public static PlotModel ArrowAnnotation()
{
var model = new PlotModel("ArrowAnnotation", "Click and drag the arrow.");
model.Axes.Add(new LinearAxis(AxisPosition.Bottom, -40, 60));
model.Axes.Add(new LinearAxis(AxisPosition.Left, -10, 10));
var arrow = new ArrowAnnotation { StartPoint = new DataPoint(8, 4), EndPoint = new DataPoint(0, 0), Text = "Move me!" };
var lastPoint = DataPoint.Undefined;
bool moveStartPoint = false;
bool moveEndPoint = false;
var originalColor = OxyColors.White;
// Handle left mouse clicks
arrow.MouseDown += (s, e) =>
{
if (e.ChangedButton != OxyMouseButton.Left)
{
return;
}
lastPoint = arrow.InverseTransform(e.Position);
moveStartPoint = e.HitTestResult.Index != 2;
moveEndPoint = e.HitTestResult.Index != 1;
originalColor = arrow.Color;
arrow.Color = OxyColors.Red;
model.InvalidatePlot(false);
e.Handled = true;
};
// Handle mouse movements (note: this is only called when the mousedown event was handled)
arrow.MouseMove += (s, e) =>
{
var thisPoint = arrow.InverseTransform(e.Position);
double dx = thisPoint.X - lastPoint.X;
double dy = thisPoint.Y - lastPoint.Y;
if (moveStartPoint)
{
arrow.StartPoint = new DataPoint(arrow.StartPoint.X + dx, arrow.StartPoint.Y + dy);
}
if (moveEndPoint)
{
arrow.EndPoint = new DataPoint(arrow.EndPoint.X + dx, arrow.EndPoint.Y + dy);
}
lastPoint = thisPoint;
model.InvalidatePlot(false);
e.Handled = true;
};
// Handle mouse up (note: this is only called when the mousedown event was handled)
arrow.MouseUp += (s, e) =>
{
arrow.Color = originalColor;
};
model.Annotations.Add(arrow);
return model;
}
public static PlotModel AddAnnotations()
{
var model = new PlotModel("Add arrow annotations", "Press and drag the left mouse button");
var xaxis = new LinearAxis(AxisPosition.Bottom);
var yaxis = new LinearAxis(AxisPosition.Left);
model.Axes.Add(xaxis);
model.Axes.Add(yaxis);
model.Series.Add(new FunctionSeries(x => Math.Sin(x / 4) * Math.Acos(Math.Sin(x)), 0, Math.PI * 8, 2000, "sin(x/4)*acos(sin(x))"));
ArrowAnnotation tmp = null;
// Add handlers to the PlotModel's mouse events
model.MouseDown += (s, e) =>
{
if (e.ChangedButton == OxyMouseButton.Left)
{
// Create a new arrow annotation
tmp = new ArrowAnnotation();
tmp.StartPoint = tmp.EndPoint = Axis.InverseTransform(e.Position, xaxis, yaxis);
model.Annotations.Add(tmp);
e.Handled = true;
}
};
// Handle mouse movements (note: this is only called when the mousedown event was handled)
model.MouseMove += (s, e) =>
{
if (tmp != null)
{
// Modify the end point
tmp.EndPoint = Axis.InverseTransform(e.Position, xaxis, yaxis);
tmp.Text = string.Format("Y = {0:0.###}", tmp.EndPoint.Y);
// Redraw the plot
model.RefreshPlot(false);
e.Handled = true;
}
};
model.MouseUp += (s, e) =>
{
if (tmp != null)
{
tmp = null;
e.Handled = true;
}
};
return model;
}
