/// <summary>
/// Here in the DrawCore we cluster the features
/// </summary>
protected override void DrawCore(IEnumerable <Feature> features, GeoCanvas canvas, Collection <SimpleCandidate> labelsInThisLayer, Collection <SimpleCandidate> labelsInAllLayers)
{
// We get the scale to determine the grid. This scale property should really be on the Canvas!
double scale = ExtentHelper.GetScale(canvas.CurrentWorldExtent, canvas.Width, canvas.MapUnit);
// Setup our grid for clustering the points. This is where we specify our cell size in pixels
MapSuiteTileMatrix mapSuiteTileMatrix = new MapSuiteTileMatrix(scale, cellSize, cellSize, canvas.MapUnit);
// Pass in the current extent to get our grid cells. All points in these cells will be consolidated
IEnumerable <TileMatrixCell> tileMatricCells = mapSuiteTileMatrix.GetContainedCells(canvas.CurrentWorldExtent);
// Create an unused features list, as we add them to clusters we will remove them from here
// This is just for speed so we don't re-test lots of already associated features
Dictionary <string, string> unusedFeatures = new Dictionary <string, string>();
foreach (Feature feature in features)
{
if (feature.GetWellKnownType() != WellKnownType.Point && feature.GetWellKnownType() != WellKnownType.Multipoint)
{
continue;
}
unusedFeatures.Add(feature.Id, feature.Id);
}
// Loop through each cell and find the features that fit inside of it
foreach (TileMatrixCell cell in tileMatricCells)
{
int featureCount = 0;
MultipointShape tempMultiPointShape = new MultipointShape();
foreach (Feature feature in features)
{
// Make sure the feature has not been used in another cluster
if (unusedFeatures.ContainsKey(feature.Id))
{
// Check if the cell contains the feature
if (cell.BoundingBox.Contains(feature.GetBoundingBox()))
{
featureCount++;
unusedFeatures.Remove(feature.Id);
if (feature.GetWellKnownType() == WellKnownType.Multipoint)
{
MultipointShape multipointShape = feature.GetShape() as MultipointShape;
foreach (var item in multipointShape.Points)
{
tempMultiPointShape.Points.Add(item);
}
}
else
{
tempMultiPointShape.Points.Add(feature.GetShape() as PointShape);
}
}
}
}
if (featureCount > 0)
{
// Add the feature count to the new feature we created. The feature will be placed
// at the center of gravity of all the clustered features of the cell we created.
Dictionary <string, string> featureValues = new Dictionary <string, string>();
featureValues.Add("FeatureCount", featureCount.ToString(CultureInfo.InvariantCulture));
bool isMatch = false;
for (int i = 0; i < classBreakPoints.Count - 1; i++)
{
var startItem = classBreakPoints.ElementAt(i);
var endItem = classBreakPoints.ElementAt(i + 1);
if (featureCount >= startItem.Key && featureCount < endItem.Key)
{
// Draw the point shape
startItem.Value.Draw(new Feature[] { new Feature(tempMultiPointShape.GetCenterPoint(), featureValues) }, canvas, labelsInThisLayer, labelsInAllLayers);
isMatch = true;
break;
}
}
if (!isMatch && featureCount >= classBreakPoints.LastOrDefault().Key)
{
classBreakPoints.LastOrDefault().Value.Draw(new Feature[] { new Feature(tempMultiPointShape.GetCenterPoint(), featureValues) }, canvas, labelsInThisLayer, labelsInAllLayers);
}
if (featureCount != 1)
{
// Draw the text style to show how many feaures are consolidated in the cluster
textSytle.Draw(new Feature[] { new Feature(tempMultiPointShape.GetCenterPoint(), featureValues) }, canvas, labelsInThisLayer, labelsInAllLayers);
}
}
}
}
protected override void DrawCore(IEnumerable <Feature> features, GeoCanvas canvas, Collection <SimpleCandidate> labelsInThisLayer, Collection <SimpleCandidate> labelsInAllLayers)
{
double scale = ExtentHelper.GetScale(canvas.CurrentWorldExtent, canvas.Width, canvas.MapUnit);
MapSuiteTileMatrix mapSuiteTileMatrix = new MapSuiteTileMatrix(scale, cellSize, cellSize, canvas.MapUnit);
IEnumerable <TileMatrixCell> tileMatricCells = mapSuiteTileMatrix.GetContainedCells(canvas.CurrentWorldExtent);
Dictionary <string, string> unusedFeatures = new Dictionary <string, string>();
foreach (Feature feature in features)
{
if (feature.GetWellKnownType() != WellKnownType.Point && feature.GetWellKnownType() != WellKnownType.Multipoint)
{
continue;
}
unusedFeatures.Add(feature.Id, feature.Id);
}
foreach (TileMatrixCell cell in tileMatricCells)
{
int featureCount = 0;
MultipointShape tempMultiPointShape = new MultipointShape();
foreach (Feature feature in features)
{
// Make sure the feature has not been used in another cluster
if (unusedFeatures.ContainsKey(feature.Id))
{
// Check if the cell contains the feature
if (cell.BoundingBox.Contains(feature.GetBoundingBox()))
{
featureCount++;
unusedFeatures.Remove(feature.Id);
if (feature.GetWellKnownType() == WellKnownType.Multipoint)
{
MultipointShape multipointShape = feature.GetShape() as MultipointShape;
foreach (var item in multipointShape.Points)
{
tempMultiPointShape.Points.Add(item);
}
}
else
{
tempMultiPointShape.Points.Add(feature.GetShape() as PointShape);
}
}
}
}
if (featureCount > 0)
{
// Add the feature count to the new feature we created. The feature will be placed
// at the center of gravity of all the clustered features of the cell we created.
Dictionary <string, string> featureValues = new Dictionary <string, string>();
featureValues.Add("FeatureCount", featureCount.ToString(CultureInfo.InvariantCulture));
bool isMatch = false;
for (int i = 0; i < classBreakPoint.Count - 1; i++)
{
var startItem = classBreakPoint.ElementAt(i);
var endItem = classBreakPoint.ElementAt(i + 1);
if (featureCount >= startItem.Key && featureCount < endItem.Key)
{
//Draw the point shape
startItem.Value.Draw(new[] { new Feature(tempMultiPointShape.GetCenterPoint(), featureValues) }, canvas, labelsInThisLayer, labelsInAllLayers);
isMatch = true;
break;
}
}
if (!isMatch && featureCount >= classBreakPoint.LastOrDefault().Key)
{
classBreakPoint.LastOrDefault().Value.Draw(new[] { new Feature(tempMultiPointShape.GetCenterPoint(), featureValues) }, canvas, labelsInThisLayer, labelsInAllLayers);
}
if (featureCount != 1)
{
// Draw the text style to show how many feaures are consolidated in the cluster
textSytle.Draw(new[] { new Feature(tempMultiPointShape.GetCenterPoint(), featureValues) }, canvas, labelsInThisLayer, labelsInAllLayers);
}
}
}
}