SharpMap - Geospatial Application Framework for the CLR

New Post: How to set label at the mid of a line

johndiss — Fri, 03 Jul 2009 09:32:51 GMT

Remember that Graphics.MeasureString returns a result in the screen / image pixels whereas the geometries are in real world coordinates. You will need to use Map.ImageToWorld and Map.WorldToImage to convert between the two reference systems.. hth jd

New Post: How to set label at the mid of a line

nguyen1phuong — Fri, 03 Jul 2009 07:03:06 GMT

Hi johndiss,

Thanks for your reply, I tried MeasureString but they don't work. Here is my code

SharpMap.Data.FeatureDataRow row = this.tbl.NewRow();
row["ID"] = toNode.ID.ToString();
strName = fromNode.ID.ToString() + "->" + toNode.ID.ToString();
row["Name"] = strName;
System.Drawing.SizeF textsize = g.MeasureString(strName, font);

row.Geometry = new SharpMap.Geometries.Point((fromNode.Position.X + toNode.Position.X) / 2 - textsize.Width / 2, (fromNode.Position.Y + toNode.Position.Y) / 2 - textsize.Height / 2) ;
tbl.AddRow(row);
.....

this.layerLabel.Style = new SharpMap.Styles.LabelStyle();
this.layerLabel.Style.HorizontalAlignment = SharpMap.Styles.LabelStyle.HorizontalAlignmentEnum.Center;
this.layerLabel.Style.VerticalAlignment = SharpMap.Styles.LabelStyle.VerticalAlignmentEnum.Top;
this.dataProviderTopo = new SharpMap.Data.Providers.GeometryFeatureProvider(this.tbl);
this.layerLabel.DataSource = this.dataProviderTopo;

mapControl1.Map.Layers.Add(layerLabel);

The problem is MeasureString function. The textsize.Width and textsize.Height are so big. For example, fromNode.Position.X =5 toNode.Position.X=10 and textsize.Width=70 ? Maybe i need a scale for MeasureString function?

New Post: Error in Sharpmapcf v2

ladome1 — Thu, 02 Jul 2009 19:53:12 GMT

hi,

i have to create shapefiles (point) by clicking points in my map using pocketpc. I've downloaded PocketTopologySuite but seems that function is not well implemented. So i checkout sharpmacf v2 from assembla because i think that i can manipulate shapefile with it. I try to compile it with the same error in many lines all in LayerPresenter.cs

Error Expected class, delegate, enum, interface, or struct

can somebody help me??Thanks

New Post: JPEG Layer + SharpMAP v0.9

johndiss — Thu, 02 Jul 2009 16:21:18 GMT

To be honest I dont know... as there are multiple projects in the solution - not sure if that is a limitation of the express versions currently..

New Post: JPEG Layer + SharpMAP v0.9

JDNelson — Thu, 02 Jul 2009 16:12:27 GMT

OK I think I get where you are coming from. Will this be buildable in VS2008 C# express?

Cheers

James

New Post: JPEG Layer + SharpMAP v0.9

johndiss — Thu, 02 Jul 2009 16:08:51 GMT

ExternalReferences/References4SharpMap.Extensions is in the trunk of the SharpMap source (http://sharpmap.codeplex.com/SourceControl/ListDownloadableCommits.aspx)- download with tortoise and build and use that instead of the dlls from the releases tab..

New Post: JPEG Layer + SharpMAP v0.9

JDNelson — Thu, 02 Jul 2009 15:46:15 GMT

I did that and got this error

Error 1 Type 'SharpMap.Layers.GdalRasterLayer' is not defined. C:\LCC\RankMAP\RankMAP\TAXI\TAXI\Form1.vb

Where would I find "ExternalReferences/References4SharpMap.Extensions "?

Cheers

James

New Post: JPEG Layer + SharpMAP v0.9

johndiss — Thu, 02 Jul 2009 15:36:40 GMT

Hi James, they should be in the ExternalReferences/References4SharpMap.Extensions dir - anything that starts gdal|ogr|osr

alternatively you may get them from http://fwtools.maptools.org/ but you may have issues with versioning

http://sharpmap.codeplex.com/Thread/View.aspx?ThreadId=46843 may be useful

hth jd

New Post: JPEG Layer + SharpMAP v0.9

JDNelson — Thu, 02 Jul 2009 15:27:00 GMT

Hi John

THanks for the very quick reply. Where do I get the FWTools DLLs from? Will I need to reference them from my VB.NET project?

Cheers

James

New Post: JPEG Layer + SharpMAP v0.9

johndiss — Thu, 02 Jul 2009 15:24:21 GMT

Hi JDNelson, usually when people have issues with the GDALRasterLayer it is due to not copying _all_ the unmanaged FWTools dlls to the bin folder hth jd

New Post: JPEG Layer + SharpMAP v0.9

JDNelson — Thu, 02 Jul 2009 15:19:32 GMT

I am creating a WinForms app. I can create vector layers (using ESRI Shape files) no problems. Point and label layers from Access.MDB files. I now have a JPG file fully georeff'd with a jpw file. But No joy! How do I implement a GDALRaterLayer? I am using VB.NET in VS2008 Express. The code is this...

'================

Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim myMAP As New SharpMap.Map(New Size(MapImage1.Width, MapImage1.Height))
        Dim OSJPGLayer As SharpMap.Layers.GdalRasterLayer = New SharpMap.Layers.GdalRasterLayer("OS", "OS10K.jpg")
        myMAP.Layers.Add(OSJPGLayer)
        myMAP.BackColor = Color.White
        myMAP.ZoomToExtents()
        MapImage1.Image = myMAP.GetMap()
    End Sub
End Class

'================

it is the OSJPGLayer that screw things up. I have sharpMap.dll and sharpMap.UI.dll referenced... again I am using v0.9.

Any tips or help gratefully received.

Cheers

James

New Post: How to set label at the mid of a line

johndiss — Thu, 02 Jul 2009 09:57:01 GMT

Hi nguyen1phuong, have you seen the LabelLayer.MultiPartGeometryBehavior, LabelStyle.[Horizontal|Vertical]Alignment ? If they don't work and you still need to measure the string you will need to use Graphics.MeasureString though this may require a bit of customisation to get a handle on the graphics object being used also note that MeasureString is a pretty slow call.

hth jd

New Post: drag and select with a mouse on the map

Ray_Z — Thu, 02 Jul 2009 08:32:51 GMT

Hi jd ,thx for ur advices, i wil try it and see if it can work.

thx again.

New Post: How to set label at the mid of a line

nguyen1phuong — Thu, 02 Jul 2009 02:33:51 GMT

Hi everybody,

I want to put a label at the mid of a line as folowing:

(x1,y1) ---(my label)--- (x2,y2)

I set Geometry of label is (x1+x2)/2, (y1+y2)/2. But it still displays wrong position.

Maybe geometry of label must be (x1+x2)/2 - length(my label)/2. But I don't know how to get length of label.

Anyone help me

Thanks for any reply !

New Post: new to sharp map

Ray_Z — Thu, 02 Jul 2009 01:48:20 GMT

Hi Fawad, do you mean that u want to keep a record of the place u have clicked ? im looking at a problem like that , it requires that the path of their clicks are recorded so that they could review have u got an idea on your probs? maybe we can discuss it together

New Post: create/update shapefile sharpmapcf

johndiss — Wed, 01 Jul 2009 21:28:59 GMT

Assuming PocketTopologySuite doesn't deviate too far from NTS the test in NetTopologySuite.Samples.Console.Tests.IO.ShapefileWriteTest may help you get started hth jd

New Post: create/update shapefile sharpmapcf

ladome1 — Wed, 01 Jul 2009 17:02:44 GMT

i have downloaded and successfully compiled the pocketTopologySuite, and there are classes for edit shapefile, but i don't find any code example to do this. These classes are shapefilewrites and Shapewriter...can you post some example?thanks

New Post: create/update shapefile sharpmapcf

johndiss — Wed, 01 Jul 2009 14:08:59 GMT

Hi ladome1, I dont know what state SharpMap cf 2 is in - last I heard of it was quite a long time ago.. I meant NTS v1.7.x http://nettopologysuite.googlecode.com hth jd

New Post: create/update shapefile sharpmapcf

ladome1 — Wed, 01 Jul 2009 13:24:34 GMT

thank you for the answer...i can use NTS with sharpmapcf 0.9? I try to compile sharpmapcf 2.0 from assembla svn, but i got 6 error in presenterslayers like this:

Error Expected class, delegate, enum, interface, or struct

thanks

New Post: drag and select with a mouse on the map

johndiss — Wed, 01 Jul 2009 09:28:58 GMT

Hi Ray_Z check out the Tools.Query options in MapImage and MapBox they will allow you to determin the geometries which intersect a dragged area. You can then either add the resulting geometries as a new temporary layer or you could use a Theme to render the matching geometries in the original layer differently. hth jd