Questions tagged [cgcontextref]
90 questions
18
votes
2 answers
Do you need to release CGContextRef in Swift?
I've created a context using CGBitmapContextCreate. Do I need to release it using CGContextRelease? I know the answer is yes in Objective-C, but how about in Swift?
Thanks!
user2732722
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7
votes
4 answers
Stretched UIView background gets cut off during screenshot
So, I am taking a screenshot of a subclassed UIView that I save into the device's photo stream.
Problem:
The problem is that I use resizableImageWithCapInsets to add a stretched background to my UIView, but this background gets cut off on the right…
Gergely Kovacs
- 1,045
- 2
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- 28
6
votes
1 answer
How to zoom graph, created with CGContextRef
I am drawing a line graph by using CGContextRef. Can I zoom in zoom out this graph to show lines clearly.
I am using this code.
CGContextRef context=UIGraphicsGetCurrentContext();
CGContextBeginPath(context);
CGMutablePathRef…
Mayank Jain
- 5,663
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- 65
6
votes
2 answers
Can I draw shapes like circle,rectangle,line etc outside drawRect method
Can I draw shapes like circle, rectangle, line etc outside drawRect method using
CGContextRef contextRef = UIGraphicsGetCurrentContext();
or is it mandatory to use it inside drawRect only.
Please help me, let me know how can I draw shapes outside…
Prashant Nikam
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6
votes
2 answers
How can store all points in the CGContextAddArc (CGContextRef) to NSMUtableArray
How can i strore all pixel point in the CGContextAddArc To NSMutableArray.or CGContextRef to NSMutable Array
static inline float radians(double degrees)
{
return degrees * PI / 180;
}
- (void)drawRect:(CGRect)rect
{
CGContextRef context =…
Musthafa
- 862
- 3
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- 27
5
votes
3 answers
Crash whille Converting NSURL to CFURL
I want to create pdf in document directory and want to give page numbers so I need CGPDFDocumentRef object.
let fileName: NSString = "test.pdf"
let path:NSArray = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
let…
Anil Kukadeja
- 1,348
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5
votes
3 answers
How to create embossed or shadow effects using Core Graphics (for finger paint)
I have issue to implement "Emboss/Shadow effects" in my drawing. Finger paint functionality is currently working fine with my custom UIView and below is my drawRect method code:
Edit code with all methods :
- (void)drawRect:(CGRect)rect
{
…
Hitarth
- 1,950
- 3
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- 52
3
votes
2 answers
UIColor and Graphics Context
I have a custom UIView which draws a path like so
- (void)drawRect:(CGRect)rect{
[[UIColor blackColor] setStroke];
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSetFillColor(ctx, CGColorGetComponents(self.color));
…
tmpz
- 368
- 3
- 12
3
votes
1 answer
How to clear circle in CGContext in iOS
I want create image using CGcontext. This is simple image with white or black background. also I want to add transperent part which is in circle ( check attached image). I know how to do this in rect. But i want to make it circle. Please anyone help…
technerd
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3
votes
4 answers
Use CGContextClip to clip a circle with image
Have a imageViewA (frame{0,0,320,200}) in my app, and I want to clip a circle with the imageViewA's center, radius=50, and draw into another imageViewB (frame{0,0,100,100});
the original image effect like this :
and use below code to…
Roby
- 179
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- 14
3
votes
2 answers
How to move the image on the CGContextRef
An image has been drawn on the CGContextRef:
CGContextDrawImage(context, CGRectMake(0, 0, width, height), image);
In another function, I want to move the image to the rect like
CGRectMake(100, 100, width, height);
How can I do?
void…
KChen
- 1,922
- 14
- 15
3
votes
1 answer
Replace specific color in CGBitmapContext
How can I replace specific color(RGB value) in CGBitmapContext that has already drawn?
Is there any easy way?
Thanks in advance.
Jun
- 3,422
- 3
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2
votes
2 answers
Masking an image using CGLayerRef and CGContextDrawLayerInRect
I want to mask an image by another image using CGLayerRef in off-screen rendering since it's suitable for high-quality rendering as it's mentioned in documentation
Core Graphics Layer Drawing :
CGLayer objects allow your application to use…
Reza.Ab
- 1,195
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2
votes
1 answer
CGContext AND CGContextRef the same in Swift? How does this work?
I was porting some ObjectiveC custom UIView subclasses to Swift this morning. Wanting to make it more "object oriented", I was following the example of extending CGContext with methods. E.g.
extension CGContext {
func fillColor(color:UIColor)…
Travis Griggs
- 21,522
- 19
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2
votes
1 answer
cropping an area CGRect from UIGraphicsImageContext
I have a CGPath shaped like an arrow that I am drawing in the CGContext of my current view. I would like to generate a miniature version (thumbnail) of the arrow to add it as an Image to a UITableView showing all selected arrows.
I am succeeding to…
user1612877
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