// Simple plot with interpolated difference curve
private void CreateGraph_DifferencePlot( ZedGraphControl z1 )
{
GraphPane myPane = z1.GraphPane;
// Generate the first data set
PointPairList list1 = new PointPairList();
for ( int i = 0; i < 13; i++ )
{
double x = i + 11.0;
double y = 150.0 * ( 1.0 + Math.Sin( i * 0.3 ) );
list1.Add( x, y );
}
// Generate a second data set that is unrelated to the first
PointPairList list2 = new PointPairList();
for ( int i = 0; i < 15; i++ )
{
double x = i * 1.2 + 10.0;
double y = 250.0 * ( 1.0 + Math.Sin( x * 0.5 ) );
list2.Add( x, y );
}
// Make sure the data are sorted and monotonically increasing
list1.Sort();
list2.Sort();
// Get the lower and upper limit of the data
// This code can throw an exception if either list is empty
double xMin = Math.Min( list1[0].X, list2[0].X );
double xMax = Math.Max( list1[list1.Count - 1].X, list2[list2.Count - 1].X );
// Create a new list that will hold the difference points
PointPairList diffList = new PointPairList();
// Select the number of points for the new difference curve
// This is completely arbitrary, but more points will make it smoother in the
// case of SplineInterpolation
const int count = 50;
// Loop for each data point to be created in the new PointPairList
for ( int i=0; i<count; i++ )
{
// Calculated X values are evenly spaced
double x = xMin + (double) i * ( xMax - xMin ) / count;
// Use spline interpolation to create the Y values for the new curve
// Note that this allows extrapolation beyond the actual data available
// A tension value of 0.5 is used, but anywhere between 0 and 1 is reasonable
//double y = list1.InterpolateX( x );
double y1 = list1.InterpolateX( x );
double y2 = list2.SplineInterpolateX( x, 0.5 );
// Add the new Point to the list taking the difference between the Y values
// If either value is Missing, it means that a point was extrapolated beyond
// the available data, which is not allowed for SplineInterpolateX()
// This won't happen with InterpolateX, since it allows extrapolation
if ( y1 == PointPair.Missing || y2 == PointPair.Missing )
diffList.Add( x, PointPair.Missing, PointPair.Missing );
else
diffList.Add( x, y1 - y2, (y1-y2) > 0 ? 1 : 0 );
}
// Create the three curves -- two datasets, plus a difference curve
LineItem diffCurve = myPane.AddCurve( "diff", diffList, Color.Red, SymbolType.None );
LineItem myCurve1 = myPane.AddCurve( "curve", list1, Color.Blue, SymbolType.Diamond );
LineItem myCurve2 = myPane.AddCurve( "curve 2", list2, Color.Green, SymbolType.Circle );
Color[] colors = { Color.Red, Color.Green };
diffCurve.Line.Fill = new Fill( colors, 90 );
diffCurve.Line.Fill.RangeMin = 0;
diffCurve.Line.Fill.RangeMax = 1;
diffCurve.Line.Fill.Type = FillType.GradientByZ;
//diffCurve.Line.GradientFill = new Fill( colors, 90 );
//diffCurve.Line.GradientFill.RangeMin = -100;
//diffCurve.Line.GradientFill.RangeMax = 200;
//diffCurve.Line.IsOptimizedDraw = true;
// Add some "pretty" stuff (optional)
myCurve1.Symbol.Fill = new Fill( Color.White );
myCurve2.Symbol.Fill = new Fill( Color.White );
diffCurve.Line.Width = 2.0f;
//diffCurve.Symbol.Fill = new Fill( Color.White );
myPane.Title.Text = "Interpolated Data Curve";
myPane.XAxis.Title.Text = "Period";
myPane.YAxis.Title.Text = "Response";
myPane.Legend.FontSpec.Size = 14;
myPane.Fill = new Fill( Color.WhiteSmoke, Color.Lavender, 0F );
myPane.Chart.Fill = new Fill( Color.FromArgb( 255, 255, 245 ),
Color.FromArgb( 255, 255, 190 ), 90F );
XDate xx = new XDate( 2007, 11, 9 );
XDate x2 = new XDate( 2007, 11, 9 );
XDate x3 = new XDate( 2007, 11, 9, 1, 1, 1 );
object junk = new object();
int i1 = xx.CompareTo( xx );
int i2 = xx.CompareTo( x2 );
int i3 = xx.CompareTo( x3 );
int i4 = x2.CompareTo( xx );
int i5 = x2.CompareTo( x3 );
int i6 = x3.CompareTo( x2 );
int i7 = x3.CompareTo( junk );
z1.IsAntiAlias = true;
z1.AxisChange();
}
private void CreateGraph_LineColorGradient2( ZedGraphControl zgc )
{
GraphPane myPane = zgc.GraphPane;
PointPairList list = new PointPairList();
const int count = 30;
for ( int i = 0; i < count; i++ )
{
// Use an ordinary sine function to generate the curve
double x = i + 1;
double y = 5 * Math.Sin( (double) i * Math.PI * 3 / count ) + 5.0;
// Set the Z value to be 2.0 if y is between 4 and 6, otherwise, it's 1.0
list.Add( x, y, y > 4 && y < 6 ? 2.0 : 1.0 );
}
// Create a curve with symbols only
LineItem myCurve = myPane.AddCurve( "Test Curve", list, Color.Red, SymbolType.Diamond );
myCurve.Line.IsVisible = false;
myCurve.Symbol.Fill = new Fill( Color.White );
// Create a second curve, with lots of extra points
const int count2 = 1000;
PointPairList list2 = new PointPairList();
// Points are equal-spaced, across all the X range
double dx = ( list[list.Count - 1].X - list[0].X ) / (double) count2;
// Calculate the extra points values using linear interpolation
for ( int i = 0; i <= count2; i++ )
{
double x2 = list[0].X + dx * (double) i;
double y2 = list.InterpolateX( x2 );
list2.Add( x2, y2, y2 > 4 && y2 < 6 ? 2.0 : 1.0 );
}
// Add the second curve with no symbols
LineItem myCurve2 = myPane.AddCurve( "Curve2", list2, Color.Blue, SymbolType.None );
// use a gradient fill to color the each line segment according to its Z value
// Color will be blue for Z = 2, and red for Z = 1
Fill fill = new Fill( Color.Red, Color.Blue );
fill.RangeMin = 1;
fill.RangeMax = 2;
fill.Type = FillType.GradientByZ;
myCurve2.Line.GradientFill = fill;
// make the line fat
myCurve2.Line.Width = 2.0f;
// Create a band of green to show the highlighted region
BoxObj box = new BoxObj( 0.0, 6.0, 1.0, 2.0, Color.Empty,
Color.FromArgb( 150, Color.LightGreen ) );
// Use CoordType.XChartFractionYScale, so that Y values are regular scale values, and
// X values are chart fraction, ranging from 0 to 1
box.Location.CoordinateFrame = CoordType.XChartFractionYScale;
box.Fill = new Fill( Color.White, Color.FromArgb( 200, Color.LightGreen ), 45.0F );
box.ZOrder = ZOrder.F_BehindGrid;
box.IsClippedToChartRect = true;
myPane.GraphObjList.Add( box );
// Pretty it up
myPane.Title.Text = "Line Segments Colored by Value\nExtra Points Are Interpolated";
myPane.Title.FontSpec.Size = 18;
myPane.XAxis.Title.Text = "Time, seconds";
myPane.YAxis.Title.Text = "Potential, volts";
myPane.Legend.IsVisible = false;
myPane.Fill = new Fill( Color.WhiteSmoke, Color.Lavender, 0F );
myPane.Chart.Fill = new Fill( Color.FromArgb( 255, 255, 245 ),
Color.FromArgb( 255, 255, 190 ), 90F );
zgc.IsAntiAlias = true;
zgc.AxisChange();
}
// Basic curve test - Linear Axis
private void CreateGraph_BasicLinearSimple( ZedGraphControl z1 )
{
z1.IsEnableSelection = true;
Selection.Fill = new Fill( Color.Red );
Selection.Line.Color = Color.Red;
Selection.Line.DashOn = 1;
Selection.Line.DashOff = 1;
Selection.Line.Width = 3;
GraphPane myPane = z1.GraphPane;
PointPairList list1 = new PointPairList();
PointPairList list2 = new PointPairList();
const int count = 10;
for ( int i = 0; i < count; i++ )
{
double x = i;
double x2 = i + 0.4;
double y = 300.0 * ( 1.0 + Math.Sin( x * 0.2 ) );
double y2 = 250.0 * ( 1.0 + Math.Sin( x2 * 0.2 ) );
list1.Add( x, y, i / 36.0 );
list2.Add( x2, y2, i / 36.0 );
}
LineItem myCurve = myPane.AddCurve( "curve", list1, Color.Blue, SymbolType.Diamond );
LineItem myCurve2 = myPane.AddCurve( "curve 2", list2, Color.Green, SymbolType.Circle );
// Assume that list1 and list2 are existing PointPairLists for which you want the difference
// Create a new list that will hold the difference points
PointPairList diffList = new PointPairList();
// list1 will be the "Master" list that defines the actual X locations for the new list
// list1 also sets the range for the new list
foreach ( PointPair pt in list1 )
{
// Calculate a Y value for list2 based on linear interpolation at the current X value
// Note that you can also use list2.SplineInterpolateX() to use spline fitted data
// with a tension value
double y2 = list2.InterpolateX(pt.X);
// Add the new Point to the list taking the difference between the Y values
diffList.Add( pt.X, pt.Y - y2 );
}
LineItem diffCurve = myPane.AddCurve( "diff", diffList, Color.Red, SymbolType.Square );
myCurve.Line.IsAntiAlias = true;
/*
// Just a placeholder for the LineObj that will show the cursor location
LineObj cursorLine = new LineObj(Color.Black, 1.0, 0.0, 1.0, 1.0);
// Location will be actual X Scale value, but will value will be chart fraction from 0 to 1
cursorLine.Location.CoordinateFrame = CoordType.XScaleYChartFraction;
// Start with the cursor line hidden
cursorLine.IsVisible = false;
// Make the cursorline dashed
cursorLine.Line.DashOff = 5;
cursorLine.Line.DashOn = 1;
cursorLine.Line.Style = DashStyle.Custom;
// Add a tag so we can easily find the lineobj in MouseMove handler
cursorLine.Tag = "cursorLine";
myPane.GraphObjList.Add(cursorLine);
//myPane.XAxis.Scale.MajorStep = 1e-301;
*/
//BoxObj box = new BoxObj();
//myGraphObj.IsClippedToChartRect = true;
z1.AxisChange();
// z1.MouseMoveEvent += new ZedGraphControl.ZedMouseEventHandler(BasicLinear_MouseMoveEvent);
}
