internal static void DrawText(this DrawingContext dc, FormattedText text, TextPosition textPosition)
{
//dc.DrawEllipse(Brushes.Black, null, textPosition.Point, 2, 2); // Used to debug
if (textPosition.IsTransformed)
{
dc.PushTransform(textPosition.Transform);
}
dc.DrawText(text, textPosition.Point);
if (textPosition.IsTransformed)
{
dc.Pop();
}
}
protected override void OnRender(DrawingContext dc)
{
var arc = Arc.Fill(this.RenderSize, this.MinAngle, this.MaxAngle, this.IsDirectionReversed);
for (int i = 0; i < this.AllTicks.Count; i++)
{
var tick = this.AllTicks[i];
var text = this.AllTexts[i];
var angle = TickHelper.ToAngle(tick, this.Minimum, this.Maximum, arc);
var point = arc.GetPoint(angle, -this.ReservedSpace / 2 - this.TextSpace / 2);
var textPosition = new TextPosition(text, new TextPositionOptions(this.TextOrientation, angle), point, angle);
dc.DrawText(text, textPosition);
}
}
protected override Size MeasureOverride(Size availableSize)
{
var bounds = new Rect();
var midPoint = new Point(0, 0);
var arc = new Arc(midPoint, this.MinAngle, this.MaxAngle, this.ReservedSpace, this.IsDirectionReversed);
for (int i = 0; i < this.AllTicks.Count; i++)
{
var tick = this.AllTicks[i];
var text = this.AllTexts[i];
var angle = TickHelper.ToAngle(tick, this.Minimum, this.Maximum, arc);
var point = arc.GetPoint(angle);
var textPosition = new TextPosition(text, new TextPositionOptions(this.TextOrientation, angle), point, angle);
bounds.Union(textPosition.TransformedBounds);
}
var points = new[] { bounds.TopLeft, bounds.TopRight, bounds.BottomRight, bounds.BottomLeft };
this.TextSpace = 2 * points.Max(p => (p - midPoint).Length);
return bounds.Size;
}
protected override void OnRender(DrawingContext dc)
{
if (this.Foreground == null)
{
return;
}
var line = new Line(this.ActualWidth, this.ActualHeight, this.ReservedSpace, this.Placement, this.IsDirectionReversed);
for (int i = 0; i < this.AllTicks.Count; i++)
{
var tick = this.AllTicks[i];
var pos = TickHelper.ToPos(tick, this.Minimum, this.Maximum, line);
var text = this.AllTexts[i];
var textPosition = new TextPosition(text, new TextPositionOptions(this.Placement, this.TextOrientation), pos, 0);
dc.DrawText(text, textPosition);
}
}
