I am new in Open GLES.
I got stuck at capturing the 3d object with its Background image.
I am adding the CAEAGLLayer view as subview in my view
and i am able to take the image of 3d object but it is coming with black background but i want to take the image of whole view on which i am showing my 3d object.
So please help me to resolve this issue.
You need to give more information. What is the background?
You use 1 view, it is EAGLView the I guess you should get the correct result.
You use EAGLView as subview of your background then you need to capture 2 images then combine them into one.
Call [CALayer drawInContext:viewContext] to get image of your background view.
Combine 2 images
+ (UIImage *) imageFromImage:(UIImage *)img1 andImage:(UIImage*) img2 {
UIGraphicsBeginImageContext(img1.size);
[img1 drawAtPoint:CGPointMake(0, 0)];
[img2 drawAtPoint:CGPointMake(0, 0)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
Related
Im developing an app where i have two images.user will touch some object on first image(for eg:nose).and then an object on the second image(eg:nose).
Now there will be button(merge button) and when user press that button i want to interchange the two touched images(ie two noses)of both images.
completely stuck at this point.
Can anyone please help me how to do this.
For detecting an image you can use Tap Gesture using which you can make your image draggable.
For merging an image You have to take all images you want to merge into a single UIView, for that checkout this snippet.
+ (UIImage *) imageWithView:(UIView *)view
{
UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage * img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
I have a UIImageView with is filled with image either taken by camera or picked from the liabray after I assign UIImage to UIImageView I want to rotate it with either clockwise or anticlock wise using 2 button respectively for both on every click image should rotate but without rotationg in superview UIImageView then after I want so save the image in the final position user saved that image...
If there is any method or procedure then please share as i m searching on this query from last many days but not got any acurate solution with proper details and working.
Rotation routine ( found this routine on another post but I forget where):
-(UIImage *)rotateImage:(UIImage *)image angleInRadians:(float)angleInRadians {
UIGraphicsBeginImageContext(image.size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextRotateCTM(ctx, angleInRadians);
CGContextDrawImage(ctx, (CGRect){{}, image.size}, image);
UIImage *imageOut = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return imageOut;
}
Angle in raadians could be M_PI/2 or -M_PI/2 to change landscape to portrait or viceversa
I load a image and create a mirror in this way:
originalImg = [UIImage imageNamed:#"ms06.png"];
mirrorImg = [UIImage imageWithCGImage:[originalImg CGImage] scale:1.0 orientation:UIImageOrientationUpMirrored];
Then I set the above UIImage object to a subclass of UIView, and override the drawRect:
- (void)drawRect:(CGRect)rect
{
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
CGAffineTransform t0 = CGContextGetCTM(context);
CGContextConcatCTM(context, t0);
CGContextDrawImage(context, self.bounds, [image CGImage]);
CGContextRestoreGState(context);
}
No matter which image I draw, the displayed image always be the original one, mirrored image was never displayed when set to the UIView subclass.
I'm sure that the mirrored image was set to the UIView correctly because the debug info showed that the orientation member variable equals to 4, which means "UIImageOrientationUpMirrored", while the original image equals to 0.
Does anyone could help me with this problem, thanks.
I also tried to display the mirrored image in UIImageView with setImage: and it works correctly. By the way I found that the breakpoint in drawRect was never hit when call the setImage of UIImageView, how can we define the drawing behavior(such as draw a line above the image) when loading image to the UIImageView?
You mirrow the image on UI-Level. This returns a new UIImage, but the CGImage stays the same. If you do some NSLogs, you will notice this.
You can also do transformations on UI-Level. If you use this approach, I would suggest to use originalImg.scale instead of 1.0. Then the code would work for retina and non-retina displays.
[UIImage imageWithCGImage:[originalImg CGImage] scale:originalImg.scale orientation:UIImageOrientationUpMirrored];
If you really need to mirror the CGImage, take a look at NYXImagesKit on GitHub (see UIImage+Rotating.m)
I have an imageview, the image within this imageview is for you to choose from the photoroll. I also have a button, when you click this button, there's an image added to a view with the addSubview code. This piece of image is draggable, resizeable and rotatable.
One problem, when I finish the image I use the method drawInRect. This draws all the layers onto eachother and creates an image. However the layers are on the wrong place and are the wrong size. It's also never rotated. I don't know how to fix this, the piece of code is beneath this text. Is it possible to keep the original image size and still have the layers drawn on the same place I drag them onto the imageview, if not how do I create a new size for this and have the result I want. And how do I draw the image rotated.
UIGraphicsBeginImageContext(imageView2.image.size);
// Draw image1
[imageView2.image drawInRect:CGRectMake(0, 0, imageView2.image.size.width, imageView2.image.size.height)];
// Draw image2
for(UIImageView *viewsSub in [self.imageViewer subviews])
{
[viewsSub.image drawInRect:CGRectMake(viewsSub.frame.origin.x, viewsSub.frame.origin.y, viewsSub.frame.size.width, viewsSub.frame.size.height)];
}
UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();
pld.imageChosen2 = resultingImage;
UIGraphicsEndImageContext();
So you want something like taking a "screenshot" of your actual imageview (with subviews included), don't you?
I used this piece of code to do something similar, but don't know if would work for you.
- (UIImage *)screenshot {
CGFloat scale = [UIScreen screenScale];
if(scale > 1.5) {
UIGraphicsBeginImageContextWithOptions(self.frame.size, NO, scale);
} else {
UIGraphicsBeginImageContext(self.frame.size);
}
[self.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return screenshot;
}
You should add this method inside your imageview (the one that contains all the subviews you're adding).
I'm trying to merge two UIImageViews. The first UIImageView (theimageView) is the background, and the second UIImageView (Birdie) is an image overlaying the first UIImageView. You can load the first UIImageView from a map or take a picture. After this you can drag, rotate and scale the second UIImageView over the first one. I want the output (saved image) to look the same as what I see on the screen.
I got that working, but I get borders and the quality and size are bad. I want the size to be the same as that of the image which is chosen, and the quality to be good. Also I get a crash if I save it a second time, right after the first time.
Here is my current code:
//save actual design in photo library
- (void)captureScreen {
UIImage *myImage = [self addImage:theImageView ToImage:Birdie];
[myImage retain];
UIImageWriteToSavedPhotosAlbum(myImage, self, #selector(imageSavedToPhotosAlbum:didFinishSavingWithError:contextInfo:), self);
}
- (UIImage*) addImage:(UIImage*)theimageView toImage:(UIImage*)Birdie{
CGSize size = CGSizeMake(theimageView.size.height, theimageView.size.width);
UIGraphicsBeginImageContext(size);
CGPoint pointImg1 = CGPointMake(0,0);
[theimageView drawAtPoint:pointImg1 ];
CGPoint pointImage2 = CGPointMake(0, 0);
[Birdie drawAtPoint:pointImage2 ];
UIImage* result = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return result;
}
But I only get errors with this code!
Thanks in advanced!
Take a look at Drawing a PNG Image Into a Graphics Context for Blending Mode Manipulation