public async void WriteImageFile(
string filePath,
int width,
int height,
float offsetElevation,
Vector2 lerpElevation,
System.Action onFinish = null
)
{
//get file path from user:
{
if (filePath.Length == 0)
{
Debug.Log("Cancelled by user");
return;
}
if (IO.File.Exists(filePath) == false)
{
Debug.LogError($"File not found: { filePath }");
return;
}
}
//prepare samples:
Debug.Log($"Creating image...\nsource: { filePath }");
ushort[] pixels;
{
pixels = new ushort[height * width];
IO.FileStream stream = null;
IO.StreamReader reader = null;
await Task.Run(() => {
try
{
stream = new IO.FileStream(
filePath,
IO.FileMode.Open,
IO.FileAccess.Read,
IO.FileShare.Read
);
reader = new IO.StreamReader(stream);
int index = 0;
//
string line = null;
while ((line = reader.ReadLine()) != null)
{
if (line.Length != 0)
{
//calc color value:
float elevation = float.Parse(line) + offsetElevation;
float inverselerped = Mathf.InverseLerp(
lerpElevation.x,
lerpElevation.y,
elevation
);
ushort color = (ushort)(inverselerped * ushort.MaxValue);
// find pixel position
int X = (width - 1) - index % width;
int Y = (height - 1) - index / width;
// set pixel color
pixels[Y *width + X] = color;
//step
index++;
}
}
}
catch (System.Exception ex) { Debug.LogException(ex); }
finally
{
if (stream != null)
{
stream.Close();
}
if (reader != null)
{
reader.Close();
}
}
});
}
//write bytes to file:
{
string pngFilePath = $"{ filePath.Replace(".csv","") } offset({ offsetElevation }) invlerp({ lerpElevation.x },{ lerpElevation.y }).png";
Debug.Log($"\twriting to PNG file: { pngFilePath }");
await PNG.WriteGrayscaleAsync(
pixels : pixels,
width : width,
height : height,
alpha : false,
filePath : pngFilePath
);
filePath = null;
Debug.Log($"\tPNG file ready: { pngFilePath }");
}
//call on finish:
if (onFinish != null)
{
onFinish();
}
}
