private static MRect GrowBox(MRect box, double resolution)
{
const int symbolSize = 32; // todo: determine margin by symbol size
const int boxMargin = symbolSize / 2;
return(box.Grow(boxMargin * resolution));
}
public override IEnumerable <IFeature> GetFeatures(MRect box, double resolution)
{
if (box == null)
{
return(Enumerable.Empty <IFeature>());
}
var biggerBox = box.Grow(
SymbolStyle.DefaultWidth * 2 * resolution,
SymbolStyle.DefaultHeight * 2 * resolution);
var fetchInfo = new FetchInfo(biggerBox, resolution, CRS);
if (DataSource is null)
{
return(Enumerable.Empty <IFeature>());
}
#pragma warning disable VSTHRD002 // Allow use of .Result for test purposes
return(DataSource.GetFeaturesAsync(fetchInfo).Result);
#pragma warning restore VSTHRD002 //
}
public void Draw(SKCanvas canvas, IReadOnlyViewport viewport, IWidget widget,
float layerOpacity)
{
var scaleBar = (ScaleBarWidget)widget;
if (!scaleBar.CanProject())
{
return;
}
// If this is the first time, we call this renderer, ...
if (_paintScaleBar == null)
{
// ... than create the paints
_paintScaleBar = CreateScaleBarPaint(SKPaintStyle.Fill);
_paintScaleBarStroke = CreateScaleBarPaint(SKPaintStyle.Stroke);
_paintScaleText = CreateTextPaint(SKPaintStyle.Fill);
_paintScaleTextStroke = CreateTextPaint(SKPaintStyle.Stroke);
}
// Update paints with new values
_paintScaleBar.Color = scaleBar.TextColor.ToSkia(layerOpacity);
_paintScaleBar.StrokeWidth = scaleBar.StrokeWidth * scaleBar.Scale;
_paintScaleBarStroke !.Color = scaleBar.Halo.ToSkia(layerOpacity);
_paintScaleBarStroke.StrokeWidth = scaleBar.StrokeWidthHalo * scaleBar.Scale;
_paintScaleText !.Color = scaleBar.TextColor.ToSkia(layerOpacity);
_paintScaleText.StrokeWidth = scaleBar.StrokeWidth * scaleBar.Scale;
_paintScaleText.Typeface = SKTypeface.FromFamilyName(scaleBar.Font?.FontFamily,
SKFontStyleWeight.Bold, SKFontStyleWidth.Normal, SKFontStyleSlant.Upright);
_paintScaleText.TextSize = (float)(scaleBar.Font?.Size ?? 10) * scaleBar.Scale;
_paintScaleTextStroke !.Color = scaleBar.Halo.ToSkia(layerOpacity);
_paintScaleTextStroke.StrokeWidth = scaleBar.StrokeWidthHalo / 2 * scaleBar.Scale;
_paintScaleTextStroke.Typeface = SKTypeface.FromFamilyName(scaleBar.Font?.FontFamily,
SKFontStyleWeight.Bold, SKFontStyleWidth.Normal, SKFontStyleSlant.Upright);
_paintScaleTextStroke.TextSize = (float)(scaleBar.Font?.Size ?? 10) * scaleBar.Scale;
float scaleBarLength1;
string?scaleBarText1;
float scaleBarLength2;
string?scaleBarText2;
(scaleBarLength1, scaleBarText1, scaleBarLength2, scaleBarText2) = scaleBar.GetScaleBarLengthAndText(viewport);
// Calc height of scale bar
var textSize = SKRect.Empty;
// Do this, because height of text changes sometimes (e.g. from 2 m to 1 m)
_paintScaleTextStroke.MeasureText("9999 m", ref textSize);
var scaleBarHeight = textSize.Height + (scaleBar.TickLength + scaleBar.StrokeWidthHalo * 0.5f + scaleBar.TextMargin) * scaleBar.Scale;
if (scaleBar.ScaleBarMode == ScaleBarMode.Both && scaleBar.SecondaryUnitConverter != null)
{
scaleBarHeight *= 2;
}
else
{
scaleBarHeight += scaleBar.StrokeWidthHalo * 0.5f * scaleBar.Scale;
}
scaleBar.Height = scaleBarHeight;
// Draw lines
// Get lines for scale bar
var points = scaleBar.GetScaleBarLinePositions(viewport, scaleBarLength1, scaleBarLength2, scaleBar.StrokeWidthHalo);
// Draw outline of scale bar
for (var i = 0; i < points.Count; i += 2)
{
canvas.DrawLine((float)points[i].X, (float)points[i].Y, (float)points[i + 1].X, (float)points[i + 1].Y, _paintScaleBarStroke);
}
// Draw scale bar
for (var i = 0; i < points.Count; i += 2)
{
canvas.DrawLine((float)points[i].X, (float)points[i].Y, (float)points[i + 1].X, (float)points[i + 1].Y, _paintScaleBar);
}
if (!points.Any())
{
throw new NotImplementedException($"A {nameof(ScaleBarWidget)} can not be drawn without line positions");
}
var envelop = new MRect(points.Select(p => p.MRect));
envelop = envelop.Grow(scaleBar.StrokeWidthHalo * 0.5f * scaleBar.Scale);
// Draw text
// Calc text height
var textSize1 = SKRect.Empty;
var textSize2 = SKRect.Empty;
scaleBarText1 ??= string.Empty;
_paintScaleTextStroke.MeasureText(scaleBarText1, ref textSize1);
if (scaleBar.ScaleBarMode == ScaleBarMode.Both && scaleBar.SecondaryUnitConverter != null)
{
// If there is SecondaryUnitConverter we need to calculate the size before passing it into GetScaleBarTextPositions
scaleBarText2 ??= string.Empty;
_paintScaleTextStroke.MeasureText(scaleBarText2, ref textSize2);
}
var(posX1, posY1, posX2, posY2) = scaleBar.GetScaleBarTextPositions(viewport, textSize.ToMRect(), textSize1.ToMRect(), textSize2.ToMRect(), scaleBar.StrokeWidthHalo);
// Now draw text
canvas.DrawText(scaleBarText1, posX1, posY1 - textSize1.Top, _paintScaleTextStroke);
canvas.DrawText(scaleBarText1, posX1, posY1 - textSize1.Top, _paintScaleText);
envelop = envelop?.Join(new MRect(posX1, posY1, posX1 + textSize1.Width, posY1 + textSize1.Height));
if (scaleBar.ScaleBarMode == ScaleBarMode.Both && scaleBar.SecondaryUnitConverter != null)
{
// Now draw second text
canvas.DrawText(scaleBarText2, posX2, posY2 - textSize2.Top, _paintScaleTextStroke);
canvas.DrawText(scaleBarText2, posX2, posY2 - textSize2.Top, _paintScaleText);
envelop = envelop?.Join(new MRect(posX2, posY2, posX2 + textSize2.Width, posY2 + textSize2.Height));
}
scaleBar.Envelope = envelop;
if (scaleBar.ShowEnvelop && envelop != null)
{
// Draw a rect around the scale bar for testing
var tempPaint = _paintScaleTextStroke;
canvas.DrawRect(new SKRect((float)envelop.MinX, (float)envelop.MinY, (float)envelop.MaxX, (float)envelop.MaxY), tempPaint);
}
}