C# - Graphics FillRectangle Except Specified Area (.NET, GDI+)?
Jun 18, 2012
I would like to use Graphics.FillRectangle or Graphics.Clear with semi-transparent colour (e.g. ARGB=128,0,0,0) to darken entire area of the Graphics object except some specified (rectangular) area:I know this can be achieved with four FillRectangle calls, but I wonder if it cannot be done easier.I am aware of simple clipping (Graphics.SetClip), but this allows me to clip everything outside the specified area and I would like to achieve the opposite.
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Jul 25, 2011
i'm working on Virtual K770i project - there is a picture of mobile, now i want to create clickable areas on "keypad" of mobile....I'm got idea about transparent label or something but transparency dont work on any object but Form1 - so how to make transparent clickable areas on picture box (see a picture)
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May 27, 2010
faster way to flood fill an area of a bitmap? It basically acts just like the fill flood bucket in MS Paint. clsBitmapImage is a Bitmap variable.
Code:
Code:
Public Sub FloodFill(ByVal AtPoint As Point, ByVal newColor As Color)
Dim oldColor As Color = clsBitmapImage.GetPixel(AtPoint.X, AtPoint.Y)
If oldColor.ToArgb <> newColor.ToArgb Then
[code].....
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Apr 8, 2009
If I have a control, in this case a button, can I restrict the area it considers valid for text?
In the attached image, the left and right arrows are custom drawn in the paint even, I also have a scroll timer that scrolls the text if the length exceeds the buttons width as measured by Graphics.MeasureString.
I want to restrict the text from red line to red line so when the text scrolls it does not interfere with the arrow indicators, can the text area be overridden to some custom region?
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Jan 26, 2011
I am using the following code to place a rectangle around a form / form control, however what I want to do is make my screen grey and only the form / form control area be displayed in colour.
Code:
I have googled for ages trying to find something on this, but with no luck.
To illistrate this better they are using the same functionality in snagit 10, please see below link to a page that has a video link showing this (23 sec into video)[url]
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Aug 20, 2011
I have to create an image that is to mimic a single clock rotating hand within a square area,and the user has to choose the width and speed of the rotation and the direction.i managed to create the square area with a hand inside,with this codes and variables,
(Dim Mygraphics As graphics = e.graphics
mygrqaphics.Draw Rectangle(pens.color x1,x2,y1,y2)
mygraphics draw line(pens.color,x1,x2,y1,y2),now i have to find codes and variables to rotate the hand or line within a square area.one point remaining constant the other moving.
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Aug 14, 2009
Any method to remove the Filled Rectangle I put on a form / control using FillRectangle method? Or do I have to over-paint it with the same colour as the form ?
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Jun 11, 2012
Trying to set the viewable area to a smaller screen area and have it cycle through as the person moves using collision detection to move the backgroudn image. Here is the start but its off to a bad start so far.
Public Class Form1
Dim Mapx As Integer = 600
Dim Mapy As Integer = 2000
[code]....
Basically the forum size is set to 600x2000 but the client should only allow you to view 600x600. I want it to add +1 once you "collide with a invisable box I'll add and this will redraw the screen.
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May 12, 2010
I designed a form and managed to fit graphics inside it. Picture box is 465 pixels high. Form1 is 500 pixels high. SnapShot of the screen verifies that the 500 pixel height is the overal height. It includes the upper Bar and lower frame. Is there an instruction to set the From's inner pixel size and not overal?
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Nov 19, 2009
I guess thats what I need to do, Im trying to allow the user to right click on the top of my form, and my custom Context Menu Strip is displayed, not windows context menu strip. I guess somehow i would need to get the size and draw a rectangle on the non client area and see if the user has right clicked in that rectangle? if so how would I get the area of the non client area?
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Sep 23, 2011
We have a GIS application that has some performance issues. It creates and sends an image to a web browser. We start with a Bing Maps imager, add complex polygons (complete with transparent fill), save the finished image as a PNG, and send it to the browser.
The idea has come up that we could possibly install a graphics card and use DirectX or OpenGL to improve performance. I believe this would be the case even though we ultimately generate an image instead of sending the data the the screen. I believe our processes could still make use of the API and the hardware acceleration it provides. Our process is not unlike what CGI film makers do to render individuals frames of a film, though we simply render a single image and send it, as opposed to the hundreds of thousands of images needed for a single CGI film.
So my question is: would a powerful graphics card and use of DirectDraw or OpenGL provide us a worthwhile performance boost? It can take us 20-30 seconds to render a more complex map. Which is a long time to wait on a web page...
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Nov 19, 2010
Im working on a project that needs to print a report of one client.Everything went smooth untill i came across my multiline input text data.When i display it in the PrintPagePreview the text go's outside my page. Even when im printing it only the halve of my text is displayed. I googled and looked everywhere but i can't get a clear fix for it.
[Code]...
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Jan 22, 2011
I used to program with Visual Basic 6, so I have alot of old programs that I'm updating, plus I'm learning the new VB2008 methods. I'm writing a program that replaces the old "BitBlit" function which is no longer supported by Visual Basic 2008. It involves three picture boxes, one holds the sprite bitmap, a second holds the mask (silhouette) of the sprite bitmap, and a third has a background image.
[Code]...
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Aug 14, 2009
drawing text on a window which is not the current form's window.I remember doing this in Win32 api with getwindowdc(handle) to obtain a DC for the Window, then textout() on the DC.
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Jan 12, 2011
Ok, I want to create a class that will handle a special rectangle graphic.In my form, I want to have two of these special rectangles. So, basically, I need two instances of that class in my form, right?I manage to initialize two, alright. But, how exactly am I supposed tomanage drawing/graphics etc in a class, and the results to be displayed in my form?
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Oct 29, 2008
Using graphics paths for designing...but am getting an error when trying to add a shape to : _shapelist.add(createshape())
It says : Value of type 'system.drawing.drawing2d.graphicspath' cannot be converted to '1-dimensional array of system.drawing.drawing2d.graphicspath'
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Sep 27, 2010
[code]...
ok, i know the code is a little rough, but it should be good to give you an idea of what im trying to do, if not i will still explain.simply draw 2 lines one from left to right, another from top to bottom, intersecting through the tip of the mouse.ok, theres no problem there the lines draw perfectally the way i want them.... BUT! now heres the issue im having.i cant get rid the previous lines.i did a bit of good old "Google'ing" and ran across a few links that all pointed me to the ReDrawWindow API, so i tried (as you can see in the above code) but i just cant seem to get it worked out.
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Jan 19, 2011
So I decided to make my famous tile selector project, but instead of drawing in a form's graphics, do it inside a tabpage.Well, I managed to get it working, but it seems to... flicker.Normally, setting the form's DoubleBuffered property to True would help a lot there, but apparently, the tabpage has no such property.
When I invalidate the tabpage, I draw two images and fill one rectangle.Following past advice, those two images were created before, just once, and are stored in a variable so I don't create them every time I invalidate the tabpage.
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Aug 1, 2010
Ok I have this: This makes a sub called 'graphicspaint' then writes "demo version" to a picturebox1
Code:
Imports System.Drawing
Imports System.Windows.Forms
[code]......
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Dec 5, 2011
i whant do my own shadow effect. i can do the shandow. but how can i plus 2 bitmap images(1 above the other)?
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Oct 20, 2011
My application is all centered around one form with lots of graphics drawings on it.All these drawings take place from within a paint event handler. However, the amount of code within that sub is becomming unwieldy.I have been trying to move sonme of it to another class and use the "dim temp as Graphics = e.graphics" construction to continue to draw graphics. However, I get all kind of argument exception runtime arreors when doing so (and I do not get these with the same graphics operations directly from the original paint event handler. I have also tried to pass on the original e argument, but with the same result.Is my conclusion that there is no solution to this so to continue with the unwieldy amount of code,correct, or am I mistaken somewhere. the "dim temp as graphics = e graphics" is recommended.
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Oct 28, 2011
I load my picturebox with a jpeg. If I put my DrawObjects() sub into picturebox paint event.When ever a picturebox.refresh or picturebox.visible = true (vb.net seems to draw my DrawObjects() first, then load the jpeg Image over my drawing - erasing drawing) Is there a way to get the picturebox to redraw the jpg image first then draw on it, in picturebox paint event?
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Aug 21, 2008
In a Previous Thread, I asked some questions about how to create graphics. Everything was OK, until I realized that the graphics are really slow. While I was trying to find out what the problem was, I realized that the processor load was about 50% and my graphics card was not used at all. So doesn't Visual Basic use the Graphics Accelerator to process graphics? What I made is not a real program. It's like an experiment (I tried to make an image flip). Here is the Code:
[Code]...
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Apr 7, 2011
I am trying to do a game application similar to chess, where i need to move the game peaces(graphics) over another graphics which is the game board. using the mouse. How can I do multiple layers of graphics and control their movement(without using direct x, i know nothing about it)? Note: I have visual basic 2010 express, windows xp home
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May 4, 2012
I am trying to work out whether when I create a variable of type Graphics and assign it (is assign the correct word?) to the Graphics part of a PaintEventArgs instance I also need to Dispose of it, since I *think*Dim g As Graphics = e.Graphics is areference that that part of PaintEventArgs not a new instance of a Grpahics object, but I'm not sure.
Class A
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
MyBase.OnPaint(e)
[code].....
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Mar 6, 2012
I'm looking for a way to scan a certain area of a PDF or Tif,
and extract the OCR regonizied text which will help me rename these documents I have.
What tools or libaries can I use in .NET to make a quick short program to rename
TIF or PDF files into their appropriate name coming from a portion of text that is on each file.
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Mar 26, 2010
oksice there is no way to grab an image using its source i was wondering if there is a way to taking a screen pic at a certain x,y coordinates in a webbrowser1 then displaying it in a picture box.
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Aug 11, 2011
When I add areas to mschart ,chart is printed in smaller size.
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Mar 1, 2011
In an article in techrepublic about 10 tips to go from a beginner to an intermediate developer
one of the auther's suggestion was "try to become an expert in at least one area of focus" and learn advance idea in depth about that area. With this in my mind I have programmed for about a year mainly for database application in .NET envirnoment (VB/C#), Currently I want to focus or be an expert in at least one area of .NET environmt. As a resutl I had skimmed some area in .NET such as WCF,WPF, ASP.Net MVC ...etc (just reading an overview of different books). My current job . also demand on database programming mainly for desktop application.
So can you suggest me a list of areas of focus in .Net where I can delve on it beside my current job.
I am not sure whether they can be an area of focus I had some ideas such as SOA with WCF
MVC web application Database design and modelling
Edit @sajoshi I have some strength on data modeling and objected oriented design and mainly I like to work in domain modeling and object persistance with ORM tools.I have little interest on UI design.
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Apr 30, 2011
I have the latest versions of VS 2010, .NET 4.0 and MVC 3 and I have a problem using areas in asp.net mvc 3 when using vb.net.
I do the following:
Create a new visual basic asp.net mvc 3 project. Select Razor as the "View Engin" and call the project "TestApp".
Create a new area called "Test", it will be in the folder: /Areas/Test.
Add a new empty controller called "PageController.vb" in /Areas/Test/Controllers/".
Add a new folder in /Areas/Test/Views/ called "Page".
[Code]...
These are identical with what you get if you repete steps 1-7 and use c# (only difference is that you will get c# code that is equal to above vb.net code).
I repete: If I do the steps 1-7 in C# it works, but it will not work in vb.net!
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