Questions tagged [graphicscontext]
64 questions
79
votes
6 answers
iOS: what's the fastest, most performant way to make a screenshot programmatically?
in my iPad app, I'd like to make a screenshot of a UIView taking a big part of the screen. Unfortunately, the subviews are pretty deeply nested, so it takes to long to make the screenshot and animate a page curling afterwards.
Is there a faster way…
swalkner
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18
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3 answers
iOS " current graphics context" - What is that
When I draw lines and shapes etc I get the " current graphics context" in iOS.
What exactly though is " current graphics context" - I'm looking for the 30,000 foot description.
Right now I just copy and paste UI code, not exactly sure what it's…
Ian Vink
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15
votes
1 answer
Creating a UIImage from a rotated UIImageView
I have a UIImageView with an image in it. I have rotated the image prior to display by setting the transform property of the UIImageView to CGAffineTransformMakeRotation(angle) where angle is the angle in radians.
I want to be able to create…
Magic Bullet Dave
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8
votes
1 answer
JavaFX GraphicsContext change text size
I would like to be able to change the font size and possibly the font itself before the strokeText() method is called. I can change the color but I don't see anyway to change the font.
Pane canvas = new Pane();
GraphicsContext gc =…
user1958884
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6
votes
2 answers
Why isn't text anti-aliasing working, while using a SWT GC to draw text?
Right now my goal is to have anti-aliased text on my Labels. If my research was correct, SWT Labels do not natively support anti-aliasing on text, so my current workaround attempt is to create an image, turn text anti-aliasing on, draw my text to…
Dylan
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4
votes
2 answers
JavaFX: How can a Path be painted on a GraphicsContext?
JavaFX provides both low-level path painting methods on a GraphicsContext and a high-level Path node.
I want to store shapes in classes and draw them in a GraphicsContext. The Path class seems convenient for me. I know, it is meant to be used as a…
Andi
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3
votes
2 answers
JavaFX GraphicsContext Inverted Circle
I've been trying to find a way to do this online, but I haven't been able to find anything.
I want to draw an "inverse circle" with the JavaFX GraphicsContext.
These images show what I want.
Original:
With "Inverted Circle" (What I want to…
MCMastery
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3
votes
2 answers
Override path with transparent color in javafx Canvas/GraphicsContext
I'm wondering if there is any way in the GraphicsContext of a Canvas in JavaFX to override all pixels in a path in such a way that they become transparent again. Like the clearRect function but for any path.
I have looked at the different BlendModes…
illfang
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3
votes
1 answer
Don't clear the context before drawing
I'm trying to find a way to draw lines on a view without redrawing all the context.
Here is my drawing methods :
-(void)drawInContext:(CGContextRef)context {
for (int i = 0; i < self.drawings.count; ++i) {
Drawing* drawing =…
Seb
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3
votes
1 answer
On iOS, Is there a way to get the size of an ImageContext after creating it using UIGraphicsBeginImageContextWithOptions?
If an image context is created using:
UIGraphicsBeginImageContextWithOptions(CGSizeMake(768, 768), YES, 1.0);
is there a way to get the size of the context later on? The size for sure is there when the image is obtained from the context, but while…
Jeremy L
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3
votes
1 answer
How do I capture UIImage of complete contents of UITableView / UIScrollView and make it work on an ios device
I am using this wonderfully elegant piece of code Getting a screenshot of a UIScrollView, including offscreen parts to capture the entire contents of a UITableView to be exported to a…
Ben Priebe
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3
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1 answer
On iOS, after we create a layer from context and get the layer's context, how do these contexts relate to each other?
We can create a layer from the current graphics context and then get the layer's context:
CGContextRef context = UIGraphicsGetCurrentContext();
CGLayerRef layer = CGLayerCreateWithContext(context,
…
nonopolarity
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2
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1 answer
How to clear an inclined rectangle in JavaFX Canvas efficiently?
Currently I have the following problem:
I would like to draw a straight angled line in JavaFX Canvas like so (Recalling from memory so method names might not be accurate):
Canvas canvas = new Canvas(500, 600);
GraphicsContext gc =…
nick16384
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2
votes
1 answer
JavaFx canvas filltext rendering quality
I am working on a JavaFx application which use canvas to represent a diagram. The canvas is painting text using graphicsContext.fillText(). In the image below the canvas is on the right, on the left is a Label using the same font. My question is…
DbSchema
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2
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1 answer
Internal graphics not initialized yet in JUunit test case
I'm making a light weight painting application with JavaFx.
I've been having some issues with my LayerController class and it's methods addLayer etc. So I thought that writing some JUunit test cases would be a good idea to check the correctness of…
Skarsh
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