using Spectrogram.Settings;

using System;

using System.Drawing;

namespace Spectrogram

{

public class Annotations

{

public static void drawTicks(Bitmap bmp, FftSettings fftSettings, DisplaySettings displaySettings)

{

Graphics gfx = Graphics.FromImage(bmp);

double tickSpacingSec = displaySettings.tickSpacingSec;

double tickSpacingHz = displaySettings.tickSpacingHz;

double horizontalTickSpacing = tickSpacingSec * fftSettings.sampleRate / fftSettings.step;

double firstFreqTick = fftSettings.FrequencyFromIndex(displaySettings.pixelLower) + tickSpacingHz;

double lastFreqTick = fftSettings.FrequencyFromIndex(displaySettings.pixelUpper) - tickSpacingHz;

for (double frequency = 0; frequency < fftSettings.maxFreq; frequency += tickSpacingHz)

{

if ((frequency < firstFreqTick) || (frequency > lastFreqTick))

continue;

int yPosition = bmp.Height - (fftSettings.IndexFromFrequency(frequency) - displaySettings.pixelLower);

Point p1 = new Point(bmp.Width - displaySettings.tickSize, yPosition);

Point p2 = new Point(bmp.Width, yPosition);

DrawLineWithShadow(gfx, p1, p2);

DrawTextWithShadow(gfx, Math.Round(frequency).ToString(), p1, displaySettings.tickFont, displaySettings.sfTicksRight);

}

for (double xPx = 0; xPx < bmp.Width; xPx += horizontalTickSpacing)

{

Point p1 = new Point((int)xPx, bmp.Height);

Point p2 = new Point((int)xPx, bmp.Height - displaySettings.tickSize);

DrawLineWithShadow(gfx, p1, p2);

}

}

static void DrawTextWithShadow(Graphics gfx, string s, Point pt, Font fnt, StringFormat sf)

{

for (int dX = -1; dX < 2; dX++)

for (int dY = -1; dY < 2; dY++)

gfx.DrawString(s, fnt, Brushes.Black, pt.X + dX, pt.Y + dY, sf);

gfx.DrawString(s, fnt, Brushes.White, pt, sf);

}

static void DrawLineWithShadow(Graphics gfx, Point p1, Point p2)

{

Pen penShadow = new Pen(Brushes.Black, 3);

Pen penTick = new Pen(Brushes.White, 1);

penShadow.EndCap = System.Drawing.Drawing2D.LineCap.Round;

penTick.EndCap = System.Drawing.Drawing2D.LineCap.Round;

gfx.DrawLine(penShadow, p1, p2);

gfx.DrawLine(penTick, p1, p2);

}

}

}