/// <summary>
/// Gets called whenever figures get added/removed from the figure collection.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OnFigureListEntriesChanged(object sender, NotifyCollectionChangedEventArgs e)
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
foreach (var o in e.NewItems)
{
FigureAccess access = new FigureAccess(o, OnFigureValueChanged, easeInValue: true);
FigureAccesses.Add(access);
var entryAnimation = new Animation((v) => { access.Entrance = (float)v; Redraw(); }, 0, 1, Easing.CubicInOut);
entryAnimation.Commit(this, access.EntranceHandle, _animationFramerate, 500u);
}
break;
case NotifyCollectionChangedAction.Move:
break;
case NotifyCollectionChangedAction.Remove:
foreach (var o in e.OldItems)
{
var access = FigureAccesses[o];
if (access == null)
{
continue;
}
if (this.AnimationIsRunning(access.EntranceHandle))
{
this.AbortAnimation(access.EntranceHandle);
}
access.Unsubscribe();
var leaveAnimation = new Animation((v) => { access.Entrance = (float)v; Redraw(); }, access.Entrance, 0, Easing.CubicInOut);
leaveAnimation.Commit(this, access.EntranceHandle, _animationFramerate, 500u, finished: (v, c) => { FigureAccesses.Remove(o); Redraw(force: true); });
}
break;
case NotifyCollectionChangedAction.Replace:
break;
case NotifyCollectionChangedAction.Reset:
break;
default:
break;
}
}
/// <summary>
/// Draw the describtions. So far, this is chart unspecific.
/// </summary>
protected void DrawValueLabels(SKCanvas canvas, int width, int height)
{
if (FigureAccesses == null || FigureAccesses.Count == 0)
{
return;
}
using (var describtionPaint = new SKPaint()
{
TextSize = 20f,
IsAntialias = IsAntiAliased,
Color = SKColors.Black,
IsStroke = false
})
{
//Calculating the maximum line height, that is then used for every line.
float maxDescribtionHeight = 0f;
foreach (FigureAccess fig in FigureAccesses)
{
if (!string.IsNullOrWhiteSpace(fig.Describtion))
{
var describtionBounds = new SKRect();
describtionPaint.MeasureText(fig.Describtion, ref describtionBounds);
maxDescribtionHeight = Math.Max(maxDescribtionHeight, describtionBounds.Height);
}
}
DrawDescribtionBackGround(canvas, width, height, maxDescribtionHeight, FigureAccesses.Count);
for (int i = 0; i < this.FigureAccesses.Count(); i++)
{
FigureAccess figure = FigureAccesses.ElementAt(i);
if (!string.IsNullOrEmpty(figure.Describtion))
{
var describtionBounds = new SKRect();
string text = figure.Describtion;
describtionPaint.MeasureText(text, ref describtionBounds);
maxDescribtionHeight = Math.Max(maxDescribtionHeight, describtionBounds.Height);
float xOffset = 0;
float yOffset = 0;
float xStep = 0;
float yStep = 0;
int adjustedIndex = i;
switch (DescribtionPosition)
{
case DescribtionArea.Default:
case DescribtionArea.LeftAndRight:
bool halfDone = i < (this.FigureAccesses.Count() + 1) / 2;
adjustedIndex = halfDone ? i : i - this.FigureAccesses.Count() % 2 - this.FigureAccesses.Count() / 2;
xOffset = halfDone ? width - Padding - DescribtionSpace + DescribtionPadding : +Padding + DescribtionPadding;
yOffset = halfDone ? Padding + DescribtionPadding : +Padding + DescribtionPadding + ((height - 2 * Padding) - Math.Min((this.FigureAccesses.Count() / 2) * maxDescribtionHeight * DescribtionSpacing + DescribtionPadding, height - 2 * Padding));
xStep = 0;
yStep = maxDescribtionHeight * DescribtionSpacing;
break;
case DescribtionArea.Right:
xOffset = width - Padding - DescribtionSpace + DescribtionPadding;
yOffset = Padding + DescribtionPadding;
xStep = 0;
yStep = maxDescribtionHeight * DescribtionSpacing;
break;
case DescribtionArea.Left:
xOffset = +Padding + DescribtionPadding;
yOffset = +Padding + DescribtionPadding;
xStep = 0;
yStep = maxDescribtionHeight * DescribtionSpacing;
break;
case DescribtionArea.Top:
break;
case DescribtionArea.Bottom:
break;
default:
break;
}
SKRect colorRect = SKRect.Create(
x: xOffset + xStep * adjustedIndex,
y: yOffset + yStep * adjustedIndex,
width: maxDescribtionHeight,
height: maxDescribtionHeight
);
using (var paint = new SKPaint()
{
IsAntialias = IsAntiAliased,
Color = figure.Color,
Style = SKPaintStyle.Fill
}) canvas.DrawRect(colorRect, paint);
canvas.DrawText(text,
x: colorRect.Right + 3f,
y: colorRect.Bottom,
paint: describtionPaint);
float valToShow = AnimateVisibleValues ? figure.AnimatedValue : figure.Value;
string valText = Math.Round(valToShow, FractionalDigits).ToString("n" + FractionalDigits);
canvas.DrawText(
text: valText,
x: colorRect.Right + describtionBounds.Width + 9f,
y: colorRect.Bottom,
paint: describtionPaint);
}
}
}
}
/// <summary>
/// Gets called when the value of a figure changes.
/// Animates the change of the value, visible through the chart.
/// </summary>
/// <param name="access">The figure access object of the figure whichs value changed.</param>
private void OnFigureValueChanged(FigureAccess access)
{
var valueAnimation = new Animation((v) => { access.ValueDeltaProportion = (float)v; Redraw(); }, access.ValueDeltaProportion, 1, Easing.CubicInOut);
valueAnimation.Commit(this, access.ValueAnimationHandle, _animationFramerate, 500u);
}
