I'm pulling images from the camera roll to display in my app, and portrait taken pictures work just fine, but landscape images get all funky smushed together.
UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
displayPhoto.image = image;
I've figured out how to check the length and width of the pictures themselves, and therefore can do an if else statement to only rotate landscape pictures... but trying to find working code to actually rotate the images is difficult. I found an answer here, but he's calling functions that don't exist, and clearly the code did not work for me :p. Any assistance would be greatly appreciated. Thanks.
u have to use
[displayPhoto setContentMode:UIViewContentModeScaleAspectFit];
Related
Shadow of UILabel"
I have tried this code
label.shadowColor = [UIColor blackColor];
label.shadowOffset = CGSizeMake(1.0, 1.0);
but i am unable to get the shadow, i have searched on the internet, but none answers well.
http://tinyurl.com/au4exlo , this is a reference site, where a shadow is there under each word.
Please correct my code if am wrong.
Thanks
I think these are two separate UILabels displaying same values but one is inverted. Additionally, the bottom UILabel is obscured by a half transparent PNG image.
If you are not familiar with Photoshop, This might give you idea about what I mean by half transparent gradient. http://thepowerpointblog.com/media/blogs/all/10_Sept/Lance_8.jpg
I want to display an image in a QGraphicsView with a QGraphicsScene. My code is very basic :
QGraphicsScene* scene = new QGraphicsScene(this);
scene->addPixmap(QPixmap(qApp->applicationDirPath() +"/france.gif"));
ui->myGraphicsView->setScene(scene);
ui->myGraphicsView->fitInView(scene->sceneRect());
My problem is that my picture has a wrong size. It is very small, with wrong proportions and on the center of my GraphicsView. With qDebug i kwow that my picture is load successfully and it has a size of about 100x800px. My graphicsView is smaller so i want to resize my picture to adjust it with my GraphicsView size.
The graphicsView is set in the mainwindow Form and the scene is declared in the header : "QGraphicsScene scene;"
I try everything is possible in the world (i think) but the graphicsView is alaways blank or contains the small version of the picture. When I copy/paste some codes of internet i always get this problem. I also try with this example : Qt GUI Development - Displaying a 2D grid using QGraphicsView , same problem...
Maybe i'm very very very tired but i really don't understand what is wrong. Help me please :)
sceneRect() may not be what you think it is unless you specifically set it. Also you are missing aspectRatioMode in fitInview call which can distort it image, sometimes resulting in "small" appearance.
QGraphicsScene* scene = new QGraphicsScene(this);
QGraphicsPixmapItem p = scene->addPixmap(QPixmap(qApp->applicationDirPath() +"/france.gif"));
ui->myGraphicsView->setScene(scene);
ui->myGraphicsView->fitInView(p, Qt::KeepAspectRatio);
From my experience, a shown image is very small if we try to fitInView before the scene window is displayed. Technically, the sceneRect size is not set in the way we want until it is actually shown. Therefore, we need to let the scene window shows up before we can properly use fitInView.
Well, I think the solution is available here
Qt5 C++ QGraphicsView: Images don't fit view frame
How to get CATransform3D from Projection and ModelView matrices
I have browse this question before，the url；but it wasn't absolutely precise; I want to know why it’s not precise；
I find that the rotate by x--axis and y--axis is opposite（I can't post image）；the Trapezoidal(when rotate the calayer , it's like a Trapezoidal) is opposite，dose calayer rotate is not like opengl？but it's right when rotate by z--axis.
I want get the Angle and then rotate it twice opposite；how to get Angle by the opengl matrices？
I want play movie by QCAR; I can get opengl matrices,and I want to use UIView to playe movie and other(Familiar with the UIView),and make UIview like Texture.
I just post a example on QCAR forum, you can check the detail here
The idea is simple.
1.I don't use avassetreader to read the video pixel, instead I use AVPlayer and AVPlayerLayer which can play remote video file.
2.I need to convert opengl modelview matrix to CATransform3D so the AVPlayerLayer will attach on the trackable image.Thanks for Hammer on stackoverflow, he shared an example about how to make this.
3.I tried to render camera background use opengl and AVPlayerLayer at same time, but the performace is not good enough, so I use another calayer to render the camera background. There is a bug in 1.5.8 when getting camera frame, thank for andersfrank the problem was solved here.
I put my code on pastebin:
http://pastebin.com/kmeVZ7jy
There are still some problem need to solve, but I think this is a right approach.
PS. For question 3 in my original post, you can fix it by set
cameraLayer.contentsGravity = kCAGravityResizeAspectFill;
This will fix the problem that the aspect ratio of the camera image is different with the iphone screen's.
Update
All the problem are solved, please check my original post on vuforia and pastebin.
I have an NSImageView in a view that utilizes Core Animation. Prior to using Core Animation the image looks fine but now its blurry and low quality. If I let NSImageView have a bezel border the issue goes away but I need it to have no border. Had this happened to anyone else?
Imgae in the background with no border, same image in the front with a border.
Thanks
EDIT: I forgot to mention that the image is an icon file (ICNS) so it has various sizes. The bordered view loads the correct size and the transparent one loads the smallest and stretches it.
Although not the way I wanted to, I managed to create a fix for the issue. The issue seemed to be the way that NSImageView was drawing the image so I created a custom NSView subclass with support for the same bindings I used in my original image view. Im not sure why the blurry-ness happend in the beginning, but drawing the image by hand in an NSView seems to do the trick.
Your image may be drawing in a non-pixel-aligned way. Have you tried shifting it by a half pixel?
Apple has a good demonstration of this in the BlurryView app in their "Cocoa Tips and Tricks" sample code.
Cocoa Tips and Tricks
I have an application that is set in landscape mode because of the content it contains. One of the things I want to do is take a picture of a piece of paper. I present the UIImagePickerController locked in portrait mode because it fits the paper size. After the user takes the picture I load that image as a background on a UIWebView. The reason I use a webview is because sometimes I need to load a .pdf there as well. Anyway, I'm setting the background using CSS. Here is the code...
//img is the path to an image.
myHtml = [NSString stringWithFormat:
#"<html><head>"
"</head>"
"<body><img src='%#'></body></html>", img];
[resume loadHTMLString:myHtml baseURL:baseURL];
The problem is, the image is displayed in landscape when the app returns to the UIWebView. Everything else is normal as far as text etc. Is there some reason that images are rotated 90 degrees to fit properly or something? I have tried pretty much everything with no luck.
The other thing is that we I retake a picture and reload the webView the old image remains.
You need to change the orientation of the image from its exif header if there is orientation info available in it. Identifying the picture orientation is the hard part, rotation of imgs can be done easily using css -webkit-transform: rotate(-90deg);
It does have to do with the exif data. While using a webkit transform may be ok for use in just the web view once, if you want to use the image later and have it always be the right orientation I'd use the categories given here:
http://vocaro.com/trevor/blog/2009/10/12/resize-a-uiimage-the-right-way/
The article does a great job explaining exactly why the rotation occurs and the code does a nice job of 'fixing' the 'problem' so that you can then make use of the image without having to do extra things or worry about whether it'll be displayed correctly (even though the UIImageView takes the orientation into account).
You can resize with this to the same size it originally was, and it should fix the orientation issue.