/div[2]/div/h3")[0];
//insertHere.parentNode.insertBefore(document.createElement('div'), insertHere).innerHTML = "<canvas id='canvas' height='300' width='400'></canvas>";
user = lastfmPlaycountsVariation.getUser();
//GM_log("user = "+user);
if (user != '') {
artist = lastfmPlaycountsVariation.getArtist();
//GM_log("artist = "+artist);
dataURL = "http://pipes.yahoo.com/pipes/pipe.run?_id=DPyk_K9E3BGNzxTTDtXErg&_render=json&artist="+artist+"&user="+user;
lastfmPlaycountsVariation.getData(
dataURL,
lastfmPlaycountsVariation.parseData
);
}
})();
