Create Persistent Graphics On Top Of An Image?
Mar 1, 2011
I am building a program which offers solutions to the travelling salesman problem (finding shortest tour between a set of cities while visiting each only once).
My program loads a bitmap image of a map into a picture box. From there, graphics which point out the cities as well as tour paths are drawn onto the map. My problem is that when the option to plot ALL cities is enacted, the user may choose to pinpoint a specific city with a separate control. When the user erases that pinpoint via an invalidation routine, though, it erases all graphics beneath it, which is undesirable. How can I make my tour graphics and city plots semi-permanent by drawing them directly on the image? I tried drawing them on a separate bitmap, but it 'covered up' the map image.
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Sep 30, 2009
Is there a way to create an image from a graphics object?
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May 25, 2009
I am creating an application where when I click on an image I need to mark the place using the x and y co-ordinates given by the click and then after marking I put a red dot/circle on that spot and then I need to save this image to a file including the dot/circle I marked. I have tried saving the image to the file but to no avail, I have been able to only save the PictureBox image and that doesn't include the graphics. It is only the base image. I have tried to save it as a bitmap but have not gotten anywhere with that either. It seems whenever I call the image.save it takes only the value of the underlying image and saves it.
Private Sub BtnCreate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnCreate.Click
pointmarked = False
[Code]......
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Feb 26, 2012
In VB.NET, I need to create an Image based on a Graphics object I have. However, there is no method such as Image.fromGraphics() etc. What should I do then?
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Nov 19, 2011
I want to create a table as displayed in the image in VB.net. How do i do it ?? I tried LISTVIEW with Gridlines, but it has both horizontal and vertical lines, but in the image there is only Vertical lines.
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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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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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Nov 13, 2011
I'm a VB beginner.I've been playing with Graphics.DrawString by watermarking a picture with a text string. The picture below to the left comes from PictureBox with a text string drawn with Graphics.DrawString. The font style used is Arial 48 points, regular, I think. The picture in PictureBox shows just as I configure. Great... The resolution of the original Terri Hatcher picture is 300 dpi (300 x 300). Exporting this picture with Graphics.DrawString, I get the picture below to the right. The text string appears a lot bigger than previously shown in PictureBox. It turns out that the text size varies, depending on the resolution of the original picture. That's kind of odd. I develop several graphics applications in a different environment and have never seen this sort of graphics.drawstring thing. Anyway,
my sample application seems to draw a text string at an image resolution of
[Code]...
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Nov 1, 2009
I have a very annoying problem, I am trying to draw an image with the Graphics class but when I do DrawImage, it automatically scales it up! heres some example code
graphics.DrawImage(My.Resources.TestImage, 20, 20)
PictureBox1.Image = My.Resources.TestImage
The picture box image is the correct size whereas the graphics drawn verison is too big!
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Feb 24, 2009
I made a program that uses the graphics object to draw on a picture box. I used the graphics.fromhwnd(picbox) to draw on the control. The problem is if I minimize the window the drawing disapears. Might there be a way I can the image from the picbox and save it to a bitmap variable ?
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Apr 4, 2011
Just want to know if it is possible to do an image mapping in VB2010?..
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Oct 4, 2011
When working with small images, the graphics interpolation does bad work.the result image in the following code does ignore second half of image to draw.Draw something on the image by using loadimage from JPG or whatever you want.
Dim GrayImage as system.drawing.Bitmap(640,480)
Dim bmTmp As New System.Drawing.Bitmap(GrayImage.Width, 1)
Using gr As System.Drawing.Graphics = System.Drawing.Graphics.FromImage(bmTmp)[code]....
The second half vertical is not drawn by using the DrawImage methode. I want to have the image as result as you see on first picture. Stretched image with source on whole content.
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Aug 21, 2011
I can get the image to rotate the problem is that on every step throught the loop the image goes to it inverse or draw backwards.
Code:
Public Class Form1
Public K As New Grid_Tiles
Public D As Integer
[code]....
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May 28, 2009
I have an application that downloads a .jpg snapshot from an IP camera, writes it to the server hard drive, attaches it to an email and sends it out to my users. Pretty simple until one guy had to mount his camera upside down and that's how he received the image via email.
It gets a bit annoying after a while, so he asked me if I could rotate it 180 degrees before attaching it to the email. I have absolutely no idea - hence my post. The app is on a hosted ASP.Net v3.5 web server.
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Feb 6, 2012
get the raw data of zoomed image in a picture box. But I am zooming the image using,e.Graphics.DrawImage(Picturebox.Image, New Rectangle(ZoomXCordinate, ZoomYCordinate, ZoomWidth, ZoomHeight)).Now I am not getting how to get the raw data of zoomed graphics image displayed on the Picturebox.I am actually trying to get the image data into a byte array.
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Sep 19, 2011
I am using VB.NET to try and capture a portion of the screen so I found this code in several places to capture the whole screen:
Dim screenSize = SystemInformation.PrimaryMonitorSize
Dim bitmap = New Bitmap(screenSize.Width, screenSize.Height)
Using g As Graphics = Graphics.FromImage(bitmap)
g.CopyFromScreen(New Point(0, 0), New Point(0, 0), screenSize)
End Using
bitmap.Save("c:scratchscreenshot.png", System.Drawing.Imaging.ImageFormat.Png)
This works with no error throw and the file is created successfully but the resulting image is completely transparent (it is the correct size) - This question relates to the same error but the solution is to use Win32 GDI which I want to avoid if possible
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Nov 23, 2011
I have 1 image in picturebox. Now I draw some rectangles. I'm trying clear the image (only rectangles and left the image) without success.
Private Sub btnImageSelection_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnImageSelection.Click
Dim intImages As Integer = 0
Dim intImagesLine As Integer = 0
Dim intImagesColune As Integer = 0
picImage.Image = PictureBox1.Image
[Code] .....
The cycles for is for show the rectangules and works fine. but
i.Clear(Color.Blue)
The image is clear but the rectangles are showed and then unshowed.
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Jun 6, 2011
I have a scanned document in my system. It's a tiff file. You will see below the code i have written. The problem is that i get an error message. The message is like this "A Graphics object cannot be created from an image that has an indexed pixel format." [Code]
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Feb 20, 2009
How do I flip the image upside down (below the first image) Like as if a house were at the waters edge and you can see the house, and the reflection in the water?
code for drawing the image (which is a battery)
VB
'Finding center'
Dim batX As Integer = 160 - (imgDct(cbo_Battery.Text).Width / 2)
Dim batY As Integer = 200 - (imgDct(cbo_Battery.Text).Height / 2)
'Draw Battery
[Code]...
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Dec 10, 2010
I'm creating a Image viewer and was wondering if anyone could help me with resizing an image, and converting the image to grayscale? My knowledge of visual basics is very limited so any code snippets.I am wanting to resize the original image to a 3 x 3.
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Mar 1, 2010
I'm using below code 2 add image into a picturebox during the run time. i could add image but when i clicked the picture to make it become smaller, the picture quality is blur which not as the initial picture.
[Code]...
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Sep 11, 2009
how do i change the picture inside a picture box.I wanna make 5 dice that change when you press roll.. the number generator is easy i just wanna use graphics rather than a label to display the numbers.
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Mar 29, 2012
anyone know how to do this, but wit a browse for folder aspect..like i open up my browse for folder window, select the folder i want and it displays the .png file in picturebox..i'm trying to figure it out..here is what i have so far..i have it setup where i'm opening up a folder and loading certain files in my checkedboxlist..but i also want a .png file that is in the subfolders(the only .png file in the entire directory) to be displayed in the picturebox..but the folder is going to be changed depending on which folder is selected..so it can't be a set directory or path..basically has to change like the checkedboxlist.
[Code]...
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May 13, 2009
I am trying to draw an image from a MS Access database by use of e.Graphics.DrawImage(New Bitmap()). In my database Row 0 Item 1 holds the path to the image I want to draw.
My current code looks like this:
Code:
Private Sub pnlStart2_Paint(ByVal sender As Object, ByVal e As_ System.Windows.Forms.PaintEventArgs) Handles pnlStart2.Paint
e.Graphics.DrawImage(New Bitmap(ds.Tables("Track1").Rows(0).Item(1)), 3, 3)
End Sub
When I run my program I get the following message in my code: Illegal characters in path how I can draw the image from the database?
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Nov 16, 2010
What am i doing wrong on this code? im trying to get my form into a jpeg picture, but everytime it only saves a black screen of what im doing
Code:
Private Shared Function BitBlt(ByVal hdcDest As IntPtr, ByVal nXDest As Integer, _
ByVal nYDest As Integer, ByVal nWidth As Integer, ByVal nHeight As Integer, _
ByVal hdcSrc As IntPtr, ByVal nXSrc As Integer, ByVal nYSrc As Integer, ByVal _
[Code].....
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Sep 23, 2008
I am trying to verify that an image has been loaded into the picturebox1. I am loading the image from the web and need to verify it has arrived before I can save it to disk. If I save it to soon I will save nothing and that will crash the app. I have tried to use 'if PictureBox1.image = nothing then' ... 'End If', but that isn't a valid check. I can obviously not check picturebox1.image if it is empty or has an image.
So the question is, how do I verify that the file has finished loading?
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Jul 11, 2004
I am trying to incorporate in my vbdotnet application a form in which I would like to make a thumbnail from an image. So what I have is two picture boxes, one with the source image and the other with the destination image, I would like to crop the image from picture box 1 and display it on picture box 2, but the way I wan to crop it is not giving the coordinates of the selected area box but to simulate a selection area box in which the mouse can move the box and select the area of the picture to be cropped. This selection area box would give me the coordinates i need in order to proceed the cropping. The problem is I don't know how to create this selection area box. It is like doing the cropping on a graphic design software like Macromedia Fireworks, Adobe photoshop, even paint.
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Aug 13, 2008
I have a map image and i want to open it look like ACDSEE (very fast)my image is 12756 x 8504 pixel and i try backbuffer but not work for me.
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Aug 5, 2009
We are trying to get an image to a printer.Does someone any idea how to do that, or maybe someone has code?
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Jan 22, 2011
I vagely understand how to edit an image using Graphics. I can rescale an image using scaletransform but I want to be able to use a dynamic scale i.e., given an image with (x,y) coordinates, I want x_new = x_old + y*Factor so that when the image is stretched one end is stretched more than another.
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