Updated on 15/07/2009 to Silverlight 3 RTW
Inspired by old school MS DOS demos and this Flash Alchemy experiment.
Found out that someone already ported some code from the Alchemy experiment to C#.
So after some tweaking and some help of my colleague Frederik it’s up and running in Silverlight 3 beta.
I’m using two threads to speed up the plasma calculation when moving the dots, since everybody has a duo,triple,quad,octa … core CPU these days,
One thread does even lines and the other odd lines (interlacing).
public static void GeneratePlasmaEvenLines()
{
int index = 0;
for (var x = 0; x < width; x +=2)
{
for (var y = 0; y < height ; y+=1)
{
uint color = CalculatePixel(x, y);
plasma[index++] = color % 255;
}
index += width;
}
}
public static void GeneratePlasmaOddLines()
{
int index = width;
for (var x = 1; x < width; x+=2)
{
for (var y = 0; y < height; y+=1)
{
uint color = CalculatePixel(x, y);
plasma[index++] = color % 255;
}
index += height;
}
}
private static uint CalculatePixel(int x, int y)
{
int w = (int) param6;
int h = (int)param5;
uint color = (uint)
(
128.0 + (param3 * Math.Sin(x / param1))
+ 128.0 + (param4 * Math.Sin(y / param2))
+ 128.0 + ((param5/4) * Math.Sin(Math.Sqrt((double)((x - w)* (x - w) + (y - h ) * (y - h))) / 9.0))
+ 128.0 + ((param6/4)* Math.Sin(Math.Sqrt((double)(x * x + y * y)) / 9.0))
) / 4;
// Add shift position to sync the color
color += LastShift;
return color;
}
Placing the pixels on the canvas with the our brand new bitmap api
private void BuildBitmap(uint[] data)
{
uint colorValue=0;
for (int x = 0; x < imageWidth; x++)
{
for (int y = 0; y < imageHeight; y++)
{
// set the pixel value
int palletIndex = (int)data[y * imageWidth + x];
colorValue = GeneratePlasma.palette[palletIndex];
writeableBitmap.Pixels[y * imageWidth + x] = (int)colorValue;
}
}
writeableBitmap.Invalidate();
btImage.Source = writeableBitmap;
GC.Collect();
}
To view the full code download the project below.
Silverlight 3 is required
