/// <summary>
/// Begins image saving to database.
/// Created by Brendan Brading, Fred Chappuis, and Phillip Kempton.
/// </summary>
/// <param name="sender">The event sender</param>
/// <param name="e">The event arguments</param>
private void OnClick_SaveImage(object sender, RoutedEventArgs e)
{
ApiHandler.ApiHandler handler = new ApiHandler.ApiHandler();
// Call DB to get the points.
List <KeyValuePair <string, PostGisPoint> > points = handler.GetBounds();
PostGisPoint topLeft = new PostGisPoint();
PostGisPoint botRight = new PostGisPoint();
foreach ((string key, PostGisPoint value) in points)
{
switch (key)
{
case "top_left":
topLeft = value;
break;
case "bottom_right":
botRight = value;
break;
default:
throw new Exception("Too Many Bounds");
}
}
// Get the width and height of the map in kilometers using the haversine conversion
double widthInKm = HaversineConversion.HaversineDistance(
topLeft,
new PostGisPoint {
X = botRight.Longitude, Y = topLeft.Latitude
},
HaversineConversion.DistanceUnit.Kilometers);
double heightInKm = HaversineConversion.HaversineDistance(
topLeft,
new PostGisPoint {
X = topLeft.Longitude, Y = botRight.Latitude
},
HaversineConversion.DistanceUnit.Kilometers);
int width = (int)Math.Ceiling(5000 * widthInKm);
int height = (int)Math.Ceiling(5000 * heightInKm);
// Create a new bitmap with the required size
Bitmap bitmap = new Bitmap(
width,
height,
PixelFormat.Format32bppArgb);
// Fill the bitmap background with the specified colour
using (Graphics bitmapGraphics = Graphics.FromImage(bitmap))
{
bitmapGraphics.FillRegion(
Brushes.White,
new Region(new Rectangle(0, 0, bitmap.Width, bitmap.Height)));
}
// Load the generated SVG
SvgDocument svgDocument = SvgDocument.Open(FileIO.GetOutputDirectory() + @"\output.svg");
// Draw the contents of the SVG onto the bitmap
svgDocument.Draw(bitmap);
// Save the bitmap as a PNG
bitmap.Save(FileIO.GetOutputDirectory() + @"\output.png", ImageFormat.Png);
// Push image to API
handler.InsertPng(
0.0f,
@"\output.png",
"osmMap.png",
new PostGisPoint {
X = (((botRight.Longitude - topLeft.Longitude) / 2) + topLeft.Longitude), Y = (((topLeft.Latitude - botRight.Latitude) / 2) + botRight.Latitude)
},
widthInKm,
heightInKm);
}
/// <summary>
/// Generates an SVG image file using the specified data-points, boundaries and options.
/// Saves the file to the specified location.
/// </summary>
/// <param name="outputFile">The location to save the SVG file</param>
/// <param name="dataPoints">The list of data-points to include</param>
/// <param name="topLeftPoint">The top-left bound of the data</param>
/// <param name="bottomRightPoint">The bottom-right bound of the data</param>
/// <param name="listener">The callback for the UI</param>
public static async void Generate(
string outputFile,
List <PostGisData> dataPoints,
PostGisPoint topLeftPoint,
PostGisPoint bottomRightPoint,
ISvgGenerator listener)
{
// Run on background thread
await Task.Run(() =>
{
// Normalize bounds to start at (0,0) and move toward positive (bottom-right) values
bottomRightPoint.X -= topLeftPoint.X;
bottomRightPoint.Y -= topLeftPoint.Y;
topLeftPoint.X -= topLeftPoint.X;
topLeftPoint.Y -= topLeftPoint.Y;
// Initialize stream writer
using StreamWriter sw = new StreamWriter(outputFile);
// Write the header of the SVG
sw.Write("<svg viewBox=\"");
sw.Write(topLeftPoint.X + " " + topLeftPoint.Y + " " + bottomRightPoint.X + " " + bottomRightPoint.Y);
sw.WriteLine("\" xmlns=\"http://www.w3.org/2000/svg\">");
// Iterate through the polygons which fit the specified options
foreach (PostGisData dataPoint in
from optionsKey in SvgTabControl.Options.Keys
let allowedValues = SvgTabControl.Options[optionsKey]
from dataPoint in
from dataPoint in dataPoints
where dataPoint.Type == PostGisData.DataType.Polygon &&
dataPoint.Data.ContainsKey(optionsKey) &&
allowedValues.Contains(dataPoint.Data[optionsKey])
select dataPoint
select dataPoint)
{
// Write the polygon path
sw.Write("<path d=\"");
sw.Write(dataPoint.Data["way"]);
sw.Write("\" fill=\"");
sw.Write(dataPoint.GetColour());
sw.WriteLine("\" stroke=\"none\"/>");
}
// Iterate through the rest of the data-points which fit the specified options
foreach (PostGisData dataPoint in
from optionsKey in SvgTabControl.Options.Keys
let allowedValues = SvgTabControl.Options[optionsKey]
from dataPoint in
from dataPoint in dataPoints
where dataPoint.Type != PostGisData.DataType.Polygon &&
dataPoint.Data.ContainsKey(optionsKey) &&
allowedValues.Contains(dataPoint.Data[optionsKey])
select dataPoint
select dataPoint)
{
// Write the road/line/point path
sw.Write("<path d=\"");
sw.Write(dataPoint.Data["way"]);
sw.Write("\" stroke=\"");
sw.Write(dataPoint.GetColour());
sw.WriteLine("\" stroke-width=\"3\" fill=\"none\"/>");
}
// Close the SVG tag
sw.WriteLine("</svg>");
}).ContinueWith(task =>
{
// Launch the callback
listener.OnGenerationFinished(outputFile);
});
}
