private void DrawValueLabels(SKCanvas canvas, SKSize itemSize, Dictionary <ChartEntry, SKRect> valueLabelSizes)
{
ValueLabelOption valueLabelOption = ValueLabelOption;
if (ValueLabelOption == ValueLabelOption.TopOfChart && Series.Count() > 1)
{
valueLabelOption = ValueLabelOption.TopOfElement;
}
if (valueLabelOption == ValueLabelOption.TopOfElement || valueLabelOption == ValueLabelOption.OverElement)
{
foreach (var pps in pointsPerSerie)
{
var entries = pps.Key.Entries.ToArray();
for (int i = 0; i < pps.Value.Count; i++)
{
var entry = entries[i];
if (!string.IsNullOrEmpty(entry.ValueLabel))
{
var drawedPoint = pps.Value.ElementAt(i);
SKPoint point;
YPositionBehavior yPositionBehavior = YPositionBehavior.None;
var valueLabelSize = valueLabelSizes[entry];
if (valueLabelOption == ValueLabelOption.TopOfElement)
{
point = new SKPoint(drawedPoint.X, drawedPoint.Y - (PointSize / 2) - (Margin / 2));
if (ValueLabelOrientation == Orientation.Vertical)
{
yPositionBehavior = YPositionBehavior.UpToElementHeight;
}
}
else
{
if (ValueLabelOrientation == Orientation.Vertical)
{
yPositionBehavior = YPositionBehavior.UpToElementMiddle;
}
else
{
yPositionBehavior = YPositionBehavior.DownToElementMiddle;
}
point = new SKPoint(drawedPoint.X, drawedPoint.Y);
}
DrawHelper.DrawLabel(canvas, ValueLabelOrientation, yPositionBehavior, itemSize, point, entry.ValueLabelColor.WithAlpha((byte)(255 * AnimationProgress)), valueLabelSize, entry.ValueLabel, ValueLabelTextSize, Typeface, AllowValueLabelOverflow);
}
}
}
}
}
internal static void DrawLabel(SKCanvas canvas, Orientation orientation, YPositionBehavior yPositionBehavior, SKSize itemSize, SKPoint point, SKColor color, SKRect bounds, string text, float textSize, SKTypeface typeface, bool allowOverflow)
{
using (new SKAutoCanvasRestore(canvas))
{
using (var paint = new SKPaint())
{
paint.TextSize = textSize;
paint.IsAntialias = true;
paint.Color = color;
paint.IsStroke = false;
paint.Typeface = typeface;
if (orientation == Orientation.Vertical)
{
var y = point.Y;
switch (yPositionBehavior)
{
case YPositionBehavior.UpToElementHeight:
y -= bounds.Width;
break;
case YPositionBehavior.UpToElementMiddle:
y -= bounds.Width / 2;
break;
case YPositionBehavior.DownToElementMiddle:
y += bounds.Width / 2;
break;
case YPositionBehavior.None:
default:
break;
}
canvas.RotateDegrees(90);
canvas.Translate(y, -point.X + (bounds.Height / 2));
}
else
{
if (!allowOverflow)
{
if (bounds.Width > itemSize.Width)
{
text = text.Substring(0, Math.Min(3, text.Length));
paint.MeasureText(text, ref bounds);
}
if (bounds.Width > itemSize.Width)
{
text = text.Substring(0, Math.Min(1, text.Length));
paint.MeasureText(text, ref bounds);
}
}
var y = point.Y;
switch (yPositionBehavior)
{
case YPositionBehavior.UpToElementHeight:
y -= bounds.Height;
break;
case YPositionBehavior.UpToElementMiddle:
y -= bounds.Height / 2;
break;
case YPositionBehavior.DownToElementMiddle:
y += bounds.Height / 2;
break;
case YPositionBehavior.None:
default:
break;
}
canvas.Translate(point.X - (bounds.Width / 2), y);
}
canvas.DrawText(text, 0, 0, paint);
}
}
}
internal static void DrawLabel(SKCanvas canvas, Orientation orientation, YPositionBehavior yPositionBehavior, SKSize itemSize, SKPoint point, SKColor color, SKRect bounds, string text, float textSize, SKTypeface typeface, float margin)
{
using (new SKAutoCanvasRestore(canvas))
{
using (var paint = new SKPaint())
{
paint.TextSize = textSize;
paint.IsAntialias = true;
paint.Color = color;
paint.IsStroke = false;
paint.Typeface = typeface;
if (orientation == Orientation.Vertical)
{
var y = point.Y;
switch (yPositionBehavior)
{
case YPositionBehavior.UpToElementHeight:
y -= bounds.Width;
break;
case YPositionBehavior.UpToElementMiddle:
y -= bounds.Width / 2;
break;
case YPositionBehavior.DownToElementMiddle:
y += bounds.Width / 2;
break;
case YPositionBehavior.DownToElementHeight:
y += bounds.Width * 2;
break;
}
// TODO: this needs to clamp to inside the control (top/bottom edges)
canvas.RotateDegrees(90);
canvas.Translate(y, -point.X + (bounds.Height / 2));
}
else
{
// if no passed in size of the element we are drawing a label against, skip truncating the label
if (!itemSize.IsEmpty)
{
if (bounds.Width > itemSize.Width)
{
text = text.Substring(0, Math.Min(3, text.Length));
paint.MeasureText(text, ref bounds);
}
if (bounds.Width > itemSize.Width)
{
text = text.Substring(0, Math.Min(1, text.Length));
paint.MeasureText(text, ref bounds);
}
}
var x = point.X - bounds.Width / 2;
var y = point.Y;
switch (yPositionBehavior)
{
case YPositionBehavior.UpToElementHeight:
y -= bounds.Height;
break;
case YPositionBehavior.UpToElementMiddle:
y -= bounds.Height / 2;
break;
case YPositionBehavior.DownToElementMiddle:
y += bounds.Height / 2;
break;
case YPositionBehavior.DownToElementHeight:
y += bounds.Height * 2;
break;
}
// clamp to inside the control (left/right edges)
float clampRight = canvas.LocalClipBounds.Width - margin,
clampBottom = canvas.LocalClipBounds.Height - margin;
if (x < margin)
{
x = margin / 2;
}
if (x + bounds.Width > clampRight)
{
x = clampRight - bounds.Width;
}
// also on the y axis
if (y < margin)
{
y = margin;
}
if (y + bounds.Height > clampBottom)
{
y = clampBottom;
}
canvas.Translate(x, y);
}
canvas.DrawText(text, 0, 0, paint);
}
}
}
internal static YPositionBehavior ComputeEntryYPositionBehavior(
ChartEntry entry, YPositionBehavior defaultBehaviour)
{
return(entry.ValueLabelYPositionBehavior.GetValueOrDefault(defaultBehaviour));
}
