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Yeah, it's aliasing. The "green" halo isn't green. At least, it's not the green of your transparency green.
In order to get rid of the green, you have to get rid of the antialiasing while drawing the clock image. On your Graphics object, set the SmoothingMode = None.
Your clock image will end up with "jaggies" all around it, but you won't get the halo any more.
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Thanks for your response, which makes sense. I have, however, now tried setting the SmoothingMode to None in the Panel's overridden OnPaint Event without changing the (mis)behavior. I assume that the aliasing is occurring earlier, probably when the image (a .png file included and passed as a Resource item) is read in and converted to its internal Bitmap format, and I don't see how I can influence that step.
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It could also be in the image itself if it was created with antialiasing turned on.
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Yes. Looking at the image at a very high zoom, I do now see that it is antialiased. However, the 'smoothing' is all grayscale, which would not be a problem if it carried over to the final displayed image. It is the green false color introduced by the Panel's rendering of it that is the major issue. I will see if I can 'un-antialias' the original image, but that may introduce different, but equally unsightly, problems.
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Since writing my last message, I 'un-antialiased' the source image and tried again. Even though there are only three colors of pixels in the new source image (pure black, pure white, and the very dark gray used for the area to be rendered as transparent), the panel appears exactly the same when displayed on the desktop - with the thin green 'halo' round the clock. The new source image can be found here. It really does look as if the false color aliasing is happening when the image is created/initialized.
modified 6-Aug-21 16:06pm.
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I did something similar, though not transparent, a couple decades ago.
Instead of using an image like that, I just drew the entire clock face when needed.
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Since the clock face is invariant, it seemed to me to make sense to use a static image. My other experiments, described in the other 'branch' of this thread, would also suggest that your approach would not solve the haloing problem with transparency.
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I think no matter what color you pick for the chroma key, you're going to have the same problem. It comes down to the key color you pick isn't the resulting key color when the black of the clock face and the key color are blended together. I don't think there's going to be any solution to the problem while using a chroma key.
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I am not sure what you mean by 'chroma key' in this context. The placeholder 'color' I am using for the transparent area is a very dark gray - the entire palette of the image is grayscale. If you blend black, white, and a pure grey in any proportions, you shouldn't get bright green!
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The "chroma key" is the color chosen to be replaced by "transparent", or "green screen".
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That's what I thought you meant, hence my comment that blending white, black, and gray shouldn't give you green!
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PixelFormat.Format32bppRgb
With black and white you can get by with 8 bits.
It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food
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Yes. I was reusing old code which allowed color images. I wasn't the original author, so I didn't change anything that I didn't think absolutely had to be changed, and I wasn't sure whether any of the other reused code implicitly assumed the specified format. Indeed, experimentation since you raised the issue showed that using other formats (including indexed and grayscale ones) does cause other problems.
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In general, Windows (10) recommends against bit maps because they don't scale well. Use (font) icons and vector graphics. Segoe UI MDL2 assets can be overlayed, reversed and rotated. The .NET shape classess provide circles, polygons, etc.
In your case, I would try overlaying the outter problem area with an ellipse / circle (black stroke, transparent fill) for a quick fix.
It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food
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Well, that was very interesting! Doing as you suggested does not solve the problem. If you use a sensible sized pen (fairly small), nothing visible happens, and the 'halo' looks just as before, though there is a suggestion of it disappearing at the points where the drawn circle overlaps the edges of the original image (the top, bottom, and two sides). If you use a thicker pen, it is more obvious that the 'halo' is gone at the overlapped edges, but it is just pushed out to the edge of the drawn circle over the rest of the rendered image - it still always appears where a 'transparent' pixel was adjacent to one of another color, whether that pixel was part of the original bitmap or subsequently drawn on the Graphic. Presumably, therefore, it is an artefact of the [Bitmap].MakeTransparent() Function, but I have no idea why it has not (as far as I can tell) been described before
Parenthetically, I now see that that function forces the Bitmap on which it is invoked to 32bppRgb mode, since that format has the alpha channel which it needs, so any attempt to use a different format would be pointless.
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I think your problem is part of Windows Forms.
I do a lot of graphics in UWP and WPF and never have any issues I can't overcome.
e.g. WPF and snap to pixels:
Quote: You can set this property to true on your root element to enable pixel snap rendering throughout the UI. For devices operating at greater than 96 dots per inch (dpi), pixel snap rendering can minimize anti-aliasing visual artifacts in the vicinity of single-unit solid lines.
It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food
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I want to pass PointF as optional Parameter. But I am finding it difficult to assign default value for PointF.
I can't assign Nothing. If I do it becomes (0,0) which can be working value hence can't be used as a unique default value.
I am not able to assign any other value. I tried (Optional P1 As PointF = New PointF(-100, -100) but it does not work.
Public MyFunc(Optional P1 As PointF = ????)
Please help.
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Use a nullable value type:
Nullable Value Types - Visual Basic | Microsoft Docs[^]
Public Function MyFunc(Optional P1 As PointF? = Nothing) Or:
Public Function MyFunc(Optional P1 As Nullable(Of PointF) = Nothing)
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Hello everybody,
Maybe this is not the correct place, but the programs (web service) it is in vb scripts.
First i don not nothing about VBS, but we have an old WS in VB.
This is how its works:
http://..../ws?cmd=country
Then the scripts read the action, and call a method (just a query and return a JSON).
The problem: if we need to pass an specific country: How do we do it in the http and how to read the parameter in the code, because the script only recives: country, cities, etc and return the whole data.
Thanks
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There is no way anyone can answer your question based on the information provided. We have no idea what your code is doing, so how are we supposed to know what parameters it accepts, or how you can pass them?
Talk to the person who wrote the service, or consult the documentation.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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That is correct, here is part of the code:
<%@ Language = "VBScript" %>
<% Option Explicit %>
<%
sAction = Request.QueryString("cmd") 'This received the action: 'http://.../ws/get.asp?cmd=Sucursales': Sucursale, and with a Select Case execute the method
If sAction & "x" = "x" Then sAction = getFormField("cmd", 1)
If sAction & "x" <> "x" Then
...
Select Case UCase(sAction)
Case "SUCURSALES"
Call getSucursalesJSON()
Case "AGENCIAS"
...
Sub getSucursalesJSON()
Dim sSqlWrk, rswrk
sSqlWrk = "SELECT LTRIM(RTRIM(a.[AGE_CODIGO])) AS 'AGE_CODIGO', UPPER(LTRIM(RTRIM(a.[AGE_DESCRIPCION]))) AS 'AGE_DESCRIPCION'"
sSqlWrk = sSqlWrk & " FROM [" & xDb_CatalogOpe_Str & "].[dbo].[SUCURSALES_X_AGENCIAS] AS x WITH (NOLOCK)"
sSqlWrk = sSqlWrk & " INNER JOIN [" & xDb_CatalogOpe_Str & "].[dbo].[SUCURSALES] AS s WITH (NOLOCK)"
sSqlWrk = sSqlWrk & " ON x.[SUC_CODIGO] = s.[SUC_CODIGO]"
sSqlWrk = sSqlWrk & " AND x.[COM_CODIGO] = s.[COM_CODIGO]"
sSqlWrk = sSqlWrk & " INNER JOIN [" & xDb_CatalogOpe_Str & "].[dbo].[AGENCIAS] AS a WITH (NOLOCK)"
sSqlWrk = sSqlWrk & " ON x.[AGE_CODIGO] = a.[AGE_CODIGO]"
sSqlWrk = sSqlWrk & " WHERE (x.[COM_CODIGO] = 1)"
sSqlWrk = sSqlWrk & " AND (x.[SXA_ESTADO] = 'A')"
sSqlWrk = sSqlWrk & " AND (x.[SXA_TIPO] = 'S')"
sSqlWrk = sSqlWrk & " AND (x.[SXA_REGISTRO_WEB] = 'S')"
sSqlWrk = sSqlWrk & " AND (s.[SUC_ESTADO] = 'A')"
sSqlWrk = sSqlWrk & " AND (a.[AGE_ESTADO] = 'A')"
sSqlWrk = sSqlWrk & " ORDER BY x.[SXA_ORDENAR_WEB], a.[AGE_DESCRIPCION]"
Set rswrk = conn.Execute(sSqlWrk)
oJSON.LoadRecordset rswrk
Set rswrk = Nothing
oJSON.Write()
End Sub
If we need to call the WS:
'http://.../ws/get.asp?cmd=Sucursales' This return the whole table,
This is a very old code, but now we can not change it, so we need to pass:
'https://www.eps-int.com/ws/get.asp?cmd=agencias' + plus an specifc agencias
PS: Nobody knows who made this code. It was more than 8 years ago
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You can read query-string parameters by accessing the Request.QueryString collection - eg:
Dim sAgencia
sAgencia = Request.QueryString("agencia") You can test whether a value was passed by calling Len:
If Len(sAgencia) <> 0 Then
...
End If If a value is passed, you would need to add an additional filter to your query. However, you need to pass the value as a parameter to avoid a SQL Injection[^] vulnerability. This will complicate your code slightly - for example:
Sub getSucursalesJSON()
Dim sSqlWrk, rswrk, cmd
Dim sAgencia, pAgencia
Set cmd = Server.CreateObject("ADODB.Command")
Set cmd.ActiveConnection = conn
cmd.CommandType = adCmdText
sSqlWrk = "SELECT ..."
sSqlWrk = sSqlWrk & " FROM ..."
sSqlWrk = sSqlWrk & " WHERE ..."
sSqlWrk = sSqlWrk & " And ..."
sAgencia = Request.QueryString("agencia")
If Len(sAgencia) <> 0 Then
Set pAgencia = cmd.CreateParameter("agencia", adVarChar, adParamInput, 100, sAgencia)
cmd.Parameters.Append pAgencia
sSqlWrk = sSqlWrk & " And (x.agencia = ?)"
End If
sSqlWrk = sSqlWrk & " ORDER BY ..."
cmd.CommandText = sSqlWrk
Set rswrk = cmd.Execute()
oJSON.LoadRecordset rswrk
Set rswrk = Nothing
Set pAgencia = Nothing
Set cmd = Nothing
oJSON.Write()
End Sub To reference the ADODB constants, you will need to make sure the file includes the adovbs.inc directive towards the top:
<!--
VBScript ADO Programming - ActiveX Data Objects (ADO) | Microsoft Docs[^]
Everything you wanted to know about SQL injection (but were afraid to ask) | Troy Hunt[^]
How can I explain SQL injection without technical jargon? | Information Security Stack Exchange[^]
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Thanks a lot,
That is.
Thanks a lot again
So, to call the method from the http the parameters are pass using the normal rules to pass it?
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Yes, you'd just pass them in the query string, remembering to URL-encode them if necessary.
http: Percent-encoding - Wikipedia[^]
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Sorry: I can not make it works
Here a few word and how it works
First, we call the WS:http://..../wstest/get.asp?cmd=Agencias
In the code:
'Read the Request.QueryString("cmd")
sAction = Request.QueryString("cmd")
'Checked the action, action do not recives any param at all
'Then calls, depends of the action, a function
Select Case UCase(sAction)
Case "SUCURSALES"
Call getAgenciasJSON()
Case "CEDULA"
Call getCedulaJSON()
Case "RNC"
Call getRNCJSON()
Case Else
sErrorKey = "invalid_key_value"
sErrorMessage = getDictItem("Common.InvalidKeyValue")
Call SetUpJSONfail()
End Select
'This a function. All functions are like this
Sub getAgenciasJSON()
Dim sSqlWrk, rswrk
sSqlWrk = "SELECT * FROM [" & xDb_Catalog_Str & "].[dbo].[SUC_MAESTRA] as x with (nolock)"
sSqlWrk = sSqlWrk & " WHERE (x.[SUC_ESTADO] = 'A')"
sSqlWrk = sSqlWrk & " ORDER BY x.[SUC_DESCRIPCION]"
Set rswrk = conn.Execute(sSqlWrk)
oJSON.LoadRecordset rswrk
Set rswrk = Nothing
oJSON.Write()
End Sub
'This is the new function, which of course needs a param,
'The question is: How can i read o pass the param using: http://..../wstest/get.asp?cmd=cedula=784512422
' because cedula need a param. How can i read the param using sAction = Request.QueryString("cmd")?
'
Sub getCedulaJSON()'
Dim sSqlWrk, rswrk, sCedula
'How can i get the param cedula and it value in order to make the select
sCedula = Request.QueryString("cedula")
sSqlWrk = "SELECT nombres, apellido1, apellido2 from cedulados where trim(mun_ced) + trim(seq_ced) + trim(ver_ced) = '" + sCedula + "'"
Set rswrk = conn2.Execute(sSqlWrk)
oJSON.LoadRecordset rswrk
Set rswrk = Nothing
oJSON.Write()
End Sub
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