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SkyForm.cs
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SkyForm.cs
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namespace WinFormsApp1
{
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;
/// <summary>
/// Simulate the atmosphere.
/// </summary>
public partial class SkyForm
{
/// <summary>
/// The gases we want to display, along with their relevant ratios and colours.
/// </summary>
private static readonly Gas[] Gases = new Gas[]
{
new Gas(GasIndex.GAS_N2, "Nitrogen", 78.0 / 100.0, Color.Silver, Color.Silver.ToArgb()),
new Gas(GasIndex.GAS_O2, "Oxygen", 21.0 / 100.0, Color.Goldenrod, Color.Goldenrod.ToArgb()),
new Gas(GasIndex.GAS_Ar, "Argon", 1.0 / 100.0, Color.Gold, Color.Gold.ToArgb()),
new Gas(GasIndex.GAS_H20, "Water", 2.0 / 100.0, Color.Blue, Color.Blue.ToArgb()),
new Gas(GasIndex.GAS_CO2, "CO2", 400.0 / 1000000.0, Color.Green, Color.Green.ToArgb()),
new Gas(GasIndex.GAS_ACO2, "Human CO2", 15.0 / 1000000.0, Color.Red, Color.Red.ToArgb()),
};
/// <summary>
/// Image sizes we support.
/// </summary>
/// <remarks>
/// Ideally, these should be convenient multiples of 1 million pixels. In practice, the various 16x9 formats are
/// a little bit over.
/// </remarks>
private static readonly SupportedSize[] Sizes =
{
new SupportedSize(1280, 800, 20, "WXGA / ~1 Megapixel"),
new SupportedSize(1000, 1000, 20, "1 Megapixel"),
new SupportedSize(1600, 1200, 40, "UXGA / ~2 Megapixels"),
new SupportedSize(1920, 1080, 40, "Full HD / ~2 Megapixels"),
new SupportedSize(1920, 1200, 40, "WUXGA / ~2 Megapixels"),
new SupportedSize(2048, 1080, 40, "QWXGA / 2K / ~2 Megapixels"),
new SupportedSize(2560, 1080, 80, "UW-FHD 21:9 / ~2.8 Megapixels"),
new SupportedSize(2500, 1600, 80, "4 Megapixels"),
new SupportedSize(2560, 1600, 80, "WQXGA / 4 Megapixels"),
new SupportedSize(3840, 2160, 160, "4K UHD / ~8 Megapixels"),
new SupportedSize(5120, 2160, 160, "UW5K / ~11 Megapixels"),
new SupportedSize(5000, 3200, 160, "16 Megapixels"),
new SupportedSize(5120, 2880, 160, "5K / ~15 Megapixels"),
new SupportedSize(5120, 3200, 160, "WHXGA / ~16 Megapixels"),
new SupportedSize(7680, 4320, 500, "8K / ~32 Megapixels"),
new SupportedSize(8120, 4320, 500, "Full 8K / ~35 Megapixels"),
new SupportedSize(10240, 4320, 500, "UW 10K / ~44 Megapixels"),
new SupportedSize(15360, 8640, 1000, "16K / ~132 Megapixels"),
};
private static readonly int[] SpaceRatios =
{
20,
40,
80,
100,
120,
160,
200,
240,
300,
320,
400,
500,
600,
800,
1000
};
private static SupportedSize defaultSize = Sizes[0];
readonly bool _initialized;
/// <summary>
/// SkyForm Constructor.
/// </summary>
/// <remarks>
/// Sizes and gases should probably go into a settings file.
/// </remarks>
public SkyForm()
{
InitializeComponent();
AddSizeMenuItems();
AddSpaceRatioMenuItems();
AddHandlers();
_initialized = true;
PaintMe();
}
/// <summary>
/// Add event handlers as the last initialisation step so that we don't have clicky user slowing down the process.
/// </summary>
void AddHandlers()
{
this.saveAs.Click += SaveAs_Click;
this.humanCO2HighlightSelector.CheckedChanged += (s, e) => this.PaintMe();
this.cO2HighlightSelector.CheckedChanged += (s, e) => this.PaintMe();
this.DarkMode.Click += (s, e) =>
{
this.DarkMode.Checked = true;
this.LightMode.Checked = false;
BackgroundColour = Color.Black;
PaintMe();
};
this.LightMode.Click += (s, e) =>
{
this.DarkMode.Checked = false;
this.LightMode.Checked = true;
BackgroundColour = Color.White;
PaintMe();
};
this.PictureBox1.MouseDoubleClick += (s, e) => PaintMe();
this.PictureBox1.MouseMove += (s, e) => mouseLocation.Text = $"Mouse:({e.X},{e.Y});";
}
/// <summary>
/// Use the size list to generate a menu item for each size.
/// </summary>
private void AddSizeMenuItems()
{
foreach (var size in Sizes)
{
sizeSelector.DropDownItems.Add(CreateSizeMenuItem(size));
}
}
/// <summary>
/// Use the size list to generate a menu of gas:space ratios to offer.
/// </summary>
private void AddSpaceRatioMenuItems()
{
foreach (int ratio in SpaceRatios)
{
spaceRatioSelector.DropDownItems.Add(CreateSpaceRatioMenuItem(ratio));
}
}
/// <summary>
/// Change the canvas size and space ratio.
/// </summary>
/// <param name="width"></param>
/// <param name="height"></param>
/// <param name="spaceRatio"></param>
private void ChangePictureSize(int width, int height, int spaceRatio)
{
CanvasSize = new Size(width, height);
SpaceRatio = spaceRatio;
this.PictureBox1.Size = CanvasSize;
this.PaintMe();
this.Invalidate();
}
/// <summary>
/// Create a menu item for a specific canvas size.
/// </summary>
/// <param name="size"></param>
/// <returns></returns>
private ToolStripMenuItem CreateSizeMenuItem(SupportedSize size)
{
string menuText = $"{size.Width}x{size.Height} ({size.Name})";
return new ToolStripMenuItem(menuText, (Image)null, SizeMenuItem_Clicked(size))
{
Checked = CanvasSize == size.CanvasSize,
Tag = size.DefaultSpaceRatio.ToString()
};
}
/// <summary>
/// Create a menu item for a specific space ratio.
/// </summary>
/// <param name="spaceRatio"></param>
/// <returns></returns>
private ToolStripMenuItem CreateSpaceRatioMenuItem(int spaceRatio)
{
return new ToolStripMenuItem(spaceRatio.ToString(), (Image)null, SpaceRatio_Clicked(spaceRatio))
{
Checked = spaceRatio == SpaceRatio,
};
}
/// <summary>
/// Draw a primitive circle around a pixel.
/// </summary>
/// <param name="bitmap"></param>
/// <param name="colour"></param>
/// <param name="x"></param>
/// <param name="y"></param>
private static void EncirclePixel(Bitmap bitmap, Color colour, int x, int y)
{
bitmap.SetPixel(x - 2, y - 1, colour);
bitmap.SetPixel(x - 2, y, colour);
bitmap.SetPixel(x - 2, y + 1, colour);
bitmap.SetPixel(x - 1, y + 2, colour);
bitmap.SetPixel(x, y + 2, colour);
bitmap.SetPixel(x + 1, y + 2, colour);
bitmap.SetPixel(x + 2, y + 1, colour);
bitmap.SetPixel(x + 2, y, colour);
bitmap.SetPixel(x + 2, y - 1, colour);
bitmap.SetPixel(x + 1, y - 2, colour);
bitmap.SetPixel(x, y - 2, colour);
bitmap.SetPixel(x - 1, y - 2, colour);
}
/// <summary>
/// Paint the actual image.
/// </summary>
/// <remarks>
/// This is down by drawing individual pixels to an in-memory image and then displaying the completed
/// image.
/// </remarks>
private void PaintMe()
{
if (!_initialized)
return;
Bitmap bitmap = new(CanvasSize.Width, CanvasSize.Height);
var graphics = Graphics.FromImage(bitmap);
GasStatusLabel.Text = "Gases: ";
humanLocations.Text = "Man: ";
int bgi = BackgroundColour.ToArgb();
graphics.Clear(BackgroundColour);
var capacity = (CanvasSize.Width * CanvasSize.Height);
int totalGasMolecules = 0;
Random randomizer = new((int)(DateTime.Now.Ticks & 0x7FFFFFFF));
foreach (var gas in Gases) // .OrderBy(g => g.Ratio))
{
int molecules = (int)Math.Round(capacity * gas.Ratio / SpaceRatio, 0, MidpointRounding.AwayFromZero);
GasStatusLabel.Text += $"{gas.Name}: {molecules}; ";
int overwrites = 0;
for (int c = 0; c < molecules; c += 1)
{
int x = randomizer.Next(1, CanvasSize.Width);
int y = randomizer.Next(1, CanvasSize.Height);
int escape = 0;
int pixel = bitmap.GetPixel(x, y).ToArgb();
while (pixel != bgi)
{
// escape if we've tried too many times and our current attempt is
// the same colour.
if (++escape >= SpaceRatio && pixel == gas.ARGB)
{
// Debug.Print($"{escape} - ({x},{y})");
overwrites++;
break;
}
x += randomizer.Next(-SpaceRatio, SpaceRatio);
y += randomizer.Next(-SpaceRatio, SpaceRatio);
if (x < 0)
x = CanvasSize.Width + x;
if (y < 0)
y = CanvasSize.Height + y;
if (x >= CanvasSize.Width)
x -= CanvasSize.Width;
if (y >= CanvasSize.Height)
y -= CanvasSize.Height;
pixel = bitmap.GetPixel(x, y).ToArgb();
}
bitmap.SetPixel(x, y, gas.Colour);
if (gas.Index == GasIndex.GAS_ACO2)
{
humanLocations.Text += $"({x},{y});";
}
if ((gas.Index == GasIndex.GAS_CO2 && this.cO2HighlightSelector.Checked) ||
(gas.Index == GasIndex.GAS_ACO2 && this.humanCO2HighlightSelector.Checked))
{
EncirclePixel(bitmap, gas.Colour, x, y);
}
if (overwrites > 0)
{
System.Diagnostics.Debug.Print($"{gas.Name} overwrites: {overwrites}");
}
}
totalGasMolecules += molecules;
}
GasStatusLabel.Text += $"Canvas size: {capacity:0,000}; ";
GasStatusLabel.Text += $"Total molecules: {totalGasMolecules:0,000}; ";
GasStatusLabel.Text += $"Total space: {(capacity - totalGasMolecules):0,000}.";
PictureBox1.Image = bitmap;
this.Invalidate();
}
/// <summary>
/// Save the current image to a file.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void SaveAs_Click(object sender, EventArgs e)
{
using (var sfd = new SaveFileDialog()
{
AddExtension = true,
CheckPathExists = true,
DefaultExt = "BMP",
Filter = "PNG Files|*.PNG",
OverwritePrompt = true,
Title = "Save image"
})
{
if (sfd.ShowDialog() == DialogResult.OK)
{
this.PictureBox1.Image.Save(sfd.FileName, ImageFormat.Png);
}
}
}
/// <summary>
/// Creates an event handler for when a Canvas Size menu item is clicked
/// </summary>
/// <param name="size"></param>
/// <returns></returns>
private EventHandler SizeMenuItem_Clicked(SupportedSize size)
{
return (s, e) =>
{
ToolStripMenuItem mi = s as ToolStripMenuItem;
ChangePictureSize(size.CanvasSize.Width, size.CanvasSize.Height, size.DefaultSpaceRatio);
foreach (ToolStripMenuItem ddi in sizeSelector.DropDownItems)
{
ddi.Checked = ddi == mi;
}
foreach (ToolStripMenuItem ddi in spaceRatioSelector.DropDownItems)
{
ddi.Checked = string.Equals(ddi.Text, mi.Tag);
}
PaintMe();
};
}
/// <summary>
/// Creates an event handler for when a Space Ratio menu item is clicked.
/// </summary>
/// <param name="ratio"></param>
/// <returns></returns>
private EventHandler SpaceRatio_Clicked(int ratio)
{
return (s, e) =>
{
ToolStripMenuItem mi = s as ToolStripMenuItem;
SpaceRatio = ratio;
foreach (ToolStripMenuItem ddi in spaceRatioSelector.DropDownItems)
{
ddi.Checked = ddi == mi;
}
PaintMe();
};
}
private Color BackgroundColour { get; set; } = Color.Black;
private Size CanvasSize { get; set; } = defaultSize.CanvasSize;
private int SpaceRatio { get; set; } = defaultSize.DefaultSpaceRatio;
}
/// <summary>
/// Enum for the gases we're mapping.
/// </summary>
/// <remarks>
/// These are mostly of interest for the CO2 items, which can be highlighted.
/// </remarks>
internal enum GasIndex
{
GAS_N2,
GAS_O2,
GAS_Ar,
GAS_H20,
GAS_CO2,
GAS_ACO2,
}
/// <summary>
/// Describes a canvas size and default "space ratio" for the canvas size.
/// </summary>
/// <remarks>
/// Gas Density:
/// <para>
/// Paraphrased from https://personal.ems.psu.edu/~bannon/moledyn.html:
/// </para>
/// <para>
/// <em>
/// Air molecules take up only 0.1% of the volume they occupy.
/// Thus air is a very sparse gas in which 99.9% of the atmosphere is vacuum.
/// </em>
/// </para>
/// <para>
/// So the 'technically correct 'Space Ratio' is 1000, i.e. only one in a 1000 pixels
/// should be set. However, this doesn't necessarily visualise well, so we set smaller
/// values that allow the visualisation of the space between atoms, even if they're
/// not quite big enough.
/// </para>
/// </remarks>
internal record struct SupportedSize(int Width, int Height, int DefaultSpaceRatio, string Name)
{
public readonly Size CanvasSize => new(Width, Height);
}
/// <summary>
/// Describes a gas's name and ratio in the atmosphere, with some colour settings for
/// making the image.
/// </summary>
/// <param name="Index"></param>
/// <param name="Name"></param>
/// <param name="Ratio"></param>
/// <param name="Colour"></param>
/// <param name="ARGB"></param>
internal record struct Gas(GasIndex Index, string Name, double Ratio, Color Colour, int ARGB)
{
}
}