GMap study notes.

GMap study notes.

GMap Study Notes

1. GMap system details

• What isMap control(GMapControl)? This is the control which renders the map.
• What isOverlay(GMapOverlay)? This is a layer on top of the map control. You can have several layers on top of a map, each layer representing, say, a route with stops, a list of stores etc.
• What areMarkers(GMapMarker)? These are the points on a layer, each representing a specific geo location (Lat, Lon) e.g. each drop point on a route.
• What isRoute(GMapRoute)? This is the path or direction between two or more poin

 

 

 

 

 

 

 

 

 

 

 

2. c # Use GMap to implement specific functions (MAP loading, zoom-in, zoom-out, eagleeye, DOT/line surface adding, custom marker, and download cache)

Note: addGMap. NET. Core. dllAndGMap. NET. WindowsForms. dll file,Use the GMap control after the reference.

2.1 load map

SuperMap iServer REST service is called directly here. Call third-party map service reference http://www.cnblogs.com/luxiaoxun/p/3364107.html

2.2 zoom in and out a map

Private void tsbZoomIn_Click (object sender, EventArgs e) {this. mapControl1.Zoom + = 1;} private void tsbZoomOut_Click (object sender, EventArgs e) {this. mapControl1.Zoom-= 1;} // The Event private void mapcontrolpoliconmapzoomchanged () {double zoom = this. mapControl1.Zoom-Convert. toDouble (5); this. mapControl2.Zoom = zoom; // set the map zoom size}

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2.3 eagleeye

Two map controls are required to scale and move at the same time to achieve linkage effect.

GMapControl1 event setting code:

Private bool Mapleft1 = false; private void gmapcontrol+mousedown (object sender, MouseEventArgs e) {if (e. button = MouseButtons. left) {Mapleft1 = true;} private void gmapcontrol+mouseup (object sender, MouseEventArgs e) {if (e. button = MouseButtons. left) {Mapleft1 = false;} private void gmapcontrolpoliconpositionchanged (PointLatLng point) {if (Mapleft1) {this. gMapControl2.Position = point; // set the map center point} private void gmapcontrolpoliconmapzoomchanged () {double zoom = this. gMapControl1.Zoom-Convert. toDouble (5); this. gMapControl2.Zoom = zoom; // set the map zoom size}

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GMapControl2 event setting code:

Private bool Mapleft2 = false; private void gMapControl2_MouseMove (object sender, MouseEventArgs e) {lastPosition1 = this. gMapControl1.FromLocalToLatLng (e. x, e. y);} private void gMapControl2_MouseUp (object sender, MouseEventArgs e) {if (e. button = MouseButtons. left) {Mapleft2 = false;} private void gMapControl2_MouseDown (object sender, MouseEventArgs e) {if (e. button = MouseButtons. left) {this. gMapControl1.Position = lastPosition1; // click Set gMapControl1. center point Mapleft2 = true;} private void gMapControl2_OnPositionChanged (PointLatLng point) {if (Mapleft2) {this. gMapControl1.Position = point; // set gMapControl1 center point }}

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2.4 Add a DOT/line Surface

Take adding a vertex object as an example:

IAction _ editAddAlarmAction = null; // Add the alarm source private void handle (object sender, EventArgs e) {if (_ editAddAlarmAction = null) {_ editAddAlarmAction = new AddAlarmAction ();} this. mapControl1.CurrentAction = _ editAddAlarmAction; ToolCheckChanged (sender as ToolStripItem ). name );}

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Public class AddAlarmAction: Action {List <Feature> targetFeatures = null; private GMapControl _ gMapControl = null; private GMapOverlay markerOverlay = new GMapOverlay ("addalarm"); private bool _ start = false; list <PointLatLng> _ points = null; List <Point2D> _ point2Ds = new List <Point2D> (); private string _ mapUrl = string. empty; private string _ mapName = string. empty; Map _ map = null; public overri De void OnLoad (GMapControl gMapControl) {_ gMapControl = gMapControl; _ gMapControl. overlays. add (markerOverlay); _ points = new List <PointLatLng> (); _ start = false; this. _ mapUrl = (SuperMapProvider) gMapControl. mapProvider ). serviceUrl; this. _ mapName = (SuperMapProvider) gMapControl. mapProvider ). mapName; this. _ map = new Map (this. _ mapUrl);} public override void OnMapMouseDown (object sender, MouseEven TArgs e) {PointLatLng currentPoint = this. _ gMapControl. fromLocalToLatLng (e. x, e. y); double mercatorX, mercatorY; Helper. lonLat2Mercator (currentPoint. lng, currentPoint. lat, out mercatorX, out mercatorY); Point2D point2D = new Point2D (mercatorX, mercatorY); _ point2Ds. add (point2D); _ points. add (currentPoint); if (_ start) {GMapMarker marker = new GMapMarkerImage (currentPoint, new Bitmap ("C: \ Users \ y Aohui \ Desktop \ iClient-for-DotNet-master \ Demo \ demo. winform \ Resources \ sign-warning-icon.png "); markerOverlay. markers. add (marker); marker. toolTipText = "alarm source number:"; marker. toolTip. fill = Brushes. blue; marker. toolTip. foreground = Brushes. white; marker. toolTip. stroke = Pens. black; marker. toolTip. textPadding = new Size (20, 20); marker. toolTipMode = MarkerTooltipMode. onMous EOver;} _ start = true;} public override void OnMapMouseDoubleClick (object sender, MouseEventArgs e) {if (! _ Start) return; PointLatLng currentPoint = this. _ gMapControl. fromLocalToLatLng (e. x, e. y); double mercatorX, mercatorY; Helper. lonLat2Mercator (currentPoint. lng, currentPoint. lat, out mercatorX, out mercatorY); Point2D point2D = new Point2D (mercatorX, mercatorY); markerOverlay. markers. clear (); _ points. clear (); _ point2Ds. clear (); _ start = false ;}}

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2.5 custom marker

Extended by inheriting the marker class of gmap: (The highlighted paint brush is added here)

using GMap.NET.WindowsForms;using System;using System.Collections.Generic;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace gmap.demo.winform{    class GMapMarkerImage : GMapMarker    {        private Image image;        public Image Image        {            get            {                return image;            }            set            {                image = value;                if (image != null)                {                    this.Size = new Size(image.Width, image.Height);                }            }        }        public bool IsHighlight = true;        public Pen HighlightPen        {            set;            get;        }        public Pen FlashPen        {            set;            get;        }        public Pen OutPen        {            get;            set;        }        private Timer flashTimer = new Timer();        private int radius;        private int flashRadius;        public GMapMarkerImage(GMap.NET.PointLatLng p, Image image)            : base(p)        {            Size = new System.Drawing.Size(image.Width, image.Height);            Offset = new System.Drawing.Point(-Size.Width / 2, -Size.Height / 2);            Image = image;            HighlightPen = new System.Drawing.Pen(Brushes.Red, 2);            radius = Size.Width >= Size.Height ? Size.Width : Size.Height;            flashTimer.Interval = 10;            flashTimer.Tick += new EventHandler(flashTimer_Tick);        }        void flashTimer_Tick(object sender, EventArgs e)        {            if (FlashPen == null)            {                FlashPen = new Pen(Brushes.Red, 3);                flashRadius = radius;            }            else            {                flashRadius += radius / 4;                if (flashRadius >= 2 * radius)                {                    flashRadius = radius;                    FlashPen.Color = Color.FromArgb(255, Color.Red);                }                else                {                    Random rand = new Random();                    int alpha = rand.Next(255);                    FlashPen.Color = Color.FromArgb(alpha, Color.Red);                }            }        }        //this.Overlay.Control.Refresh();        //this.mapControl1.Refresh();        public void StartFlash()        {            flashTimer.Start();        }        public void StopFlash()        {            flashTimer.Stop();            if (FlashPen != null)            {                FlashPen.Dispose();                FlashPen = null;            }        }        //this.mapControl1.Refresh();        public override void OnRender(Graphics g)        {            if (image == null)                return;            Rectangle rect = new Rectangle(LocalPosition.X, LocalPosition.Y, Size.Width, Size.Height);            g.DrawImage(image, rect);            if (IsMouseOver && IsHighlight)            {                g.DrawRectangle(HighlightPen, rect);            }            if (FlashPen != null)            {                g.DrawEllipse(FlashPen,                    new Rectangle(LocalPosition.X - flashRadius / 2 + Size.Width / 2, LocalPosition.Y - flashRadius / 2 + Size.Height / 2, flashRadius, flashRadius));            }        }        //public override void Dispose()        //{        //    if (HighlightPen != null)        //    {        //        HighlightPen.Dispose();        //        HighlightPen = null;        //    }        //    if (FlashPen != null)        //    {        //        FlashPen.Dispose();        //        FlashPen = null;        //    }        //}    }}

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2.6

// Save the map as an image private void toolStripButton6_Click (object sender, EventArgs e) {try {using (SaveFileDialog dialog = new SaveFileDialog () {dialog. filter = "PNG (*. png) | *. png "; dialog. fileName = "GMap. NET image "; Image image = this. mapControl1.ToImage (); if (image! = Null) {using (image) {if (dialog. ShowDialog () = DialogResult. OK) {string fileName = dialog. FileName; if (! FileName. endsWith (". png ", StringComparison. ordinalIgnoreCase) {fileName + = ". png ";} image. save (fileName); MessageBox. show ("image saved:" + dialog. fileName, "GMap. NET ", MessageBoxButtons. OK, MessageBoxIcon. asterisk) ;}}}} catch (Exception exception) {MessageBox. show ("image saving failed:" + exception. message, "GMap. NET ", MessageBoxButtons. OK, MessageBoxIcon. hand );}}

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2.7 save Cache

// Save the cache private void toolStripButton7_Click (object sender, EventArgs e) {if (this. mapControl1.ShowExportDialog () = true) {// this. gMapControl1.ShowTileGridLines = true; // display the tile, that is, display the square this. mapControl1.ReloadMap ();}}

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3. iclient for. net simulates B/S to display the alarm blinking demo

 

4. Reference

Http://www.cnblogs.com/luxiaoxun/p/3494756.html

Http://blog.csdn.net/sunsun1203/article/details/53816464

Http://www.cnblogs.com/luxiaoxun/p/3475355.html

Http://blog.sina.com.cn/s/blog_819100560101dgng.html