For an arduino drawing robot i want to rotate an image by 45 degrees in an iOS app, so that the new (rotated image) is inside a white box. Imagine the blue rectangle in the picture was the original image, and the image. As you can see it is rotated an inside a white square. How could I do this? It is important not only to have a rotated image, or a rotated image which has a white box behind it on the screen. It actually has to be a new image, so that if i get the color of pixel (1,1) it is white.
You can try to do this with having a white UIView superview, and blue UIView subview. And then do:
subview.transform = CGAffineTransformMakeRotation(M_PI/4);
superview.bound = subview.frame;
I think it should work.
Related
Problem : I have an image with zoom and pan attached. I need to draw rectangles over it.
What I have done : I created a Canvas as an overlay over the image and made rectangle the children of canvas. Everything works well with zoom and pan etc but if the user resizes my the window then the added rectangles starts moving from their places because the rectangle position is set with respect to top and left of canvas.
I am thinking of drawing rectangles over the image and overriding the render. Any suggestions how can I achieve it easily?
I'm trying to make an NSTextField with only two rounded corners on the top-left and bottom-left. I tried to do the following, but in this case I get all corners rounded:
[self.myTextField:YES];
self.myTextField.layer.cornerRadius = 5;
What should I do to have only two (or for example one) rounded corners?
I'm a little out of my lane in OS X, but what you want to do is embed whatever corner art you like into an image and present those on an image view behind the NSTextField.
Resize the image view exactly as you do the text field, but first set the image's capInsets property. Size the insets to exclude the corners from scaling as the extent of the image changes. (Make sure your corner art is placed at the extreme edges of the image).
How can I increase brightness in specific area of a UIImageView,
For ex:I have an imageview with image.I want to increase the brightness of image in specific elliptical area of that image.
I know how to increase the brightness of whole image , But dont know for specific elliptical area.
You can add a black UIView with a specific alpha apply on it (this will control how dark you want your view) and attach a mask layer to this view that has an ellipse. For the part of your view that is masked it will be brighter.
You need to import the Quartzcore framework when you are working with layer/mask. The mask is a property of your view layer ([yourView layer].mask).
Using Interface Builder I have a UIView with a number of UIButtons as subviews. In IB all of the button types are set to Rounded Rect and each button uses an image from the image drop down box. The images are square and the size of the rounded rect UIButton is the same as image. The images are png's and they are from b&w photo's.
The issue is the UIButton rounded corners are gone and everything is square in IB and when running under the simulator.(no hardware yet) I was hoping the button drawRect would crop the image and preserve the rounded rect look. Is there a way to do this? in IB?
Appreciate the help.
Make sure that Clip Subviews are checked in IB. It's in the Attributes Inspector under the View section.
i have an image sized 768X1024 and when i set the background image to a view, at the bottom it displays the white color (20pixel).Eventhough I incereses the image size 768X1044 it repeats the same.Please help me.
Make sure that the position is set to CGPointMake(0,0), with
[theImage setPosition:CGPointMake(0,0)];
It's probably just positioned up by 20 pixels.