void bw_DoWork(object sender, DoWorkEventArgs e)
{
try
{
double[,] noise = null;
//depending on the style selected, create some default noise values
if (selectedNoiseStyle.Equals(NoiseStyles.Planar))
{
noise = NoiseFactory.GeneratePlanar(module, imageWidth, imageHeight, -1, 1, -1, 1, true, true, 0);
}
if (selectedNoiseStyle.Equals(NoiseStyles.Cylindrical))
{
noise = NoiseFactory.GenerateCylindrical(module, imageWidth, imageHeight, -1, 180, -1, 1, true, 0);
}
else
{
noise = NoiseFactory.GenerateSpherical(module, imageWidth, imageHeight, worldSouth, worldNorth, worldWest, worldEast, true, 0);
}
// Generate the image from the nosie values
System.Drawing.Rectangle areaToPaint = new System.Drawing.Rectangle(0, 0, imageWidth, imageHeight);
Bitmap bmp = new Bitmap(imageWidth, imageHeight);
BitmapData bmData = bmp.LockBits(areaToPaint, ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
//Generate a second image to overlay "Hillshading" for the world style
Bitmap hillshadeBmp = new Bitmap(imageWidth, imageHeight);
BitmapData hsbmData = hillshadeBmp.LockBits(areaToPaint, ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
int stride = imageWidth * 4;
unsafe
{
byte *ptr = (byte *)bmData.Scan0.ToPointer();
byte *hsPtr = (byte *)hsbmData.Scan0.ToPointer();
for (int y = areaToPaint.Top; y < areaToPaint.Height; y++)
{
for (int x = areaToPaint.Left; x < areaToPaint.Width; x++)
{
double heightValue = noise[x, y];
System.Drawing.Color finalColor = System.Drawing.Color.Black;
if (selectedColorStyle.Equals(ColourStyles.Greyscale))
{
finalColor = GetGradientColor(System.Drawing.Color.Black, System.Drawing.Color.White, (float)heightValue);
}
else if (selectedColorStyle.Equals(ColourStyles.RedBlue))
{
finalColor = GetGradientColor(System.Drawing.Color.Blue, System.Drawing.Color.Red, (float)heightValue);
}
else
{
// "World" style
if (heightValue <= 0.5)
{
finalColor = System.Drawing.Color.PowderBlue;
}
else if (heightValue >= 0.9)
{
finalColor = GetGradientColor(System.Drawing.Color.LightGray, System.Drawing.Color.Snow, (float)heightValue);
}
else
{
finalColor = GetGradientColor(System.Drawing.Color.LightGreen, System.Drawing.Color.ForestGreen, (float)heightValue);
}
System.Drawing.Color hillshading = Hillshade(noise, imageWidth, imageHeight, x, y, 10, 45, 315, 1);
hsPtr[(x * 4) + y * stride] = ((Color)hillshading).B;
hsPtr[(x * 4) + y * stride + 1] = ((Color)hillshading).G;
hsPtr[(x * 4) + y * stride + 2] = ((Color)hillshading).R;
byte trans = 255;
if (heightValue > 0.5)
{
trans = (byte)(((Color)hillshading).A * 0.3); // over land set transparency to 30%
}
else
{
trans = (byte)(((Color)hillshading).A * 0.1); // over water transparency to 10%
}
hsPtr[(x * 4) + y * stride + 3] = trans;
}
ptr[(x * 4) + y * stride] = finalColor.B;
ptr[(x * 4) + y * stride + 1] = finalColor.G;
ptr[(x * 4) + y * stride + 2] = finalColor.R;
ptr[(x * 4) + y * stride + 3] = finalColor.A;
}
}
}
bmp.UnlockBits(bmData);
hillshadeBmp.UnlockBits(hsbmData);
if (selectedColorStyle.Equals(ColourStyles.World))
{
Bitmap mergedResult = new Bitmap(imageWidth, imageHeight);
Graphics canvas = Graphics.FromImage(mergedResult);
canvas.InterpolationMode = InterpolationMode.HighQualityBicubic;
canvas.DrawImage(bmp, new Rectangle(0, 0, bmp.Width, bmp.Height), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);
canvas.DrawImage(hillshadeBmp, new Rectangle(0, 0, hillshadeBmp.Width, hillshadeBmp.Height), new Rectangle(0, 0, hillshadeBmp.Width, hillshadeBmp.Height), GraphicsUnit.Pixel);
canvas.Save();
previewBmp = mergedResult;
}
else
{
previewBmp = bmp;
}
}
catch (Exception ex)
{
MessageBox.Show("An error has occured while generating the image preview. " + ex.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Error);
}
}
