Canvas/DrawTools/SnapPoints.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace Canvas
{
	class SnapPointBase : ISnapPoint
	{
		protected UnitPoint		m_snappoint;
		protected RectangleF	m_boundingRect;
		protected IDrawObject	m_owner;
		public IDrawObject Owner
		{
			get { return m_owner; }
		}
		public SnapPointBase(ICanvas canvas, IDrawObject owner, UnitPoint snappoint)
		{
			m_owner = owner;
			m_snappoint = snappoint;
			float size = (float)canvas.ToUnit(14);
			m_boundingRect.X = (float)(snappoint.X - size / 2);
			m_boundingRect.Y = (float)(snappoint.Y - size / 2);
			m_boundingRect.Width = size;
			m_boundingRect.Height = size;
		}
		#region ISnapPoint Members
		public virtual UnitPoint SnapPoint
		{
			get { return m_snappoint; }
		}
		public virtual RectangleF BoundingRect
		{
			get { return m_boundingRect; }
		}
		public virtual void Draw(ICanvas canvas)
		{
		}
		#endregion

		protected void DrawPoint(ICanvas canvas, Pen pen, Brush fillBrush)
		{
			Rectangle screenrect = ScreenUtils.ConvertRect(ScreenUtils.ToScreenNormalized(canvas, m_boundingRect));
			canvas.Graphics.DrawRectangle(pen, screenrect);
			screenrect.X++;
			screenrect.Y++;
			screenrect.Width--;
			screenrect.Height--;
			if (fillBrush != null)
				canvas.Graphics.FillRectangle(fillBrush, screenrect);
		}
	}
	class GridSnapPoint : SnapPointBase
	{
		public GridSnapPoint(ICanvas canvas, UnitPoint snappoint)
			: base(canvas, null, snappoint)
		{
		}
		#region ISnapPoint Members