public static List <MGLPaint> ConvertLineLayer(JsonStyleLayer jsonStyleLayer, MGLSpriteAtlas spriteAtlas)
{
var layout = jsonStyleLayer?.Layout;
var paint = jsonStyleLayer?.Paint;
var line = new MGLPaint();
// Set defaults
line.SetFixColor(new SKColor(0, 0, 0, 0));
line.SetFixStyle(SKPaintStyle.Stroke);
line.SetFixStrokeWidth(0);
line.SetFixStrokeCap(SKStrokeCap.Butt);
line.SetFixStrokeJoin(SKStrokeJoin.Miter);
// If we don't have a paint, than there isn't anything that we could do
if (paint == null)
{
return(new List <MGLPaint>()
{
line
});
}
// line-cap
// Optional enum. One of butt, round, square. Defaults to butt. Interval.
// The display of line endings.
if (layout?.LineCap != null)
{
if (layout.LineCap.Stops != null)
{
line.SetVariableStrokeCap((context) =>
{
switch (layout.LineCap.Evaluate(context.Zoom))
{
case "butt":
return(SKStrokeCap.Butt);
case "round":
return(SKStrokeCap.Round);
case "square":
return(SKStrokeCap.Square);
default:
return(SKStrokeCap.Butt);
}
});
}
else
{
switch (layout.LineCap.SingleVal)
{
case "butt":
line.SetFixStrokeCap(SKStrokeCap.Butt);
break;
case "round":
line.SetFixStrokeCap(SKStrokeCap.Round);
break;
case "square":
line.SetFixStrokeCap(SKStrokeCap.Square);
break;
default:
line.SetFixStrokeCap(SKStrokeCap.Butt);
break;
}
}
}
// line-join
// Optional enum. One of bevel, round, miter. Defaults to miter. Interval.
// The display of lines when joining.
if (layout?.LineJoin != null)
{
if (layout.LineJoin.Stops != null)
{
line.SetVariableStrokeJoin((context) =>
{
switch (layout.LineJoin.Evaluate(context.Zoom))
{
case "bevel":
return(SKStrokeJoin.Bevel);
case "round":
return(SKStrokeJoin.Round);
case "mitter":
return(SKStrokeJoin.Miter);
default:
return(SKStrokeJoin.Miter);
}
});
}
else
{
switch (layout.LineJoin.SingleVal)
{
case "bevel":
line.SetFixStrokeJoin(SKStrokeJoin.Bevel);
break;
case "round":
line.SetFixStrokeJoin(SKStrokeJoin.Round);
break;
case "mitter":
line.SetFixStrokeJoin(SKStrokeJoin.Miter);
break;
default:
line.SetFixStrokeJoin(SKStrokeJoin.Miter);
break;
}
}
}
// line-color
// Optional color. Defaults to #000000. Disabled by line-pattern. Exponential.
// The color with which the line will be drawn.
if (paint?.LineColor != null)
{
if (paint.LineColor.Stops != null)
{
line.SetVariableColor((context) => jsonStyleLayer.Paint.LineColor.Evaluate(context.Zoom));
}
else
{
line.SetFixColor(jsonStyleLayer.Paint.LineColor.SingleVal);
}
}
// line-width
// Optional number.Units in pixels.Defaults to 1. Exponential.
// Stroke thickness.
if (paint?.LineWidth != null)
{
if (paint.LineWidth.Stops != null)
{
line.SetVariableStrokeWidth((context) => jsonStyleLayer.Paint.LineWidth.Evaluate(context.Zoom));
}
else
{
line.SetFixStrokeWidth(jsonStyleLayer.Paint.LineWidth.SingleVal);
}
}
// line-opacity
// Optional number. Defaults to 1. Exponential.
// The opacity at which the line will be drawn.
if (paint?.LineOpacity != null)
{
if (paint.LineOpacity.Stops != null)
{
line.SetVariableOpacity((context) => jsonStyleLayer.Paint.LineOpacity.Evaluate(context.Zoom));
}
else
{
line.SetFixOpacity(jsonStyleLayer.Paint.LineOpacity.SingleVal);
}
}
// line-dasharray
// Optional array. Units in line widths. Disabled by line-pattern. Interval.
// Specifies the lengths of the alternating dashes and gaps that form the dash pattern.
// The lengths are later scaled by the line width.To convert a dash length to pixels,
// multiply the length by the current line width.
if (paint?.LineDashArray != null)
{
if (paint.LineDashArray.Stops != null)
{
line.SetVariableDashArray((context) => jsonStyleLayer.Paint.LineDashArray.Evaluate(context.Zoom));
}
else
{
line.SetFixDashArray(jsonStyleLayer.Paint.LineDashArray.SingleVal);
}
}
// line-miter-limit
// Optional number. Defaults to 2. Requires line-join = miter. Exponential.
// Used to automatically convert miter joins to bevel joins for sharp angles.
// line-round-limit
// Optional number. Defaults to 1.05. Requires line-join = round. Exponential.
// Used to automatically convert round joins to miter joins for shallow angles.
// line-translate
// Optional array. Units in pixels.Defaults to 0,0. Exponential.
// The geometry's offset. Values are [x, y] where negatives indicate left and up,
// respectively.
// line-translate-anchor
// Optional enum. One of map, viewport.Defaults to map. Requires line-translate. Interval.
// Control whether the translation is relative to the map (north) or viewport (screen)
// line-gap-width
// Optional number.Units in pixels.Defaults to 0. Exponential.
// Draws a line casing outside of a line's actual path.Value indicates the width of
// the inner gap.
// line-offset
// Optional number. Units in pixels. Defaults to 0. Exponential.
// The line's offset perpendicular to its direction. Values may be positive or negative,
// where positive indicates "rightwards" (if you were moving in the direction of the line)
// and negative indicates "leftwards".
// line-blur
// Optional number. Units in pixels.Defaults to 0. Exponential.
// Blur applied to the line, in pixels.
// line-pattern
// Optional string. Interval.
// Name of image in sprite to use for drawing image lines. For seamless patterns, image
// width must be a factor of two (2, 4, 8, …, 512).
return(new List <MGLPaint>()
{
line
});
}
public static List <MGLPaint> ConvertFillLayer(JsonStyleLayer jsonStyleLayer, MGLSpriteAtlas spriteAtlas)
{
var layout = jsonStyleLayer?.Layout;
var paint = jsonStyleLayer?.Paint;
var area = new MGLPaint();
var line = new MGLPaint();
// Set defaults
area.SetFixColor(new SKColor(0, 0, 0, 0));
area.SetFixOpacity(1);
area.SetFixStyle(SKPaintStyle.Fill);
line.SetFixColor(new SKColor(0, 0, 0, 0));
line.SetFixOpacity(1);
line.SetFixStyle(SKPaintStyle.Stroke);
line.SetFixStrokeWidth(0);
// If we don't have a paint, than there isn't anything that we could do
if (paint == null)
{
return(new List <MGLPaint>()
{
area, line
});
}
// fill-color
// Optional color. Defaults to #000000. Disabled by fill-pattern. Exponential.
// The color of the filled part of this layer. This color can be specified as
// rgba with an alpha component and the color's opacity will not affect the
// opacity of the 1px stroke, if it is used.
if (paint.FillColor != null)
{
if (paint.FillColor.Stops != null)
{
area.SetVariableColor((context) => jsonStyleLayer.Paint.FillColor.Evaluate(context.Zoom));
line.SetVariableColor((context) => jsonStyleLayer.Paint.FillColor.Evaluate(context.Zoom));
}
else
{
area.SetFixColor(jsonStyleLayer.Paint.FillColor.SingleVal);
line.SetFixColor(jsonStyleLayer.Paint.FillColor.SingleVal);
}
}
// fill-outline-color
// Optional color. Disabled by fill-pattern. Requires fill-antialias = true. Exponential.
// The outline color of the fill. Matches the value of fill-color if unspecified.
if (paint.FillOutlineColor != null && paint.FillAntialias != null)
{
if (paint.FillOutlineColor.Stops != null)
{
line.SetVariableColor((context) => jsonStyleLayer.Paint.FillOutlineColor.Evaluate(context.Zoom));
}
else
{
line.SetFixColor(jsonStyleLayer.Paint.FillOutlineColor.SingleVal);
}
}
// fill-opacity
// Optional number. Defaults to 1. Exponential.
// The opacity of the entire fill layer. In contrast to the fill-color, this
// value will also affect the 1px stroke around the fill, if the stroke is used.
if (paint.FillOpacity != null)
{
if (paint.FillOpacity.Stops != null)
{
area.SetVariableOpacity((context) => jsonStyleLayer.Paint.FillOpacity.Evaluate(context.Zoom));
line.SetVariableOpacity((context) => jsonStyleLayer.Paint.FillOpacity.Evaluate(context.Zoom));
}
else
{
area.SetFixOpacity(jsonStyleLayer.Paint.FillOpacity.SingleVal);
line.SetFixOpacity(jsonStyleLayer.Paint.FillOpacity.SingleVal);
}
}
// fill-antialias
// Optional boolean. Defaults to true. Interval.
// Whether or not the fill should be antialiased.
if (paint.FillAntialias != null)
{
if (paint.FillAntialias.Stops != null)
{
area.SetVariableAntialias((context) => jsonStyleLayer.Paint.FillAntialias.Evaluate(context.Zoom));
line.SetVariableAntialias((context) => jsonStyleLayer.Paint.FillAntialias.Evaluate(context.Zoom));
}
else
{
area.SetFixAntialias(jsonStyleLayer.Paint.FillAntialias.SingleVal == null ? false : (bool)jsonStyleLayer.Paint.FillAntialias.SingleVal);
line.SetFixAntialias(jsonStyleLayer.Paint.FillAntialias.SingleVal == null ? false : (bool)jsonStyleLayer.Paint.FillAntialias.SingleVal);
}
}
// fill-translate
// Optional array. Units in pixels. Defaults to 0,0. Exponential.
// The geometry's offset. Values are [x, y] where negatives indicate left and up,
// respectively.
// TODO: Use matrix of paint object for this
// fill-translate-anchor
// Optional enum. One of map, viewport. Defaults to map. Requires fill-translate. Interval.
// Control whether the translation is relative to the map (north) or viewport (screen)
// TODO: Use matrix of paint object for this
// fill-pattern
// Optional string. Interval.
// Name of image in sprite to use for drawing image fills. For seamless patterns,
// image width and height must be a factor of two (2, 4, 8, …, 512).
if (paint.FillPattern != null)
{
// FillPattern needs a color. Instead no pattern is drawn.
area.SetFixColor(SKColors.Black);
if (paint.FillPattern.Stops == null && !paint.FillPattern.SingleVal.Contains("{"))
{
area.SetVariableShader((context) =>
{
var name = paint.FillPattern.SingleVal;
var sprite = spriteAtlas.GetSprite(name);
if (sprite != null && sprite.Image != null)
{
return(sprite.Image.ToShader(SKShaderTileMode.Repeat, SKShaderTileMode.Repeat, SKMatrix.MakeScale(context.Scale, context.Scale)));
}
else
{
// Log information, that no sprite is found
// TODO
// Logging.Logger.Log(Logging.LogLevel.Information, $"Fill pattern {name} not found");
return(null);
}
});
}
else
{
area.SetVariableShader((context) =>
{
var name = ReplaceFields(jsonStyleLayer.Paint.FillPattern.Evaluate(context.Zoom), context.Tags);
var sprite = spriteAtlas.GetSprite(name);
if (sprite != null && sprite.Image != null)
{
return(sprite.Image.ToShader(SKShaderTileMode.Repeat, SKShaderTileMode.Repeat, SKMatrix.MakeScale(context.Scale, context.Scale)));
}
else
{
// Log information, that no sprite is found
// TODO
// Logging.Logger.Log(Logging.LogLevel.Information, $"Fill pattern {name} not found");
return(null);
}
});
}
}
return(new List <MGLPaint>()
{
area, line
});
}