C# Bitmap.ToPixelData方法代码示例

    public ContourAnimationInfo getContourAnimations(ContourQuery contourQuery)
    {
        List<List<TrendingDataLocation>> frames = GetFramesFromHistorian(contourQuery);
        PiecewiseLinearFunction colorScale = GetColorScale(contourQuery);
        Func<double, double> colorFunc = colorScale;

        // The actual startDate is the timestamp of the
        // first frame after contourQuery.GetStartDate()
        DateTime startDate = contourQuery.GetStartDate();
        int stepSize = contourQuery.StepSize;
        int startTimeOffset = (int)Math.Ceiling((startDate - startDate.Date).TotalMinutes / stepSize);
        startDate = startDate.Date.AddMinutes(startTimeOffset * stepSize);

        double minLat = frames.Min(frame => frame.Min(location => location.Latitude)) - GetLatFromMiles(50.0D);
        double maxLat = frames.Min(frame => frame.Max(location => location.Latitude)) + GetLatFromMiles(50.0D);
        double minLng = frames.Min(frame => frame.Min(location => location.Longitude)) - GetLngFromMiles(50.0D, 0.0D);
        double maxLng = frames.Min(frame => frame.Max(location => location.Longitude)) + GetLngFromMiles(50.0D, 0.0D);

        GeoCoordinate topLeft = new GeoCoordinate(maxLat, minLng);
        GeoCoordinate bottomRight = new GeoCoordinate(minLat, maxLng);
        GSF.Drawing.Point topLeftPoint = s_crs.Translate(topLeft, contourQuery.Resolution);
        GSF.Drawing.Point bottomRightPoint = s_crs.Translate(bottomRight, contourQuery.Resolution);

        topLeftPoint = new GSF.Drawing.Point(Math.Floor(topLeftPoint.X), Math.Floor(topLeftPoint.Y));
        bottomRightPoint = new GSF.Drawing.Point(Math.Ceiling(bottomRightPoint.X), Math.Ceiling(bottomRightPoint.Y));
        topLeft = s_crs.Translate(topLeftPoint, contourQuery.Resolution);
        bottomRight = s_crs.Translate(bottomRightPoint, contourQuery.Resolution);

        int width = (int)(bottomRightPoint.X - topLeftPoint.X + 1);
        int height = (int)(bottomRightPoint.Y - topLeftPoint.Y + 1);

        int animationID;
        string timeZoneID = null;

        using (AdoDataConnection connection = new AdoDataConnection(connectionstring, typeof(SqlConnection), typeof(SqlDataAdapter)))
        {
            connection.ExecuteNonQuery("INSERT INTO ContourAnimation(ColorScaleName, StartTime, EndTime, StepSize) VALUES({0}, {1}, {2}, {3})", contourQuery.ColorScaleName, contourQuery.GetStartDate(), contourQuery.GetEndDate(), contourQuery.StepSize);
            animationID = connection.ExecuteScalar<int>("SELECT @@IDENTITY");

            if (contourQuery.IncludeWeather)
                timeZoneID = connection.ExecuteScalar<string>("SELECT Value FROM Setting WHERE Name = 'XDATimeZone'");
        }

        GSF.Threading.CancellationToken cancellationToken = new GSF.Threading.CancellationToken();
        s_cancellationTokens[animationID] = cancellationToken;

        ProgressCounter progressCounter = new ProgressCounter(frames.Count);
        s_progressCounters[animationID] = progressCounter;

        Action<int> createFrame = i =>
        {
            List<TrendingDataLocation> frame = frames[i];
            IDWFunc idwFunction = GetIDWFunction(contourQuery, frame);
            uint[] pixelData;

            if (contourQuery.IncludeWeather)
            {
                TimeZoneInfo tzInfo = !string.IsNullOrEmpty(timeZoneID)
                    ? TimeZoneInfo.FindSystemTimeZoneById(timeZoneID)
                    : TimeZoneInfo.Local;

                // Weather data is only available in 5-minute increments
                DateTime frameTime = TimeZoneInfo.ConvertTimeToUtc(startDate.AddMinutes(stepSize * i), tzInfo);
                double minutes = (frameTime - frameTime.Date).TotalMinutes;
                int weatherMinutes = (int)Math.Ceiling(minutes / 5) * 5;

                NameValueCollection queryString = HttpUtility.ParseQueryString(string.Empty);
                queryString["service"] = "WMS";
                queryString["request"] = "GetMap";
                queryString["layers"] = "nexrad-n0r-wmst";
                queryString["format"] = "image/png";
                queryString["transparent"] = "true";
                queryString["version"] = "1.1.1";
                queryString["time"] = frameTime.Date.AddMinutes(weatherMinutes).ToString("o");
                queryString["height"] = height.ToString();
                queryString["width"] = width.ToString();
                queryString["srs"] = "EPSG:3857";

                GSF.Drawing.Point topLeftProjected = s_crs.Projection.Project(topLeft);
                GSF.Drawing.Point bottomRightProjected = s_crs.Projection.Project(bottomRight);
                queryString["bbox"] = string.Join(",", topLeftProjected.X, bottomRightProjected.Y, bottomRightProjected.X, topLeftProjected.Y);

                string weatherURL = "http://mesonet.agron.iastate.edu/cgi-bin/wms/nexrad/n0r-t.cgi?" + queryString.ToString();

                using (WebClient client = new WebClient())
                using (MemoryStream stream = new MemoryStream(client.DownloadData(weatherURL)))
                using (Bitmap bitmap = new Bitmap(stream))
                {
                    pixelData = bitmap.ToPixelData();
                }
            }
            else
            {
                pixelData = new uint[width * height];
            }

            if (cancellationToken.IsCancelled)
                return;

            for (int x = 0; x < width; x++)
//.........这里部分代码省略.........