/// <summary>
/// Create a new image for the picturebox
/// </summary>
private void UpdateImage()
{
if (!this.updateImage || this.tbxSampleText.Lines.Length == 0)
{
return;
}
using (Bitmap bmpFullSize = TextToImage.Convert(this.tbxSampleText.Text, this.tbxSampleText.Font, this.TextColor, this.BackgroundColor))
{
if (bmpFullSize == null)
{
return;
}
float magnification = this.Value / 100f;
Size newSize = new Size(
(int)(((float)bmpFullSize.Width * magnification) + 0.5f),
(int)(((float)bmpFullSize.Height * magnification) + 0.5f));
this.pbxOutputImage.Image = new Bitmap(newSize.Width, newSize.Height);
using (ImageAttributes ia = new ImageAttributes())
{
ia.SetColorMatrix(JMSoftware.Matrices.Grayscale());
using (Graphics g = Graphics.FromImage(this.pbxOutputImage.Image))
{
// select highest quality resize mode
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.DrawImage(
bmpFullSize,
new Rectangle(0, 0, newSize.Width, newSize.Height),
0,
0,
bmpFullSize.Width,
bmpFullSize.Height,
GraphicsUnit.Pixel,
ia);
}
}
}
this.updateImage = false;
this.pbxOutputImage.Refresh();
}
/// <summary>
/// Update Value for the passed font
/// </summary>
/// <param name="font">Font to be used</param>
public void CalculateValue(Font font)
{
using (Bitmap bitmap = TextToImage.Convert(this.Character.ToString(), font))
{
if (bitmap == null)
{
this.Value = -1;
return;
}
this.Width = bitmap.Width;
int total = 0;
unsafe
{
BitmapData data = bitmap.LockBits(
new Rectangle(new Point(0, 0), bitmap.Size),
ImageLockMode.ReadOnly,
PixelFormat.Format24bppRgb);
byte *pointer = (byte *)data.Scan0;
int padding = data.Stride - (bitmap.Width * 3);
for (int y = 0; y < bitmap.Height; y++)
{
for (int x = 0; x < bitmap.Width; x++)
{
total += (int)(((float)(pointer[2] + pointer[1] + pointer[0]) / 3f) + 0.5);
pointer += 3;
}
pointer += padding;
}
bitmap.UnlockBits(data);
}
this.Value = (int)(((float)total / (float)(this.Width * bitmap.Height)) + 0.5);
}
}
/// <summary>
/// Calculate the values for the current character
/// </summary>
/// <param name="font">font to be used</param>
public void CalculateValues(Font font)
{
// size of the shrunken character to use for the calculation
const int Width = 4;
const int Height = 4;
const float Area = 16f;
using (Bitmap bitmap = TextToImage.Convert(this.Character.ToString(), font))
{
using (Bitmap shrunk = new Bitmap(Width, Height))
{
using (Graphics g = Graphics.FromImage(shrunk))
{
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.Clear(Color.White);
g.DrawImage(bitmap, 0, 0, Width, Height);
}
unsafe
{
BitmapData data = shrunk.LockBits(
new Rectangle(new Point(0, 0), shrunk.Size),
ImageLockMode.ReadOnly,
PixelFormat.Format24bppRgb);
byte *pointer = (byte *)data.Scan0;
int padding = data.Stride - (shrunk.Width * 3);
int totalValue = 0;
for (int y = 0; y < shrunk.Height; y++)
{
for (int x = 0; x < shrunk.Width; x++)
{
totalValue += pointer[2];
pointer += 3;
}
pointer += padding;
}
// store the average value
this.Value = (int)(((float)totalValue / Area) + 0.5);
int totalDifference = 0;
pointer = (byte *)data.Scan0;
for (int y = 0; y < shrunk.Height; y++)
{
for (int x = 0; x < shrunk.Width; x++)
{
// add the difference between the average value and this pixel
totalDifference += this.Value > pointer[2] ? this.Value - pointer[2] : pointer[2] - this.Value;
pointer += 3;
}
pointer += padding;
}
// store the score for this character
this.Score = (int)(((float)totalDifference / Area) + 0.5);
shrunk.UnlockBits(data);
}
}
}
}