private static RectangleF RoundToPixel(Geometries.Point min, Geometries.Point max)
{
// To get seamless aligning you need to round the
// corner coordinates to pixel. The new width and
// height will be a result of that.
var x = Math.Round(min.X);
var y = Math.Round(min.Y);
var width = Math.Round(max.X) - Math.Round(min.X);
var height = Math.Round(max.Y) - Math.Round(min.Y);
return(new RectangleF((float)x, (float)y, (float)width, (float)height));
}
public static RectangleF ConvertPointBoundingBox(SymbolStyle symbolStyle, BoundingBox boundingBox, IViewport viewport)
{
var screenMin = viewport.WorldToScreen(boundingBox.Min);
var screenMax = viewport.WorldToScreen(boundingBox.Max);
//boundingBox.Offset = symbolStyle.SymbolOffset;
//var newMin = boundingBox.Min;
//var newMax = boundingBox.Max;
if (symbolStyle.SymbolOffset != null)
{
screenMin = new Geometries.Point(
screenMin.X - symbolStyle.SymbolOffset.X,
screenMin.Y - symbolStyle.SymbolOffset.Y);
screenMax = new Geometries.Point(
screenMax.X - symbolStyle.SymbolOffset.X,
screenMax.Y - symbolStyle.SymbolOffset.Y);
var w = viewport.ScreenToWorld(screenMin);
boundingBox.Offset(new Geometries.Point(w.X - boundingBox.MinX, w.Y - boundingBox.MinY));
screenMin = viewport.WorldToScreen(boundingBox.Min);
screenMax = viewport.WorldToScreen(boundingBox.Max);
}
var min = new Geometries.Point(screenMin.X - (32 / 2), screenMax.Y - (32 / 2)); //!!!
var max = new Geometries.Point((min.X + 32), (min.Y + 32)); //!!!
var frame = RoundToPixel(min, max);
//if(symbolStyle.SymbolOffset != null)
// frame.Offset ((float)symbolStyle.SymbolOffset.X, (float)symbolStyle.SymbolOffset.Y);
return(frame);
}
public static Canvas Render(IViewport viewport, LabelLayer layer)
{
// todo: Move stack functionality to Mapsui core.
// step 1) Split RenderStackedLabelLayer into a method
// GetFeaturesInViewStacked en a RenderStackedLabel
// which can later be replace by normal label rendering.
// The method GetFeaturesInViewStacked
// returns a style with an offset determined by the stackoffset
// and a position determined by CenterX en Cluster.Box.Bottom.
// step 2) Move GetFeaturesInViewStacked to a GetFeaturesInView
// method of a new StackedLabelLayed.
var canvas = new Canvas { Opacity = layer.Opacity };
// todo: take into account the priority
var features = layer.GetFeaturesInView(viewport.Extent, viewport.Resolution).ToArray();
var margin = viewport.Resolution * 50;
const int symbolSize = 32; // todo: determine margin by symbol size
const int boxMargin = symbolSize / 2;
var clusters = new List<Cluster>();
//todo: repeat until there are no more merges
ClusterFeatures(clusters, features, margin, layer.Style, viewport.Resolution);
const int textHeight = 18;
foreach (var cluster in clusters)
{
var stackOffsetY = double.NaN;
var orderedFeatures = cluster.Features.OrderBy(f => f.Geometry.GetBoundingBox().GetCentroid().Y);
if (cluster.Features.Count > 1) canvas.Children.Add(RenderBox(cluster.Box, viewport));
foreach (var feature in orderedFeatures)
{
if (double.IsNaN(stackOffsetY)) // first time
stackOffsetY = textHeight * 0.5 + boxMargin;
else
stackOffsetY += textHeight; //todo: get size from text (or just pass stack nr)
LabelStyle style;
if (layer.Style is IThemeStyle)
{
style = (LabelStyle)((IThemeStyle)layer.Style).GetStyle(feature);
}
else
{
style = (LabelStyle)layer.Style;
}
var labelStyle = new LabelStyle(style)
{
Text = layer.GetLabelText(feature) //we only use the layer for the text, this should be returned by style
};
labelStyle.Offset.Y += stackOffsetY;
// since the box can be rotated, find the minimal Y value of all 4 corners
var rotatedBox = cluster.Box.Rotate(-viewport.Rotation);
var minY = rotatedBox.Vertices.Select(v => v.Y).Min();
var position = new Geometries.Point(cluster.Box.GetCentroid().X, minY);
var labelText = labelStyle.GetLabelText(feature);
canvas.Children.Add(SingleLabelRenderer.RenderLabel(position, labelStyle, viewport, labelText));
}
}
return canvas;
}
public static Canvas Render(IViewport viewport, LabelLayer layer)
{
// todo: Move stack functionality to Mapsui core.
// step 1) Split RenderStackedLabelLayer into a method
// GetFeaturesInViewStacked en a RenderStackedLabel
// which can later be replace by normal label rendering.
// The method GetFeaturesInViewStacked
// returns a style with an offset determined by the stackoffset
// and a position determined by CenterX en Cluster.Box.Bottom.
// step 2) Move GetFeaturesInViewStacked to a GetFeaturesInView
// method of a new StackedLabelLayed.
var canvas = new Canvas {
Opacity = layer.Opacity
};
// todo: take into account the priority
var features = layer.GetFeaturesInView(viewport.Extent, viewport.Resolution).ToArray();
var margin = viewport.Resolution * 50;
const int symbolSize = 32; // todo: determine margin by symbol size
const int boxMargin = symbolSize / 2;
var clusters = new List <Cluster>();
//todo: repeat until there are no more merges
ClusterFeatures(clusters, features, margin, layer.Style, viewport.Resolution);
const int textHeight = 18;
foreach (var cluster in clusters)
{
var stackOffsetY = double.NaN;
var orderedFeatures = cluster.Features.OrderBy(f => f.Geometry.GetBoundingBox().GetCentroid().Y);
if (cluster.Features.Count > 1)
{
canvas.Children.Add(RenderBox(cluster.Box, viewport));
}
foreach (var feature in orderedFeatures)
{
if (double.IsNaN(stackOffsetY)) // first time
{
stackOffsetY = textHeight * 0.5 + boxMargin;
}
else
{
stackOffsetY += textHeight; //todo: get size from text (or just pass stack nr)
}
LabelStyle style;
if (layer.Style is IThemeStyle)
{
style = (LabelStyle)((IThemeStyle)layer.Style).GetStyle(feature);
}
else
{
style = (LabelStyle)layer.Style;
}
var labelStyle = new LabelStyle(style)
{
Text = layer.GetLabelText(feature) //we only use the layer for the text, this should be returned by style
};
labelStyle.Offset.Y += stackOffsetY;
// since the box can be rotated, find the minimal Y value of all 4 corners
var rotatedBox = cluster.Box.Rotate(-viewport.Rotation);
var minY = rotatedBox.Vertices.Select(v => v.Y).Min();
var position = new Geometries.Point(cluster.Box.GetCentroid().X, minY);
var labelText = labelStyle.GetLabelText(feature);
canvas.Children.Add(SingleLabelRenderer.RenderLabel(position, labelStyle, viewport, labelText));
}
}
return(canvas);
}