private void RenderImage()
{
Options o = GetOptions();
try
{
tslInfo.Text = "";
// Validate number of vertices per tile
int k = o.VerticesPerTile & (o.VerticesPerTile - 1);
if (k != 0)
{
throw new Exception($"VerticesPerTile value { o.VerticesPerTile} must be a power of 2.");
}
// Validate number of vertices per tile
if (o.VerticesPerTile < 8)
{
throw new Exception($"VerticesPerTile value { o.VerticesPerTile} must be greater than or equal to 8.");
}
// load
FIBITMAP dib = FreeImage.LoadEx(o.Filename);
// calc resolution of tile
int tileSizeResolution = o.VerticesPerTile - 1;
// show tiles
FREE_IMAGE_TYPE it = FreeImage.GetImageType(dib);
uint bpp = FreeImage.GetBPP(dib);
// Warn if bits-per-pixel is less than 16
if (bpp != 16)
{
tslInfo.Text = $"Warning! The image provided it's not 16 bits per pixel. 16 bpp grayscale image needed.";
}
// get height range
var range = dib.GetHeightRange();
// load image
groupBox1.Text = $"{Path.GetFileName(o.Filename)}, {FreeImage.GetWidth(dib)}x{FreeImage.GetHeight(dib)}, {bpp} bpp, low: {range.X}, high: {range.Y}";
// preview
if (!o.SkipPreview)
{
Image i = Image.FromFile(o.Filename);
Bitmap bmp = new Bitmap(i);
Graphics g = Graphics.FromImage(bmp);
var tiles = MathEx.GetTiles(bmp.Width, bmp.Height, tileSizeResolution);
foreach (var item in tiles)
{
g.DrawRectangle(Pens.LightGreen, item);
}
// show craters
// craterize
if (o.Craters > 0)
{
ce = new CraterEngine()
{
dib = dib, minRadius = o.CraterMinRadius, maxRadius = o.CraterMaxRadius, numCraters = o.Craters, seed = o.Seed
};
ce.BuildCraters();
foreach (var crater in ce.craters)
{
foreach (var item in crater.craterRidgePoints)
{
bmp.SetPixel((int)item.X, (int)item.Y, Color.Red);
}
}
}
// show image
pictureBox1.Image = bmp;
}
// free
FreeImage.Unload(dib);
}
catch (Exception ex)
{
tslInfo.Text = ex.Message;
}
}
