/// <summary>
/// Renders a tick by drawing an lot of segments
/// </summary>
/// <param name="axis">The axis.</param>
/// <param name="angleAxis">The angle axis.</param>
/// <param name="x">The x-value.</param>
/// <param name="pen">The pen.</param>
private void RenderTickArc(Axis axis, AngleAxis angleAxis, double x, OxyPen pen)
{
// caution: make sure angleAxis.UpdateActualMaxMin(); has been called
var minAngle = angleAxis.ActualMinimum;
var maxAngle = angleAxis.ActualMaximum;
// number of segment to draw a full circle
// - decrease if you want get more speed
// - increase if you want more detail
// (making a public property of it would be a great idea)
const double MaxSegments = 90.0;
// compute the actual number of segments
var segmentCount = (int)(MaxSegments * Math.Abs(angleAxis.EndAngle - angleAxis.StartAngle) / 360.0);
var angleStep = (maxAngle - minAngle) / (segmentCount - 1);
var points = new List <ScreenPoint>();
for (var i = 0; i < segmentCount; i++)
{
var angle = minAngle + (i * angleStep);
points.Add(axis.Transform(x, angle, angleAxis));
}
this.RenderContext.DrawLine(points, pen.Color, pen.Thickness, pen.ActualDashArray);
}
/// <summary>
/// Renders a tick, chooses the best implementation
/// </summary>
/// <param name="axis">The axis.</param>
/// <param name="angleAxis">The angle axis.</param>
/// <param name="x">The x-value.</param>
/// <param name="pen">The pen.</param>
private void RenderTick(Axis axis, AngleAxis angleAxis, double x, OxyPen pen)
{
var isFullCircle = Math.Abs(Math.Abs(angleAxis.EndAngle - angleAxis.StartAngle) - 360) < 1e-6;
if (isFullCircle && pen.ActualDashArray == null)
{
this.RenderTickCircle(axis, angleAxis, x, pen);
}
else
{
this.RenderTickArc(axis, angleAxis, x, pen);
}
}
/// <summary>
/// Renders a tick by drawing an lot of segments
/// </summary>
/// <param name="axis">The axis.</param>
/// <param name="angleAxis">The angle axis.</param>
/// <param name="x">The x-value.</param>
/// <param name="pen">The pen.</param>
/// <param name="startAngle">The start angle.</param>
/// <param name="endAngle">The end angle.</param>
private void RenderTickArc(Axis axis, AngleAxis angleAxis, double x, OxyPen pen, double startAngle, double endAngle)
{
if (startAngle > endAngle)
{
}
// caution: make sure angleAxis.UpdateActualMaxMin(); has been called
// number of segment to draw a full circle
// - decrease if you want get more speed
// - increase if you want more detail
// (making a public property of it would be a great idea)
// compute the actual number of segments
var segmentCount = (int)(MaxSegments * Math.Abs(endAngle - startAngle) / 360.0);
if (angleAxis.FractionUnit == Math.PI || angleAxis.ActualMaximum == 2 * Math.PI)
{
segmentCount = (int)(MaxSegments * Math.Abs(endAngle - startAngle) / (2 * Math.PI));
startAngle *= rad;
endAngle *= rad;
}
segmentCount = Math.Max(segmentCount, 2);
segmentCount = Math.Min(segmentCount, (int)MaxSegments);
var angleStep = Math.Abs(endAngle - startAngle) / (segmentCount - 1);
var points = new List <ScreenPoint>();
for (var i = 0; i < segmentCount; i++)
{
var angle = startAngle + (i * angleStep);
ScreenPoint toadd = axis.Transform(x, angle, angleAxis);
points.Add(toadd);
}
this.RenderContext.DrawLine(points, pen.Color, pen.Thickness, axis.EdgeRenderingMode, pen.ActualDashArray);
}
/// <summary>
/// Renders a tick by drawing an lot of segments
/// </summary>
/// <param name="axis">The axis.</param>
/// <param name="angleAxis">The angle axis.</param>
/// <param name="x">The x-value.</param>
/// <param name="pen">The pen.</param>
private void RenderTickArc(Axis axis, AngleAxis angleAxis, double x, OxyPen pen)
{
// caution: make sure angleAxis.UpdateActualMaxMin(); has been called
var minAngle = angleAxis.ActualMinimum;
var maxAngle = angleAxis.ActualMaximum;
// number of segment to draw a full circle
// - decrease if you want get more speed
// - increase if you want more detail
// (making a public property of it would be a great idea)
const double MaxSegments = 90.0;
// compute the actual number of segments
var segmentCount = (int)(MaxSegments * Math.Abs(angleAxis.EndAngle - angleAxis.StartAngle) / 360.0);
var angleStep = (maxAngle - minAngle) / (segmentCount - 1);
var points = new List<ScreenPoint>();
for (var i = 0; i < segmentCount; i++)
{
var angle = minAngle + (i * angleStep);
points.Add(axis.Transform(x, angle, angleAxis));
}
this.RenderContext.DrawLine(points, pen.Color, pen.Thickness, pen.ActualDashArray);
}
/// <summary>
/// Renders a tick, chooses the best implementation
/// </summary>
/// <param name="axis">The axis.</param>
/// <param name="angleAxis">The angle axis.</param>
/// <param name="x">The x-value.</param>
/// <param name="pen">The pen.</param>
private void RenderTick(Axis axis, AngleAxis angleAxis, double x, OxyPen pen)
{
var isFullCircle = Math.Abs(Math.Abs(angleAxis.EndAngle - angleAxis.StartAngle) - 360) < 1e-6;
if (isFullCircle && pen.ActualDashArray == null)
{
this.RenderTickCircle(axis, angleAxis, x, pen);
}
else
{
this.RenderTickArc(axis, angleAxis, x, pen);
}
}
public static PlotModel OffsetAngles()
{
var model = new PlotModel
{
Title = "Offset angle axis",
PlotType = PlotType.Polar,
PlotAreaBorderThickness = new OxyThickness(0),
PlotMargins = new OxyThickness(60, 20, 4, 40)
};
var angleAxis = new AngleAxis
{
Minimum = 0,
Maximum = Math.PI * 2,
MajorStep = Math.PI / 4,
MinorStep = Math.PI / 16,
StringFormat = "0.00",
StartAngle = 30,
EndAngle = 390
};
model.Axes.Add(angleAxis);
model.Axes.Add(new MagnitudeAxis());
model.Series.Add(new FunctionSeries(t => t, t => t, 0, Math.PI * 6, 0.01));
// Subscribe to the mouse down event on the line series.
model.MouseDown += (s, e) =>
{
var increment = 0d;
// Increment and decrement must be in degrees (corresponds to the StartAngle and EndAngle properties).
if (e.ChangedButton == OxyMouseButton.Left)
{
increment = 15;
}
if (e.ChangedButton == OxyMouseButton.Right)
{
increment = -15;
}
if (Math.Abs(increment) > double.Epsilon)
{
angleAxis.StartAngle += increment;
angleAxis.EndAngle += increment;
model.InvalidatePlot(false);
e.Handled = true;
}
};
return model;
}
