public void Update(FastImage image, int posX, int posY)
{
if (posX < 1)
{
posX = 1;
}
if (posY < 1)
{
posY = 1;
}
var pixelSize = Math.Min(3, image.PixelFormatSize);
for (var i = posY; i < image.Height; ++i)
{
for (var j = posX; j < image.Width; ++j)
{
byte pixel = 0;
for (var p = 0; p < pixelSize; ++p)
{
pixel |= image.Data[i * image.Stride + j * image.PixelFormatSize + p];
}
this.Integral[j, i] = pixel + this.Integral[j - 1, i] + this.Integral[j, i - 1] - this.Integral[j - 1, i - 1];
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="WordCloud" /> class.
/// </summary>
/// <param name="width">The width of word cloud.</param>
/// <param name="height">The height of word cloud.</param>
/// <param name="useRank">if set to <c>true</c> will ignore frequencies for best fit.</param>
/// <param name="fontColor">Color of the font.</param>
/// <param name="maxFontSize">Maximum size of the font.</param>
/// <param name="fontStep">The font step to use.</param>
/// <param name="mask">mask image</param>
/// <param name="allowVerical">allow vertical text</param>
/// <param name="fontname">name of the font</param>
public WordCloud(int width, int height, bool useRank = false, Color?fontColor = null, float maxFontSize = -1,
int fontStep = 1, Image mask = null, bool allowVerical = false, string fontname = null)
{
if (mask == null)
{
Map = new OccupancyMap(width, height);
WorkImage = new FastImage(width, height, PixelFormat.Format32bppArgb);
}
else
{
mask = Util.ResizeImage(mask, width, height);
if (!Util.CheckMaskValid(mask))
{
throw new Exception("Mask is not a valid black-white image");
}
Map = new OccupancyMap(mask);
WorkImage = new FastImage(mask);
}
MaxFontSize = maxFontSize < 0 ? height : maxFontSize;
FontStep = fontStep;
_mFontColor = fontColor;
UseRank = useRank;
Random = new Random(Environment.TickCount);
AllowVertical = allowVerical;
Fontname = fontname;
#if DEBUG
_drawWaitHandle = new AutoResetEvent(false);
StepDrawMode = false;
#endif
}
public IntegralImage(FastImage image)
{
this.Integral = new uint[image.Width, image.Height];
this.OutputImgWidth = image.Width;
this.OutputImgHeight = image.Height;
InitMask(image);
}
internal static FastImage CropImage(FastImage img)
{
var cropRect = new Rectangle(1, 1, img.Width - 1, img.Height - 1);
var src = img.Bitmap;
var target = new Bitmap(cropRect.Width, cropRect.Height);
using (var g = Graphics.FromImage(target))
{
g.DrawImage(src, new Rectangle(0, 0, target.Width, target.Height),
cropRect,
GraphicsUnit.Pixel);
}
return(new FastImage(target));
}
private void InitMask(FastImage image)
{
Update(Util.CropImage(image), 1, 1);
}
