I've got a really simple setup - I have a string, a font and a font size on the ready. I want to render this to a Silverlight WriteableBitmap.
There's one catch - I want to be able to tell apart the letters in the rendered text. Ideally, I'd like to have a System.Windows.Rect for every rendered letter.
The problem is Silverlight's API, which is missing all of the useful stuff like Graphics.MeasureString, which I could have used to measure the letters separately.
What adequate options do I have to get the letters' measures in codebehind?
I sort of figured this out on my own. The solution is slow and far from perfect, but hey, it works!
The idea is to render the text many times, adding one letter at a time, and finding the difference between the current and previous TextBlock widths.
So, for example, if the text is "ab", we first render "a" and get its length. Then we render "ab" and find the difference, which should be the size of the rendered "b".
Related
I need to enter a text to existing pdf (in top or bottom of the page) in c#.
I need to make sure that I dont overwrite any visible text or image.
Is there any way I could check an area in pdf if it contains text, image, control etc? I understand it will not be 100% accurate
You're going to need a full PDF consumer at the very least, because the only way to find out where the marks are on the page is to parse (and possibly render) the PDF.
There are complications which you haven't covered (possibly they have not occurred to you); what do you consider to be the area of the PDF file ? The MediaBox ? CropBox, TrimBox, ArtBox, BleedBox ? What if the PDF file contains, for example, a rectangular fill with white which covers the page ? What about a /Separation space called /White ? is that white (it generally gets rendered that way on the output) or not ? And yes, this is a widely used ink in the T-shirt printing industry amongst others.
To me the simplest solution would seem to be to use a tool which will give you the BoundingBox of marks on the page. I know the Ghostscript bbox device can do this, I imagine there are other tools which can do so. But note (for Ghostscript at least); if there are any marks in white (whatever the colour space), these are considered as marking the page and will be counted into the bbox.
The same tool ought to be able to give the size of the various Boxes in the PDF file (you'd need the pdf_info.ps program for Ghostscript to get this, currently). You can then quickly calculate which areas are unmarked.
But 'unmarked' isn't the same things as 'white'. If you want to not count areas which are painted in 'white' then the problem becomes greater. You really need to render the content and then look at each image sample in the output to see if its white or not, recording the maxima and minima of the x and y co-ordinates to determine the 'non-white' area of the page.
This is because there are complications like transfer functions, transparency blending, colour management, and image masking, any or all of which might cause an area which is marked with a non-white colour to be rendered white (a transparency SMask for example) or an area marked with white to be rendered non-white (eg a transfer function).
Your question is unclear because you haven't defined whether any of these issues are important to you, and how you want to treat them.
I am working with code to create a custom image that displays words in curved text around a circle (think a CD label).
The code is not working with Arabic words. It utilizes the System.Drawing.Graphics class to do a character-by-character rendering, adjusting the angle as it goes. The problem is, once the word gets broken up into characters, they all become isolated form characters.
As an example (the English translation is Engagement):
It seems like the implementation would work with a positional-aware char object, but I couldn't find anything of that nature, nor could I find any method for rendering a curved word without going character-by-character.
How can I render Arabic words on a curved line while retaining positional forms for the characters?
Welp sorry for the late answer, but i think you may create a method to loop throgh the arabic characters and do what to do.
Suddenly i found this, which worked for my xna game very well
https://github.com/Konash/arabic-support-unity/blob/master/Assets/ArabicSupport/Scripts/ArabicSupport.cs
The default size in pixels for a tab in a RichTextBox is apparently 48 pixels, regardless of font or font size. This is set as default by .NET without me touching the SelectionTabs array. I've checked in the RTF - there's no \tx control code or anything so where the heck is this elusive '48' number stored?
I don't want to use this as a hardcoded 'magic number' in case other systems use something other than 48 pixels for a tab.
My own purpose is to help me convert from tabs to spaces (at least for fixed width fonts). But finding an answer to this also might get us closer to controlling the tab size with a single value without setting up an 'infinite' array of tab stops as implied from this answer.
Basically, what I'm trying to do is get an image to represent a page (for quick browsing in a XAML GridView).
I have the pages URL (and it's HTML content), but now I'm not completely sure how to proceed. I could just use the Favicon, but I don't think that would scale well up to the 200x200 box I'm using to display it. The other option (as far as I can think of) is to look through the HTML source and pick out the largest image.
Is there an easier/simpler way to do that in C# other than just using Regexs to find the height/width of all the image tags and then comparing them?
Thanks!
There is no way to know for sure from the HTML source what size the images are. An img tag doesn't require the height and width parameters. If they're not specified, then the image is displayed in its actual size. If all the img tags on the page have their height and width specified, you could pick the one that has the largest values. But those are the display sizes. The actual sizes might be quite different.
The only way to be 100% sure is to download each image and get its size.
By the way, if you're parsing HTML, you probably shouldn't be doing it with regular expressions. I know it seems simple enough, but you're almost certain to get things wrong and not handle some common cases. You'll save yourself a lot of time and frustration by using something like the Html Agility Pack.
you can try
imageObject.ActualWidth
imageObject.ActualHeight
properties
I set up a draw rectangle to draw simple formatted text first aligned to the left as
*item 1
[1]Something
content
[2]Something else
<a> subsomething else
content
<b> another subsomething else
content
*item 2
The end.
and I would also like it to automatically create a new column (after checking for the longest string in the first column [drawn stuff on the left hand side]) to draw the rest into it.
In order to keep track of the paddings and itemized sections and subsections, I think of using a stack which I can push and pop the current and next positions needed to draw a text line each time I leave a content. Yet, I can't figure out how to jump back to a certain subsection position because stack doesn't offer an inline sub-scripting method.
Then I look into a hash-map (in C# I have tried Dictionary) to keep track of it and to access the value via specific key. For that I also use a external global variable to maintain the number of subsections the user may have entered and increase one each time a new subsection is created; and the float value is used to store the x-coordinate value for the drawstring to be done. This is complicated to me at least at present when I don't really have a nerve to go into it anymore. I can only receive false simulated outcomes.
So I am asking for an easier approach to tackle this problem, which I think is simple to many of you sure experiencing the same situation. I am desperately looking forward to seeing a short easy method to do this.
Draw formatted text using ..
..whatever works. I suggest a JLabel, which will render (simple) HTML/CSS formatted content.
See LabelRenderTest.java for an example.