I'm working on implementing a (very) simple screensaver using the Screensaver framework in OS X 10.10. Positioning on the center of the screen and displaying a two-line text works without problem, but setting the alignment to NSCenterTextAlignment somehow doesn't (the text is always displayed left-aligned).
- (void)animateOneFrame
{
// calculate font size based on screen
NSSize size = [self bounds].size;
CGFloat fontsize = size.height / 11;
// set text
NSMutableParagraphStyle *centredStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
[centredStyle setAlignment:NSCenterTextAlignment];
NSDictionary *textAttributes = [NSDictionary dictionaryWithObjectsAndKeys:
[NSFont fontWithName:#"Futura" size:fontsize], NSFontAttributeName,
[NSColor orangeColor], NSForegroundColorAttributeName,
centredStyle, NSParagraphStyleAttributeName,
nil];
NSString *theText = #"Simple text spanning\ntwo lines";
// position text on screen
NSRect boundingRect = [theText boundingRectWithSize:size options:0 attributes:textAttributes];
NSPoint point = NSMakePoint((size.width - boundingRect.size.width) / 2.0,
(size.height - boundingRect.size.height) / 2.0);
[theText drawAtPoint: point withAttributes: textAttributes];
}
Any pointers on how to solve this are appreciated.
PS: I know that I don't need to put everything into animateOneFrame but for the moment the goal is to get it working at all:-)
Related
I would like to display in an NSView a single-paged PDF.
So far, I have two solutions but they both have downsides. Can anyone help me with any of these downsides?
First solution: with NSImage and NSImageView
NSString *path= [[NSBundle mainBundle] pathForResource:name ofType:#"pdf"];
NSImage * image = [[NSImage alloc] initWithContentsOfFile:path] ;
NSImageView * imageView = [[NSImageView alloc] init] ;
imageView.frame = NSMakeRect(0, 0, 2*image.size.width, 2*image.size.height) ;
imageView.image = image ;
imageView.imageScaling = NSImageScaleAxesIndependently ;
return imageView
Downsides:
the image is not anti-aliased
I don't understand why the factor 2 is needed. Why does my PDF is displayed smaller in an NSView than it is with the Finder?
Second solution: with PDFDocument and PDFView
NSString *path= [[NSBundle mainBundle] pathForResource:name ofType:#"pdf"];
NSURL *urlPDF = [NSURL fileURLWithPath:path] ;
PDFDocument * myPDFDocument = [[PDFDocument alloc] initWithURL:urlPDF] ;
PDFView *myPDFView = [[PDFView alloc] init] ;
myPDFView.document = myPDFDocument ;
PDFPage * firstPage = [myPDFDocument pageAtIndex:0] ;
NSRect myBounds = [firstPage boundsForBox:kPDFDisplayBoxMediaBox] ;
NSRect myNewBounds = NSMakeRect(0, 0, myBounds.size.width*2, myBounds.size.height*2+5) ;
myPDFView.frame = myNewBounds ;
myPDFView.autoScales = YES ;
return myPDFView ;
Downsides:
I am able to select the text of my pdf, I can zoom in or zoom out. But I would like my PDF document to be displayed as an image, without these possibilities
I don't understand why the factor 2 is needed. Why is my PDF displayed smaller in an NSView than it is with the Finder?
There are some margins around my image
I'm not seeing the problems you describe with NSImageView. I implemented a nib-based window and NSImageView. In my case I have an overlapping sibling view, so I turned CALayers turned on in the nib. I'm on 10.9.2. Sizing is normal (1x) and the text in my PDF is anti-aliased (sub-pixel I think, since I see colors when I blow it up). I do have scaling NONE - maybe scaling is preventing anti-aliased text?
Otherwise my guess is there's something different about your views or or PDF content. Try a simpler PDF and/or a nib-based view and if it works, you can look for differences.
On a NSTextField I'm setting a custom font with a size of 140. The text is set to #"28". But as you can clearly see on the image, the text field has plenty of space on top. This only happens with certain type of fonts, not all of them. My question is what information from the font could be affecting the textfield that ends up cropping the text ? (Ascender, Cap Height ?). And if so, can I modify the font file to fix it ?
The baseline will vary between fonts. In addition, there are other metrics that vary. You can work around this problem with NSAttributedString. You could try varying the NSBaselineOffsetAttribute and from within a paragraph setMinimumLineHeight and setMaximumLineHeight. The following is an example. Make sure to create two textField labels and connect their outlets.
self.Label1.stringValue = #"Test Text";
//
// baseline is different for each font!
//
//self.Label2.stringValue = #"Test Text";
NSFont *otherFont = [NSFont fontWithName:#"MarkerFelt-Thin" size:40.0f];
NSNumber *baseline = [[NSNumber alloc] initWithFloat: 5.0f];
NSMutableParagraphStyle *paraStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
[paraStyle setParagraphSpacingBefore:20.0f];
[paraStyle setMinimumLineHeight:30.0f];
[paraStyle setMaximumLineHeight:50.0f];
NSDictionary *otherFDict = [NSDictionary dictionaryWithObjectsAndKeys: paraStyle, NSParagraphStyleAttributeName,
otherFont, NSFontAttributeName, baseline, NSBaselineOffsetAttributeName, nil];
NSMutableAttributedString *otherText = [[NSMutableAttributedString alloc] initWithString:#"Test Text" attributes:otherFDict];
self.Label2.attributedStringValue = otherText;
I'm trying to read the color value of a pixel in a tif image but I can't fihure out the correct way to do it. I'm using OSX and my approach is as follows:
NSImage *picture = [[NSImage alloc] initWithContentsOfFile:#"bais2.tif"]; //file is located in resoureces folder.
NSBitmapImageRep *imageRep = [[picture representations] objectAtIndex:0];
NSColor* color = [imageRep colorAtX:10 y:10];
NSLog(#"%f %f, %f", [color redComponent], [color blueComponent], [color greenComponent]);
The problem is that for some reason the logged values in NSLog always becomes 0.0000000....
I have also tried to use:
NSBitmapImageRep* imageRep = [[NSBitmapImageRep alloc] initWithData:[picture TIFFRepresentation]];
instead of [[picture representations] objectAtIndex:0] but the result is the same.
I get no error messages or warnings, but I think there is something wrong when i load the picture?
Please help me, what am i doing wrong? And is there a better way to read pixel color data?
Your error is here:
NSImage *picture = [[NSImage alloc] initWithContentsOfFile:#"bais2.tif"];
-------------------------------------------------------------------^^^^
You can use:
NSImage *picture= [NSImage imageNamed:#"bais2.tiff"];
Or :
NSImage *picture = [[NSImage alloc] initWithContentsOfFile:#"bais2.tiff"];
NSData *someNSData = [Image TIFFRepresentation];
NSBitmapImageRep *someNSBitmapImageRepData = [[NSBitmapImageRep alloc] initWithData:someNSData];
NSSize imageSizee = [someNSBitmapImageRepData size];
CGFloat y = imageSize.height - 100.0;
NSColor* color = [someNSBitmapImageRepData colorAtX:100.0 y:y];
NSLog(#"color = %#",color);
output : color = NSCalibratedRGBColorSpace 1 1 1 1
this is my drawLayer method in a CALayer's delegate.
it's only responsible for drawing a string with length = 1.
- (void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx
{
CGRect boundingBox = CGContextGetClipBoundingBox(ctx);
NSAttributedString *string = [[NSAttributedString alloc] initWithString:self.letter attributes:[self attrs]];
CGContextSaveGState(ctx);
CGContextSetShadowWithColor(ctx, CGSizeZero, 3.0, CGColorCreateGenericRGB(1.0, 1.0, 0.922, 1.0));
CTLineRef line = CTLineCreateWithAttributedString((CFAttributedStringRef)string);
CGRect rect = CTLineGetImageBounds(line, ctx);
CGFloat xOffset = CGRectGetMidX(rect);
CGFloat yOffset = CGRectGetMidY(rect);
CGPoint pos = CGPointMake(CGRectGetMidX(boundingBox) - xOffset, CGRectGetMidY(boundingBox)- yOffset);
CGContextSetTextPosition(ctx, pos.x, pos.y);
CTLineDraw(line, ctx);
CGContextRestoreGState(ctx);
}
here's the attributes dictionary:
NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:
[NSFont fontWithName:#"GillSans-Bold" size:72.0], NSFontAttributeName,
[NSColor blackColor], NSForegroundColorAttributeName,
[NSNumber numberWithFloat:1.0], NSStrokeWidthAttributeName,
[NSColor blackColor], NSStrokeColorAttributeName,
style, NSParagraphStyleAttributeName, nil];
as is, the stroke does not draw, but the fill does.
if i comment out the stroke attributes in the dictionary, the fill draws.
i know this can't be right, but i can't find any reference to this problem.
is this a known issue when drawing text with a delegate ?
as the string is one character, i was following the doc example not using any framesetter machinery, but tried that anyway as a fix attempt without success.
in reading this question's answer, i realized that i needed to be using a negative number for the stroke value. i was thinking of the stroke being applied to the outside of the letter drawn by CTLineDraw, rather then inside the text shape.
i'm answering my own question, in case this should help anyone else with this misunderstanding, as i didn't see the referenced doc covering this.
I'm developing a program in which I am programmatically adding an NSImageView to a custom NSView class. While creating the image-view, I am passing the frame of the parent container.
-(NSImageView *)loadNSImage:(NSString *)imageName frame:(NSRect)frame{
imageName = [[NSBundle mainBundle] pathForResource:imageName ofType:#"png"];
NSImage *image = [[NSImage alloc] initWithContentsOfFile:imageName];
NSImageView *imageView = [[NSImageView alloc]initWithFrame:frame];
[imageView setImage:image];
[imageView setImageScaling:NSImageScaleProportionallyUpOrDown];
[imageView setAutoresizingMask:NSViewHeightSizable | NSViewWidthSizable | NSViewMaxXMargin | NSViewMaxYMargin | NSViewMinXMargin | NSViewMinYMargin];
[imageView setImageAlignment:NSImageAlignCenter];
[image release];
return imageView;
}
Then I am using the addSubView method to add this into the Custom View. The problem is that the image sticks to the bottom-left of the parent view. How can I place this image in the center of the parent view?
I have tried adding an offset to the frame origin, but that doesn't really work when the window is resized, or if an image with a different size is loaded.
Any help would be appreciated.
I'm not sure if this is the best way to do it, but I just do simple math when I want to center a subview inside its parent.
You need to set all the margins to be auto-resizable if you want it to stay centered.
[subview setFrameOrigin:NSMakePoint(
round((NSWidth([parentView bounds]) - NSWidth([subview frame])) / 2),
round((NSHeight([parentView bounds]) - NSHeight([subview frame])) / 2)
)];
[subview setAutoresizingMask:NSViewMinXMargin | NSViewMaxXMargin | NSViewMinYMargin | NSViewMaxYMargin];
This is just calculating the margins required to get a centered origin.
If you need the centered frame before you invoke initWithFrame: then just use the above logic to compute the frame origin values.
Swift 5 #d11wtq's answer
let x = (parentView.bounds.width - subviewWidth) * 0.5
let y = (parentView.bounds.height - subviewHeight) * 0.5
let f = CGRect(x: x, y: y, width: subviewWidth, height: subviewHeight)
let subview = NSView(frame: f)
subview.autoresizingMask = [.minXMargin, .maxXMargin, .minYMargin, .maxYMargin ]
Objective - C in macOS Catalina , Version 10.15.3
more readable #d11wtq's answer
CGFloat x = (NSWidth(parentView.bounds) - subviewWidth) * 0.5;
CGFloat y = (NSHeight(parentView.bounds) - subviewHeight) * 0.5;
CGRect f = CGRectMake(x, y, subviewWidth, subviewHeight);
subview = [[NSView alloc] initWithFrame: f];
subview.autoresizingMask = NSViewMinXMargin | NSViewMaxXMargin | NSViewMinYMargin | NSViewMaxYMargin;
Try This.
in .h
#property (strong, nonatomic) IBOutlet UIView *CoinsPurchaseView;
in .m
self.CoinsPurchaseView.center = self.view.center;
[self.view addSubview:self.CoinsPurchaseView];