/// <summary>
/// Gets a bitmap with the RGB histograms
/// </summary>
/// <returns>Three histograms for R, G and B values in the Histogram</returns>
public Bitmap Visualize()
{
int oneColorHeight = 100;
int margin = 10;
float[] maxValues = new float[] { Red.Max(), Green.Max(), Blue.Max() };
byte[][] values = new byte[][] { Red, Green, Blue };
Bitmap histogramBitmap = new Bitmap(276, oneColorHeight * 3 + margin * 4);
Graphics g = Graphics.FromImage(histogramBitmap);
g.FillRectangle(Brushes.White, 0, 0, histogramBitmap.Width, histogramBitmap.Height);
int yOffset = margin + oneColorHeight;
for (int i = 0; i < 256; i++)
{
for (int color = 0; color < 3; color++)
{
g.DrawLine(p[color], margin + i, yOffset * (color + 1), margin + i, yOffset * (color + 1) - (values[color][i] / maxValues[color]) * oneColorHeight);
}
}
for (int i = 0; i < 3; i++)
{
g.DrawString(p[i].Color.ToKnownColor() + ", max value: " + maxValues[i], SystemFonts.SmallCaptionFont, Brushes.Silver, margin + 11, yOffset * i + margin + margin + 1);
g.DrawString(p[i].Color.ToKnownColor() + ", max value: " + maxValues[i], SystemFonts.SmallCaptionFont, Brushes.Black, margin + 10, yOffset * i + margin + margin);
g.DrawRectangle(p[i], margin, yOffset * i + margin, 256, oneColorHeight);
}
g.Dispose();
return(histogramBitmap);
}
/// <summary>
/// Gets a bitmap with the RGB histograms
/// </summary>
/// <returns>Three histograms for R, G and B values in the Histogram</returns>
public Image <Rgba32> Visualize()
{
int oneColorHeight = 100;
int margin = 10;
float[] maxValues = new float[] { Red.Max(), Green.Max(), Blue.Max() };
byte[][] values = new byte[][] { Red, Green, Blue };
Image <Rgba32> histogramBitmap = new Image <Rgba32>(276, oneColorHeight * 3 + margin * 4);
///Graphics g = Graphics.FromImage(histogramBitmap);
var rect = new RectangleF(0, 0, histogramBitmap.Width, histogramBitmap.Height);
histogramBitmap.Mutate(ctx => ctx.Fill(Rgba32.White, rect));
int yOffset = margin + oneColorHeight;
for (int i = 0; i < 256; i++)
{
for (int color = 0; color < 3; color++)
{
PointF[] points =
{
new PointF(margin + i, yOffset * (color + 1)),
new PointF(margin + i, yOffset * (color + 1) - (values[color][i] / maxValues[color]) * oneColorHeight)
};
histogramBitmap.Mutate(ctx => ctx.DrawLines(p[color], points));
}
}
for (int i = 0; i < 3; i++)
{
var point = new PointF(margin + 11, yOffset * i + margin + margin + 1);
histogramBitmap.Mutate(ctx => ctx.DrawText(penNames[i] + ", max value: " + maxValues[i], smallCaptionFont, Rgba32.Silver, point));
point = new PointF(margin + 10, yOffset * i + margin + margin);
histogramBitmap.Mutate(ctx => ctx.DrawText(penNames[i] + ", max value: " + maxValues[i], smallCaptionFont, Rgba32.Black, point));
rect = new RectangleF(margin, yOffset * i + margin, 256, oneColorHeight);
histogramBitmap.Mutate(ctx => ctx.Draw(p[i], rect));
}
return(histogramBitmap);
}
