/// <summary>
/// constructor
/// </summary>
/// <param name="x">the x-value of the highlighted value</param>
/// <param name="y">the y-value of the highlighted value</param>
/// <param name="xPx"></param>
/// <param name="yPx"></param>
/// <param name="dataSetIndex"> the index of the DataSet the highlighted value belongs to</param>
/// <param name="axis"></param>
public Highlight(float x, float y, float xPx, float yPx, int dataSetIndex, YAxisDependency axis)
{
X = x;
Y = y;
XPx = xPx;
YPx = yPx;
DataSetIndex = dataSetIndex;
Axis = axis;
}
/// <summary>
/// draws the y-axis labels to the screen
/// </summary>
public virtual void RenderAxisLabels(SKCanvas c)
{
if (!YAxis.IsEnabled || !YAxis.IsDrawLabelsEnabled)
{
return;
}
SKPoint[] positions = GetTransformedPositions();
AxisLabelPaint.Typeface = YAxis.Typeface;
AxisLabelPaint.TextSize = YAxis.TextSize;
AxisLabelPaint.Color = YAxis.TextColor;
float xoffset = YAxis.XOffset;
float yoffset = AxisLabelPaint.MeasureHeight("A") / 2.5f + YAxis.YOffset;
YAxisDependency dependency = YAxis.AxisDependency;
YAxis.YAxisLabelPosition labelPosition = YAxis.Position;
float xPos;
if (dependency == YAxisDependency.Left)
{
if (labelPosition == YAxis.YAxisLabelPosition.OutSideChart)
{
AxisLabelPaint.TextAlign = SKTextAlign.Right;
xPos = ViewPortHandler.OffsetLeft - xoffset;
}
else
{
AxisLabelPaint.TextAlign = SKTextAlign.Left;
xPos = ViewPortHandler.OffsetLeft + xoffset;
}
}
else
{
if (labelPosition == YAxis.YAxisLabelPosition.OutSideChart)
{
AxisLabelPaint.TextAlign = SKTextAlign.Left;
xPos = ViewPortHandler.ContentRight + xoffset;
}
else
{
AxisLabelPaint.TextAlign = SKTextAlign.Right;
xPos = ViewPortHandler.ContentRight - xoffset;
}
}
DrawYLabels(c, xPos, positions, yoffset);
}
public override void RenderAxisLabels(SKCanvas c)
{
if (!YAxis.IsEnabled || !YAxis.IsDrawLabelsEnabled)
{
return;
}
SKPoint[] positions = GetTransformedPositions();
AxisLabelPaint.Typeface = YAxis.Typeface;
AxisLabelPaint.TextSize = YAxis.TextSize;
AxisLabelPaint.Color = YAxis.TextColor;
AxisLabelPaint.TextAlign = SKTextAlign.Center;
float baseYOffset = 2.5f.DpToPixel();
float textHeight = AxisLabelPaint.MeasureHeight("Q");
YAxisDependency dependency = YAxis.AxisDependency;
YAxis.YAxisLabelPosition labelPosition = YAxis.Position;
float yPos;
if (dependency == YAxisDependency.Left)
{
if (labelPosition == YAxis.YAxisLabelPosition.OutSideChart)
{
yPos = ViewPortHandler.ContentTop - baseYOffset;
}
else
{
yPos = ViewPortHandler.ContentTop - baseYOffset;
}
}
else
{
if (labelPosition == YAxis.YAxisLabelPosition.OutSideChart)
{
yPos = ViewPortHandler.ContentBottom + textHeight + baseYOffset;
}
else
{
yPos = ViewPortHandler.ContentBottom + textHeight + baseYOffset;
}
}
DrawYLabels(c, yPos, positions, YAxis.YOffset);
}
/// <summary>
/// Returns the Highlight of the DataSet that contains the closest value on the
/// y-axis.
/// </summary>
/// <param name="closestValues">contains two Highlight objects per DataSet closest to the selected x-position(determined by
/// rounding up an down)</param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="axis"> the closest axis</param>
/// <param name="minSelectionDistance"></param>
/// <returns></returns>
public Highlight GetClosestHighlightByPixel(IList <Highlight> closestValues, float x, float y,
YAxisDependency axis, float minSelectionDistance)
{
Highlight closest = null;
float distance = minSelectionDistance;
for (int i = 0; i < closestValues.Count; i++)
{
Highlight high = closestValues[i];
if (high.Axis == axis)
{
float cDistance = GetDistance(x, y, high.XPx, high.YPx);
if (cDistance < distance)
{
closest = high;
distance = cDistance;
}
}
}
return(closest);
}
/// <summary>
/// Constructor, only used for stacked-barchart.
/// </summary>
/// <param name="x">the index of the highlighted value on the x-axis</param>
/// <param name="y">the y-value of the highlighted value</param>
/// <param name="xPx"></param>
/// <param name="yPx"></param>
/// <param name="dataSetIndex">the index of the DataSet the highlighted value belongs to</param>
/// <param name="stackIndex">references which value of a stacked-bar entry has been selected</param>
/// <param name="axis"></param>
public Highlight(float x, float y, float xPx, float yPx, int dataSetIndex, int stackIndex, YAxisDependency axis) : this(x, y, xPx, yPx, dataSetIndex, axis)
{
StackIndex = stackIndex;
}
public override Point GetPosition(Entry e, YAxisDependency axis)
{
if (e == null)
{
return(default);
/// <summary>
/// Returns the minimum distance from a touch value (in pixels) to the
/// closest value(in pixels) that is displayed in the chart.
/// </summary>
protected float GetMinimumDistance(IList <Highlight> closestValues, float pos, YAxisDependency axis)
{
float distance = float.MaxValue;
for (int i = 0; i < closestValues.Count; i++)
{
Highlight high = closestValues[i];
if (high.Axis == axis)
{
float tempDistance = Math.Abs(GetHighlightPos(high) - pos);
if (tempDistance < distance)
{
distance = tempDistance;
}
}
}
return(distance);
}