protected void DrawHorizontalLabels(SKCanvas canvas, SKRect frame, SKRect chart)
{
if (HorizontalLabelMode == LabelMode.None)
{
return;
}
// Set y position where labels should be
var y = frame.Bottom + HorizontalTextSize + (HorizontalTextSize / 4);
using (var paint = new SKPaint
{
IsAntialias = true,
TextSize = HorizontalTextSize,
Color = HorizontalTextColor.ToSKColor(),
Typeface = FontTypeService.GetFontFamily(GetType().Assembly),
TextAlign = SKTextAlign.Center
})
{
// Draw min value
if (!string.IsNullOrEmpty(MinLabel))
{
paint.TextAlign = ChartType == ChartType.Bar || HorizontalLabelMode == LabelMode.All ? SKTextAlign.Center : SKTextAlign.Left;
canvas.DrawText(MinLabel, chart.Left, y, paint);
}
// Draw max value
if (!string.IsNullOrEmpty(MaxLabel) && MaxLabel != MinLabel)
{
paint.TextAlign = ChartType == ChartType.Bar || HorizontalLabelMode == LabelMode.All ? SKTextAlign.Center : SKTextAlign.Right;
canvas.DrawText(MaxLabel, chart.Right, y, paint);
}
paint.TextAlign = SKTextAlign.Center;
if (HorizontalLabelMode == LabelMode.All)
{
// Draw all labels
var items = ChartValuesDistinct;
if (items?.Any() != true)
{
return;
}
for (int i = 0; i < items.Count(); i++)
{
var entry = items.ElementAt(i);
var point = entry.Point;
if (string.IsNullOrEmpty(entry?.Label) || entry?.Label == MinLabel || entry?.Label == MaxLabel)
{
continue;
}
canvas.DrawText(entry.Label, point.X, y, paint);
}
}
// Draw horizontal unit
if (!string.IsNullOrEmpty(HorizontalUnit))
{
paint.TextAlign = ChartType == ChartType.Bar || HorizontalLabelMode == LabelMode.All ? SKTextAlign.Center : SKTextAlign.Right;
canvas.DrawText(HorizontalUnit, chart.Right, DisplayHorizontalValuesBySlider ? y + HorizontalTextSize + ChartRectMargin.Bottom : y + HorizontalTextSize, paint);
}
}
}
protected void DrawHorizontalLabel(ChartValueItem entry, SKCanvas canvas, SKRect frame, SKRect chart)
{
if (!DisplayHorizontalValuesBySlider)
{
return;
}
// Draws the horizontal value the slider is on //
if (string.IsNullOrEmpty(entry?.Label))
{
return;
}
float x = chart.GetInsideXValue(TouchedPoint.X);
if (ChartType == ChartType.Bar)
{
x = entry.Point.X;
}
// Draws background
using (var boundPaint = new SKPaint
{
Color = SliderDetailColor.ToSKColor(),
StrokeCap = SKStrokeCap.Round,
Style = SKPaintStyle.StrokeAndFill,
StrokeWidth = SliderWidth
})
{
var bounds = boundPaint.GetBounds(
entry.Label,
x,
frame.Bottom + HorizontalTextSize + (HorizontalTextSize / 4),
padding: InternalSliderDetailPadding);
if (bounds.Right > frame.Right)
{
bounds.Left = frame.Right - bounds.Width + SliderWidth;
bounds.Right = frame.Right + SliderWidth;
}
else if (bounds.Left < frame.Left)
{
bounds.Right = frame.Left + bounds.Width - SliderWidth;
bounds.Left = frame.Left - SliderWidth;
}
canvas.DrawRoundRect(new SKRoundRect(bounds, SliderDetailCornerRadius), boundPaint);
// Draws text
using (var textPaint = new SKPaint
{
IsAntialias = true,
TextSize = HorizontalTextSize,
Color = SliderDetailTextColor.ToSKColor(),
Typeface = FontTypeService.GetFontFamily(GetType().Assembly, isBold: true),
TextAlign = SKTextAlign.Center,
FakeBoldText = true
})
{
canvas.DrawText(entry.Label, bounds.MidX, bounds.MidY + (bounds.Height / 4), textPaint);
}
}
}
protected void DrawVerticalLabels(SKCanvas canvas, SKRect frame, SKRect chart)
{
if (VerticalLabelMode == LabelMode.None)
{
return;
}
// Calculates maximum value depending on chart height
var maximumValue = chart.Height * (MaxValue / chart.Height);
float left = 0;
// Calculates where left is for all vertical labels
switch (VerticalLabelAlignment)
{
case TextAlignment.Start:
left = frame.Left - ChartRectMargin.Left;
break;
case TextAlignment.Center:
left = ChartRectMargin.Left / 2;
break;
case TextAlignment.End:
left = frame.Left + (ChartRectMargin.Left / 2);
break;
}
using (var textPaint = new SKPaint
{
IsAntialias = true,
TextSize = VerticalTextSize,
Color = VerticalTextColor.ToSKColor(),
Typeface = FontTypeService.GetFontFamily(GetType().Assembly),
TextAlign = VerticalLabelAlignment == TextAlignment.Start ? SKTextAlign.Right : SKTextAlign.Left
})
{
if (!string.IsNullOrEmpty(VerticalUnit))
{
// Draws vertical unit and maximum value
canvas.DrawText(VerticalUnit, new SKPoint(left, (0f).GetVerticalAlignment(VerticalTextSize, TextAlignment.End)), textPaint);
}
// Draws maximum value
canvas.DrawText(maximumValue.ToRoundedString(), new SKPoint(left, frame.Top.GetVerticalAlignment(VerticalTextSize, TextAlignment.End)), textPaint);
// Draws bottom value
canvas.DrawText("0", new SKPoint(left, frame.Bottom), textPaint);
if (VerticalLabelMode == LabelMode.StartEnd)
{
return;
}
// Draws maximum value
canvas.DrawText(maximumValue.ToString(), new SKPoint(left, frame.Top.GetVerticalAlignment(VerticalTextSize, TextAlignment.End)), textPaint);
// Draws bottom value
canvas.DrawText("0", new SKPoint(left, frame.Bottom), textPaint);
if (VerticalLabelMode == LabelMode.StartEnd)
{
return;
}
// Draws middle value
canvas.DrawText((maximumValue / 2).ToString(), new SKPoint(left, frame.MidY.GetVerticalAlignment(VerticalTextSize, TextAlignment.Center)), textPaint);
if (VerticalLabelMode == LabelMode.StartCenterEnd)
{
return;
}
// Draws rest of values
canvas.DrawText((maximumValue * .25).ToString(), new SKPoint(left, ((frame.Height * .75f) + frame.Top).GetVerticalAlignment(VerticalTextSize, TextAlignment.Center)), textPaint);
canvas.DrawText((maximumValue * .75).ToString(), new SKPoint(left, ((frame.Height * .25f) + frame.Top).GetVerticalAlignment(VerticalTextSize, TextAlignment.Center)), textPaint);
}
}
