UltimateZoneBuilder/Source/Core/GZBuilder/Controls/AngleControl.cs

//Downloaded from
//Visual C# Kicks - http://vckicks.110mb.com
//The Code Project - http://www.codeproject.com

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Data;
using System.Text;
using System.Windows.Forms;

namespace CodeImp.DoomBuilder.GZBuilder.Controls
{
	public partial class AngleControl : UserControl
	{
		private int angle;

		private Rectangle drawRegion;
		private Point origin;

		public AngleControl()
		{
			InitializeComponent();
			this.DoubleBuffered = true;
		}

		private void AngleSelector_Load(object sender, EventArgs e)
		{
			setDrawRegion();
		}

		private void AngleSelector_SizeChanged(object sender, EventArgs e)
		{
			this.Height = this.Width; //Keep it a square
			setDrawRegion();
		}

		private void setDrawRegion()
		{
			drawRegion = new Rectangle(0, 0, this.Width, this.Height);
			drawRegion.X += 2;
			drawRegion.Y += 2;
			drawRegion.Width -= 4;
			drawRegion.Height -= 4;

			int offset = 2;
			origin = new Point(drawRegion.Width / 2 + offset, drawRegion.Height / 2 + offset);

			this.Refresh();
		}

		public int Angle
		{
			get { return angle; }
			set
			{
				angle = value;
				this.Refresh();
			}
		}

		public delegate void AngleChangedDelegate();
		public event AngleChangedDelegate AngleChanged;

		private PointF DegreesToXY(float degrees, float radius, Point origin)
		{
			PointF xy = new PointF();
			double radians = degrees * Math.PI / 180.0;

			xy.X = (float)Math.Cos(radians) * radius + origin.X;
			xy.Y = (float)Math.Sin(-radians) * radius + origin.Y;

			return xy;
		}

		private float XYToDegrees(Point xy, Point origin)
		{
			double angle = 0.0;

			if (xy.Y < origin.Y)
			{
				if (xy.X > origin.X)
				{
					angle = (double)(xy.X - origin.X) / (double)(origin.Y - xy.Y);
					angle = Math.Atan(angle);
					angle = 90.0 - angle * 180.0 / Math.PI;
				}
				else if (xy.X < origin.X)
				{
					angle = (double)(origin.X - xy.X) / (double)(origin.Y - xy.Y);
					angle = Math.Atan(-angle);
					angle = 90.0 - angle * 180.0 / Math.PI;
				}
			}
			else if (xy.Y > origin.Y)
			{
				if (xy.X > origin.X)
				{
					angle = (double)(xy.X - origin.X) / (double)(xy.Y - origin.Y);
					angle = Math.Atan(-angle);
					angle = 270.0 - angle * 180.0 / Math.PI;
				}
				else if (xy.X < origin.X)
				{
					angle = (double)(origin.X - xy.X) / (double)(xy.Y - origin.Y);
					angle = Math.Atan(angle);
					angle = 270.0 - angle * 180.0 / Math.PI;
				}
			}

			if (angle > 180) angle -= 360; //Optional. Keeps values between -180 and 180
			return (float)angle;
		}

		protected override void OnPaint(PaintEventArgs e)
		{
			Graphics g = e.Graphics;

			Pen outline = new Pen(Color.FromArgb(86, 103, 141), 2.0f);
			SolidBrush fill = new SolidBrush(Color.FromArgb(90, 255, 255, 255));

			PointF anglePoint = DegreesToXY(angle, origin.X - 2, origin);
			Rectangle originSquare = new Rectangle(origin.X - 1, origin.Y - 1, 3, 3);

			//Draw
			g.SmoothingMode = SmoothingMode.AntiAlias;
			g.DrawEllipse(outline, drawRegion);
			g.FillEllipse(fill, drawRegion);
			g.DrawLine(Pens.Black, origin, anglePoint);

			g.SmoothingMode = SmoothingMode.HighSpeed; //Make the square edges sharp
			g.FillRectangle(Brushes.Black, originSquare);

			fill.Dispose();
			outline.Dispose();

			base.OnPaint(e);
		}

		private void AngleSelector_MouseDown(object sender, MouseEventArgs e)
		{
			int thisAngle = findNearestAngle(new Point(e.X, e.Y));

			if (thisAngle != -1)
			{
				this.Angle = thisAngle;
				if(!this.DesignMode && AngleChanged != null)
					AngleChanged(); //Raise event
				this.Refresh();
			}
		}

		private void AngleSelector_MouseMove(object sender, MouseEventArgs e)
		{
			if (e.Button == MouseButtons.Left || e.Button == MouseButtons.Right)
			{
				int thisAngle = findNearestAngle(new Point(e.X, e.Y));

				if (thisAngle != -1)
				{
					this.Angle = thisAngle;
					if(!this.DesignMode && AngleChanged != null)
						AngleChanged(); //Raise event
					this.Refresh();
				}
			}
		}

		private int findNearestAngle(Point mouseXY)
		{
			int thisAngle = (int)XYToDegrees(mouseXY, origin);
			if (thisAngle != 0)
				return thisAngle;
			else
				return -1;
		}
	}
}