BMap.NET.WindowsForm/MapDownloaderControl.cs

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using BMap.NET.WindowsForm.BMapElements;
using BMap.NET.WindowsForm.DrawingObjects;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace BMap.NET.WindowsForm
{
    /// <summary>
    /// 百度地图显示控件
    /// </summary>
    public partial class MapDownloaderControl : UserControl
    {
        private const double DISTANCE = 111319.49; //每（经纬）度距离m

        #region 属性

        private LatLngPoint _center = new LatLngPoint(117.217412, 39.142191);   //天津

        /// <summary>
        /// 地图显示中心经纬度坐标
        /// </summary>
        [Description("地图中心点"), Category("BMap.NET")]
        public LatLngPoint Center
        {
            get
            {
                return _center;
            }
            set
            {
                _center = value;
            }
        }

        private int _zoom = 12;

        /// <summary>
        /// 地图缩放级别(3-18)
        /// </summary>
        [Description("当前地图缩放级别"), Category("BMap.NET")]
        public int Zoom
        {
            get
            {
                return _zoom;
            }
            set
            {
                _zoom = value;
                _tiles.Clear();
                Invalidate();
            }
        }

        private MapMode _mode = MapMode.Normal;