private static void computeLevels()
{
grayLevels = new int[AsciiArt.characterSet.Length];
Font font = AsciiArt.GetFont();
glyphs = new List <Glyph>();
for (int lvl = 0; lvl < AsciiArt.characterSet.Length; lvl++)
{
string s = AsciiArt.characterSet[lvl].ToString();
Bitmap bmp = new Bitmap(100, 100);
Graphics g = Graphics.FromImage(bmp);
g.Clear(Color.White);
g.DrawString(s, font, Brushes.Black, 0, 0);
int width = (int)g.MeasureString("#", font).Width - 2;
int height = (int)g.MeasureString("#", font).Height;
int totalGray = 0;
for (int x = 0; x < width; x++)
{
for (int y = 0; y < height; y++)
{
Color col = bmp.GetPixel(x, y);
int value = Draw.RgbToGray(col.R, col.G, col.B);
totalGray += value;
}
}
int grayLevel = (int)(255f * (float)totalGray / (float)(width * height * 255));
glyphs.Add(new Glyph(characterSet[lvl], grayLevel));
}
glyphs.Sort(delegate(Glyph g1, Glyph g2) { return(g1.level.CompareTo(g2.level)); });
levelsComputed = true;
}
private void btnConvert_Click(object sender, EventArgs e)
{
int w = 100, h = 100;
int.TryParse(txtWidth.Text, out w);
int.TryParse(txtHeight.Text, out h);
string text = AsciiArt.Process(inputImage, w, h, textParam.Text);
Font fnt = AsciiArt.GetFont();
Output dlgOut = new Output();
dlgOut.WndText = text;
dlgOut.Fnt = fnt;
dlgOut.ShowDialog();
}
/// <summary>
/// Converts the given input bitmap into an ASCCI art string.
/// </summary>
/// <param name="src">Source image.</param>
/// <param name="width">Required output width in characters.</param>
/// <param name="height">Required output height in characters.</param>
/// <param name="param">Textual parameter.</param>
/// <returns>String (height x width ASCII table)</returns>
public static string Process(Bitmap src, int width, int height, string param)
{
// !!!{{ TODO: replace this with your own bitmap -> ASCII conversion code
if (src == null || width <= 0 || height <= 0)
{
return("");
}
float widthBmp = src.Width;
float heightBmp = src.Height;
if (param.Length > 1)
{
characterSet = param.ToCharArray();
}
else
{
characterSet = defaultCharacterSet;
}
//if (! levelsComputed)
AsciiArt.computeLevels();
// preprocess
Rectangle rectangle = new Rectangle(0, 0, src.Width, src.Height);
System.Drawing.Imaging.BitmapData bitmapDataIn = src.LockBits(rectangle
, System.Drawing.Imaging.ImageLockMode.ReadOnly
, src.PixelFormat);
IntPtr ip = bitmapDataIn.Scan0;
Bitmap img = Preprocessing.Preprocess(ip, (int)widthBmp, (int)heightBmp);
src.UnlockBits(bitmapDataIn);
StringBuilder sb = new StringBuilder();
for (int y = 0; y < height; y++)
{
float fYBmp = y * heightBmp / height;
for (int x = 0; x < width; x++)
{
float fXBmp = x * widthBmp / width;
Color c = img.GetPixel((int)fXBmp, (int)fYBmp);
int luma = c.R; // all channels are the same, img is in grayscale // Draw.RgbToGray(c.R, c.G, c.B);
// Alternative (luma): Y = 0.2126 * R + 0.7152 * G + 0.0722 * B
//int luma = (54 * (int)c.R + 183 * (int)c.G + 19 * (int)c.B) >> 8;
//sb.Append( (luma < 140) ? ((luma < 90)?MAX_LEVEL:MID_LEVEL) : MIN_LEVEL );
sb.Append(AsciiArt.getCharAtLevel(luma));
}
sb.Append("\r\n");
}
// !!!}}
return(sb.ToString());
}