using System;
using System.Collections.ObjectModel;
using System.Drawing;
using System.Windows.Forms;
using ThinkGeo.MapSuite.Core;
namespace NegativeBuffering
{
public partial class TestForm : Form
{
private MapEngine mapEngine = new MapEngine();
private Bitmap bitmap = null;
public TestForm()
{
InitializeComponent();
}
private void TestForm_Load(object sender, EventArgs e)
{
// Set the extent and the background color
mapEngine.CurrentExtent = ExtentHelper.GetDrawingExtent(new RectangleShape(-97.7533,30.3191,-97.7261,30.3032), Map.Width, Map.Height);
mapEngine.BackgroundFillBrush = new GeoSolidBrush(GeoColor.GeographicColors.ShallowOcean);
//Displays the World Map Kit as a background.
ThinkGeo.MapSuite.Core.WorldMapKitLayer worldMapKitLayer = new ThinkGeo.MapSuite.Core.WorldMapKitLayer();
mapEngine.StaticLayers.Add(worldMapKitLayer);
//PolygonShape to buffer.
PolygonShape polygonShape = new PolygonShape();
polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7325,30.3164));
polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7359,30.3151));
polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7428,30.3053));
polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7382,30.303));
polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7374,30.3088));
polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7329,30.3115));
polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7325, 30.3164));
InMemoryFeatureLayer inMemoryFeatureLayer = new InMemoryFeatureLayer();
inMemoryFeatureLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.CreateSimpleAreaStyle(GeoColor.FromArgb(80, GeoColor.StandardColors.Red), GeoColor.StandardColors.Black);
inMemoryFeatureLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
inMemoryFeatureLayer.InternalFeatures.Add("Area", new Feature(polygonShape));
InMemoryFeatureLayer BufferInMemoryFeatureLayer = new InMemoryFeatureLayer();
BufferInMemoryFeatureLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.CreateSimpleAreaStyle(GeoColor.FromArgb(150, GeoColor.StandardColors.Yellow), GeoColor.StandardColors.Black);
BufferInMemoryFeatureLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
//Calls the BufferPolygon function to get the buffered polygon with a negative distance.
MultipolygonShape bufferMultiPolygonShape = NegativeBufferPolygon(polygonShape, GeographyUnit.DecimalDegree, 50, DistanceUnit.Meter);
BufferInMemoryFeatureLayer.InternalFeatures.Add("BufferArea", new Feature(bufferMultiPolygonShape));
mapEngine.DynamicLayers.Add("AreaLayer", inMemoryFeatureLayer);
mapEngine.DynamicLayers.Add("BufferAreaLayer", BufferInMemoryFeatureLayer);
DrawImage();
}
//Negative Buffer is done in three steps.
private MultipolygonShape NegativeBufferPolygon(PolygonShape polygonShape,GeographyUnit polygonShapeUnit, double distance, DistanceUnit distanceUnit)
{
// 1) Gets the perimeter of the polygon as a LineShape.
LineShape perimeterLineShape = GetPerimeter(polygonShape);
// 2) Buffers the perimeter by the set distance.
MultipolygonShape bufferPerimeterMultiPolygonShape = perimeterLineShape.Buffer(distance, polygonShapeUnit, distanceUnit);
// 3) Performs the geometric operation of getting the Difference of the buffered perimeter and the polygon
//to get the final buffer result.
MultipolygonShape bufferMultiPolygonShape = polygonShape.GetDifference(bufferPerimeterMultiPolygonShape);
return bufferMultiPolygonShape;
}
private LineShape GetPerimeter(PolygonShape polygonShape)
{
LineShape perimeterLineShape = new LineShape();
foreach (Vertex vertex in polygonShape.OuterRing.Vertices)
{
perimeterLineShape.Vertices.Add(new Vertex(vertex.X, vertex.Y));
}
return perimeterLineShape;
}
private void DrawImage()
{
if (bitmap != null) { bitmap.Dispose(); }
bitmap = new Bitmap(Map.Width, Map.Height);
mapEngine.OpenAllLayers();
mapEngine.DrawStaticLayers(bitmap, GeographyUnit.DecimalDegree);
mapEngine.DrawDynamicLayers(bitmap, GeographyUnit.DecimalDegree);
mapEngine.CloseAllLayers();
Map.Image = bitmap;
}
private void ToolBar_ButtonClick(object sender, ToolBarButtonClickEventArgs e)
{
switch (e.Button.Tag.ToString())
{
case "Zoom In":
mapEngine.CurrentExtent.ScaleDown(50);
break;
case "Zoom Out":
mapEngine.CurrentExtent.ScaleUp(50);
break;
case "Full Extent":
mapEngine.CurrentExtent = ExtentHelper.GetDrawingExtent(new RectangleShape(-180.0, 83.0, 180.0, -90.0), Map.Width, Map.Height);
break;
case "Pan Left":
mapEngine.CurrentExtent = ExtentHelper.Pan(mapEngine.CurrentExtent, PanDirection.Left, 20);
break;
case "Pan Right":
mapEngine.CurrentExtent = ExtentHelper.Pan(mapEngine.CurrentExtent, PanDirection.Right, 20);
break;
case "Pan Up":
mapEngine.CurrentExtent = ExtentHelper.Pan(mapEngine.CurrentExtent, PanDirection.Up, 20);
break;
case "Pan Down":
mapEngine.CurrentExtent = ExtentHelper.Pan(mapEngine.CurrentExtent, PanDirection.Down, 20);
break;
default:
break;
}
DrawImage();
}
private void btnClose_Click(object sender, EventArgs e)
{
this.Close();
}
private void Map_MouseMove(object sender, MouseEventArgs e)
{
//Displays the X and Y in screen coordinates.
statusStrip1.Items["toolStripStatusLabelScreen"].Text = "X:" + e.X + " Y:" + e.Y;
//Gets the PointShape in world coordinates from screen coordinates.
PointShape pointShape = ExtentHelper.ToWorldCoordinate(mapEngine.CurrentExtent, new ScreenPointF(e.X, e.Y), Map.Width, Map.Height);
//Displays world coordinates.
statusStrip1.Items["toolStripStatusLabelWorld"].Text = "(world) X:" + Math.Round(pointShape.X, 4) + " Y:" + Math.Round(pointShape.Y, 4);
}
}
}