Line.md

Line plot

Description

The line plot displays deviations from a straight line in both positive and negative direction. The line plot data can also be displayed as roughness plot.

Points

Line points consist of...

• Position (1D)
• Deviation

The positions don't have to be equidistant like in the example.

Geometry

The plot axis can be modified with the actual geometry parameters Length and Position. The Length parameter will be multiplied to the points position range to determine the value range of the plot, while the Position parameter is added as an offset. The plots ProjectionAxis determines, which coordinate of the Position is used as offset.

Example

var plot = new StraightnessPlot();
var points = new List<LinePoint>();

var rand = new Random( DateTime.Now.Millisecond );
var segment = new Segment( "All", SegmentTypes.None );

plot.Actual.Length = 5.0; //All positions will be multiplied with the length when the plot is drawn.

//The actual position and length, together with the projection axis, will result in an offset on the plots x-axis.
//In this example, the plot's value will start at 8.0;
plot.Actual.Position = new Vector( 0, 8 );
plot.ProjectionAxis = ProjectionAxis.Y;

for( var i = 0; i < pointCount; i++ )
{
	var position = ( double ) i / pointCount;
	var deviation = 0.1 * ( Math.Sin( position * 2.0 * Math.PI ) + ( rand.NextDouble() - 0.5 ) * 0.1 );
	var point = new LinePoint( segment, position, deviation );

	points.Add( point );
}

plot.Tolerance = new Tolerance( -0.1, 0.1 );
plot.DefaultErrorScaling = 100;
plot.Points = points;

Remarks

• While the plot might have resemblance with a mathematical function plotter, PiWeb assumes that the deviations are much smaller than the position. The error scaling can't be smaller than 1.0.