private static void TestGenerateBasicMap()
{
var buffer = new Rgba32[width * height];
fn.SetFractalOctaves(6);
fn.SetFrequency(0.0007f);
for (int i = 0; i < buffer.Length; i++)
{
var p0 = ArrayIndex.From1DTo2D(i, width);
var pixelValue = fn.GetCellular(p0.X, p0.Y);
if (pixelValue > 0)
{
buffer[i] = new Rgba32(pixelValue, 10 + 1.0f * pixelValue, 0.0f);
}
else
{
buffer[i] = new Rgba32(pixelValue, 0.0f, 10 + 1.0f * pixelValue);
}
}
var time = DateTime.UtcNow.ToString("s", System.Globalization.CultureInfo.InvariantCulture).Replace(":", "-");
CreateDirectoryIfNotExists("./data");
//ImageWriter.FastWrite(ref buffer, $"./data/TestGenerateBasicMap-{time}.png", width, height);
}
private static void TestIntensityImage()
{
var buffer = new Rgba32[width * height];
Func <double, double, double, double> getCentralIntensity = (r, i0, k) => i0 *Math.Exp(-k *Math.Pow(r, 0.25));
Func <double, double, double, double> getOuterIntensity = (r, i0, a) => i0 *Math.Exp(-r / a);
Func <double, double> getSurfaceBrightness = (r) => {
double i0 = 1.0, k = 0.02, a = 200;
double bulgeradius = (width + height) * 0.05;
return(r < bulgeradius?getCentralIntensity(r, i0, k) :
getOuterIntensity(r - bulgeradius, getCentralIntensity(bulgeradius, i0, k), a));
};
for (int i = 0; i < width * height; i++)
{
var p0 = ArrayIndex.From1DTo2D(i, width);
var distance = (p0 - new Vector2(width / 2, height / 2)).Length();
var intensity = (float)Math.Clamp(getSurfaceBrightness(distance), 0, 1);
var color = new Rgba32(intensity, intensity, intensity);
buffer[i] = color;
}
var time = DateTime.UtcNow.ToString("s", System.Globalization.CultureInfo.InvariantCulture).Replace(":", "-");
CreateDirectoryIfNotExists("./data");
// ImageWriter.FastWrite(ref buffer, $"./data/TestIntensityImage-{time}.png", width, height);
}
public static void Write(ref int[] buffer, string file, int width, int height)
{
var image = new System.Drawing.Bitmap(width, height);
for (int i = 0; i < buffer.Length - 1; i++)
{
var index = ArrayIndex.From1DTo2D(i, width);
var color = Color.FromArgb(buffer[i], buffer[i], buffer[i]);
image.SetPixel((int)index.X, (int)index.Y, color);
}
image.Save(file);
}
public void UpdateCanvas(ref Rgba32[] canvas, ref float[] positionX, ref float[] positionY)
{
for (int i = 0; i < numParticles; i++)
{
var x = (int)positionX[i];
var y = (int)positionY[i];
if (x < width && y < height)
{
var index = ArrayIndex.From2DTo1D(x, y, width);
canvas[index] = new Rgba32(255, 255, 255, 255);
}
}
}
internal void Update(ref float[] positionX, ref float[] positionY)
{
frame = new Image <Rgba32>(width, height);
var pixels = frame.GetPixelSpan();
for (int i = 0; i < positionX.Length; i++)
{
var px = wrapAround(positionX[i], width - 1);
var py = wrapAround(positionY[i], height - 1);
var index = ArrayIndex.From2DTo1D((int)px, (int)py, width);
pixels[index] = new Rgba32(255, 255, 255);
}
}