From d2dea1b16ff29f6e45fca971290f94d4e0ed2467 Mon Sep 17 00:00:00 2001
From: Toby Vincent <tobyv13@gmail.com>
Date: Tue, 20 Apr 2021 13:34:37 -0500
Subject: added Canvas

---
 src/CS340.Plotter/Plot.cs | 36 ++++++++++++++++++++++++++++++------
 1 file changed, 30 insertions(+), 6 deletions(-)

(limited to 'src/CS340.Plotter/Plot.cs')

diff --git a/src/CS340.Plotter/Plot.cs b/src/CS340.Plotter/Plot.cs
index 7b274d8..f26978f 100644
--- a/src/CS340.Plotter/Plot.cs
+++ b/src/CS340.Plotter/Plot.cs
@@ -1,21 +1,45 @@
 using System;
-using System.Collections.Generic;
-using System.ComponentModel;
-using System.Data;
 using System.Drawing;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using System.Windows.Forms;
 
 namespace Plotter
 {
     public partial class Plot : Form
     {
+        Random rand = new Random();
         public Plot()
         {
             InitializeComponent();
+            Render();
+        }
+        void Render()
+        {
+            using var bmp = new Bitmap(Canvas.Width, Canvas.Height);
+            using var gfx = Graphics.FromImage(bmp);
+            using var pen = new Pen(Color.White);
+            // draw one thousand random white lines on a dark blue background
+            gfx.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
+            gfx.Clear(Color.Navy);
+            for (int i = 0; i < 1000; i++)
+            {
+                var pt1 = new Point(rand.Next(bmp.Width), rand.Next(bmp.Height));
+                var pt2 = new Point(rand.Next(bmp.Width), rand.Next(bmp.Height));
+                gfx.DrawLine(pen, pt1, pt2);
+            }
+
+            // copy the bitmap to the picturebox (double buffered)
+            Canvas.Image?.Dispose();
+            Canvas.Image = (Bitmap)bmp.Clone();
+        }
+
+        private void Canvas_SizeChanged(object sender, EventArgs e)
+        {
+            Render();
         }
 
+        private void Canvas_MouseDown(object sender, MouseEventArgs e)
+        {
+            Render();
+        }
     }
 }
-- 
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