protected void ShowSliderValuesPosition(SKCanvas canvas, SKRect frame)
{
if (!IsSliderVisible)
{
return;
}
var valueItems = ChartEntries.GetChartValueItemFromX(TouchedPoint.X, frame, MaxItems);
if (valueItems?.Any() != true)
{
return;
}
int index = 0;
foreach (var item in valueItems)
{
canvas.DrawSliderCircle(item.ChartValueItem.Point.X, item.ChartValueItem.Point.Y, item.Color, this.SliderPointSize);
string text = Math.Round(double.Parse(item.ChartValueItem.Value.ToString()), 0, MidpointRounding.AwayFromZero).ToString() + " " + this.VerticalUnit;
canvas.DrawSliderValue(
text,
frame.GetInsideXValue(TouchedPoint.X),
frame.Top,
SliderDetailTextSize,
SKColors.White,
item.Color,
SliderDetailPadding,
SliderDetailMargin,
MaxValue + " " + this.VerticalUnit,
valueItems.Count,
index,
SliderDetailOrientation,
frame,
item.Parent?.UseDashedEffect == true);
index++;
}
}
protected void ShowExactSliderValuesPosition(SKCanvas canvas, SKRect frame)
{
if (!IsSliderVisible)
{
return;
}
var valueItems = ChartEntries.GetChartValueItemFromX(TouchedPoint.X, frame, MaxItems);
if (valueItems?.Any() != true)
{
return;
}
int index = 0;
foreach (var item in valueItems)
{
var chartEntry = item.ChartValueItem;
var nextChartEntry = item.NextChartValueItem;
float y, points;
if (nextChartEntry != null)
{
// Difference in value
var diffVal = nextChartEntry.Value - chartEntry.Value;
// Difference in Y position
var diffY = nextChartEntry.Point.Y - chartEntry.Point.Y;
// Difference in X position
var diffX = nextChartEntry.Point.X - chartEntry.Point.X;
var yValue = diffVal / diffY;
var xValue = diffVal / diffX;
// Current X position over first item
var x = TouchedPoint.X - chartEntry.Point.X;
points = x * xValue;
y = (points / yValue) + chartEntry.Point.Y;
}
else
{
y = chartEntry.Point.Y;
points = chartEntry.Value;
}
canvas.DrawSliderCircle(frame.GetInsideXValue(TouchedPoint.X), y, item.Color, SliderPointSize);
float currentVal = 0;
if (nextChartEntry != null)
{
try
{
currentVal = chartEntry.Value + (int)Math.Round(decimal.Parse(points.ToString()), 0, MidpointRounding.AwayFromZero);
}
catch (Exception ex)
{
ex.Print();
}
if (TouchedPoint.X == chartEntry.Point.X)
{
currentVal = chartEntry.Value;
}
else if (TouchedPoint.X == nextChartEntry?.Point.X)
{
currentVal = nextChartEntry.Value;
}
}
else
{
currentVal = chartEntry.Value;
}
string text = currentVal.ToString() + " " + this.VerticalUnit;
canvas.DrawSliderValue(
text,
frame.GetInsideXValue(TouchedPoint.X),
frame.Top,
SliderDetailTextSize,
SKColors.White,
item.Color,
SliderDetailPadding,
SliderDetailMargin,
MaxValue + " " + VerticalUnit,
valueItems.Count,
index,
SliderDetailOrientation,
frame,
item.Parent?.UseDashedEffect == true);
index++;
}
}
private void DrawBars(SKCanvas canvas, SKRect frame, SKRect chart)
{
var itemWidth = (MaxItems >= 12 ? chart.GetItemWidth(MaxItems) : chart.GetItemWidth(12)) / 2;
var count = ChartEntries.Count(x => x.IsVisible);
// Regular bar width
var barWidth = (itemWidth / count) - 10;
// Selected bar width
var selectedValueItems = ChartEntries.GetChartValueItemFromX(chart.GetInsideXValue(TouchedPoint.X), chart, MaxItems, false);
var selectedTags = selectedValueItems?.Select(x => x.ChartValueItem.Tag);
int index = 0;
foreach (var item in ChartEntries.Where(x => x.IsVisible))
{
foreach (var valueItem in item.Items.Where(x => selectedTags?.Contains(x.Tag) != true))
{
// Draw not selected bars //
canvas.DrawBar(
valueItem.Point.X,
valueItem.Point.Y,
chart.Bottom,
barWidth,
BarMargin,
count,
index,
IsSliderVisible ? item.Color.ToSKColor().AsTransparency() : item.Color.ToSKColor(),
item.UseDashedEffect);
}
index++;
}
if (!IsSliderVisible)
{
return;
}
count = selectedValueItems?.Count() ?? 1;
barWidth = (itemWidth / selectedValueItems?.Count() ?? 1) + 10;
index = 0;
foreach (var item in ChartEntries.Where(x => x.IsVisible))
{
var valueItems = item.Items.Where(x => selectedTags?.Contains(x.Tag) == true);
if (valueItems?.Any() != true)
{
continue;
}
foreach (var valueItem in valueItems)
{
canvas.DrawBar(
valueItem.Point.X,
valueItem.Point.Y,
chart.Bottom,
barWidth,
BarMargin,
count,
index,
item.Color.ToSKColor(),
item.UseDashedEffect);
string text = Math.Round(double.Parse(valueItem.Value.ToString()), 0, MidpointRounding.AwayFromZero).ToString() + " " + this.VerticalUnit;
canvas.DrawSliderValue(
text,
frame.GetInsideXValue(valueItem.Point.X),
frame.Top,
SliderDetailTextSize,
SKColors.White,
item.Color.ToSKColor(),
SliderDetailPadding,
SliderDetailMargin,
MaxValue + " " + this.VerticalUnit,
selectedValueItems.Count,
index,
SliderDetailOrientation,
frame,
item.UseDashedEffect);
}
index++;
}
float hintX = selectedValueItems?.FirstOrDefault()?.ChartValueItem?.Point.X ?? 0;
float hintY = selectedValueItems?.OrderByDescending(x => x.ChartValueItem.Point.Y)?.FirstOrDefault()?.ChartValueItem?.Point.Y ?? 0;
if (hintX != 0 && hintY != 0)
{
DrawDragHintGraphic(
canvas,
hintX,
hintY + ((frame.Bottom - hintY) / 2),
(barWidth * count),
frame);
}
}