public static CATextLayer RenderLabel(Mapsui.Geometries.Point point, LabelStyle style, IFeature feature, IViewport viewport, string text)
{
// Offset stackOffset,
Mapsui.Geometries.Point p = viewport.WorldToScreen(point);
//var pointF = new xPointF((float)p.X, (float)p.Y);
var label = new CATextLayer ();
var aString = new Foundation.NSAttributedString (text,
new CoreText.CTStringAttributes(){
Font = new CoreText.CTFont("ArialMT", 10)
});
var frame = new CGRect(new CoreGraphics.CGPoint((int)p.X, (int)p.Y), GetSizeForText(0, aString));
//label.Frame = frame;
//frame.Width = (float)(p2.X - p1.X);// + margin);
//frame.Height = (float)(p1.Y - p2.Y);
label.FontSize = 10;
label.ForegroundColor = new CoreGraphics.CGColor (0, 0, 255, 150);
label.BackgroundColor = new CoreGraphics.CGColor (255, 0, 2, 150);
label.String = text;
label.Frame = frame;
Console.WriteLine ("Pos " + label.Frame.X + ":" + label.Frame.Y + " w " + label.Frame.Width + " h " + label.Frame.Height);
// = MonoTouch.UIKit.UIScreen.MainScreen.Scale;
// label.ContentsScale = scale;
return label;
}
private static SKBitmap CreateLabelAsBitmap(LabelStyle style, string text)
{
using (var paint = CreatePaint(style))
{
return CreateLabelAsBitmap(style, text, paint);
}
}
public static void RenderTexture(TextureInfo textureInfo, float x, float y, float orientation = 0,
float offsetX = 0, float offsetY = 0,
LabelStyle.HorizontalAlignmentEnum horizontalAlignment = LabelStyle.HorizontalAlignmentEnum.Center,
LabelStyle.VerticalAlignmentEnum verticalAlignment = LabelStyle.VerticalAlignmentEnum.Center,
float opacity = 1f,
float scale = 1f)
{
GL.Enable(All.Texture2D);
GL.BindTexture(All.Texture2D, textureInfo.TextureId);
GL.PushMatrix();
GL.Translate(x, y, 0f);
GL.Rotate(orientation, 0, 0, 1);
GL.Scale (scale, scale, 1);
x = offsetX + DetermineHorizontalAlignmentCorrection(horizontalAlignment, textureInfo.Width);
y = -offsetY + DetermineVerticalAlignmentCorrection(verticalAlignment, textureInfo.Height);
var halfWidth = textureInfo.Width / 2;
var halfHeight = textureInfo.Height / 2;
var vertextArray = new[]
{
x - halfWidth, y - halfHeight,
x + halfWidth, y - halfHeight,
x + halfWidth, y + halfHeight,
x - halfWidth, y + halfHeight
};
RenderTextureWithoutBinding(textureInfo.TextureId, vertextArray, opacity);
GL.PopMatrix();
GL.BindTexture(All.Texture2D, 0);
GL.Disable(All.Texture2D);
}
public static MemoryStream Create(LabelStyle style, string text)
{
UIImage image = null;
var handle = new ManualResetEvent(false);
var view = new UIView();
view.InvokeOnMainThread(() =>
{
view.Opaque = false;
view.BackgroundColor = UIColor.Clear;
var bitmapSize = UIStringDrawing.StringSize(text, UIFont.SystemFontOfSize(14), new CGSize(115, float.MaxValue), UILineBreakMode.WordWrap);
view.Layer.AddSublayer(CreateCATextLayer(style, text));
view.BackgroundColor = new UIColor(ToCGColor(style.BackColor.Color));
image = ToImage(view, new CGRect(0, 0, (float)bitmapSize.Width, (float)bitmapSize.Height));
handle.Set();
});
handle.WaitOne();
using (var nsdata = image.AsPNG())
{
return new MemoryStream(nsdata.ToArray());
}
}
private static int DetermineHorizontalAlignmentCorrection(LabelStyle.HorizontalAlignmentEnum horizontalAlignment,
int width)
{
if (horizontalAlignment == LabelStyle.HorizontalAlignmentEnum.Left) return width / 2;
if (horizontalAlignment == LabelStyle.HorizontalAlignmentEnum.Right) return -width / 2;
return 0; // center
}
private static int DetermineVerticalAlignmentCorrection(LabelStyle.VerticalAlignmentEnum verticalAlignment,
int height)
{
if (verticalAlignment == LabelStyle.VerticalAlignmentEnum.Top) return -height / 2;
if (verticalAlignment == LabelStyle.VerticalAlignmentEnum.Bottom) return height / 2;
return 0; // center
}
public static void RenderTexture(SKCanvas canvas, SKBitmap bitmap, float x, float y, float orientation = 0,
float offsetX = 0, float offsetY = 0,
LabelStyle.HorizontalAlignmentEnum horizontalAlignment = LabelStyle.HorizontalAlignmentEnum.Center,
LabelStyle.VerticalAlignmentEnum verticalAlignment = LabelStyle.VerticalAlignmentEnum.Center,
float opacity = 1f,
float scale = 1f)
{
canvas.Save();
canvas.Translate(x, y);
canvas.RotateDegrees(orientation, 0, 0); // todo: or degrees?
canvas.Scale(scale, scale);
x = offsetX + DetermineHorizontalAlignmentCorrection(horizontalAlignment, bitmap.Width);
y = -offsetY + DetermineVerticalAlignmentCorrection(verticalAlignment, bitmap.Height);
var halfWidth = bitmap.Width/2;
var halfHeight = bitmap.Height/2;
var rect = new SKRect(x - halfWidth, y - halfHeight, x + halfWidth, y + halfHeight);
RenderTexture(canvas, bitmap, rect, opacity);
canvas.Restore();
}
public StackedLabelProvider(IProvider provider, LabelStyle labelStyle, Pen rectangleLine = null,
Brush rectangleFill = null)
{
_provider = provider;
_labelStyle = labelStyle;
_rectangleLine = rectangleLine ?? new Pen(Color.Gray);
_rectangleFill = rectangleFill;
}
public LabelStyle(LabelStyle labelStyle)
{
Font = new Font(labelStyle.Font);
Offset = new Offset(labelStyle.Offset);
CollisionDetection = false;
CollisionBuffer = new Size(labelStyle.CollisionBuffer);
ForeColor = new Color(labelStyle.ForeColor);
BackColor = new Brush(labelStyle.BackColor);
HorizontalAlignment = HorizontalAlignmentEnum.Center;
VerticalAlignment = VerticalAlignmentEnum.Center;
}
public LabelStyle(LabelStyle labelStyle)
{
Font = new Font(labelStyle.Font);
Offset = new Offset(labelStyle.Offset);
CollisionDetection = false;
ForeColor = new Color(labelStyle.ForeColor);
BackColor = new Brush(labelStyle.BackColor);
HorizontalAlignment = HorizontalAlignmentEnum.Center;
VerticalAlignment = VerticalAlignmentEnum.Center;
Text = labelStyle.Text;
LabelColumn = labelStyle.LabelColumn;
LabelMethod = labelStyle.LabelMethod;
}
public static void Draw(LabelStyle style, string text, float x, float y)
{
var key = text + "_" + style.Font.FontFamily + "_" + style.Font.Size + "_" + (float)style.Font.Size + "_" + style.BackColor + "_" + style.ForeColor;
if (!LabelBitmapCache.Keys.Contains(key))
{
var memoryStream = PlatformLabelBitmap.Create(style, text);
LabelBitmapCache[key] = TextureHelper.LoadTexture(memoryStream);
}
var info = LabelBitmapCache[key];
TextureHelper.RenderTexture(info, x, y, offsetX:(float)style.Offset.X, offsetY:(float)style.Offset.Y,
horizontalAlignment: style.HorizontalAlignment, verticalAlignment: style.VerticalAlignment);
}
private static SKPaint CreatePaint(LabelStyle style)
{
return new SKPaint
{
TextSize = (float) style.Font.Size,
IsAntialias = true,
Color = style.ForeColor.ToSkia(),
Typeface = SKTypeface.FromFamilyName(style.Font.FontFamily),
IsStroke = false,
FakeBoldText = false,
IsEmbeddedBitmapText = true
};
}
private static void DetermineTextWidthAndHeightWpf(out double width, out double height, LabelStyle style, string text)
{
// in WPF the width and height is not calculated at this point. So we use FormattedText
var formattedText = new FormattedText(
text,
CultureInfo.InvariantCulture,
FlowDirection.LeftToRight,
new Typeface(style.Font.FontFamily),
style.Font.Size,
new SolidColorBrush(style.ForeColor.ToXaml()));
width = formattedText.Width;
height = formattedText.Height;
}
public static void DrawAsBitmap(SKCanvas canvas, LabelStyle style, IFeature feature, float x, float y)
{
var text = style.GetLabelText(feature);
var key = text + "_" + style.Font.FontFamily + "_" + style.Font.Size + "_" + (float)style.Font.Size + "_" +
style.BackColor + "_" + style.ForeColor;
if (!LabelBitmapCache.Keys.Contains(key))
LabelBitmapCache[key] = new SKBitmapInfo { Bitmap = CreateLabelAsBitmap(style, text) };
var info = LabelBitmapCache[key];
BitmapHelper.RenderTexture(canvas, info.Bitmap, (int)Math.Round(x), (int)Math.Round(y),
offsetX: (float)style.Offset.X, offsetY: (float)-style.Offset.Y,
horizontalAlignment: style.HorizontalAlignment, verticalAlignment: style.VerticalAlignment);
}
private static SKBitmap CreateLabelAsBitmap(LabelStyle style, string text, SKPaint paint)
{
var rect = new SKRect();
paint.MeasureText(text, ref rect);
var backRect = new SKRect(0, 0, rect.Width + 6, rect.Height + 6);
var bitmap = new SKBitmap((int)backRect.Width, (int)backRect.Height);
using (var target = new SKCanvas(bitmap))
{
target.Clear();
DrawBackground(style, backRect, target);
target.DrawText(text, -rect.Left + 3, -rect.Top +3, paint);
return bitmap;
}
}
public static UIElement RenderLabel(Geometries.Point position, LabelStyle labelStyle, IViewport viewport, string labelText)
{
var screenPosition = viewport.WorldToScreen(position);
var windowsPosition = screenPosition.ToXaml();
//set some defaults which should be configurable someday
const double witdhMargin = 3.0;
const double heightMargin = 0.0;
var textblock = new TextBlock
{
Text = labelText,
Foreground = new SolidColorBrush(labelStyle.ForeColor.ToXaml()),
FontFamily = new FontFamily(labelStyle.Font.FontFamily),
FontSize = labelStyle.Font.Size,
Margin = new Thickness(witdhMargin, heightMargin, witdhMargin, heightMargin),
FontWeight = FontWeights.Bold
};
var border = new Border
{
Background = new SolidColorBrush(labelStyle.BackColor == null ? Colors.Transparent : labelStyle.BackColor.Color.ToXaml()),
CornerRadius = new CornerRadius(4),
Child = textblock
};
double textWidth;
double textHeight;
#if NETFX_CORE
DetermineTextWidthAndHeightWindows8(out textWidth, out textHeight, border, textblock);
#elif SILVERLIGHT
DetermineTextWidthAndHeightSilverlight(out textWidth, out textHeight, textblock);
#else // WPF
DetermineTextWidthAndHeightWpf(out textWidth, out textHeight, labelStyle, labelText);
#endif
border.SetValue(Canvas.LeftProperty, windowsPosition.X + labelStyle.Offset.X
- (textWidth + 2 * witdhMargin) * (short)labelStyle.HorizontalAlignment * 0.5f);
border.SetValue(Canvas.TopProperty, windowsPosition.Y + labelStyle.Offset.Y
- (textHeight + 2 * heightMargin) * (short)labelStyle.VerticalAlignment * 0.5f);
return border;
}
public static MemoryStream Create(LabelStyle style, string text)
{
var font = new Font(style.Font.FontFamily, (float)style.Font.Size, FontStyle.Bold);
var size = _graphics.MeasureString(text, font);
var targetBitmap = new Bitmap((int)Math.Ceiling(size.Width), (int)Math.Ceiling(size.Height),
System.Drawing.Imaging.PixelFormat.Format32bppArgb);
var targetGraphics = Graphics.FromImage(targetBitmap);
targetGraphics.TextRenderingHint = TextRenderingHint.AntiAlias;
// Render a text label
targetGraphics.Clear((style.BackColor == null) ? Color.Transparent : ToGdi(style.BackColor.Color));
targetGraphics.DrawString(text, font, new SolidBrush(ToGdi(style.ForeColor)), PointF.Empty);
var memoryStream = new MemoryStream();
targetBitmap.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Png);
memoryStream.Position = 0;
return memoryStream;
}
private static CATextLayer CreateCATextLayer(LabelStyle style, string text)
{
var label = new CATextLayer ();
var ctFont = new CoreText.CTFont (style.Font.FontFamily, (float)style.Font.Size);
var aString = new Foundation.NSAttributedString (text,
new CoreText.CTStringAttributes() { Font = ctFont });
label.SetFont(ctFont);
label.FontSize = (float)style.Font.Size;
label.ForegroundColor = ToCGColor(style.ForeColor);
label.BackgroundColor = TransparentColor;
label.ShadowOpacity = 0;
label.BorderWidth = 0;
label.String = text;
var size = GetSizeForText (0, aString);
label.Frame = new CGRect (0, 0, size.Width, size.Height);
return label;
}
public static MemoryStream Create(LabelStyle style, string text)
{
throw new NotImplementedException();
}
private static void getTextWidthAndHeight(ref double width, ref double height, LabelStyle style, string text)
{
var formattedText = new FormattedText(
text,
CultureInfo.InvariantCulture,
FlowDirection.LeftToRight,
new Typeface(style.Font.FontFamily),
style.Font.Size,
new SolidColorBrush(style.ForeColor.ToXaml()));
width = formattedText.Width;
height = formattedText.Height;
}
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;
}
private static GradientTheme CreateCountryLabelTheme()
{
//Lets scale the labels so that big countries have larger texts as well
var lblMin = new LabelStyle();
var lblMax = new LabelStyle();
lblMin.ForeColor = Color.Black;
lblMin.Font = new Font { FontFamily = "GenericSerif", Size = 6 };
lblMax.ForeColor = Color.Blue;
lblMax.BackColor = new Brush { Color = new Color { A = 128, R = 255, G = 255, B = 255 } };
lblMin.BackColor = lblMax.BackColor;
lblMax.Font = new Font { FontFamily = "GenericSerif", Size = 9 };
var labelTheme = new GradientTheme("PopDens", 0, 400, lblMin, lblMax);
return labelTheme;
}
private static LabelStyle CreateCityLabelTheme()
{
var cityLabelStyle = new LabelStyle();
cityLabelStyle.ForeColor = Color.Black;
cityLabelStyle.BackColor = new Brush { Color = Color.Orange };
cityLabelStyle.Font = new Font { FontFamily = "GenericSerif", Size = 11 };
cityLabelStyle.HorizontalAlignment = LabelStyle.HorizontalAlignmentEnum.Center;
cityLabelStyle.VerticalAlignment = LabelStyle.VerticalAlignmentEnum.Center;
cityLabelStyle.Offset = new Offset { X = 0, Y = 0 };
cityLabelStyle.Halo = new Pen { Color = Color.Yellow, Width = 2 };
cityLabelStyle.CollisionDetection = true;
return cityLabelStyle;
}
public static Map InitializeMap()
{
//Initialize a new map based on the simple map
var map = new Map();
//Layer osm = new Layer("OSM");
//string url = "http://labs.metacarta.com/wms-c/tilecache.py?version=1.1.1&request=GetCapabilities&service=wms-c";
//var tileSources = TileSourceWmsC.TileSourceBuilder(new Uri(url), null);
//var tileSource = new List<ITileSource>(tileSources).Find(source => source.Schema.Name == "osm-map");
//osm.DataSource = new TileProvider(tileSource, "OSM");
//map.Layers.Add(osm);
//Set up countries layer
var countryLayer = new Layer("Countries");
//Set the datasource to a shapefile in the App_data folder
countryLayer.DataSource = new ShapeFile("GeoData/World/countries.shp", true);
countryLayer.DataSource.SRID = 4326;
var style = new VectorStyle
{
Fill = new Brush { Color = Color.Green },
Outline = new Pen { Color = Color.Black }
};
countryLayer.Styles.Add(style);
map.Layers.Add(countryLayer);
//set up cities layer
var cityLayer = new Layer("Cities");
//Set the datasource to a shapefile in the App_data folder
cityLayer.DataSource = new ShapeFile("GeoData/World/cities.shp", true);
cityLayer.DataSource.SRID = 4326;
cityLayer.MaxVisible = 0.09;
map.Layers.Add(cityLayer);
//Set up a country label layer
var countryLabelLayer = new LabelLayer("Country labels");
countryLabelLayer.DataSource = countryLayer.DataSource;
countryLabelLayer.DataSource.SRID = 4326;
countryLabelLayer.Enabled = true;
countryLabelLayer.MaxVisible = 0.18;
countryLabelLayer.MinVisible = 0.054;
countryLabelLayer.LabelColumn = "NAME";
var labelStyle = new LabelStyle();
labelStyle.ForeColor = Color.Black;
labelStyle.Font = new Font { FontFamily = "GenericSerif", Size = 12 };
labelStyle.BackColor = new Brush { Color = new Color { A = 128, R = 255, G = 255, B = 255 } };
labelStyle.HorizontalAlignment = LabelStyle.HorizontalAlignmentEnum.Center;
countryLabelLayer.MultipartGeometryBehaviour = LabelLayer.MultipartGeometryBehaviourEnum.Largest;
countryLabelLayer.Styles.Add(labelStyle);
map.Layers.Add(countryLabelLayer);
//Set up a city label layer
var cityLabelLayer = new LabelLayer("City labels");
cityLabelLayer.DataSource = cityLayer.DataSource;
cityLabelLayer.DataSource.SRID = 4326;
cityLabelLayer.Enabled = true;
cityLabelLayer.LabelColumn = "NAME";
cityLabelLayer.MaxVisible = countryLabelLayer.MinVisible;
cityLabelLayer.MinVisible = 0;
cityLabelLayer.LabelFilter = LabelCollisionDetection.ThoroughCollisionDetection;
var cityLabelStyle = new LabelStyle();
cityLabelStyle.ForeColor = Color.Black;
cityLabelStyle.Font = new Font { FontFamily = "GenericSerif", Size = 11 };
cityLabelStyle.HorizontalAlignment = LabelStyle.HorizontalAlignmentEnum.Left;
cityLabelStyle.VerticalAlignment = LabelStyle.VerticalAlignmentEnum.Bottom;
cityLabelStyle.Offset = new Offset { X = 3, Y = 3 };
cityLabelStyle.Halo = new Pen { Color = Color.Yellow, Width = 2 };
cityLabelStyle.CollisionDetection = true;
cityLabelLayer.Styles.Add(cityLabelStyle);
map.Layers.Add(cityLabelLayer);
//Set a gradient theme on the countries layer, based on Population density
//First create two styles that specify min and max styles
//In this case we will just use the default values and override the fill-colors
//using a colorblender. If different line-widths, line- and fill-colors where used
//in the min and max styles, these would automatically get linearly interpolated.
IStyle min = new Style();
IStyle max = new Style();
//Create theme using a density from 0 (min) to 400 (max)
var popdens = new GradientTheme("PopDens", 0, 400, min, max);
//We can make more advanced coloring using the ColorBlend'er.
//Setting the FillColorBlend will override any fill-style in the min and max fills.
//In this case we just use the predefined Rainbow colorscale
popdens.FillColorBlend = ColorBlend.Rainbow5;
countryLayer.Styles.Add(popdens);
//Lets scale the labels so that big countries have larger texts as well
var lblMin = new LabelStyle();
var lblMax = new LabelStyle();
lblMin.ForeColor = Color.Black;
lblMin.Font = new Font { FontFamily = "Sans Serif", Size = 6 };
lblMax.ForeColor = Color.Black;
lblMax.BackColor = new Brush { Color = new Color { A = 128, R = 255, G = 255, B = 255 } };
lblMin.BackColor = lblMax.BackColor;
lblMax.Font = new Font { FontFamily = "Sans Serif", Size = 9 };
countryLabelLayer.Styles.Add(new GradientTheme("PopDens", 0, 400, lblMin, lblMax));
//Lets scale city icons based on city population
//cities below 1.000.000 gets the smallest symbol, and cities with more than 5.000.000 the largest symbol
var citymin = new SymbolStyle();
var citymax = new SymbolStyle();
const string iconPath = "Images/icon.png";
if (!File.Exists(iconPath))
{
throw new Exception(
String.Format("Error file '{0}' could not be found, make sure it is at the expected location",
iconPath));
}
citymin.Symbol = new Bitmap { Data = new FileStream(iconPath, FileMode.Open, FileAccess.Read) };
citymin.SymbolScale = 0.5f;
citymax.Symbol = new Bitmap { Data = new FileStream(iconPath, FileMode.Open, FileAccess.Read) };
citymax.SymbolScale = 1f;
cityLayer.Styles.Add(new GradientTheme("Population", 1000000, 5000000, citymin, citymax));
var geodanLayer = new Layer("Geodan");
geodanLayer.DataSource = new MemoryProvider(new Point(4.9130567, 52.3422033));
geodanLayer.Styles.Add(new SymbolStyle { Symbol = new Bitmap { Data = new FileStream(iconPath, FileMode.Open, FileAccess.Read) } });
map.Layers.Add(geodanLayer);
//limit the zoom to 360 degrees width
map.BackColor = Color.White;
return map;
}
private static Label CreateLabel(IGeometry feature, string text, float rotation, int priority, LabelStyle style, IViewport viewport,
Graphics g)
{
var gdiSize = g.MeasureString(text, style.Font.ToGdi());
var size = new Styles.Size { Width = gdiSize.Width, Height = gdiSize.Height };
var position = viewport.WorldToScreen(feature.GetBoundingBox().GetCentroid());
position.X = position.X - size.Width * (short)style.HorizontalAlignment * 0.5f;
position.Y = position.Y - size.Height * (short)style.VerticalAlignment * 0.5f;
if (position.X - size.Width > viewport.Width || position.X + size.Width < 0 ||
position.Y - size.Height > viewport.Height || position.Y + size.Height < 0)
return null;
Label label;
if (!style.CollisionDetection)
label = new Label(text, position, rotation, priority, null, style);
else
{
//Collision detection is enabled so we need to measure the size of the string
label = new Label(text, position, rotation, priority,
new LabelBox(position.X - size.Width * 0.5f - style.CollisionBuffer.Width,
position.Y + size.Height * 0.5f + style.CollisionBuffer.Height,
size.Width + 2f * style.CollisionBuffer.Width,
size.Height + style.CollisionBuffer.Height * 2f), style);
}
if (!(feature is LineString)) return label;
var line = feature as LineString;
if (line.Length / viewport.Resolution > size.Width) //Only label feature if it is long enough
CalculateLabelOnLinestring(line, ref label, viewport);
else
return null;
return label;
}
private static void DrawLabel(SKCanvas target, float x, float y, LabelStyle style, string text)
{
var paint = CreatePaint(style);
var rect = new SKRect();
paint.MeasureText(text, ref rect);
var align = CalcAlignFactor(style.VerticalAlignment);
rect.Offset(
x - rect.Width*0.5f + (float) style.Offset.X,
y + rect.Height*0.5f + (float) style.Offset.Y);
var backRect = rect;
backRect.Inflate(3, 3);
DrawBackground(style, backRect, target);
target.DrawText(text, rect.Left, rect.Bottom, paint);
}
public static CALayer RenderLabel(Mapsui.Geometries.Point point, LabelStyle style, IViewport viewport)
{
//Offset stackOffset,
//return RenderLabel(point, stackOffset, style, viewport, style.Text);
return new CALayer ();
}
public static void Draw(SKCanvas canvas, LabelStyle style, IFeature feature, float x, float y)
{
var text = style.GetLabelText(feature);
DrawLabel(canvas, x, y, style, text);
}
private static object CalcAlignFactor(LabelStyle.VerticalAlignmentEnum verticalAlignment)
{
return (verticalAlignment == LabelStyle.VerticalAlignmentEnum.Center) ? 0.5f : 0f;
}
private static void DrawBackground(LabelStyle style, SKRect rect, SKCanvas target)
{
if (style.BackColor != null)
{
var color = style.BackColor?.Color?.ToSkia();
if (color.HasValue)
{
var rounding = 6;
using (var backgroundPaint = new SKPaint {Color = color.Value})
{
target.DrawRoundRect(rect, rounding, rounding, backgroundPaint);
}
}
}
}
