/// <summary>
/// Fills the cache with bitmaps for the given dataset.
/// </summary>
protected void Fill(DataSetImageCache cache, ILineDataSet set, bool drawCircleHole, bool drawTransparentCircleHole)
{
int colorCount = set.CircleColorCount;
float circleRadius = set.CircleRadius;
float circleHoleRadius = set.CircleHoleRadius;
var circleBitmaps = cache.CircleBitmaps;
var circlePath = cache.CirclePathBuffer;
for (int i = 0; i < colorCount; i++)
{
var circleBitmap = new SKBitmap((int)(circleRadius * 2.1), (int)(circleRadius * 2.1));
var canvas = new SKCanvas(circleBitmap);
circleBitmaps[i] = circleBitmap;
RenderPaint.Color = set.GetCircleColor(i);
if (drawTransparentCircleHole)
{
// Begin path for circle with hole
circlePath.Reset();
circlePath.AddCircle(
circleRadius,
circleRadius,
circleRadius,
SKPathDirection.Clockwise);
// Cut hole in path
circlePath.AddCircle(
circleRadius,
circleRadius,
circleHoleRadius,
SKPathDirection.CounterClockwise);
// Fill in-between
canvas.DrawPath(circlePath, RenderPaint);
}
else
{
canvas.DrawCircle(
circleRadius,
circleRadius,
circleRadius,
RenderPaint);
if (drawCircleHole)
{
canvas.DrawCircle(
circleRadius,
circleRadius,
circleHoleRadius,
CirclePaintInner);
}
}
}
}
protected void DrawCircles(SKCanvas c)
{
RenderPaint.Style = SKPaintStyle.Fill;
float phaseY = Animator.PhaseY;
var dataSets = ((Interfaces.DataProvider.ILineChartProvider)Chart).Data.DataSets;
for (int i = 0; i < dataSets.Count; i++)
{
ILineDataSet dataSet = dataSets[i];
if (!dataSet.IsVisible || !dataSet.IsDrawCirclesEnabled ||
dataSet.EntryCount == 0)
{
continue;
}
CirclePaintInner.Color = dataSet.CircleHoleColor;
Transformer trans = Chart.GetTransformer(dataSet.AxisDependency);
XBounds.Set(Chart, dataSet, Animator);
float circleRadius = dataSet.CircleRadius;
float circleHoleRadius = dataSet.CircleHoleRadius;
var drawCircleHole = dataSet.IsDrawCircleHoleEnabled &&
circleHoleRadius <circleRadius &&
circleHoleRadius> 0.0f;
var drawTransparentCircleHole = drawCircleHole &&
dataSet.CircleHoleColor == SKColors.Empty;
if (imageCaches.TryGetValue(dataSet, out DataSetImageCache imageCache) == false)
{
imageCache = new DataSetImageCache();
imageCaches.Add(dataSet, imageCache);
}
// only fill the cache with new bitmaps if a change is required
if (imageCache.Init(dataSet))
{
Fill(imageCache, dataSet, drawCircleHole, drawTransparentCircleHole);
}
int boundsRangeCount = XBounds.Range + XBounds.Min;
for (int j = XBounds.Min; j <= boundsRangeCount; j++)
{
Entry e = ((IDataSet)dataSet)[j];
if (e == null)
{
break;
}
var pt = trans.PointValueToPixel(e.X, e.Y * phaseY);
if (!ViewPortHandler.IsInBoundsRight(pt.X))
{
break;
}
if (!ViewPortHandler.IsInBoundsLeft(pt.X) ||
!ViewPortHandler.IsInBoundsY(pt.Y))
{
continue;
}
var circleBitmap = imageCache.GetBitmap(j);
if (circleBitmap != null)
{
c.DrawBitmap(circleBitmap, pt.X - circleRadius, pt.Y - circleRadius, null);
}
}
}
}