using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Windows.Forms;
using AGVNavigationCore.Models;
using AGVNavigationCore.PathFinding;

namespace AGVNavigationCore.Controls
{
    public partial class UnifiedAGVCanvas
    {
        #region Paint Events

        private void UnifiedAGVCanvas_Paint(object sender, PaintEventArgs e)
        {
            var g = e.Graphics;
            g.SmoothingMode = SmoothingMode.AntiAlias;
            g.InterpolationMode = InterpolationMode.High;

            // 변환 행렬 설정 (줌 및 팬)
            var transform = new Matrix();
            transform.Scale(_zoomFactor, _zoomFactor);
            transform.Translate(_panOffset.X, _panOffset.Y);
            g.Transform = transform;

            try
            {
                // 그리드 그리기
                if (_showGrid)
                {
                    DrawGrid(g);
                }

                // 노드 연결선 그리기
                DrawConnections(g);

                // 경로 그리기
                DrawPaths(g);

                // 노드 그리기
                DrawNodes(g);

                // AGV 그리기
                DrawAGVs(g);

                // 임시 연결선 그리기 (편집 모드)
                if (_canvasMode == CanvasMode.Edit && _isConnectionMode)
                {
                    DrawTemporaryConnection(g);
                }
            }
            finally
            {
                g.Transform = new Matrix(); // 변환 행렬 리셋
            }

            // UI 정보 그리기 (변환 없이)
            DrawUIInfo(g);
        }

        private void DrawGrid(Graphics g)
        {
            if (!_showGrid) return;

            var bounds = GetVisibleBounds();
            var gridSize = (int)(GRID_SIZE * _zoomFactor);

            if (gridSize < 5) return; // 너무 작으면 그리지 않음

            for (int x = bounds.Left; x < bounds.Right; x += GRID_SIZE)
            {
                if (x % (GRID_SIZE * 5) == 0)
                    g.DrawLine(new Pen(Color.Gray, 1), x, bounds.Top, x, bounds.Bottom);
                else
                    g.DrawLine(_gridPen, x, bounds.Top, x, bounds.Bottom);
            }

            for (int y = bounds.Top; y < bounds.Bottom; y += GRID_SIZE)
            {
                if (y % (GRID_SIZE * 5) == 0)
                    g.DrawLine(new Pen(Color.Gray, 1), bounds.Left, y, bounds.Right, y);
                else
                    g.DrawLine(_gridPen, bounds.Left, y, bounds.Right, y);
            }
        }

        private void DrawConnections(Graphics g)
        {
            if (_nodes == null) return;

            foreach (var node in _nodes)
            {
                if (node.ConnectedNodes == null) continue;

                foreach (var connectedNodeId in node.ConnectedNodes)
                {
                    var targetNode = _nodes.FirstOrDefault(n => n.NodeId == connectedNodeId);
                    if (targetNode == null) continue;

                    DrawConnection(g, node, targetNode);
                }
            }
        }

        private void DrawConnection(Graphics g, MapNode fromNode, MapNode toNode)
        {
            var startPoint = fromNode.Position;
            var endPoint = toNode.Position;

            // 연결선만 그리기 (단순한 도로 연결, 방향성 없음)
            g.DrawLine(_connectionPen, startPoint, endPoint);
        }

        private void DrawDirectionArrow(Graphics g, Point point, double angle, AgvDirection direction)
        {
            var arrowSize = CONNECTION_ARROW_SIZE;
            var arrowAngle = Math.PI / 6; // 30도

            var cos = Math.Cos(angle);
            var sin = Math.Sin(angle);

            var arrowPoint1 = new Point(
                (int)(point.X - arrowSize * Math.Cos(angle - arrowAngle)),
                (int)(point.Y - arrowSize * Math.Sin(angle - arrowAngle))
            );

            var arrowPoint2 = new Point(
                (int)(point.X - arrowSize * Math.Cos(angle + arrowAngle)),
                (int)(point.Y - arrowSize * Math.Sin(angle + arrowAngle))
            );

            var arrowColor = direction == AgvDirection.Forward ? Color.Blue : Color.Red;
            var arrowPen = new Pen(arrowColor, 2);

            g.DrawLine(arrowPen, point, arrowPoint1);
            g.DrawLine(arrowPen, point, arrowPoint2);

            arrowPen.Dispose();
        }

        private void DrawPaths(Graphics g)
        {
            // 모든 경로 그리기
            if (_allPaths != null)
            {
                foreach (var path in _allPaths)
                {
                    DrawPath(g, path, Color.LightBlue);
                }
            }

            // 현재 선택된 경로 그리기
            if (_currentPath != null)
            {
                DrawPath(g, _currentPath, Color.Purple);
            }
        }

        private void DrawPath(Graphics g, PathResult path, Color color)
        {
            if (path?.Path == null || path.Path.Count < 2) return;

            var pathPen = new Pen(color, 4) { DashStyle = DashStyle.Dash };

            for (int i = 0; i < path.Path.Count - 1; i++)
            {
                var currentNodeId = path.Path[i];
                var nextNodeId = path.Path[i + 1];

                var currentNode = _nodes?.FirstOrDefault(n => n.NodeId == currentNodeId);
                var nextNode = _nodes?.FirstOrDefault(n => n.NodeId == nextNodeId);

                if (currentNode != null && nextNode != null)
                {
                    // 경로 선 그리기
                    g.DrawLine(pathPen, currentNode.Position, nextNode.Position);
                    
                    // 경로 방향 표시 (계산된 경로의 경우에만 방향 화살표 표시)
                    var midPoint = new Point(
                        (currentNode.Position.X + nextNode.Position.X) / 2,
                        (currentNode.Position.Y + nextNode.Position.Y) / 2
                    );

                    var angle = Math.Atan2(nextNode.Position.Y - currentNode.Position.Y, 
                                         nextNode.Position.X - currentNode.Position.X);
                    DrawDirectionArrow(g, midPoint, angle, AgvDirection.Forward);
                }
            }

            pathPen.Dispose();
        }

        private void DrawNodes(Graphics g)
        {
            if (_nodes == null) return;

            foreach (var node in _nodes)
            {
                DrawNode(g, node);
            }
        }

        private void DrawNode(Graphics g, MapNode node)
        {
            switch (node.Type)
            {
                case NodeType.Label:
                    DrawLabelNode(g, node);
                    break;
                case NodeType.Image:
                    DrawImageNode(g, node);
                    break;
                default:
                    DrawCircularNode(g, node);
                    break;
            }
        }

        private void DrawCircularNode(Graphics g, MapNode node)
        {
            var brush = GetNodeBrush(node);
            
            switch (node.Type)
            {
                case NodeType.Docking:
                    DrawPentagonNode(g, node, brush);
                    break;
                case NodeType.Charging:
                    DrawTriangleNode(g, node, brush);
                    break;
                default:
                    DrawCircleNode(g, node, brush);
                    break;
            }
        }

        private void DrawCircleNode(Graphics g, MapNode node, Brush brush)
        {
            var rect = new Rectangle(
                node.Position.X - NODE_RADIUS,
                node.Position.Y - NODE_RADIUS,
                NODE_SIZE,
                NODE_SIZE
            );

            // 노드 그리기
            g.FillEllipse(brush, rect);
            g.DrawEllipse(Pens.Black, rect);

            // 선택된 노드 강조
            if (node == _selectedNode)
            {
                g.DrawEllipse(_selectedNodePen, rect);
            }

            // 호버된 노드 강조
            if (node == _hoveredNode)
            {
                var hoverRect = new Rectangle(rect.X - 2, rect.Y - 2, rect.Width + 4, rect.Height + 4);
                g.DrawEllipse(new Pen(Color.Orange, 2), hoverRect);
            }

            DrawNodeLabel(g, node);
        }

        private void DrawPentagonNode(Graphics g, MapNode node, Brush brush)
        {
            var radius = NODE_RADIUS;
            var center = node.Position;
            
            // 5각형 꼭짓점 계산 (위쪽부터 시계방향)
            var points = new Point[5];
            for (int i = 0; i < 5; i++)
            {
                var angle = (Math.PI * 2 * i / 5) - Math.PI / 2; // -90도부터 시작 (위쪽)
                points[i] = new Point(
                    (int)(center.X + radius * Math.Cos(angle)),
                    (int)(center.Y + radius * Math.Sin(angle))
                );
            }

            // 5각형 그리기
            g.FillPolygon(brush, points);
            g.DrawPolygon(Pens.Black, points);

            // 선택된 노드 강조
            if (node == _selectedNode)
            {
                g.DrawPolygon(_selectedNodePen, points);
            }

            // 호버된 노드 강조
            if (node == _hoveredNode)
            {
                // 확장된 5각형 계산
                var hoverPoints = new Point[5];
                for (int i = 0; i < 5; i++)
                {
                    var angle = (Math.PI * 2 * i / 5) - Math.PI / 2;
                    hoverPoints[i] = new Point(
                        (int)(center.X + (radius + 3) * Math.Cos(angle)),
                        (int)(center.Y + (radius + 3) * Math.Sin(angle))
                    );
                }
                g.DrawPolygon(new Pen(Color.Orange, 2), hoverPoints);
            }

            DrawNodeLabel(g, node);
        }

        private void DrawTriangleNode(Graphics g, MapNode node, Brush brush)
        {
            var radius = NODE_RADIUS;
            var center = node.Position;
            
            // 삼각형 꼭짓점 계산 (위쪽 꼭짓점부터 시계방향)
            var points = new Point[3];
            for (int i = 0; i < 3; i++)
            {
                var angle = (Math.PI * 2 * i / 3) - Math.PI / 2; // -90도부터 시작 (위쪽)
                points[i] = new Point(
                    (int)(center.X + radius * Math.Cos(angle)),
                    (int)(center.Y + radius * Math.Sin(angle))
                );
            }

            // 삼각형 그리기
            g.FillPolygon(brush, points);
            g.DrawPolygon(Pens.Black, points);

            // 선택된 노드 강조
            if (node == _selectedNode)
            {
                g.DrawPolygon(_selectedNodePen, points);
            }

            // 호버된 노드 강조
            if (node == _hoveredNode)
            {
                // 확장된 삼각형 계산
                var hoverPoints = new Point[3];
                for (int i = 0; i < 3; i++)
                {
                    var angle = (Math.PI * 2 * i / 3) - Math.PI / 2;
                    hoverPoints[i] = new Point(
                        (int)(center.X + (radius + 3) * Math.Cos(angle)),
                        (int)(center.Y + (radius + 3) * Math.Sin(angle))
                    );
                }
                g.DrawPolygon(new Pen(Color.Orange, 2), hoverPoints);
            }

            DrawNodeLabel(g, node);
        }

        private void DrawNodeLabel(Graphics g, MapNode node)
        {
            string displayText;
            Color textColor;
            string descriptionText;
            
            // 위쪽에 표시할 설명 (노드의 Description 속성)
            descriptionText = string.IsNullOrEmpty(node.Description) ? "" : node.Description;
            
            // 아래쪽에 표시할 값 (RFID 우선, 없으면 노드ID)
            if (node.HasRfid())
            {
                // RFID가 있는 경우: 순수 RFID 값만 표시 (진한 색상)
                displayText = node.RfidId;
                textColor = Color.Black;
            }
            else
            {
                // RFID가 없는 경우: 노드 ID 표시 (연한 색상)
                displayText = node.NodeId;
                textColor = Color.Gray;
            }

            var font = new Font("Arial", 8, FontStyle.Bold);
            var descFont = new Font("Arial", 6, FontStyle.Regular);
            
            // 메인 텍스트 크기 측정
            var textSize = g.MeasureString(displayText, font);
            var descSize = g.MeasureString(descriptionText, descFont);
            
            // 설명 텍스트 위치 (노드 위쪽)
            var descPoint = new Point(
                (int)(node.Position.X - descSize.Width / 2),
                (int)(node.Position.Y - NODE_RADIUS - descSize.Height - 2)
            );
            
            // 메인 텍스트 위치 (노드 아래쪽)
            var textPoint = new Point(
                (int)(node.Position.X - textSize.Width / 2),
                (int)(node.Position.Y + NODE_RADIUS + 2)
            );

            // 설명 텍스트 그리기 (설명이 있는 경우에만)
            if (!string.IsNullOrEmpty(descriptionText))
            {
                using (var descBrush = new SolidBrush(Color.FromArgb(120, Color.Black)))
                {
                    g.DrawString(descriptionText, descFont, descBrush, descPoint);
                }
            }
            
            // 메인 텍스트 그리기
            using (var textBrush = new SolidBrush(textColor))
            {
                g.DrawString(displayText, font, textBrush, textPoint);
            }
            
            font.Dispose();
            descFont.Dispose();
        }

        private void DrawLabelNode(Graphics g, MapNode node)
        {
            var text = string.IsNullOrEmpty(node.LabelText) ? node.NodeId : node.LabelText;
            
            // 폰트 설정
            var font = new Font(node.FontFamily, node.FontSize, node.FontStyle);
            var textBrush = new SolidBrush(node.ForeColor);
            
            // 텍스트 크기 측정
            var textSize = g.MeasureString(text, font);
            var textPoint = new Point(
                (int)(node.Position.X - textSize.Width / 2),
                (int)(node.Position.Y - textSize.Height / 2)
            );

            // 배경 그리기 (설정된 경우)
            if (node.ShowBackground)
            {
                var backgroundBrush = new SolidBrush(node.BackColor);
                var backgroundRect = new Rectangle(
                    textPoint.X - 2,
                    textPoint.Y - 2,
                    (int)textSize.Width + 4,
                    (int)textSize.Height + 4
                );
                g.FillRectangle(backgroundBrush, backgroundRect);
                g.DrawRectangle(Pens.Black, backgroundRect);
                backgroundBrush.Dispose();
            }

            // 텍스트 그리기
            g.DrawString(text, font, textBrush, textPoint);

            // 선택된 노드 강조
            if (node == _selectedNode)
            {
                var selectionRect = new Rectangle(
                    textPoint.X - 4,
                    textPoint.Y - 4,
                    (int)textSize.Width + 8,
                    (int)textSize.Height + 8
                );
                g.DrawRectangle(_selectedNodePen, selectionRect);
            }

            // 호버된 노드 강조
            if (node == _hoveredNode)
            {
                var hoverRect = new Rectangle(
                    textPoint.X - 6,
                    textPoint.Y - 6,
                    (int)textSize.Width + 12,
                    (int)textSize.Height + 12
                );
                g.DrawRectangle(new Pen(Color.Orange, 2), hoverRect);
            }

            font.Dispose();
            textBrush.Dispose();
        }

        private void DrawImageNode(Graphics g, MapNode node)
        {
            // 이미지 로드 (필요시)
            if (node.LoadedImage == null && !string.IsNullOrEmpty(node.ImagePath))
            {
                node.LoadImage();
            }

            if (node.LoadedImage != null)
            {
                // 실제 표시 크기 계산
                var displaySize = node.GetDisplaySize();
                if (displaySize.IsEmpty)
                    displaySize = new Size(50, 50); // 기본 크기

                var imageRect = new Rectangle(
                    node.Position.X - displaySize.Width / 2,
                    node.Position.Y - displaySize.Height / 2,
                    displaySize.Width,
                    displaySize.Height
                );

                // 회전이 있는 경우
                if (node.Rotation != 0)
                {
                    var oldTransform = g.Transform;
                    g.TranslateTransform(node.Position.X, node.Position.Y);
                    g.RotateTransform(node.Rotation);
                    g.TranslateTransform(-node.Position.X, -node.Position.Y);
                    
                    // 투명도 적용하여 이미지 그리기
                    if (node.Opacity < 1.0f)
                    {
                        var imageAttributes = new System.Drawing.Imaging.ImageAttributes();
                        var colorMatrix = new System.Drawing.Imaging.ColorMatrix();
                        colorMatrix.Matrix33 = node.Opacity;
                        imageAttributes.SetColorMatrix(colorMatrix, System.Drawing.Imaging.ColorMatrixFlag.Default,
                            System.Drawing.Imaging.ColorAdjustType.Bitmap);
                        g.DrawImage(node.LoadedImage, imageRect, 0, 0, node.LoadedImage.Width, node.LoadedImage.Height,
                            GraphicsUnit.Pixel, imageAttributes);
                        imageAttributes.Dispose();
                    }
                    else
                    {
                        g.DrawImage(node.LoadedImage, imageRect);
                    }
                    
                    g.Transform = oldTransform;
                }
                else
                {
                    // 투명도 적용하여 이미지 그리기
                    if (node.Opacity < 1.0f)
                    {
                        var imageAttributes = new System.Drawing.Imaging.ImageAttributes();
                        var colorMatrix = new System.Drawing.Imaging.ColorMatrix();
                        colorMatrix.Matrix33 = node.Opacity;
                        imageAttributes.SetColorMatrix(colorMatrix, System.Drawing.Imaging.ColorMatrixFlag.Default,
                            System.Drawing.Imaging.ColorAdjustType.Bitmap);
                        g.DrawImage(node.LoadedImage, imageRect, 0, 0, node.LoadedImage.Width, node.LoadedImage.Height,
                            GraphicsUnit.Pixel, imageAttributes);
                        imageAttributes.Dispose();
                    }
                    else
                    {
                        g.DrawImage(node.LoadedImage, imageRect);
                    }
                }

                // 선택된 노드 강조
                if (node == _selectedNode)
                {
                    g.DrawRectangle(_selectedNodePen, imageRect);
                }

                // 호버된 노드 강조
                if (node == _hoveredNode)
                {
                    var hoverRect = new Rectangle(imageRect.X - 2, imageRect.Y - 2, imageRect.Width + 4, imageRect.Height + 4);
                    g.DrawRectangle(new Pen(Color.Orange, 2), hoverRect);
                }
               
            }
            else
            {
                // 이미지가 없는 경우 기본 사각형으로 표시
                var rect = new Rectangle(
                    node.Position.X - 25,
                    node.Position.Y - 25,
                    50,
                    50
                );

                g.FillRectangle(Brushes.LightGray, rect);
                g.DrawRectangle(Pens.Black, rect);

                // "이미지 없음" 텍스트
                var font = new Font("Arial", 8);
                var text = "No Image";
                var textSize = g.MeasureString(text, font);
                var textPoint = new Point(
                    (int)(node.Position.X - textSize.Width / 2),
                    (int)(node.Position.Y - textSize.Height / 2)
                );
                g.DrawString(text, font, Brushes.Black, textPoint);
                font.Dispose();

                // 선택된 노드 강조
                if (node == _selectedNode)
                {
                    g.DrawRectangle(_selectedNodePen, rect);
                }

                // 호버된 노드 강조
                if (node == _hoveredNode)
                {
                    var hoverRect = new Rectangle(rect.X - 2, rect.Y - 2, rect.Width + 4, rect.Height + 4);
                    g.DrawRectangle(new Pen(Color.Orange, 2), hoverRect);
                }
            }
        }

        private Brush GetNodeBrush(MapNode node)
        {
            switch (node.Type)
            {
                case NodeType.Normal:
                    return _normalNodeBrush;
                case NodeType.Rotation:
                    return _rotationNodeBrush;
                case NodeType.Docking:
                    return _dockingNodeBrush;
                case NodeType.Charging:
                    return _chargingNodeBrush;
                case NodeType.Label:
                    return new SolidBrush(Color.Purple);
                case NodeType.Image:
                    return new SolidBrush(Color.Brown);
                default:
                    return _normalNodeBrush;
            }
        }

        private void DrawAGVs(Graphics g)
        {
            if (_agvList == null) return;

            foreach (var agv in _agvList)
            {
                if (_agvPositions.ContainsKey(agv.AgvId))
                {
                    DrawAGV(g, agv);
                }
            }
        }

        private void DrawAGV(Graphics g, IAGV agv)
        {
            if (!_agvPositions.ContainsKey(agv.AgvId)) return;

            var position = _agvPositions[agv.AgvId];
            var direction = _agvDirections.ContainsKey(agv.AgvId) ? _agvDirections[agv.AgvId] : AgvDirection.Forward;
            var state = _agvStates.ContainsKey(agv.AgvId) ? _agvStates[agv.AgvId] : AGVState.Idle;

            // AGV 색상 결정
            var brush = GetAGVBrush(state);
            
            // AGV 사각형 그리기
            var rect = new Rectangle(
                position.X - AGV_SIZE / 2,
                position.Y - AGV_SIZE / 2,
                AGV_SIZE,
                AGV_SIZE
            );

            g.FillRectangle(brush, rect);
            g.DrawRectangle(_agvPen, rect);

            // 방향 표시 (화살표)
            DrawAGVDirection(g, position, direction);

            // AGV ID 표시
            var font = new Font("Arial", 10, FontStyle.Bold);
            var textSize = g.MeasureString(agv.AgvId, font);
            var textPoint = new Point(
                (int)(position.X - textSize.Width / 2),
                (int)(position.Y - AGV_SIZE / 2 - textSize.Height - 2)
            );

            g.DrawString(agv.AgvId, font, Brushes.Black, textPoint);

            // 배터리 레벨 표시
            var batteryText = $"{agv.BatteryLevel:F0}%";
            var batterySize = g.MeasureString(batteryText, font);
            var batteryPoint = new Point(
                (int)(position.X - batterySize.Width / 2),
                (int)(position.Y + AGV_SIZE / 2 + 2)
            );

            g.DrawString(batteryText, font, Brushes.Black, batteryPoint);
            font.Dispose();
        }

        private Brush GetAGVBrush(AGVState state)
        {
            switch (state)
            {
                case AGVState.Idle:
                    return Brushes.LightGray;
                case AGVState.Moving:
                    return Brushes.LightGreen;
                case AGVState.Rotating:
                    return Brushes.Yellow;
                case AGVState.Docking:
                    return Brushes.Orange;
                case AGVState.Charging:
                    return Brushes.Blue;
                case AGVState.Error:
                    return Brushes.Red;
                default:
                    return Brushes.LightGray;
            }
        }

        private void DrawAGVDirection(Graphics g, Point position, AgvDirection direction)
        {
            var arrowSize = 10;
            Point[] arrowPoints = null;

            switch (direction)
            {
                case AgvDirection.Forward:
                    arrowPoints = new Point[]
                    {
                        new Point(position.X + arrowSize, position.Y),
                        new Point(position.X - arrowSize/2, position.Y - arrowSize/2),
                        new Point(position.X - arrowSize/2, position.Y + arrowSize/2)
                    };
                    break;
                case AgvDirection.Backward:
                    arrowPoints = new Point[]
                    {
                        new Point(position.X - arrowSize, position.Y),
                        new Point(position.X + arrowSize/2, position.Y - arrowSize/2),
                        new Point(position.X + arrowSize/2, position.Y + arrowSize/2)
                    };
                    break;
            }

            if (arrowPoints != null)
            {
                g.FillPolygon(Brushes.White, arrowPoints);
                g.DrawPolygon(Pens.Black, arrowPoints);
            }
        }

        private void DrawTemporaryConnection(Graphics g)
        {
            if (_connectionStartNode != null && _connectionEndPoint != Point.Empty)
            {
                g.DrawLine(_tempConnectionPen, _connectionStartNode.Position, _connectionEndPoint);
            }
        }

        private void DrawUIInfo(Graphics g)
        {
            // 회사 로고
            if (_companyLogo != null)
            {
                var logoRect = new Rectangle(10, 10, 100, 50);
                g.DrawImage(_companyLogo, logoRect);
            }

            // 측정 정보
            if (!string.IsNullOrEmpty(_measurementInfo))
            {
                var font = new Font("Arial", 9);
                var textBrush = new SolidBrush(Color.Black);
                var backgroundBrush = new SolidBrush(Color.FromArgb(200, Color.White));
                
                var textSize = g.MeasureString(_measurementInfo, font);
                var textRect = new Rectangle(
                    Width - (int)textSize.Width - 20,
                    Height - (int)textSize.Height - 20,
                    (int)textSize.Width + 10,
                    (int)textSize.Height + 10
                );

                g.FillRectangle(backgroundBrush, textRect);
                g.DrawRectangle(Pens.Gray, textRect);
                g.DrawString(_measurementInfo, font, textBrush, textRect.X + 5, textRect.Y + 5);

                font.Dispose();
                textBrush.Dispose();
                backgroundBrush.Dispose();
            }

            // 줌 정보
            var zoomText = $"Zoom: {_zoomFactor:P0}";
            var zoomFont = new Font("Arial", 10, FontStyle.Bold);
            var zoomSize = g.MeasureString(zoomText, zoomFont);
            var zoomPoint = new Point(10, Height - (int)zoomSize.Height - 10);
            
            g.FillRectangle(new SolidBrush(Color.FromArgb(200, Color.White)),
                zoomPoint.X - 5, zoomPoint.Y - 5,
                zoomSize.Width + 10, zoomSize.Height + 10);
            g.DrawString(zoomText, zoomFont, Brushes.Black, zoomPoint);
            zoomFont.Dispose();
        }

        private Rectangle GetVisibleBounds()
        {
            var left = (int)(-_panOffset.X / _zoomFactor);
            var top = (int)(-_panOffset.Y / _zoomFactor);
            var right = (int)((Width - _panOffset.X) / _zoomFactor);
            var bottom = (int)((Height - _panOffset.Y) / _zoomFactor);

            return new Rectangle(left, top, right - left, bottom - top);
        }

        #endregion
    }
}