protected override void DrawNullPoint(ChartSerie serie, SKCanvas canvas)
{
//Some of the drawing algorithms index into pointsPerSerie
var point = new SKPoint(float.MinValue, float.MinValue);
pointsPerSerie[serie].Add(point);
}
/// <inheritdoc/>
protected override void DrawBar(ChartSerie serie, SKCanvas canvas, float headerHeight, float itemX, SKSize itemSize, SKSize barSize, float origin, float barX, float barY, SKColor color)
{
//Drawing entry point at center of the item (label) part
var point = new SKPoint(itemX, barY);
pointsPerSerie[serie].Add(point);
}
/// <inheritdoc />
protected override void DrawBar(ChartSerie serie, SKCanvas canvas, float headerHeight, float itemX, SKSize itemSize, SKSize barSize, float origin, float barX, float barY, SKColor color)
{
if (PointMode != PointMode.None)
{
var point = new SKPoint(barX - (itemSize.Width / 2) + (barSize.Width / 2), barY);
canvas.DrawPoint(point, color, PointSize, PointMode);
}
}
/// <inheritdoc />
protected override void DrawBar(ChartSerie serie, SKCanvas canvas, float headerHeight, float itemX, SKSize itemSize, SKSize barSize, float origin, float barX, float barY, SKColor color)
{
using (var paint = new SKPaint
{
Style = SKPaintStyle.Fill,
Color = color,
})
{
(SKPoint location, SKSize size) = GetBarDrawingProperties(headerHeight, itemSize, barSize, origin, barX, barY);
var rect = SKRect.Create(location, size);
canvas.DrawRect(rect, paint);
}
}
private void DrawLineArea(SKCanvas canvas, ChartSerie serie, SKPoint[] points, SKSize itemSize, float origin)
{
if (LineAreaAlpha > 0 && points.Length > 1)
{
using (var paint = new SKPaint
{
Style = SKPaintStyle.Fill,
Color = SKColors.White,
IsAntialias = true,
})
{
using (var shaderX = CreateXGradient(points, serie.Entries, serie.Color, (byte)(LineAreaAlpha * AnimationProgress)))
using (var shaderY = CreateYGradient(points, (byte)(LineAreaAlpha * AnimationProgress)))
{
paint.Shader = EnableYFadeOutGradient ? SKShader.CreateCompose(shaderY, shaderX, SKBlendMode.SrcOut) : shaderX;
var path = new SKPath();
path.MoveTo(points.First().X, origin);
path.LineTo(points.First());
var last = (LineMode == LineMode.Spline) ? points.Length - 1 : points.Length;
for (int i = 0; i < last; i++)
{
if (LineMode == LineMode.Spline)
{
var cubicInfo = CalculateCubicInfo(points, i, itemSize);
path.CubicTo(cubicInfo.control, cubicInfo.nextControl, cubicInfo.nextPoint);
}
else if (LineMode == LineMode.Straight)
{
path.LineTo(points[i]);
}
}
path.LineTo(points.Last().X, origin);
path.Close();
canvas.DrawPath(path, paint);
}
}
}
}
/// <inheritdoc />
protected override void DrawBar(ChartSerie serie, SKCanvas canvas, float headerHeight, float itemX, SKSize itemSize, SKSize barSize, float origin, float barX, float barY, SKColor color)
{
using (var paint = new SKPaint
{
Style = SKPaintStyle.Fill,
Color = color,
})
{
var x = barX - (itemSize.Width / 2);
var y = Math.Min(origin, barY);
var height = Math.Abs(origin - barY);
if (height < MinBarHeight)
{
height = MinBarHeight;
if (y + height > Margin + itemSize.Height)
{
y = headerHeight + itemSize.Height - height;
}
}
var rect = SKRect.Create(x, y, barSize.Width, height);
canvas.DrawRect(rect, paint);
}
}
private void DrawLineArea(SKCanvas canvas, ChartSerie serie, SKPoint[] points, SKSize itemSize, float origin)
{
if (LineAreaAlpha > 0 && points.Length > 1)
{
using (var paint = new SKPaint
{
Style = SKPaintStyle.Fill,
Color = SKColors.White,
IsAntialias = true,
})
{
using (var shaderX = CreateXGradient(points, serie.Entries, serie.Color, (byte)(LineAreaAlpha * AnimationProgress)))
using (var shaderY = CreateYGradient(points, (byte)(LineAreaAlpha * AnimationProgress)))
{
paint.Shader = EnableYFadeOutGradient ? SKShader.CreateCompose(shaderY, shaderX, SKBlendMode.SrcOut) : shaderX;
var path = new SKPath();
var isFirst = true;
var entries = serie.Entries;
var lineMode = LineMode;
var last = (lineMode == LineMode.Spline) ? points.Length - 1 : points.Length;
SKPoint lastPoint = points.First();
for (int i = 0; i < last; i++)
{
if (!entries.ElementAt(i).Value.HasValue)
{
continue;
}
if (isFirst)
{
path.MoveTo(points[i].X, origin);
path.LineTo(points[i]);
isFirst = false;
}
if (lineMode == LineMode.Spline)
{
int next = i + 1;
while (next < last && !entries.ElementAt(next).Value.HasValue)
{
next++;
}
if (next == last && !entries.ElementAt(next).Value.HasValue)
{
lastPoint = points[i];
break;
}
var cubicInfo = CalculateCubicInfo(points, i, next, itemSize);
path.CubicTo(cubicInfo.control, cubicInfo.nextControl, cubicInfo.nextPoint);
lastPoint = cubicInfo.nextPoint;
}
else if (lineMode == LineMode.Straight)
{
path.LineTo(points[i]);
lastPoint = points[i];
}
}
path.LineTo(lastPoint.X, origin);
path.Close();
canvas.DrawPath(path, paint);
}
}
}
}