protected override void OnSourceServerChanged(object sender, ValueChangedEventArgs<SourceTileServer> e)
{
base.OnSourceServerChanged(sender, e);
var mapTileProvider = TileProvider as MapTileProvider;
if (mapTileProvider == null)
throw new ArgumentException("MercatorShaderMap's TileProvider should be only MapTileProvider.");
mercatorTransform = new MercatorTransform(mapTileProvider.MaxShaderLatitude);
}
protected override void OnSourceServerChanged(object sender, ValueChangedEventArgs <SourceTileServer> e)
{
base.OnSourceServerChanged(sender, e);
var mapTileProvider = TileProvider as MapTileProvider;
if (mapTileProvider == null)
{
throw new ArgumentException("MercatorShaderMap's TileProvider should be only MapTileProvider.");
}
mercatorTransform = new MercatorTransform(mapTileProvider.MaxShaderLatitude);
}
private EnumerableDataSource <DataPoint> CreateDataSource(IEnumerable <DataPoint> data)
{
EnumerableDataSource <DataPoint> ds = new EnumerableDataSource <DataPoint>(data);
MercatorTransform transform = new MercatorTransform();
ds.SetXMapping(p => p.X);
ds.SetYMapping(p => transform.DataToViewport(new Point(0, p.Y)).Y);
ds.AddMapping(CirclePointMarker.FillProperty, dp =>
{
double alpha = (dp.Data - currentRange.Min) / (currentRange.Max - currentRange.Min);
Debug.Assert(0 <= alpha && alpha <= 1);
const double hueWidth = 100;
double hue = hueWidth * (alpha - 0.5) + hueSlider.Value;
if (hue > 360)
{
hue -= 360;
}
else if (hue < 0)
{
hue += 360;
}
Debug.Assert(0 <= hue && hue <= 360);
Color mainColor = new HsbColor(hue, 1, 0 + 1 * alpha, 0.3 + 0.7 * alpha).ToArgbColor();
const int colorCount = 5;
GradientStopCollection colors = new GradientStopCollection(colorCount);
double step = 1.0 / (colorCount - 1);
for (int i = 0; i < colorCount; i++)
{
Color color = mainColor;
double x = attSlider.Value * step * i;
color.A = (byte)(255 * Math.Exp(-x * x));
colors.Add(new GradientStop(color, step * i));
}
return(new RadialGradientBrush(colors));
});
return(ds);
}
//-------------------------------------------------------------------------
public static BitmapSource ApplyMercatorTransform(this BitmapSource src, double northDeg, double southDeg)
{
var tgt = new WriteableBitmap(src);
int ySize = src.PixelHeight;
int xSize = src.PixelWidth;
byte[] pixels = new byte[ySize * xSize * 4];
byte[] srcPixels = new byte[ySize * xSize * 4];
src.CopyPixels(srcPixels, 4 * xSize, 0);
var tForm = new MercatorTransform();
var vpNorth = tForm.DataToViewport(new System.Windows.Point(0.0, northDeg));
var vpSouth = tForm.DataToViewport(new System.Windows.Point(0.0, southDeg));
Parallel.For(0, ySize, (y) =>
{
// calculate target pixel latitude
var tgtLat = northDeg - (y * (northDeg - southDeg) / ySize);
// transform the target pixel lat to a source latitude via Mercator transform
var vp = tForm.DataToViewport(new System.Windows.Point(0.0, tgtLat));
// translate src viewport coord to a y value
int srcY = (int)Math.Floor(ySize * (Math.Abs(vp.Y - vpNorth.Y) / Math.Abs(vpNorth.Y - vpSouth.Y)));
for (int x = 0; x < xSize; ++x)
{
int tgtOffset = (y * src.PixelWidth + x) * 4;
int srcOffset = (srcY * src.PixelWidth + x) * 4;
pixels[tgtOffset] = srcPixels[srcOffset];
pixels[tgtOffset + 1] = srcPixels[srcOffset + 1];
pixels[tgtOffset + 2] = srcPixels[srcOffset + 2];
pixels[tgtOffset + 3] = srcPixels[srcOffset + 3];
}
});
WriteableBitmap bmp = new WriteableBitmap(xSize, ySize, 96, 96, System.Windows.Media.PixelFormats.Bgra32, BitmapPalettes.WebPaletteTransparent);
bmp.WritePixels(new System.Windows.Int32Rect(0, 0, xSize, ySize), pixels, 4 * xSize, 0);
bmp.Freeze();
return(bmp);
}
protected override void OnNetworkServerChanged(object sender, EventArgs e)
{
base.OnNetworkServerChanged(sender, e);
mercatorTransform = new MercatorTransform(TileProvider.MaxLatitude);
}
protected override void OnNetworkServerChanged(object sender, EventArgs e)
{
base.OnNetworkServerChanged(sender, e);
mercatorTransform = new MercatorTransform(TileProvider.MaxLatitude);
}
