Using Sho Visualization in WinForms from C#

Over on the Forum of Sho drobertson asked how to create a Contour Chart from C# within a form. I thought that would make good example code, so here it is:

 using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using ShoNS.Visualization;
using ShoNS.Array;
using ShoNS.MathFunc;

namespace testForm
{
    // Create a composite visualization by deriving from System.Windows.Forms.Form
    public class testForm : Form
    {
        private ShoChart ch;     // this will hold a Sho contour chart
        private Button button1;  // a button to update the contour chart
        private Label label1;    // a label to show how many times the button has been clicked
        private int num;         // a counter


        public testForm()
        {
            num = 0;
            InitializeComponent();
        }

        // code to generate (slightly random) data and create a contour chart from it
        // this method shows examples of calling into the Sho math libraries and the Sho viz libraries
        private ShoChart GenChart()
        {
            // first, create a range object that spans from 0 to pi, with 100 elements
            DoubleRange b = new DoubleRange(0.0, Math.PI);
            b.Count = 100;
            // now, create a row vector and fill it with random numbers
            DoubleArray x = new DoubleArray(1, 100);
            ArrayRandom.FillRandom<double>(x);
            // shift and scale the random numbers, and add sin(b) to it, to make a noisy sinusoid
            x = (x-0.5) * 0.1 + ArrayMath.Sin(b);
            // analogously, we'll make a noisy cosine row vector, 100 long
            DoubleArray y = new DoubleArray(1, 100);
            ArrayRandom.FillRandom<double>(y);
            y = (y-0.5) * 0.1 + ArrayMath.Cos(b);
            // now, make a matrix from the outer product of x and y.
            DoubleArray arr = x.T * y;
            // from the matrix, create a contour plot. Second argument says automatically choose the contours
            ShoChart ch = new ShoContourChart(arr, null);
            // all of the Sho viz classes inherit from control, so we can set WinForms control parameters
            // to size the contour plot and place it within the parent form.
            ch.AutoSize = true;
            ch.Location = new Point(25, 75);
            ch.Name = "ContourChart";
            ch.Size = new Size(375, 225);
            return ch;
        }

        // a button click will create a new contour chart with slightly randomized data
        private void buttonClick(object sender, EventArgs e)
        {
            SuspendLayout();
            // take the old contour plot out of the form
            Controls.Remove(ch);
            // generate a new one, and put it into the form
            ch = GenChart();
            Controls.Add(ch);
            // increment the label
            label1.Text = num.ToString();
            num++;
            // relayout and refresh the form
            ResumeLayout(false);
            PerformLayout();
            Refresh();
        }

        private void InitializeComponent()
        {
            // code derived from form wizard: create a button and label
            button1 = new Button();
            label1 = new Label();

            SuspendLayout();

            // position and parameterize the button
            button1.Location = new Point(175, 50);
            button1.Name = "button1";
            button1.Size = new Size(100, 20);
            button1.TabIndex = 0;
            button1.Text = "click me";
            button1.UseVisualStyleBackColor = true;
            button1.Click += new EventHandler(buttonClick); // hook up button click handler

            // position and parameterize the label
            label1.AutoSize = true;
            label1.Location = new Point(215, 25);
            label1.Name = "label1";
            label1.Size = new Size(50, 20);
            label1.Text = num.ToString();
            label1.TextAlign = ContentAlignment.MiddleCenter;
            num++;

            // create a new contour plot
            ch = GenChart();

            AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            ClientSize = new System.Drawing.Size(425, 325);
            Controls.Add(label1);
            Controls.Add(button1);
            Controls.Add(ch);
            Name = "Form1";
            Text = "Example showing ShoChart embedded in WinForm using C#";

            // layout the controls: now we're ready to start the message pump
            ResumeLayout(false);
            PerformLayout();
        }
    }
}

From inside of Sho, you can test this by dynamically loading the dll, and running the form in its own thread (made easy with ShoThread):

 >>> load('testForm.dll')
<Assembly testForm, Version=1.0.0.0, Culture=neutral, PublicKeyToken=...>
>>> from testForm import *
>>> t = ShoThread(lambda : System.Windows.Forms.Application.Run(testForm()))
>>> t.Start()