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  • Creating a mask from a graphics context

    - by Magic Bullet Dave
    I want to be able to create a greyscale image with no alpha from a png in the app bundle. This works, and I get an image created: // Create graphics context the size of the overlapping rectangle UIGraphicsBeginImageContext(rectangleOfOverlap.size); CGContextRef ctx = UIGraphicsGetCurrentContext(); // More stuff CGContextDrawImage(ctx, drawRect2, [UIImage imageNamed:@"Image 01.png"].CGImage); // Create the new UIImage from the context UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); However the resulting image is 32 bits per pixel and has an alpha channel, so when I use CGCreateImageWithMask it doesn't work. I've tried creating a bitmap context thus: CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray(); CGContextRef ctx =CGBitmapContextCreate(nil, rectangleOfOverlap.size.width, rectangleOfOverlap.size.height, 8, rectangleOfOverlap.size.width , colorSpace, kCGImageAlphaNone); UIGraphicsGetImageFromCurrentImageContext returns zero and the resulting image is not created. Am I doing something dumb here? Any help would be greatly appreciated. Regards Dave

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  • iphone problem adding splashscreen

    - by zebra
    hi all, i've a little problem, i've add a default.png in my app and it work. I've modify my file, delete file and reference and upload my new file. On my iphone the image does not appear, only some second of blackscreen and after my app start. In the simulator the splashscreen appear. I've try to delete my app on iphone, make a clean all and rebuild & install but nothing... I've try to make clean all, close xcode, delete default.png to my project directory (sometimes exist, sometimes no), open xcode, add my file and build & install on my iphone but nothing... Any ideas?

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  • Foreach loop is running n times

    - by Furqan Khyraj
    foreach($CarAdList as $CarAd) { echo($msg .= '<tr><td>'.$CarAd->getCarAdID().'</td><td>' .$CarAd->getBrandText().'</td><td>' .$CarAd->getDescription(). '</td><td><a href="status.php?id='.$CarAd->getCarAdID().'"><img src="../images/active.png" /></a></td><td><img src="../images/delete.png" width="30px" /></td></tr>'); } e.g, the number of rows =38 n= the number of rows * the number of rows-- it is running n times so its displaying 5 5 4 5 4 3 5 4 3 2 5 4 3 2 1

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  • Preload Images with javascript

    - by user271619
    Here is my preload script: <script type="text/javascript"> Image_1 = new Image(1,1); Image_1.src = "images/sprites.png"; </script> And it works fine. I can see in the headers the image loading. Here's my question. Even though I have preloaded sprites.png, I notice that when I go to a page on my site that simply displays that entire image, the headers tell me my browser is requesting the server to send the image again. I'm hoping to not sound too naive. But, why would the browser request the image when I preloaded it earlier? Are there other reasons the browser would need to re-request? Also, I put the dimensions as Image(1,1). Sometimes I don't know the dimensions, as that image gets updated from time to time. Maybe that's a reason?

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  • multiline gtk.Label ignores xalign=0.5

    - by thomas
    A gtk.Label can't be aligned in center when line-wrap is turned on. Example code: import pygtk pygtk.require('2.0') import gtk class testwin(gtk.Window): def __init__(self): gtk.Window.__init__(self) width,height = 300,300 self.set_size_request(width,height) self.set_position(gtk.WIN_POS_CENTER) self.set_title("test window") label = gtk.Label("test text") label.set_line_wrap(True) label.set_justify(gtk.JUSTIFY_CENTER) label.set_alignment(0.5,0.5) label.connect("size-allocate",lambda l,s: l.set_size_request(s.width-1, -1)) self.add(label) self.connect("destroy", gtk.main_quit) self.show_all() testwin() gtk.main() It looks like this, that means, it's aligned left: http://m45.img-up.net/?up=pic122x97.png If you comment out line 14 (set_line_wrap) everything is perfectly fine: http://o54.img-up.net/?up=pic2y00p9.png Please note that yalign works fine. So it seems like the first argument in the gtk.Misc.set_alignment-function has no effect when line wrap is turned on. Using Fedora 16, 64bit, gtk 3.2.4, pygtk 2.24.0, python 2.7.2 Question: Is this intended or a bug? How is it supposed to be made or is a workaround available?

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  • How to get QWebKit to display image?

    - by George Edison
    Okay, I have a Qt executable in the same directory as a file logo.png. I call the following: QString msg("<html><body><img src='logo.png' /></body></html>"); webView->setHtml(msg); where webview is the QWebKit pointer However, when I execute the program, the image does not display. I am executing the program from the directory that the image is in... why won't it display?

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  • How to take a screenshot with Mono C#?

    - by vagabond
    I'm trying to use use code get a screenshot in Mono C# but I'm getting a System.NotImplementedException when I call CopyFromScreen. My code works with .NET, so is there an alternate way of getting a screenshot using Mono? Bitmap bitmap = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height); Graphics graphics = Graphics.FromImage(bitmap as Image); graphics.CopyFromScreen(0, 0, 0, 0, bitmap.Size); System.IO.MemoryStream memoryStream = new System.IO.MemoryStream(); bitmap.Save(memoryStream, imageFormat); bitmap.Save(@"\tmp\screenshot.png", ImageFormat.Png); I am using Mono JIT compiler version 2.4.2.3 (Debian 2.4.2.3+dfsg-2)

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  • Shadow maps unable to properly project shadows in some situations?

    - by meds
    In the shadow map sample provided by Microsoft I've noticed an issue where shadows are not properly projected when thin geometry is projected at high angles, see here the shadows being projected, notice the poles from the lights are not projected: http://imgur.com/QwOBa.png And in this screenshot we see things from the lights perspective, not ethe poles are clearly visible: http://imgur.com/k2woZ.png So two questions really, is this an actual bug or a limitation with shadow mapping and if it's a bug how can I fix it? The source is directly from the Microsoft DirectX Sample Browser 'ShadowMap' sample from July 2004, the sample browser is the latest August 2009 one.

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  • Extended with advice: Moving block wont work in Javascript

    - by Mack
    Hello Note: this is an extension of a question I just asked, i have made the edits & taken the advice but still no luck I am trying to make a webpage where when you click a link, the link moves diagonally every 100 milliseconds. So I have my Javascript, but right now when I click the link nothing happens. I have run my code through JSLint (therefore changed comaprisions to === not ==, thats weird in JS?). I get this error from JSLink though: Error: Implied global: self 15,38, document 31 What do you think I am doing wrong? <script LANGUAGE="JavaScript" type = "text/javascript"> <!-- var block = null; var clockStep = null; var index = 0; var maxIndex = 6; var x = 0; var y = 0; var timerInterval = 100; // milliseconds var xPos = null; var yPos = null; function moveBlock() { if ( index < 0 || index >= maxIndex || block === null || clockStep === null ) { self.clearInterval( clockStep ); return; } block.style.left = xPos[index] + "px"; block.style.top = yPos[index] + "px"; index++; } function onBlockClick( blockID ) { if ( clockStep !== null ) { return; } block = document.getElementById( blockID ); index = 0; x = number(block.style.left); // parseInt( block.style.left, 10 ); y = number(block.style.top); // parseInt( block.style.top, 10 ); xPos = new Array( x+10, x+20, x+30, x+40, x+50, x+60 ); yPos = new Array( y-10, y-20, y-30, y-40, y-50, y-60 ); clockStep = self.SetInterval( moveBlock(), timerInterval ); } --> </script> <style type="text/css" media="all"> <!-- @import url("styles.css"); #blockMenu { z-index: 0; width: 650px; height: 600px; background-color: blue; padding: 0; } #block1 { z-index: 30; position: relative; top: 10px; left: 10px; background-color: red; width: 200px; height: 200px; margin: 0; padding: 0; /* background-image: url("images/block1.png"); */ } #block2 { z-index: 30; position: relative; top: 50px; left: 220px; background-color: red; width: 200px; height: 200px; margin: 0; padding: 0; /* background-image: url("images/block1.png"); */ } #block3 { z-index: 30; position: relative; top: 50px; left: 440px; background-color: red; width: 200px; height: 200px; margin: 0; padding: 0; /* background-image: url("images/block1.png"); */ } #block4 { z-index: 30; position: relative; top: 0px; left: 600px; background-color: red; width: 200px; height: 200px; margin: 0; padding: 0; /* background-image: url("images/block1.png"); */ } #block1 a { display: block; width: 100%; height: 100%; } #block2 a { display: block; width: 100%; height: 100%; } #block3 a { display: block; width: 100%; height: 100%; } #block4 a { display: block; width: 100%; height: 100%; } #block1 a:hover { background-color: green; } #block2 a:hover { background-color: green; } #block3 a:hover { background-color: green; } #block4 a:hover { background-color: green; } #block1 a:active { background-color: yellow; } #block2 a:active { background-color: yellow; } #block3 a:active { background-color: yellow; } #block4 a:active { background-color: yellow; } --> </style>

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  • Android ignoring my setWidth() and setHeight()

    - by popoffka
    So, why does this code: package org.popoffka.apicross; import android.app.Activity; import android.os.Bundle; import android.widget.Button; public class Game extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Button testButton = new Button(this); testButton.setBackgroundResource(R.drawable.cell); testButton.setWidth(20); testButton.setHeight(20); setContentView(testButton); } } ...produce this thing: http://i42.tinypic.com/2hgdzme.png even though there's a setWidth(20) and setHeight(20) in the code? (R.drawable.cell is actually a 20x20 PNG image containing a white cell with a silver border)

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  • Avoid flickering on mouse over

    - by GigaPr
    Hi I have a simple link in a menu <a id="Home" href="Amico-Bio-Home-Page"></a> to which i apply the following style #Home{ background-image:url(../Images/Menu/home.png); background-repeat:no-repeat; border:none; display:block; height:70px; text-decoration:none; width:78px; float:left; padding:0 7px; } #Home:hover { background-image: url(../Images/Menu/homeOn.png); } when i go over the link the images are swapped. while swapping the images the link disappear for an instant. Do you know any way to avoid it? thanks

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  • CKEditor adds html entities to inline CSS. Is the CSS still valid?

    - by Mihai Secasiu
    I have this piece of code: <table style="background-image: url(path/to_image.png)"> And when I load it in CKEditor it's transformed in: <table style="background-image: url(&quot;path/to_image.png&quot;)"> Is this still still valid CSS? Actually I'm not so interested if it's valid but if there would be any problems with any web browser or email client ( the editor is used for composing a html email ). Firefox and Thunderbird seem to be fine with it.

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  • ASP.NET MVC download image rather than display in browser

    - by RSolberg
    Rather than displaying a PNG in the browser window, I'd like the action result to trigger the file download dialogue box (you know the open, save as, etc). I can get this to work with the code below using an unknown content type, but the user then has to type in .png at the end of the file name. How can I accomplish this behavior without forcing the user to type in the file extension? public ActionResult DownloadAdTemplate(string pathCode) { var imgPath = Server.MapPath(service.GetTemplatePath(pathCode)); return base.File(imgPath, "application/unknown"); }

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  • Using Website Information Without WebView

    - by Mr. Monkey
    I am very new to this, and I more looking for what information I need to study to be able to accomplish this. What I want to do is use my GUI I have built for my app, but pull the information from a website. If I have a website that looks like this: (Sorry, can't post pics yet) http:// dl.dropbox.com/u/7037695/ErrorCodeApp/FromWebsite.PNG (full website can be seen at http://www.atmequipment.com/Error-Codes) What would I need from the website so that if a user entered an error code here: http:// dl.dropbox.com/u/7037695/ErrorCodeApp/InApp.PNG It would use the search from the website, and populate the error description in my app? I know this is a huge question, I'm just looking for what is actually needed to accomplish this, and then I can start researching from there. -- Or is it even possible?

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  • How do I make a simple image-based button with visual states in Silverlight 3?

    - by Jacob
    At my previous company, we created our RIAs using Flex with graphical assets created in Flash. In Flash, you could simply lay out your graphics for different states, i.e. rollover, disabled. Now, I'm working on a Silverlight 3 project. I've been given a bunch of images that need to serve as the graphics for buttons that have a rollover, pressed, and normal state. I cannot figure out how to simply create buttons with different images for different visual states in Visual Studio 2008 or Expression Blend 3. Here's where I am currently. My button is defined like this in the XAML: <Button Style="{StaticResource MyButton}"/> The MyButton style appears as follows: <Style x:Key="MyButton" TargetType="Button"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="Button"> <Image Source="/Assets/Graphics/mybtn_up.png" Width="54" Height="24"> <VisualStateManager.VisualStateGroups> <VisualStateGroup x:Name="FocusStates"> <VisualState x:Name="Focused"/> <VisualState x:Name="Unfocused"/> </VisualStateGroup> <VisualStateGroup x:Name="CommonStates"> <VisualState x:Name="Normal"/> <VisualState x:Name="MouseOver"/> <VisualState x:Name="Pressed"/> <VisualState x:Name="Disabled"/> </VisualStateGroup> </VisualStateManager.VisualStateGroups> </Image> </ControlTemplate> </Setter.Value> </Setter> </Style> I cannot figure out how to assign a different template to different states, nor how to change the image's source based on which state I'm in. How do I do this? Also, if you know of any good documentation that describes how styles work in Silverlight, that would be great. All of the search results I can come up with are frustratingly unhelpful. Edit: I found a way to change the image via storyboards like this: <Style x:Key="MyButton" TargetType="Button"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="Button"> <Image Source="/Assets/Graphics/mybtn_up.png" Width="54" Height="24" x:Name="Image"> <VisualStateManager.VisualStateGroups> <VisualStateGroup x:Name="FocusStates"> <VisualState x:Name="Focused"/> <VisualState x:Name="Unfocused"/> </VisualStateGroup> <VisualStateGroup x:Name="CommonStates"> <VisualState x:Name="Normal"/> <VisualState x:Name="MouseOver"> <Storyboard Storyboard.TargetName="Image" Storyboard.TargetProperty="Source"> <ObjectAnimationUsingKeyFrames> <DiscreteObjectKeyFrame KeyTime="0" Value="/Assets/Graphics/mybtn_over.png"/> </ObjectAnimationUsingKeyFrames> </Storyboard> </VisualState> <VisualState x:Name="Pressed"> <Storyboard Storyboard.TargetName="Image" Storyboard.TargetProperty="Source"> <ObjectAnimationUsingKeyFrames> <DiscreteObjectKeyFrame KeyTime="0" Value="/Assets/Graphics/mybtn_active.png"/> </ObjectAnimationUsingKeyFrames> </Storyboard> </VisualState> <VisualState x:Name="Disabled"/> </VisualStateGroup> </VisualStateManager.VisualStateGroups> </Image> </ControlTemplate> </Setter.Value> </Setter> </Style> However, this seems like a strange way of doing things to me. Is there a more standard way of accomplishing this?

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  • vb.net array for slideshow button

    - by StealthRT
    Hey all, i am in the middle of trying to figure out how to go about doing this... I have a form that i call like so: call frmSlideShow.showWhat(1,4,8,9,11,22) Each of the numbers represents a different image slide (slide1.png, slide4.png, etc..). The problem i am having is trying to create a "previous" and "next" button to flip through them all. Trying to figure out what number the user is on and going from there and seeing what numbers are still left from the list above that was sent, etc. If anyone has an idea how i would go about doing that then that would be awesome! :) David

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  • Iphone UIButton not working in nested UIViews

    - by Charles Peterson
    This is so damn simple im sure! Im missing something and im exhausted from trying to fix it. hopefully someone can help. The Button in CharacterView.m works but the button nested down in CharacterMale.m does not. I'm not using IB everything is done progmatically. What would cause one button to work and other not? ///////////////////////////////////////////////////////////////////////////////// CharacterController.m ///////////////////////////////////////////////////////////////////////////////// #import "CharacterController.h" #import "CharacterView.h" @implementation CharacterController - (id)init { NSLog(@"CharacterController init"); self = [ super init ]; if (self != nil) { } return self; } - (void)loadView { [ super loadView ]; characterView = [ [ CharacterView alloc ] init]; self.view = characterView; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; } - (void)dealloc { [super dealloc]; } @end ///////////////////////////////////////////////////////////////////////////////// CharacterView.m ///////////////////////////////////////////////////////////////////////////////// #import "CharacterView.h" #import "CharacterMale.h" @implementation CharacterView - (id)initWithFrame:(CGRect)frame { if (self = [super initWithFrame:frame]) { characterMale = [ [ CharacterMale alloc ] init]; [self addSubview: characterMale]; UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; button.frame = CGRectMake(0, 200, 200, 100); [button setImage:[UIImage imageNamed:@"btnCharSelect.png"] forState:UIControlStateNormal]; [button addTarget:self action:@selector(ApplyImage:) forControlEvents:UIControlEventTouchUpInside]; [ self addSubview: button ]; } return self; } - (void)drawRect:(CGRect)rect { } -(void)ApplyImage:(id)sender { NSLog(@"CharacterView button works"); } - (void)dealloc { [super dealloc]; } @end ///////////////////////////////////////////////////////////////////////////////// CharacterMale.m ///////////////////////////////////////////////////////////////////////////////// #import "CharacterMale.h" #import "CharacterController.h" @implementation CharacterMale - (id)init { self = [ super init]; if (self != nil) { UIImage *image = [UIImage imageNamed:@"charMale.png"]; imageView = [[ UIImageView alloc] initWithImage:image]; [image release]; [ self addSubview: imageView ]; UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; button.frame = CGRectMake(0, 0, 200, 100); [button setImage:[UIImage imageNamed:@"btnCharSelect.png"] forState:UIControlStateNormal]; [button addTarget:self action:@selector(ApplyImage:) forControlEvents:UIControlEventTouchUpInside]; [ self addSubview: button ]; } return self; } -(void)ApplyImage:(id)sender { NSLog(@"CharacterMal button works"); } - (void)dealloc { [super dealloc]; } @end

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  • Why is this leaking memory? UIImage `cellForRowAtIndexPath:`

    - by Emil
    Hey. Instruments' Leaks tells me that this UIImage is leaking: UIImage *image = [[UIImage alloc] initWithContentsOfFile:[imagesPath stringByAppendingPathComponent:[NSString stringWithFormat:@"/%@.png", [postsArrayID objectAtIndex:indexPath.row]]]]; // If image contains anything, set cellImage to image. If image is empty, try one more time or use noImage.png, set in IB if (image != nil){ // If image != nil, set cellImage to that image cell.cellImage.image = image; } image = nil; [image release]; (class cell (custom table view cell) also releases cellImage in dealloc method). I haven't got a clue of why it's leaking, but it certainly is. The images gets loaded multiple times in a cellForRowAtIndexPath:-method. The first three cells' image does not leak (130px high, all the space avaliable). Leaks gives me no other info than that a UIImage allocated here in the code leaks. Can you help me figure it out? Thanks :)

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  • Problem linking SDL_Image against libpng

    - by Tim Jones
    I'm trying to compile SDL_Image 1.2.10 with MinGW + MSys (gcc 4.5.0) on Windows, I have compiled all the requires libs (zlib 1.2.5, libpng 1.4.2, libjpeg 8a, libtiff 3.9.2). SDL_Image compiles fine, but fails to link to libpng, throwing .libs/IMG_png.o:IMG_png.c:(.text+0x16): undefined reference errors on various png structs. If I run ./configure --prefix=/mingw --disable-png for SDL_Image, it compiles and links against the other libs just fine. I have tried older versions of libpng (1.2.43), but they also caused SDL_Image to throw the same errors.

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  • Warning: Cannot modify header information - headers already sent by

    - by bhaskaragr29
    When i try run this file i am getting this error. <?php $im = imagecreatetruecolor(100, 100); // sets background to red $red = imagecolorallocate($im, 255, 0, 0); imagefill($im, 0, 0, $red); header('Content-type: image/png'); imagepng($im); imagedestroy($im); ?> Warning: Cannot modify header information - headers already sent by (output started at C:\xampp1\htdocs\check\2.php:1) in C:\xampp1\htdocs\check\2.php on line 7 ?PNG ??? IHDR???n??????V,????PLTE????[an????fIDAT?c`?`fx???`?????41???????q?@?;{á0? ?i

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  • How can I display locally stored images on an internet website?

    - by ropstah
    Hi, i would like to display images on my website that are stored on a visitors local filesystem. Assuming I have the location of the image on the visitors drive (e.g. c:\Documents And Settings\Ropstah\image.png), is it then possible for me to display this image in my internet website (e.g. www.website.com)? The images won't seem to load when i use the following syntax (Internet Explorer 7, Firefox 3 etc..): <img src="file://c:\Documents and Settings\Ropstah\image.png" /> The images DO display if the .html file (which i use on website.com/index.html) is located on my local pc...

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  • TileGroup does not fill the container

    - by Luo Yong
    I put a TileGroup in a BorderContainer and set the width to 100%, but the content in the TileGroup did not fill the parent container, it leaves a big chunk of blank on the right part. The code is: <s:BorderContainer width="100%" height="100%"> <s:TileGroup width="100%" requestedColumnCount="2"> <s:Button> button1 </s:Button> <s:Button> button2 </s:Button> <s:Button> button3 </s:Button> </s:TileGroup> </s:BorderContainer> and the result is like this: http://i.minus.com/iN39P7Us4cBm1.png The width is already set to 100% but it does not work. Is there any way to make the TileGroup fill the container like GridLayout does in Java swing? http://www.java2s.com/Code/JavaImages/GridLayoutPane.PNG Thank you very much.

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  • jquery selector help... thought I followed the example correctly...but can't get it to work..

    - by Ronedog
    I'm trying to do the following in jquery but can't make it work . I want to select all the DIV tags that have a custom attribute called NODE_ID that have a value of 49_3. then select the and change the src attribute to a different image. Here's the HTML: <div style="display: block;" id="71_7_sub_p_div" node_id="49_3"> <span> <img src="../images/maximize.png"> &nbsp;Greenfield Industrial Park </span> </div> Here's the script: <script type="text/javascript"> $(document).ready(function(){ $("div[node_id='49_3']:has(img)").attr("src","../images/folder_closed.png"); }); </script> Any ideas are appreciated. thanks.

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