C# - Enable Me To Render Rotated Text With The TextRenderer.DrawText Method?
Oct 6, 2010
I'm using some code to enable me to render rotated text with the TextRenderer.DrawText method. (By default, DrawText can only copy a straight forward x and y transform from a graphics object).
The code (C#) is from: connect.microsoft.com. See below for a VB conversion.The code takes a graphics object, creates a device context and copies the transform matrix from the graphics object. It works, but I'd like, also, to set the TextRenderingHint, so I tried:
<DllImport("gdiplus.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)> _
Public Shared Function GdipSetTextRenderingHint(ByVal graphics As HandleRef, ByVal textRenderingHint As System.Drawing.Text.TextRenderingHint) As Integer End Function And then after the SetClip statement, I place: GdipSetTextRenderingHint(hDC, someHint) This gives me a memory access violation error, so I think I should be using something other than hDC as the argument.
I can get it to work by creating the device context from the original graphics object, and then creating another graphics object from the device context. I then set the hint on the new graphics object. This seems a bit convoluted so I was wondering if it was possible through interop.
Drawing text on a picbox I notice if the picbox has a border style set then the TextRenderer.DrawText rectangle area needs to be adjusted slightly otherwise text may be drawn very near the picbox borders and the text doesn't look as clean, but I'm not sure what those offsets should be, I hard coded them in, see code under "' area to draw". btw, the code draws the first word of text in bold and then the other words as regular. 'One button, One picture box needed.
I want to use the added functionality (for word wrap etc) of the TextRenderer.DrawText method.... but this does not seem to work correctly on the Graphics object in the PrintPage event in the PrintDocument Object and does not take into consideration any transformations that have been applied. Does anyone have a replacement way or workaround for this?
The following code does not appear to draw text properly to the bitmap. The text is rendered bold and anything but "clear". Can someone please help? I've searched all over the web for a solution and have not been able to locate one.The Code:
I've been looking for a simple example to print rotated text, without having to create paths and such, just by applying a temporary transformation to the page. My simple example would be to print "Rotated Text" in a circle patern with the bottom-left corner of the "R" being the anchor point around which the text rotates, something like:
Private Sub Form1_Paint(ByVal sender As Object, ByVal e As _ System.Windows.Forms.PaintEventArgs) Handles Me.Paint Dim poMatrix As System.Drawing.Drawing2D.Matrix Dim poState As System.Drawing.Drawing2D.GraphicsState Dim pfAngle As Single Dim piX As Integer 'x/y position to print Dim piY As Integer Dim poG As Graphics piX = 200
I cannot work out why the textrenderer method will not work?I have refined it down to the bare basics in the following example. Paste this code into a form (form3) that has a picturebox control (picturebox1).There is a blue swiggly line beneath the textrenderer "keyword", and a mouse hover message says "Name 'Textrenderer' is not declared"? I know that there are other methods, but I want to solve this textrenderer mystery.
I'm working on a website that creates pdfs dynamically.I've been playing around with two different pdf controls- wpcubed and abcpdf, and was surprised to see that they both appear to render text differently.
wpCubed: abcpdf:
They are both using arial 25pt bold, so I was expecting them to look identical. Can anyone explain why they don't. Here are the full files: wpCubed , abcpdf
I've got a timer which ticks every half a second. It calls a background process which renders text as icons and uses them for notification icons.
Public Shared DISCUS(9) As NotifyIcon Private Sub BackgroundProcess2_DoWork() Handles BackgroundProcess2.DoWork Try For counter As Integer = 0 To My.Computer.FileSystem.Drives.Count - 1 Dim FontColor As Color [Code] .....
Now for some reason, after a few minutes of the application being active, I get a JIT pop-up that doesn't render any text or buttons. Clicking on it causes the JIT debugger to crash, and I get the Windows "{App} has stopped responding." with error code CLR20R3. I'm not sure what this is all about, but I can provide any other details if needed. I've got everything nested in Try/Catch statements, all with code to write to a crash log but nothing gets written and I still get that error message.
I need to constantly display large amounts of colored text in WPF or Silverlight, and I need the user to percieve it as showing up instantly.
Currently I'm doing this using a canvas and textblocks, one textblock per 80-character line, with multiple runs to a textblock to handle the different colors. There can often be 20+ runs to a line.
In a 45x80 grid of text, this gets a framerate of about 12 in Silverlight, which is sluggish. Oddly enough, it's even slower in WPF... I can only speculate that this has something to do with my dev machine's lousy video card. Maybe it's trying to hardware accelerate and actually slowing down because of it?
I'd like to make a custom control that allows the end user to format the text, similar to an HTML or RichText control. The idea is that it will be static like a label, but allow end user to specify certain tags around words to make them bold, italic, underline, hyperlink, etc, either at design time or runtime. My question more specifically is how to best approach this. My intention is to use GDI+ methods, like DrawString, etc. But my concern is the inefficiency of having to parse the text each Paint cycle to determine which tags are present in order to use the correct font style, etc. I'm not really asking HOW to do this, but more of a hint on which architectural approach to take on this. Maybe there is already some examples of this out there?
i'm working on a simple 2d drawing application that allows you to draw, move, rotate and resize shapes such as lines, rectangles, ellipses, polygons and so on. My code for resizing shapes works fine, but only for unrotated shapes. Now i've changed the code to work also with rotation but i have still some problems, for example:
I create a rectangle at a specified location (the upper-left corner of the rectangle) and with a rotation around the location. With my code i can only to resize this shape using the top-left, the middle-right, the bottom-right and the bottom-center hot spots. The problem is when i try to resize the rectangle using the middle left hot spot or the other ones. As you can see in this images the problem is to calculate the new location that the rectangle should have after the resize operation.
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?
I want to allow the user to enable or disable a textbox by clicking either a button (enable) or the reverse. (disable) if the user clicks the enable button the textbox should receive the focus.
How can i draw text(demo demo) with 180 degrees format on exist image(on photo) in windows based applicaiton using vb.net. (Here rotate text(demo demo is displaying text on exist image) with 180 degrees formate then display on exist image)
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!
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
I'm making a game that needs to hit test a Rect object inside 4 points that basically forms rotated a rectangle. This means I can't use the Rect class's IntersectsWith function to hit test. So my question is: if I have 4 points that creates an imaginary rectangle of any orientation, how can I tell if another rectangle is inside the "fence" so to speak?
I have this program I'm working on, and I was wondering if it was possible to disable/enable TextBoxes when specific words are wrtten. I tried doing this, but it errored. I'm a new programmer to VB, I just started a month ago, and I'm doing this for fun.
If TextBox1.Text = "Shutdown" then TextBox2.Enabled = True
I also want it so that you don't have to press a button to identify if it is the right text, so it could "scan" automatically.
VB 2005 I have a tab control, with 2 tabs (Tab1 & Tab2), I need to use a textbox from Tab 2 Before I ever select to display it. is there a way to initialize the text boxes in the unopened tabs?
I want to make a panel or a picturebox which is vertically rotated by an angle in y-axis. The form's opacity should be 50% but panel opacity should be 100 that is panel should be clearly visible but form should should be 50% transparent.
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.)
I have a Radio Button List that lists different business categories. The last option is the Other category. When the user selects the Other category, I want to be able to enable a text box that the user can then enter further information to explain the Other selection.[code]...
