Sick Drawing Stuff

gistfile1.cs

using System;
using System.Drawing;
using System.Windows.Forms;

namespace DrawingStuff
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            comboBox1.SelectedIndex = 0;
        }

        Random rand = new Random();

        private void button1_Click(object sender, EventArgs e)
        {
            Graphics g = panel1.CreateGraphics();
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            if (comboBox1.SelectedIndex == 0)
                DrawLineFlower(g, new Point((int)numericUpDown3.Value, (int)numericUpDown4.Value), (int)numericUpDown1.Value, (int)numericUpDown2.Value);
            else
                DrawColorFlower(g, new Point((int)numericUpDown3.Value, (int)numericUpDown4.Value), (int)numericUpDown1.Value, (int)numericUpDown2.Value);
        }

        void DrawLineFlower(Graphics g, Point start, int petals, int length = 50)
        {
            double offset = Math.PI * (rand.Next(0, 200) / 100f);
            for (int i = 1; i <= petals; i++)
                DrawLine(g, start, length, (i * (Math.PI * 2) + offset) / petals);
        }

        void DrawColorFlower(Graphics g, Point start, int petals, int length = 50)
        {
            double offset = Math.PI * (rand.Next(0, 200) / 100f);
            for (int i = 1; i <= petals; i++)
                DrawTriangle(g, start, length, (i * (Math.PI * 2) + offset) / petals, (2 * Math.PI) / petals, ((i & 1) == 1) ? button3.BackColor : button4.BackColor);
        }

        void DrawTriangle(Graphics g, Point start, int length, double angleA, double angleB, Color c)
        {
            Point[] points = { start, GetEndPoint(start, length, angleA), GetEndPoint(start, length, angleA + angleB) };
            Brush b = new SolidBrush(c);
            g.FillPolygon(b, points);
        }

        void DrawLine(Graphics g, Point start, int length, double angle)
        {
            Pen p = new Pen(Color.Black);
            g.DrawLine(p, start, GetEndPoint(start, length, angle));
        }

        Point GetEndPoint(Point start, int length, double angle)
        {
            return new Point((int)(start.X + length * Math.Cos(angle)), (int)(start.Y + length * Math.Sin(angle)));
        }

        void DrawLine(Graphics g, Point start, int length, int angle)
        {
            DrawLine(g, start, length, DegreeToRadians(angle));
        }

        double DegreeToRadians(int degree)
        {
            return degree * (Math.PI / 180);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Graphics g = panel1.CreateGraphics();
            g.Clear(panel1.BackColor);
        }

        private void panel1_Click(object sender, EventArgs e)
        {
            Point cursorPos = panel1.PointToClient(Cursor.Position);
            Graphics g = panel1.CreateGraphics();
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            if (comboBox1.SelectedIndex == 0)
                DrawLineFlower(g, cursorPos, (int)numericUpDown1.Value, (int)numericUpDown2.Value);
            else
                DrawColorFlower(g, cursorPos, (int)numericUpDown1.Value, (int)numericUpDown2.Value); ;
        }

        private void button3_Click(object sender, EventArgs e)
        {
            ColorDialog dialog = new ColorDialog();
            dialog.ShowDialog();
            button3.BackColor = dialog.Color;
        }

        private void button4_Click(object sender, EventArgs e)
        {
            ColorDialog dialog = new ColorDialog();
            dialog.ShowDialog();
            button4.BackColor = dialog.Color;
        }
    }
}