protected override void DrawLabels(SKCanvas c, float pos, SKPoint anchor)
{
float labelRotationAngleDegrees = XAxis.LabelRotationAngle;
var centeringEnabled = XAxis.IsCenterAxisLabelsEnabled;
SKPoint[] positions = new SKPoint[XAxis.entryCount];
for (int i = 0; i < positions.Length; i++)
{
// only fill x values
if (centeringEnabled)
{
positions[i].Y = XAxis.centeredEntries[i];
}
else
{
positions[i].Y = XAxis.entries[i];
}
}
positions = Trasformer.PointValuesToPixel(positions);
for (int i = 0; i < positions.Length; i++)
{
float y = positions[i].Y;
if (ViewPortHandler.IsInBoundsY(y))
{
DrawLabel(c, XAxis.ValueFormatter.GetFormattedValue(XAxis.entries[i], XAxis), pos, y, anchor, labelRotationAngleDegrees);
}
}
}
/// <summary>
/// draws the x-labels on the specified y-position
/// </summary>
protected virtual void DrawLabels(SKCanvas c, float pos, SKPoint anchor)
{
float labelRotationAngleDegrees = XAxis.LabelRotationAngle;
var centeringEnabled = XAxis.IsCenterAxisLabelsEnabled;
SKPoint[] positions = new SKPoint[XAxis.entryCount];
for (int i = 0; i < positions.Length; i++)
{
// only fill x values
if (centeringEnabled)
{
positions[i].X = XAxis.centeredEntries[i];
}
else
{
positions[i].X = XAxis.entries[i];
}
}
positions = Trasformer.PointValuesToPixel(positions);
for (int i = 0; i < positions.Length; i++)
{
float x = positions[i].X;
if (ViewPortHandler.IsInBoundsX(x))
{
var label = XAxis.ValueFormatter.GetFormattedValue(XAxis.entries[i], XAxis);
if (XAxis.AvoidFirstLastClipping)
{
// avoid clipping of the last
if (i == XAxis.entryCount - 1 && XAxis.entryCount > 1)
{
float width = AxisLabelPaint.MeasureWidth(label);
if (width > ViewPortHandler.OffsetRight * 2 &&
x + width > ViewPortHandler.ChartWidth)
{
x -= width / 2;
}
// avoid clipping of the first
}
else if (i == 0)
{
float width = AxisLabelPaint.MeasureWidth(label);
x += width / 2;
}
}
DrawLabel(c, label, x, pos, anchor, labelRotationAngleDegrees);
}
}
}
/// <summary>
/// Transforms the values contained in the axis entries to screen pixels and returns them in form of a float array
/// of x- and y-coordinates.
/// </summary>
/// <returns></returns>
protected virtual SKPoint[] GetTransformedPositions()
{
if (TransformedPositionsBuffer.Length != YAxis.entryCount)
{
TransformedPositionsBuffer = new SKPoint[YAxis.entryCount];
}
SKPoint[] positions = TransformedPositionsBuffer;
for (int i = 0; i < positions.Length; i++)
{
// only fill y values, x values are not needed for y-labels
positions[i].Y = YAxis.entries[i];
}
return(Trasformer.PointValuesToPixel(positions));
}
public void RenderGridLines(SKCanvas c)
{
if (!this.XAxis.IsDrawGridLinesEnabled || !this.XAxis.IsEnabled)
{
return;
}
int clipRestoreCount = c.Save();
c.ClipRect(GetGridClippingRect());
if (RenderGridLinesBuffer.Length != Axis.entryCount)
{
RenderGridLinesBuffer = new SKPoint[XAxis.entryCount];
}
var positions = RenderGridLinesBuffer;
for (int i = 0; i < positions.Length; i++)
{
float entry = (float)Axis.entries[i];
positions[i] = new SKPoint(entry, entry);
}
positions = Trasformer.PointValuesToPixel(positions);
SetupGridPaint();
var gridLinePath = RenderGridLinesPath;
gridLinePath.Reset();
foreach (SKPoint pos in positions)
{
DrawGridLine(c, pos, gridLinePath);
}
c.RestoreToCount(clipRestoreCount);
}