//Determining the color of the current pixel on account of the given position: inside start/end pixels or outside them
public Bitmap addColorToPixel(pixelInfo curPixelInfo, Bitmap curBitmap, List<Color> allColors, Encrypting curEncrypting)
{
bool noChange = false;
int curIndex = curPixelInfo.i;
if (curPixelInfo.startI > -1 && curIndex >= curPixelInfo.startI && curIndex <= curPixelInfo.endI)
{
noChange = true;
}
Color curColor = new Color();
if (!noChange)
{
//The current pixel is randomly assigned
curIndex = curPixelInfo.random.Next(0, allColors.Count - 1);
while (IO.twoColorsAreEqual(allColors[curIndex], curEncrypting.curHashing.startColor)) //StartColor determines where the encrypted chunk starts/ends and thus cannot be used outside it
{
curIndex = curPixelInfo.random.Next(0, allColors.Count - 1);
}
curColor = allColors[curIndex];
}
else
{
//This is part of the "encrypted chunk" and thus the pixels, as calculated so far, have to be added
curPixelInfo.encryptedAdded = true;
curIndex = curIndex - curPixelInfo.startI;
curColor = curEncrypting.encryptedString[curIndex];
if (curEncrypting.curHashing.startOffset.startOffsetCount == -1)
{
//There is no offset; thus the color in the "offset position" cannot be curEncrypting.curHashing.startOffset.afterOffset
if (twoColorsAreEqual(curColor, curEncrypting.curHashing.startOffset.afterOffset) && !curEncrypting.curHashing.startOffset.replaceAfter.Value.IsEmpty)
{
if (curEncrypting.encryptingNumber > 0 && curIndex == curEncrypting.encryptingNumber + 1)
{
curColor = curEncrypting.curHashing.startOffset.replaceAfter.Value;
}
}
}
}
curBitmap.SetPixel(curPixelInfo.x, curPixelInfo.y, curColor);
return curBitmap;
}
//Method called by the one above to actually create the image
private Bitmap createImage(int width, int height, Encrypting curEncrypting)
{
Hashing curHashing = curEncrypting.curHashing;
List<Color> allColors = curHashing.charsVsColors.Values.ToList(); //Colors being considered in the current encryption: neither their number nor their order is kept constant
curEncrypting = setBoundaryColors(curEncrypting); //Including the additional pixels surrounding the ones including the encrypted information
//Accounting for the fact that the default size (500*500) is not enough to store all the required information
int totSize = width * height;
if (totSize < curHashing.curLength)
{
double ratio = Math.Ceiling(Math.Sqrt(Math.Ceiling((double)allColors.Count / curHashing.curLength)));
height = Convert.ToInt32(Math.Ceiling(height * ratio));
width = Convert.ToInt32(Math.Ceiling(width * ratio));
}
Bitmap outBitmap = new Bitmap(width, height);
pixelInfo curPixel = new pixelInfo();
//Determining the start/end pixels (where the encrypted string + additional info will be located)
curPixel.startI = calculateStartI(width, height, curEncrypting);
if (curEncrypting.encryptedString != null) curPixel.endI = curPixel.startI + curEncrypting.encryptedString.Count - 1;
//Main loop populating the bitmap with all the pixels: ones containing encrypted information and all the other ones
curPixel.i = -1;
for (int x = 0; x < width; x++)
{
for (int y = 0; y < height; y++)
{
curPixel.i = curPixel.i + 1;
curPixel.x = x;
curPixel.y = y;
outBitmap = addColorToPixel(curPixel, outBitmap, allColors, curEncrypting);
}
}
return outBitmap;
}
