Zedgraph X-axis scaling values
I would like to increase the values shown in X-axis of a graph I am working on, in such a way:
X-axis starts in 0.125, then it shows 0.250, 0.5, 1.0, and then the numbers are 1.5, 2, 3,4,5,6,8,12 as in following image (of course the graph is incorrect, but I wanted to show the scaling of X-axis values)
Currently I have this:
to do this I have (vb.net version)
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Drawing
Imports System.Text
Imports System.Windows.Forms
Imports ZedGraph
Namespace Grid
Partial Public Class graficaControl
Inherits Form
Public Sub New()
InitializeComponent()
DrawGraph()
End Sub
Private Function h(ByVal x As Double) As Double
If x = 0 Then
Return 1
End If
Return Math.Sin(x) / x
End Function
Private Function f(ByVal x As Double) As Double
If x = 0 Then
Return 1
End If
Return Math.Sin(x)
End Function
Private Function g(ByVal x As Double) As Double
If x = 1 Then
Return 0
End If
Return Math.Cos(x)
End Function
Private Sub DrawGraph()
Dim masterPane As ZedGraph.MasterPane = zedGraph.MasterPane
Dim pane As New GraphPane()
masterPane.PaneList.Clear()
pane.XAxis.Title.Text = "X"
pane.XAxis.Title.FontSpec.IsUnderline = False
pane.XAxis.Title.FontSpec.IsBold = True
pane.XAxis.Title.FontSpec.FontColor = Color.Blue
pane.YAxis.Title.Text = "Y"
pane.Title.Text = "Right - FF1"
pane.Title.FontSpec.Fill.IsVisible = True
pane.Title.FontSpec.IsBold = False
'X AXIS UP
pane.X2Axis.IsVisible = True
pane.XAxis.IsVisible = False
pane.YAxis.Scale.IsReverse = True
'Grid
pane.XAxis.MajorGrid.IsVisible = True
pane.XAxis.MajorGrid.DashOn = 10
pane.XAxis.MajorGrid.DashOff = 5
pane.YAxis.MajorGrid.IsVisible = True
pane.YAxis.MajorGrid.DashOn = 10
pane.YAxis.MajorGrid.DashOff = 5
pane.YAxis.MinorGrid.IsVisible = True
pane.YAxis.MinorGrid.DashOn = 1
pane.YAxis.MinorGrid.DashOff = 2
pane.XAxis.MinorGrid.IsVisible = True
pane.XAxis.MinorGrid.DashOn = 1
pane.XAxis.MinorGrid.DashOff = 2
'FOR TEXT
pane.Legend.Position = LegendPos.Float
pane.Legend.Location.CoordinateFrame = CoordType.ChartFraction
pane.Legend.Location.AlignH = AlignH.Right
pane.Legend.Location.AlignV = AlignV.Bottom
pane.Legend.Location.TopLeft = New PointF(1.0F - 0.02F, 1.0F - 0.02F)
iGraph(pane)
' Add to master
masterPane.Add(pane)
'later add second graph
Using g As Graphics = CreateGraphics()
masterPane.SetLayout(g, PaneLayout.SquareColPreferred)
End Using
zedGraph.AxisChange()
zedGraph.Invalidate()
End Sub
Private Sub iGraph(ByVal izq As GraphPane)
izq.CurveList.Clear()
Dim list As New PointPairList()
Dim xmin As Double = -50
Dim xmax As Double = 3
Dim x As Double = xmin
While x <= xmax
list.Add(x, h(x))
x += 0.01
End While
Dim myCurve As LineItem = izq.AddCurve("sen(x)/x", list, Color.ForestGreen, SymbolType.None)
End Sub
Private WithEvents zedGraph As ZedGraph.ZedGraphControl
Private Sub InitializeComponent()
Me.zedGraph = New ZedGraph.ZedGraphControl()
Me.SuspendLayout()
'
'zedGraph
'
Me.zedGraph.Dock = System.Windows.Forms.DockStyle.Fill
Me.zedGraph.Location = New System.Drawing.Point(0, 0)
Me.zedGraph.Name = "Name"
Me.zedGraph.ScrollGrace = 0.0R
Me.zedGraph.ScrollMaxX = 0.0R
Me.zedGraph.ScrollMaxY = 0.0R
Me.zedGraph.ScrollMaxY2 = 0.0R
Me.zedGraph.ScrollMinX = 0.0R
Me.zedGraph.ScrollMinY = 0.0R
Me.zedGraph.ScrollMinY2 = 0.0R
Me.zedGraph.Size = New System.Drawing.Size(732, 461)
Me.zedGraph.TabIndex = 1
'
'component
'
Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
Me.ClientSize = New System.Drawing.Size(732, 461)
Me.Controls.Add(Me.zedGraph)
Me.Name = "graph"
Me.Text = "test"
Me.ResumeLayout(False)
End Sub
End Class
End Namespace
also c# version
using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.ComponentModel;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using ZedGraph;
namespace Grid
{
public partial class graficaControl : Form
{
public graficaControl()
{
InitializeComponent();
DrawGraph();
}
private double h(double x)
{
if (x == 0) {
return 1;
}
return Math.Sin(x) / x;
}
private double f(double x)
{
if (x == 0) {
return 1;
}
return Math.Sin(x);
}
private double g(double x)
{
if (x == 1) {
return 0;
}
return Math.Cos(x);
}
private void DrawGraph()
{
ZedGraph.MasterPane masterPane = zedGraph.MasterPane;
GraphPane pane = new GraphPane();
masterPane.PaneList.Clear();
pane.XAxis.Title.Text = "X";
pane.XAxis.Title.FontSpec.IsUnderline = false;
pane.XAxis.Title.FontSpec.IsBold = true;
pane.XAxis.Title.FontSpec.FontColor = Color.Blue;
pane.YAxis.Title.Text = "Y";
pane.Title.Text = "Right - FF1";
pane.Title.FontSpec.Fill.IsVisible = true;
pane.Title.FontSpec.IsBold = false;
//X AXIS UP
pane.X2Axis.IsVisible = true;
pane.XAxis.IsVisible = false;
pane.YAxis.Scale.IsReverse = true;
//Grid
pane.XAxis.MajorGrid.IsVisible = true;
pane.XAxis.MajorGrid.DashOn = 10;
pane.XAxis.MajorGrid.DashOff = 5;
pane.YAxis.MajorGrid.IsVisible = true;
pane.YAxis.MajorGrid.DashOn = 10;
pane.YAxis.MajorGrid.DashOff = 5;
pane.YAxis.MinorGrid.IsVisible = true;
pane.YAxis.MinorGrid.DashOn = 1;
pane.YAxis.MinorGrid.DashOff = 2;
pane.XAxis.MinorGrid.IsVisible = true;
pane.XAxis.MinorGrid.DashOn = 1;
pane.XAxis.MinorGrid.DashOff = 2;
//FOR TEXT
pane.Legend.Position = LegendPos.Float;
pane.Legend.Location.CoordinateFrame = CoordType.ChartFraction;
pane.Legend.Location.AlignH = AlignH.Right;
pane.Legend.Location.AlignV = AlignV.Bottom;
pane.Legend.Location.TopLeft = new PointF(1f - 0.02f, 1f - 0.02f);
iGraph(pane);
// Add to master
masterPane.Add(pane);
//later add second graph
using (Graphics g = CreateGraphics()) {
masterPane.SetLayout(g, PaneLayout.SquareColPreferred);
}
zedGraph.AxisChange();
zedGraph.Invalidate();
}
private void iGraph(GraphPane izq)
{
izq.CurveList.Clear();
PointPairList list = new PointPairList();
double xmin = -50;
double xmax = 3;
double x = xmin;
while (x <= xmax) {
list.Add(x, h(x));
x += 0.01;
}
LineItem myCurve = izq.AddCurve("sen(x)/x", list, Color.ForestGreen, SymbolType.None);
}
private ZedGraph.ZedGraphControl zedGraph;
private void InitializeComponent()
{
this.zedGraph = new ZedGraph.ZedGraphControl();
this.SuspendLayout();
//
//zedGraph
//
this.zedGraph.Dock = System.Windows.Forms.DockStyle.Fill;
this.zedGraph.Location = new System.Drawing.Point(0, 0);
this.zedGraph.Name = "Name";
this.zedGraph.ScrollGrace = 0.0;
this.zedGraph.ScrollMaxX = 0.0;
this.zedGraph.ScrollMaxY = 0.0;
this.zedGraph.ScrollMaxY2 = 0.0;
this.zedGraph.ScrollMinX = 0.0;
this.zedGraph.ScrollMinY = 0.0;
this.zedGraph.ScrollMinY2 = 0.0;
this.zedGraph.Size = new System.Drawing.Size(732, 461);
this.zedGraph.TabIndex = 1;
//
//component
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6f, 13f);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(732, 461);
this.Controls.Add(this.zedGraph);
this.Name = "graph";
this.Text = "test";
this.ResumeLayout(false);
}
}
}
Update
I have done the following and it is almost solved
'disable old axis scale
pane.X2Axis.Scale.IsVisible = False
pane.X2Axis.MajorTic.IsAllTics = False
' new labels
Dim x_vals = {0.125, 0.25, 0.5, 0.75, 1.0, 1.5, 2.0, 3.0, 4.0, 6.0, 8.0, 12.0, 16.0}
' create custom labels and custom grid-lines using LineObj
For Each val As Double In x_vals
'add line
Dim line As New LineObj(pane.YAxis.Scale.Min, val, pane.YAxis.Scale.Max, val)
line.Line.Style = System.Drawing.Drawing2D.DashStyle.Dash
line.Line.Width = 1.0F
pane.GraphObjList.Add(line)
'add label
Dim text As New TextObj(val.ToString(), pane.YAxis.Scale.Min, val)
text.Location.AlignH = AlignH.Right
text.FontSpec.Border.IsVisible = False
text.FontSpec.Fill.IsVisible = False
pane.GraphObjList.Add(text)
Next
getting:
Answer
The scale you want is non-linear and so you need to change it to something like a logarithmic scale. Try screwing around with the AxisType Enumeration. At first glance I would guess you'll need a scaled logarithmic axis, or if that doesn't work just use an ordinal axis. It won't 'squeeze' the data points in but at least they will be labeled properly. If all else fails try using the string-array method (basically you fill out an array with the data points you want labeled). Good luck!
EX:
pane.XAxis.Type = AxisType.Log;
Note that this will be a straight up base 10 logarithmic axis type, so it won't be the exact same numbers that you wanted.