#region Namespaces
using System;
#endregion 

namespace ScriptCode {
	/// <summary>
	/// Drawing scripts are used for drawing a visual object.
	/// 
	/// This script can be used in several ways:
	/// (1) It can be used on a chart by clicking the chart in order to set the drawing's anchor points.
	/// (2) It can be used from another script by having that script set the drawing's anchor points.
	/// </summary>
	public partial class MyDrawing : DrawingScriptBase // NEVER CHANGE THE CLASS NAME 
	{
#region Variables
		// The underlying symbol index for the drawing.
		private int _symbolIndex;
#endregion

#region OnInitialize
        /// <summary>
        /// This function is called when a new drawing instance is created.
        /// </summary>
        /// --------------------------------------------------------------------------------------------------
        /// THIS FUNCTION MUST ACCEPT THE SYMBOL INDEX PARAMETER AND SHOULD NOT ACCEPT ANY OTHER PARAMETERS.
        /// --------------------------------------------------------------------------------------------------
		/// <param name="symbolIndex" type="Symbol" default="">The underlying symbol index for the drawing.</param>
		public void OnInitialize(int symbolIndex) {
			// Initialize the drawing for the symbol to accept 2 anchor points. 		 
			DrawingInitialize(symbolIndex, 2);
			// Set the icon for the drawing tool.
			DrawingSetIcon("Quadrant Line");
			// Set the symbol index.
			_symbolIndex = symbolIndex;
		}
#endregion

#region OnChartSetup
		/// <summary>
		/// This function is used for setting up the drawing on the chart and registering its pens (see the DrawingRegisterPen function).
		/// </summary>
		public override void OnChartSetup() {
			// Register the pen with which to draw the quadrant lines.
			DrawingRegisterPen("Line Pen", new int[] {
				22 ,81, 238, 255
			}, C_DashStyle.SOLID, 2);
		}
#endregion

#region OnDraw
		/// <summary>
		/// This function is used to draw the drawing by setting all of its anchor points, lines and labels on a virtual canvas. 
		/// The canvas x-axis values are the date and time of the underlying symbol bars and its y-axis values are the symbol prices. 
		///
		/// The location of the drawing on the canvas is specified by the drawing anchor points, which can either be specified by 
		/// clicking on a chart or from another script (see the Drawing functions).
		/// </summary>
		public override void OnDraw() {
			// Get the X value of anchor point 0. 
			int x1 = DrawingAnchorPointBarShift(0);
			// Get the Y value of anchor point 0. 
			double y1 = 0;
			// Get the X value of anchor point 1. 
			int x2 = DrawingAnchorPointBarShift(1);
			// Get the Y value of anchor point 1. 
			double y2 = 0;

			// Find the maximum X.
			int maxX = Math.Max(x1, x2);
			// Find the minimum X.
			int minX = Math.Min(x1, x2);
			// The number of bars to include in the calculation. 
			int length = Math.Abs(x2 - x1);
			// Find the highest high and lowest low. 
			double highest = 0;
			double lowest = 10000000;
			// Iterate over all of the highs and all of the lows
			for (int i = 0; i < length; i++) {
				// Check whether a new high was found.
				if (DataHigh(minX + i) > highest) {
					highest = DataHigh(minX + i);
				}
				// Check whether a new low was found.
				if (DataLow(minX + i) < lowest) {
					lowest = DataLow(minX + i);
				}
			}

			int index = 0;
			// Calculate the range between the lines.
			double range = (highest - lowest) / 4;
			double y = lowest;
			// Draw the four ranges. 
			for (int i = 0; i <= 4; i++) {
				DrawingSetLine("Line Pen", minX, y, "", maxX, y, "");
				y += range;
			}
			// Fix the anchor point to position itself on the drawing.
			DrawingSetAnchorPoint(0, x1, lowest);
			// Fix the anchor point to position itself on the drawing.
			DrawingSetAnchorPoint(1, x2, lowest);
		}
#endregion
	}
}