VS 2008 Draw Rotated Image On Graphics Object?
Jun 1, 2010
I know that you can pass a Point array to the DrawImage method of the Graphics object to apply rotation, skewing and flipping, but I'm having trouble figuring out how to calculate the rotation. So far I've got:
Dim radius As Integer = Math.Sqrt((rect.Width / 2) ^ 2 + (rect.Height / 2) ^ 2)
Dim dX As Integer = RadToDeg(Math.Cos(DegToRad(angle))) * radius
Dim dY As Integer = RadToDeg(Math.Tan(DegToRad(angle))) * dX
Dim new_upper_left_corner As New Point(rect.X + (rect.Width 2) - dX, rect.Y + (rect.Height 2) - dY)
This is all just off the top of my head so far, I'm not sure if it's right. How do I calculate the other points on the rectangle, and is there a built-in VB.NET method that's much easier? (Apart from Graphics.RotateTransform, which is slow and also rotates around 0,0.)
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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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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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Mar 15, 2010
I want to draw a text with 32 bit transparency on a graphics object. When I try, I only get black color in the result.
If I try to draw a line with the same semitransparent color, it works perfectly.
I have this code:
lBitmap As New Bitmap(32, 32, PixelFormat.Format32bppArgb)
lGraphic As Graphics = Graphics.FromImage(lBitmap)
lGraphic.SmoothingMode = SmoothingMode.HighQuality
[Code]...
I was thinking it may be that SolidBrush does not support transparency, but I found a predefined brush named Transparent (Brushes.Transparent) that was a SolidBrush when I looked at it in debug. I tried to use Brushes.Transparent as the brush when drawing the text, and it was successfully not showing at all. That means I get full transparency to work, but not partial transparency.
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Jun 3, 2009
i am drawing a string to a graphics object in the eg below and then transfering it onto a e.graphics in the paint event of a panel... when doing this the font edges appear dodgey...
Here is some
Dim b As New Bitmap(100, 100)
Dim g As Graphics = Graphics.FromImage(b)
g.DrawString("Bla Bla Bla", New Font("Comic Sans MS", 18,FontStyle.Bold), New LinearGradientBrush(g.ClipBounds, Color.Red,
[code]....
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Aug 15, 2010
how can i correctly position a rotated image in an irregular region picturebox?
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Dec 17, 2010
I'm trying to rotate a mirror, which I represented by a line across a specific point. I translated the point of rotation to the center, rotated by an angle indicated in a text box and then translated it back to its original position.
Here is my code :
Quote:
HTML Code:
Dim theta As Single
Private Cntr_X_blu_Mirror As Single = 5
[Code].....
I hope the code is good. The problem I encountered is that the line becomes smaller and smaller as I rotate it. and that's bad! Sometimes it even grows longer [I think when I rotate it in the oposite direction!]
Also, when I rotate it at 90 degrees, the rotation does not resembles a 90 degree rotation. It seems to be inclined at 45 degrees instead!
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Apr 10, 2009
How do I draw an image respectively on the PictureBox control and Image object? Welcome to the All-In-One Code Framework! If you have any feedback,
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Sep 8, 2009
I'm writing a program that print images in full page. I.E, I print image on A4 paper, landscape. When I print an image without rotating it (the image IS landscape), the image uses all the space of the page, and is not cropped. it is OK. The print job is about 1.5 Mb. When I print an image WITH rotating it (the image IS PORTRAIT ), the image uses all the space of the page, and is not cropped. it is OK. The print job is about 28 Mb. The images are about 2000x3000 pixels, and stored in JPEG files (about 2.5 Mb each). I suppose that the 28 Mb should be the "uncompressed" size of the picture, and 1.5Mb, the compressed size...
By the way, When I look at the task manager, my application memory usage grows by job size, which seems to be OK. It grows either 1,5 Mb if no rotation is occured, and 25-30Mb when rotation occured.
Since I can print hundreds of image at once, my print queue will grow abnormaly if I need to rotate all
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Sep 30, 2009
Is there a way to create an image from a graphics object?
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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 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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Apr 15, 2009
crashed a while ago and i didn't bother fixing it since my new laptop was due to come shortly after, because of this i am a bit out of practise with Visual Basic .NET. My problem is that my application allows a user to draw a rectangle with their mouse on a picturebox called picimage. When the user is done drawing their rectangle and tries to draw another one the previous rectangle gets deleted. I was playing around a bit with the
vb.net
Public Class Form1
Dim DrawRectangle As Boolean = False
[code].....
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Feb 18, 2011
is it possible for an image or picture to be rotated via button click.?
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Aug 15, 2010
I have a image with a transparent background. I clone it, rotate it, and save it in a picture box. Works fine (in that I can see the original object overlaid on the background image below it). However, the original unrotated image is also superimposed on the .image layer *with* the rotated one. Try as I can, I can't stop it from appearing.
Curiously enough, if I change the image to non-transparent (a .bmp instead of a .gif, for example), I don't have the problem. Of course, I also can't see the background {:<(
Code snippet:
Dim myGraphic As Graphics
Dim m As Image
m = ArtHorImage.Clone
[Code]....
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Sep 4, 2011
I want to draw an image onto another image object but use an alphamask specified from another image that is grayscale.
I am drawing an animation manually so don't want to do this pixel by pixel as this would be extremely inefficient.
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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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Jun 3, 2009
i have drawn on a e.graphics object and now want to transfer the drawn stuff onto a bitmap object how can i do this?
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Feb 7, 2012
[code]...
but, how to draw in picturebox? i use this code but not working!
[code]...
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Oct 21, 2009
Is it possible to have a picture box and draw on a line on top of the image that is in there with the basic express package?
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Dec 26, 2009
I want to know if there's a faster way to draw images onto a picturebox based on a list of point.
vb
Dim MyPoints as New List(Of Point)
Dim MyBitmap as New Bitmap("C:MyBitmap.PNG")
[code]....
Now, This code may be a little sloppy, but I just put it together. The image isn't very simple, but it's simple enough. After about 10 images that need to be drawn, it starts to get slow.What would I need to do to ensure it draws the images faster? If I made the image itself smaller would it make it go faster?
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Jun 16, 2009
I need to know how to draw a bitmap image into a certain area in a picturebox, I also need it to be a specific size. I remember seeing it on the internet somewhere, I just can't find it again.
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Oct 21, 2011
Just wondering how if it is possible to draw onto something, with GDI+, that can then be saved to some kind of vector format?
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Mar 24, 2009
I assume that this will be an easy one for you guys. I have never dabbled with drawing in VB.NET. I have searched the forum and Google already, but have turned up nothing to help me. Here is my problem. I have an image that is in an image box. I would like to draw a string of text on it, centered vertically and horizontally. Here is what I am using to draw the text.
[Code]...
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Aug 31, 2011
I need serious advice here please. I use Visual Basic Graphics Programming by Rod Stephens as a reference, and I have visited his site vb-helper.com to try some of his tutorials. I tried the scribble application and it's working out fine (you can download the snippet from his site).
What I have trouble with is zooming in. I am not sure where to start. I would like to zoom in to x2, x3 and etc. of the bitmap I am working on and I would like to be able to continue to edit the bitmap. This would mean that I have a larger pixel brush under the mouse cursor, to lay down pixels. So a x2 zoom would mean a 2 x 2 pixel.
Has someone done this. Do you have a reference I can use for this. This kind of editing is standard in almost every paint package. Even Microsoft Paint, but there is not too much basic information on how it fits together in code for vb .net. So I am looking for someone to point me in the right direction. As I said, I am using the scribble application as a base, so here is the link. [URL]..
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Jan 27, 2010
I'm currently working on a VB 2008 course of Michael Halverson, and I'm stuck at an assignment where I'll have to expand a previous wood order program so customers can add woodcuts to their orderIn the newer program a customer can define 4 coordinates (x & y for startpoint and x & y for endingpoint), after clicking on the button 'Next cut' a line will be drawn on screen (in PanelCuts) with a maximum of ten lines. After finishing, the coordinates must be saved in the order.txt, and when the client re-select the order in the main order program, they can review and adjust / remove the already specified cuts.Right now I'm at the point that the you can enter the coordinates, and the line will be drawn.
- What's the best way to store the submitted cuts, in a Label? array? or something else?
- When the form reloads, how to displays all previous made cuts? Can i count the numer of cuts and with For i = 1 to combined with SelectedItem. Split() ? [code]
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Jul 13, 2011
In my project I have a peculiar requirement for rotating a panel by a standard angel based on mouse drag event. how a panel can be rotated? Is it possible with "Rotate Transform" method?
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Sep 6, 2009
So, what I've got is a picturebox and a textbox, I got some code to put text into a picturebox so I could better understand how it works, but what I don't understand is how to put the text on top of the image that is in the picturebox, can anyone tell me how to do that? Here's the code
[Code]...
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Aug 21, 2010
Running VB/Studio? 2010 on XP. I draw on full screen resolution of 1920 wide x 1080 hi.I have set FormBorderStyle to NONE & WindowState to Maximize which seems to be the only way to get rid of the task bar.but w or wout this setting, My graphics draws a full screen twice - mostly repeatably.When I have [code] parameters set to use 9/16th of screen horizontally, the pattern is drawn once the first time I run it and usually once if I hit F5 quickly enough after hitting Alt-F4. But if I wait long enough [a second or 2] after 'Ready' appears at teh lower left of the IDE screen, then it draws the pattern 3 times.for wider patterns, 10/16th, 11/16 up to 16/16, which is 1920 pixels wide, it usually draws the pattern once after I make this parameter change and twice from there on. The 'twice' is repeatable; it 'doing it once' the first time is not a sure thing.
There are more peculiaraities than this, but if we can find causes for what I"ve given you, it might get them all wout making it seem more complicated than it is.I don't think it's in my code; it works - it draws the right thing the right number of times w no compiler errors. But here is the guts of it:
Public Class Form1
Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
e.Graphics.SmoothingMode = Drawing2D.SmoothingMode.HighQuality
[code]....
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Nov 29, 2011
I need to make a small application in asp.net where user could draw a small drawing and that drawing is saved in the database for later review.
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