/// <summary>
/// Raises the <see cref="ChartElement.Updated"/> event.
/// </summary>
/// <remarks>
/// <strong>Notes to Inheritors:</strong> When overriding <see cref="OnUpdate"/> in a
/// derived class, be sure to call the base class's <see cref="OnUpdate"/> method so that
/// the base class <see cref="Chart"/> can update the data source if required.
/// </remarks>
protected override void OnUpdate()
{
base.OnUpdate(); // Updates the data source, if required.
// Cleanup
_lineRenderer.Clear();
_areaRenderer.Clear();
Debug.Assert(Canvas.Children.Count == 0, "Canvas should be cleared in base class.");
Canvas.Children.Add(_areaPath);
Canvas.Children.Add(_linePath);
if (Data != null && Data.Count != 0)
{
// Clip filled area and lines to the chart area.
Rect chartArea = ChartPanel.GetChartAreaBounds(XAxis, YAxis);
// Allow line to draw on chart axes.
Rect lineClipRect = new Rect(chartArea.Left - 2, chartArea.Top - 2, chartArea.Width + 4, chartArea.Height + 4);
LineClipGeometry = new RectangleGeometry { Rect = lineClipRect };
// Keep area inside the chart area.
Rect areaClipRect = chartArea;
AreaClipGeometry = new RectangleGeometry { Rect = areaClipRect };
FindVisibleDataPoints();
CachePositions();
OnUpdateLines(_startIndex, _endIndexExclusive, _xPositions, _basePositions, _yPositions);
UpdateMarkers();
#else
switch (RenderMode)
{
case ChartRenderMode.Quality:
// Update lines and markers immediately.
OnUpdateLines(_startIndex, _endIndexExclusive, _xPositions, _basePositions, _yPositions);
UpdateMarkers();
break;
case ChartRenderMode.Performance:
// Immediately update lines.
OnUpdateLines(_startIndex, _endIndexExclusive, _xPositions, _basePositions, _yPositions);
// Temporarily disable bitmap cache and anti-aliasing.
// Update markers when application is idle.
if (!_updatePending)
{
_updatePending = true;
ClearCacheMode();
ClearEdgeMode();
ChartHelper.Defer(Dispatcher, () =>
{
if (_updatePending)
{
_updatePending = false;
UpdateMarkers();
RestoreCacheMode();
RestoreEdgeMode();
}
});
}
break;
case ChartRenderMode.DoNotRender:
// Do nothing.
break;
}
}
}
/// <inheritdoc/>
protected override void OnUpdate()
{
base.OnUpdate();
Debug.Assert(Canvas.Children.Count == 0, "Canvas should be cleared in base class.");
if (Data == null || Data.Count == 0 || DataPointTemplate == null)
{
// A relevant property is not set.
return;
}
// Fetch dependency properties. (Accessing dependency properties is expensive.)
Axis xAxis = XAxis;
Axis yAxis = YAxis;
AxisScale xScale = xAxis.Scale;
AxisScale yScale = yAxis.Scale;
double centerX = CenterX;
double centerY = CenterY;
double hole = Hole;
double outerRadius = Radius;
Thickness padding = Padding;
if (hole < 0 || hole > 1)
throw new ChartException("Pie chart has invalid hole size. The hole size is relative to the outer radius and must be in the range [0, 1].");
if (outerRadius < 0)
throw new ChartException("Pie chart has invalid radius. The radius must be a equal to or greater than 0.");
// Determine available space.
double left = xAxis.GetPosition(xScale.Min);
double right = xAxis.GetPosition(xScale.Max);
if (left > right)
{
// Scale is reversed.
ChartHelper.Swap(ref left, ref right);
}
double top = yAxis.GetPosition(yScale.Max);
double bottom = yAxis.GetPosition(yScale.Min);
if (top > bottom)
{
// Scale is reversed.
ChartHelper.Swap(ref top, ref bottom);
}
// Apply padding.
left += padding.Left;
right -= padding.Right;
top += padding.Top;
bottom -= padding.Bottom;
if (Numeric.IsNaN(centerX))
{
// Center pie chart horizontally.
centerX = (left + right) / 2;
}
else
{
centerX = xAxis.OriginX + centerX * xAxis.Length;
}
if (Numeric.IsNaN(centerY))
{
// Center pie chart vertically.
centerY = (top + bottom) / 2;
}
else
{
centerY = yAxis.OriginY - (1.0 - centerY) * yAxis.Length;
}
if (Numeric.IsNaN(outerRadius))
{
// Fit pie chart into available space.
double radiusLeft = centerX - left;
double radiusRight = right - centerX;
double radiusTop = centerY - top;
double radiusBottom = bottom - centerY;
outerRadius = radiusLeft;
if (outerRadius > radiusRight)
outerRadius = radiusRight;
if (outerRadius > radiusTop)
outerRadius = radiusTop;
if (outerRadius > radiusBottom)
outerRadius = radiusBottom;
}
if (Numeric.IsNaN(hole))
hole = 0;
double innerRadius = hole * outerRadius;
ActualHoleRadius = innerRadius;
// Draw pie chart inside chart panel.
DrawPieChart(Canvas, centerX, centerY, innerRadius, outerRadius, BrushSelector, false);
// Update legend symbols inside legends.
// Use a fixed innerRadius
innerRadius = (Hole > 0) ? 2 : 0;
foreach (var legendSymbol in _legendSymbols)
DrawPieChart(legendSymbol, 8, 8, innerRadius, 8, BrushSelector, true);
}
private void GetBrushes(double paletteIndex, out Brush strokeBrush, out Brush fillBrush)
{
Axis xAxis = XAxis;
Axis yAxis = YAxis;
strokeBrush = null;
fillBrush = null;
if (FillMode == BarFillMode.Solid)
{
// Solid:
// Get a solid color brush for fill and stroke.
if (FillPalette != null && FillPalette.Count > 0)
fillBrush = new SolidColorBrush(FillPalette.GetColor(paletteIndex));
if (StrokePalette != null && StrokePalette.Count > 0)
strokeBrush = new SolidColorBrush(StrokePalette.GetColor(paletteIndex));
}
else
{
// Gradient:
// We draw from 0 upwards or from a negative value upwards to 0.
double lower = Math.Min(0, paletteIndex);
double higher = Math.Max(0, paletteIndex);
// Define end point for gradient direction.
Point startPoint;
Point endPoint;
if (PaletteIndex == PaletteIndex.XValue)
{
// Horizontal
startPoint = new Point(0, 0);
endPoint = new Point(1, 0);
if (xAxis != null && xAxis.Scale != null && xAxis.Scale.Reversed)
ChartHelper.Swap(ref startPoint, ref endPoint);
}
else
{
// Vertical
startPoint = new Point(0, 1);
endPoint = new Point(0, 0);
if (yAxis != null && yAxis.Scale != null && yAxis.Scale.Reversed)
ChartHelper.Swap(ref startPoint, ref endPoint);
}
// Get brush for fill and stroke.
if (FillPalette != null && FillPalette.Count > 0)
{
fillBrush = new LinearGradientBrush
{
GradientStops = FillPalette.GetGradient(lower, higher),
StartPoint = startPoint,
EndPoint = endPoint,
ColorInterpolationMode = FillPalette.ColorInterpolationMode
};
}
if (StrokePalette != null && StrokePalette.Count > 0)
{
strokeBrush = new LinearGradientBrush
{
GradientStops = StrokePalette.GetGradient(lower, higher),
StartPoint = startPoint,
EndPoint = endPoint,
ColorInterpolationMode = StrokePalette.ColorInterpolationMode
};
}
}
}
protected override Size ArrangeOverride(Size finalSize)
{
// Ensure that all axes are up to date.
foreach (Axis axis in _monitoredAxes)
axis.Update();
UIElementCollection children = Children;
for (int i = 0; i < children.Count; ++i)
{
UIElement child = children[i];
if (child == null)
continue;
// Get the child or one of its descendants that needs to be positioned.
DependencyObject elementThatRequiresArrange = GetElementThatRequiresArrange(child);
if (elementThatRequiresArrange == null)
{
// This child ignores the attached properties (X1, Y1, X2, Y2).
Rect childBounds = new Rect(new Point(), finalSize);
// Arrange element,
child.Arrange(childBounds);
// Clip to chart area.
if (GetClipToChartArea(child))
ClipElementToChartArea(child, childBounds);
}
else
{
// Determine alignment.
HorizontalAlignment horizontalAlignment = HorizontalAlignment.Left;
VerticalAlignment verticalAlignment = VerticalAlignment.Top;
if (elementThatRequiresArrange is FrameworkElement)
{
FrameworkElement frameworkElement = (FrameworkElement)elementThatRequiresArrange;
horizontalAlignment = frameworkElement.HorizontalAlignment;
verticalAlignment = frameworkElement.VerticalAlignment;
}
// Get associated axes.
Axis xAxis = GetXAxis(elementThatRequiresArrange);
Axis yAxis = GetYAxis(elementThatRequiresArrange);
// Check whether we have to position the element relative to a point (X1, Y1)
// or inside a region (X1, Y1) - (X2, Y2).
// Convert positions given in data values to pixel positions.
double x1 = xAxis.GetPosition(GetX1(elementThatRequiresArrange));
double y1 = yAxis.GetPosition(GetY1(elementThatRequiresArrange));
double x2 = xAxis.GetPosition(GetX2(elementThatRequiresArrange));
double y2 = yAxis.GetPosition(GetY2(elementThatRequiresArrange));
bool isX1Valid = Numeric.IsFinite(x1);
bool isY1Valid = Numeric.IsFinite(y1);
bool isX2Valid = Numeric.IsFinite(x2);
bool isY2Valid = Numeric.IsFinite(y2);
double availableWidth = Double.PositiveInfinity;
double availableHeight = Double.PositiveInfinity;
if (!isX1Valid && !isX2Valid)
{
// No coordinates set. Use 0 and 'left' alignment.
x1 = 0;
x2 = Double.NaN;
horizontalAlignment = HorizontalAlignment.Left;
}
else if (!isX1Valid)
{
// Only X2 set. Use X2 as position.
x1 = x2;
x2 = Double.NaN;
}
else if (isX2Valid)
{
// X1 and X2 are set.
int result = Numeric.Compare(x1, x2);
if (result < 0)
{
// X1 < X2: Horizontal region.
availableWidth = x2 - x1;
}
else if (result == 0)
{
// X1 == X2: Use only X1.
x2 = Double.NaN;
}
else
{
// X2 > X1: Horizontal region, but swapped.
ChartHelper.Swap(ref x1, ref x2);
availableWidth = x2 - x1;
}
}
if (!isY1Valid && !isY2Valid)
{
// No coordinates set. Use 0 and 'top' alignment.
y1 = 0;
y2 = Double.NaN;
verticalAlignment = VerticalAlignment.Top;
}
else if (!isY1Valid)
{
// Only Y2 set. Use Y2 as position.
y1 = y2;
y2 = Double.NaN;
}
else if (isY2Valid)
{
// Y1 and Y2 are set.
int result = Numeric.Compare(y1, y2);
if (result < 0)
{
// Y1 < Y2: Horizontal region.
availableHeight = y2 - y1;
}
else if (result == 0)
{
// Y1 == Y2: Use only Y1.
y2 = Double.NaN;
}
else
{
// Y2 > Y1: Horizontal region, but swapped.
ChartHelper.Swap(ref y1, ref y2);
availableHeight = y2 - y1;
}
}
// Get size of child.
double elementWidth = child.DesiredSize.Width;
double elementHeight = child.DesiredSize.Height;
if (elementWidth == 0.0 && elementHeight == 0.0 && child is FrameworkElement)
{
// Fix for Silverlight.
FrameworkElement frameworkElement = (FrameworkElement)child;
elementWidth = frameworkElement.ActualWidth;
elementHeight = frameworkElement.ActualHeight;
}
// Compute bounds of the child element.
Rect childBounds = new Rect();
// Position child horizontally.
if (Numeric.IsNaN(x2))
{
// Position child relative to point.
switch (horizontalAlignment)
{
case HorizontalAlignment.Left:
case HorizontalAlignment.Stretch:
childBounds.X = x1;
childBounds.Width = elementWidth;
break;
case HorizontalAlignment.Center:
childBounds.X = x1 - elementWidth / 2.0;
childBounds.Width = elementWidth;
break;
case HorizontalAlignment.Right:
childBounds.X = x1 - elementWidth;
childBounds.Width = elementWidth;
break;
}
}
else
{
// Position child inside horizontal region.
switch (horizontalAlignment)
{
case HorizontalAlignment.Left:
childBounds.X = x1;
childBounds.Width = elementWidth;
break;
case HorizontalAlignment.Center:
childBounds.X = x1 + availableWidth / 2.0 - elementWidth / 2.0;
childBounds.Width = elementWidth;
break;
case HorizontalAlignment.Right:
childBounds.X = x2 - elementWidth;
childBounds.Width = elementWidth;
break;
case HorizontalAlignment.Stretch:
childBounds.X = x1;
childBounds.Width = availableWidth;
break;
}
}
// Position child vertically.
if (Numeric.IsNaN(y2))
{
// Position child relative to point.
switch (verticalAlignment)
{
case VerticalAlignment.Top:
case VerticalAlignment.Stretch:
childBounds.Y = y1;
childBounds.Height = elementHeight;
break;
case VerticalAlignment.Center:
childBounds.Y = y1 - elementHeight / 2.0;
childBounds.Height = elementHeight;
break;
case VerticalAlignment.Bottom:
childBounds.Y = y1 - elementHeight;
childBounds.Height = elementHeight;
break;
}
}
else
{
// Position child inside vertical region.
switch (verticalAlignment)
{
case VerticalAlignment.Top:
childBounds.Y = y1;
childBounds.Height = elementHeight;
break;
case VerticalAlignment.Center:
childBounds.Y = y1 + availableHeight / 2.0 - elementHeight / 2.0;
childBounds.Height = elementHeight;
break;
case VerticalAlignment.Bottom:
childBounds.Y = y2 - elementHeight;
childBounds.Height = elementHeight;
break;
case VerticalAlignment.Stretch:
childBounds.Y = y1;
childBounds.Height = availableHeight;
break;
}
}
// Arrange element.
child.Arrange(childBounds);
// Clip to chart area.
if (elementThatRequiresArrange is UIElement && GetClipToChartArea(elementThatRequiresArrange))
{
UIElement element = (UIElement)elementThatRequiresArrange;
ClipElementToChartArea(element, childBounds);
}
}
}
return finalSize;
}
protected virtual void OnGetStrokeAndFillForLegendSymbol(double paletteIndex, out Brush stroke, out Brush fill)
{
Axis xAxis = XAxis;
Axis yAxis = YAxis;
// Check coloring parameters.
if (PaletteIndex == PaletteIndex.Index && FillMode == AreaFillMode.GradientVertical
|| PaletteIndex == PaletteIndex.XValue && FillMode == AreaFillMode.GradientVertical)
throw new NotSupportedException("Vertical gradients are only supported if the palette is indexed by y values.");
// Set default values for stroke and fill brush.
stroke = null;
fill = null;
// Try to find colors in palette.
// We draw from 0 upwards or from a negative value upwards to 0.
double lower = Math.Min(0, paletteIndex);
double higher = Math.Max(0, paletteIndex);
//if (FillMode == AreaFillMode.Solid)
//{
// // Fill legend symbol with single color.
// lower = higher;
//}
// Define gradient direction.
Point startPoint;
Point endPoint;
if (PaletteIndex == PaletteIndex.Index || PaletteIndex == PaletteIndex.XValue ||
FillMode == AreaFillMode.GradientHorizontal || FillMode == AreaFillMode.Solid)
{
startPoint = new Point(0, 0);
endPoint = new Point(1, 0);
if (xAxis != null && xAxis.Scale != null && xAxis.Scale.Reversed)
ChartHelper.Swap(ref startPoint, ref endPoint);
}
else
{
startPoint = new Point(0, 1);
endPoint = new Point(0, 0);
if (yAxis != null && yAxis.Scale != null && yAxis.Scale.Reversed)
ChartHelper.Swap(ref startPoint, ref endPoint);
}
// Get brush for fill and stroke.
if (FillPalette != null && FillPalette.Count > 0)
{
fill = new LinearGradientBrush
{
GradientStops = FillPalette.GetGradient(lower, higher),
StartPoint = startPoint,
EndPoint = endPoint,
ColorInterpolationMode = FillPalette.ColorInterpolationMode
};
}
if (StrokePalette != null && StrokePalette.Count > 0)
{
stroke = new LinearGradientBrush
{
GradientStops = StrokePalette.GetGradient(lower, higher),
StartPoint = startPoint,
EndPoint = endPoint,
ColorInterpolationMode = StrokePalette.ColorInterpolationMode
};
}
}
protected virtual void OnGetStrokeAndFillForSegment(int index, out Brush stroke, out Brush fill)
{
Axis xAxis = XAxis;
Axis yAxis = YAxis;
// Check coloring parameters.
if (PaletteIndex == PaletteIndex.Index && FillMode == AreaFillMode.GradientVertical
|| PaletteIndex == PaletteIndex.XValue && FillMode == AreaFillMode.GradientVertical)
{
throw new NotSupportedException("Vertical gradients are only supported if the palette is indexed by y values.");
}
// Find palette index.
double paletteIndex = 0;
switch (PaletteIndex)
{
case PaletteIndex.Index:
paletteIndex = index;
break;
case PaletteIndex.XValue:
paletteIndex = Data[index].X;
break;
case PaletteIndex.YValue:
paletteIndex = Data[index].Y;
break;
default:
throw new NotSupportedException("PaletteIndex type is not supported.");
}
// Set default values for stroke and fill brush.
stroke = null;
fill = null;
// Try to find colors in palette.
if (FillMode == AreaFillMode.Solid)
{
// Solid:
// Get a solid color fill for fill and stroke.
if (FillPalette != null && FillPalette.Count > 0)
fill = new SolidColorBrush(FillPalette.GetColor(paletteIndex));
if (StrokePalette != null && StrokePalette.Count > 0)
stroke = new SolidColorBrush(StrokePalette.GetColor(paletteIndex));
}
else
{
// Get data values.
DataPoint data = Data[index];
DataPoint dataBase = new DataPoint(data.X, 0, null); // The base is currently always y = 0.
DataPoint previousData = (index > 0) ? Data[index - 1] : data;
DataPoint previousDataBase = new DataPoint(previousData.X, 0, null); // The base is currently always y = 0.
DataPoint nextData = (index < Data.Count - 1) ? Data[index + 1] : data;
DataPoint nextDataBase = new DataPoint(nextData.X, 0, null); // The base is currently always y = 0.
// Gradient:
double fillStart;
double fillEnd;
double strokeStart;
double strokeEnd;
// Define palette index values.
ChartInterpolation interpolation = EffectiveInterpolation;
if (PaletteIndex == PaletteIndex.Index)
{
// Index-based
if (interpolation == ChartInterpolation.CenteredSteps)
{
fillStart = strokeStart = Math.Max(index - 0.5, 0);
fillEnd = strokeEnd = Math.Min(index + 0.5, Data.Count - 1);
}
else if (interpolation == ChartInterpolation.LeftSteps)
{
fillStart = strokeStart = Math.Max(index - 1, 0);
fillEnd = strokeEnd = index;
}
else
{
fillStart = strokeStart = index;
fillEnd = strokeEnd = index + 1;
}
}
else if (PaletteIndex == PaletteIndex.XValue)
{
// x value based
if (interpolation == ChartInterpolation.CenteredSteps)
{
fillStart = strokeStart = (previousData.X + data.X) / 2;
fillEnd = strokeEnd = (data.X + nextData.X) / 2;
}
else if (interpolation == ChartInterpolation.LeftSteps)
{
fillStart = strokeStart = previousData.X;
fillEnd = strokeEnd = data.X;
}
else
{
fillStart = strokeStart = data.X;
fillEnd = strokeEnd = nextData.X;
}
}
else
{
// y value based
if (FillMode == AreaFillMode.GradientHorizontal)
{
if (interpolation == ChartInterpolation.CenteredSteps)
{
fillStart = strokeStart = (previousData.Y + data.Y) / 2;
fillEnd = strokeEnd = (data.Y + nextData.Y) / 2;
}
else if (interpolation == ChartInterpolation.LeftSteps)
{
fillStart = strokeStart = previousData.Y;
fillEnd = strokeEnd = data.Y;
}
else
{
fillStart = strokeStart = data.Y;
fillEnd = strokeEnd = nextData.Y;
}
}
else
{
fillStart = Math.Min(0, Math.Min(data.Y, dataBase.Y));
fillEnd = Math.Max(0, Math.Max(data.Y, dataBase.Y));
if (interpolation == ChartInterpolation.Linear)
{
fillStart = Math.Min(fillStart, Math.Min(nextData.Y, nextDataBase.Y));
fillEnd = Math.Max(fillEnd, Math.Max(nextData.Y, nextDataBase.Y));
}
// This is the only case where the stroke has a different start and end value than the fill.
// (Because the fill starts at y=0, but the line starts at the data point.)
strokeStart = data.Y;
strokeEnd = nextData.Y;
if (strokeStart > strokeEnd)
ChartHelper.Swap(ref strokeStart, ref strokeEnd);
}
}
// Define gradient direction.
Point startPoint;
Point endPoint;
if (PaletteIndex == PaletteIndex.Index || PaletteIndex == PaletteIndex.XValue || FillMode == AreaFillMode.GradientHorizontal)
{
startPoint = new Point(0, 0);
endPoint = new Point(1, 0);
if (xAxis != null && xAxis.Scale != null && xAxis.Scale.Reversed)
ChartHelper.Swap(ref startPoint, ref endPoint);
}
else
{
startPoint = new Point(0, 1);
endPoint = new Point(0, 0);
if (yAxis != null && yAxis.Scale != null && yAxis.Scale.Reversed)
ChartHelper.Swap(ref startPoint, ref endPoint);
}
// Get brush for fill and stroke.
if (FillPalette != null && FillPalette.Count > 0)
{
fill = new LinearGradientBrush
{
GradientStops = FillPalette.GetGradient(fillStart, fillEnd),
StartPoint = startPoint,
EndPoint = endPoint,
ColorInterpolationMode = FillPalette.ColorInterpolationMode
};
}
if (StrokePalette != null && StrokePalette.Count > 0)
{
stroke = new LinearGradientBrush
{
GradientStops = StrokePalette.GetGradient(strokeStart, strokeEnd),
StartPoint = startPoint,
EndPoint = endPoint,
ColorInterpolationMode = StrokePalette.ColorInterpolationMode
};
}
}
}