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POHorrible Flickering drawing in C#
 

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  1. POHorrible Flickering drawing in C#
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    <p>Anyone have any suggestions on how to stop this drawing from flickering? I have tried each double buffering solution, stopped using .CreateGraphics, moved all of my functions all over the place, nothing has worked. </p> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Drawing.Drawing2D; using System.Linq; using System.Text; using System.Windows.Forms; using System.Threading; namespace Math { public partial class Form1 : Form { static Random rand = new Random(); ProblemBox[] problems = new ProblemBox[20]; #region Types public enum Type { Basic, Algebric, Triginomic } public class Problem { public Type type; public String problem, answer; public Boolean isTrue; public Problem(Type type, String problem, String answer, Boolean isTrue) { this.type = type; this.problem = problem; this.answer = answer; this.isTrue = isTrue; } } class ProblemBox { public Rectangle rect; public Problem problem; public ProblemBox(Problem problem) { rect = new Rectangle(0, 309, 244, 30); this.problem = problem; } public void move() { rect.Y -= 1; } public void draw(Graphics g) { g.FillRectangle(Brushes.DarkGray, rect); g.DrawString(problem.problem + "=" + problem.answer, new Font("Times New Roman", 12.0f), Brushes.DarkBlue, new PointF(rect.X + 5, rect.Y + 5)); } } #endregion public Problem CreateProblem() { char op = '+'; int a = rand.Next(20), b = rand.Next(20), c; switch (rand.Next(4)) { case 2: c = a - b; op = '-'; break; case 3: c = a * b; op = '*'; break; case 4: c = a / b; op = '/'; break; default: c = a + b; op = '+'; break; } bool isTrue = rand.Next(2) == 1; if (!isTrue) { c += 1 + (10 - rand.Next(20)); } return new Problem(Type.Basic, String.Concat(a + ""+op +""+ b), String.Concat(c), isTrue); } public Form1() { InitializeComponent(); SetStyle(ControlStyles.OptimizedDoubleBuffer, true); problems[0] = new ProblemBox(CreateProblem()); } private void panel1_Paint(object sender, PaintEventArgs e)//Tick { ProblemBox temp = null; if (problems[0].rect.Y &lt; 279) { temp = new ProblemBox(CreateProblem()); } for (int i = 0; i &lt; 20; i++) { if (temp != null) { ProblemBox temp2 = problems[i]; problems[i] = temp; temp = temp2; } if (problems[i] != null) { problems[i].move(); problems[i].draw(e.Graphics); } } Thread.Sleep(20); DrawingPanel.Invalidate(); } } } </code></pre>
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    1. COHave you tried using the PictureBox instead of a Panel. Just an idea, since I remember it brought less issues.
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