protected BaseLayout(WordCloudInput wordCloud)
{
var size = new SizeD(wordCloud.Width, wordCloud.Height);
Surface = new RectangleD(new PointD(0, 0), size);
QuadTree = new QuadTree <LayoutItem>(Surface);
Center = new PointD(Surface.X + size.Width / 2, Surface.Y + size.Height / 2);
WordCloud = wordCloud;
}
static int Main(string[] args)
{
var command = new RootCommand
{
new Argument <FileInfo>("output",
() => new FileInfo(Path.Join(Environment.CurrentDirectory, "output.png")),
"Path to the output file, default is `output.png`.")
};
command.Description = "Takes words on input and generates word cloud as PNG from them.";
command.Handler = CommandHandler.Create <FileInfo>(output =>
{
// Process words on input.
var freqs = new Dictionary <string, int>();
var whitespaces = new Regex(@"\s+");
while (Console.ReadLine() is string line)
{
foreach (var word in whitespaces.Split(line))
{
if (!freqs.TryGetValue(word, out var freq))
{
freq = 0;
}
freqs[word] = freq + 1;
}
}
// Generate topic cloud.
var wordCloud = new WordCloudInput(
freqs.Select(p => new WordCloudEntry(p.Key, p.Value)))
{
Width = 1024,
Height = 256,
MinFontSize = 8,
MaxFontSize = 32
};
var sizer = new LogSizer(wordCloud);
using var engine = new SkGraphicEngine(sizer, wordCloud);
var layout = new SpiralLayout(wordCloud);
var wcg = new WordCloudGenerator <SKBitmap>(wordCloud, engine, layout);
// Draw the bitmap on white background.
using var final = new SKBitmap(wordCloud.Width, wordCloud.Height);
using var canvas = new SKCanvas(final);
canvas.Clear(SKColors.White);
canvas.DrawBitmap(wcg.Draw(), 0, 0);
// Save to PNG.
using var data = final.Encode(SKEncodedImageFormat.Png, 100);
using var writer = output.Create();
data.SaveTo(writer);
});
return(command.Invoke(args));
}
public LogSizer(WordCloudInput wordCloud)
{
fontDelta = wordCloud.MaxFontSize - wordCloud.MinFontSize;
minFontSize = wordCloud.MinFontSize;
var wordCounts = wordCloud.Entries.Select(e => e.Count).DefaultIfEmpty(0);
var minCount = wordCounts.Min();
var maxCount = wordCounts.Max();
minLog = Math.Log(minCount);
divisor = Math.Log(maxCount) - minLog;
}
public SkGraphicEngine(ISizer sizer, WordCloudInput wordCloud,
SKTypeface?font = null)
{
Sizer = sizer;
Bitmap = new SKBitmap(wordCloud.Width, wordCloud.Height);
canvas = new SKCanvas(Bitmap);
textPaint = new SKPaint
{
Color = SKColor.Parse(wordCloud.TextColor),
Typeface = font
};
this.wordCloud = wordCloud;
}
public SpiralLayout(WordCloudInput wordCloud) : base(wordCloud)
{
}