// Se puede jugar con las resoluciones de imagen para ver cual da mejores resultados?
public static Image Convert2ASCII(Image BW_Image, List <WeightedChar> characters, out List <List <string> > ResultText)
{
/*
* ALGORITHM:
*
* 1- Get target Image size (w=Width,h=Height)
* 2- Create Result Image with white background and size W = w*character_image_width
* H = h*character_image_height
* 3- Create empty string to hold the text
*
* 4- for (int j=0;j=target_Image_Height;j++) --> ALL ROWS
* 5- Create row text string
* for (int i=0;i=target_Image_Width;i++) --> ALL COLUMNS
* 6- Get target pixel weight
* 7- Get closest weight from character list
* 8- Paste character image in position w = i*character_image_width
* h = j*character_image_height
* ¡¡ Be careful with coordinate system when placing Images !!
* 9- Add (string)character to row text string
* 10- Add row text string to text holding string
* 11 - return resulting Image & Text
*/
Image ResultImage = new Bitmap(BW_Image.Width * characters[0].CharacterImage.Width, BW_Image.Height * characters[0].CharacterImage.Height);
Graphics drawing = Graphics.FromImage(ResultImage);
drawing.Clear(Color.White);
ResultText = new List <List <string> > {
};
Bitmap BlackAndWhite = (Bitmap)BW_Image;
for (int j = 0; j < BW_Image.Height; j++) // ROW
{
List <string> RowText = new List <string> {
};
for (int i = 0; i < BW_Image.Width; i++) // COLUMN
{
Color pixel = BlackAndWhite.GetPixel(i, j);
double targetvalue = (pixel.R
+ pixel.G
+ pixel.B) / 3;
WeightedChar closestchar = characters.Where(t => Math.Abs(t.Weight - targetvalue) == characters.Min(e => Math.Abs(e.Weight - targetvalue))).FirstOrDefault();
RowText.Add(closestchar.Character);
drawing.DrawImage(closestchar.CharacterImage, i * closestchar.CharacterImage.Width, j * closestchar.CharacterImage.Height);
}
ResultText.Add(RowText);
}
drawing.Dispose();
return((Image)ResultImage);
}
/*
* The methods contained in this class are executed at the inizialization
* of the program, as the results from their calculations are needed for
* the image conversion and are not user-dependent, thus not depending from
* the actions taken by the user.
*
* It essentially does, foreach ASCII character between 32-126, the following:
* - Calculate its weight, defined as: number of black pixels / number of pixels in character image
* Note: To understand the process in depth, please read the code and comments below.
* - Generate a square shaped image of the character, with the character in question located in the
* center of the image. The character is drawn in black on top of a white background.
* - Associate the character in question (char type) to its image and weight.
*
* All this character information (character, weight and image) is stored in a custom class (WeightedChar)
* which can hold the 3 properties.
*
* All the classes resulting from the calculations are stored in a List so we can access the results.
*/
public static List <WeightedChar> GenerateFontWeights() // Collect chars, their Images and weights in a list of WeightedChar
{
List <WeightedChar> WeightedChars = new List <WeightedChar>();
SizeF commonsize = GetGeneralSize(); // Get standard size (nxn square), which will be common to all CharImages
for (int i = 32; i <= 126; i++) // Iterate through Chars
{
var forweighting = new WeightedChar(); // New object to hold Image, Weight and Char of new character
char c = Convert.ToChar(i);
if (!char.IsControl(c))
{
forweighting.Weight = GetWeight(c, commonsize); // Get character weight
forweighting.Character = c.ToString(); // Get character representation (the actual char)
forweighting.CharacterImage = (Bitmap)HelperMethods.DrawText(c.ToString(), Color.Black, Color.White, commonsize); // Get character Image
}
WeightedChars.Add(forweighting);
}
WeightedChars = LinearMap(WeightedChars); // Linearly map character weights to be in the range 0-255 -> mapping linearly from: MinCalcWeight - MaxCalcWeight to 0-255;
// This is done to be able to directly map pixels to characters
return(WeightedChars);
}
