Çekirdek Grafik/Kuvars 2D'de yuvarlatılmış dikdörtgen nasıl çizilir?

Question

Yuvarlatılmış bir dikdörtgen için anahat çizmem gerekiyor. Hatları ve yayları yapabileceğimi biliyorum, ama belki de yuvarlak rektler için bir işlev var mı? Buna öncedenpaketlenmiş yolu

Answer 1

yoktur, buradan buraya Bunu yapmak için kod gösteren bir referans Quartz Demo ve quartzdemo proje Bunu yapabilmek için, elma içinde yaylar birleştirmek gerekir kod onlar

// As a bonus, we'll combine arcs to create a round rectangle! 

// Drawing with a white stroke color 
CGContextRef context=UIGraphicsGetCurrentContext() 
CGContextSetRGBStrokeColor(context, 1.0, 1.0, 1.0, 1.0); 

// If you were making this as a routine, you would probably accept a rectangle 
// that defines its bounds, and a radius reflecting the "rounded-ness" of the rectangle. 
CGRect rrect = CGRectMake(210.0, 90.0, 60.0, 60.0); 
CGFloat radius = 10.0; 
// NOTE: At this point you may want to verify that your radius is no more than half 
// the width and height of your rectangle, as this technique degenerates for those cases. 

// In order to draw a rounded rectangle, we will take advantage of the fact that 
// CGContextAddArcToPoint will draw straight lines past the start and end of the arc 
// in order to create the path from the current position and the destination position. 

// In order to create the 4 arcs correctly, we need to know the min, mid and max positions 
// on the x and y lengths of the given rectangle. 
CGFloat minx = CGRectGetMinX(rrect), midx = CGRectGetMidX(rrect), maxx = CGRectGetMaxX(rrect); 
CGFloat miny = CGRectGetMinY(rrect), midy = CGRectGetMidY(rrect), maxy = CGRectGetMaxY(rrect); 

// Next, we will go around the rectangle in the order given by the figure below. 
//  minx midx maxx 
// miny 2  3  4 
// midy 1 9    5 
// maxy 8  7  6 
// Which gives us a coincident start and end point, which is incidental to this technique, but still doesn't 
// form a closed path, so we still need to close the path to connect the ends correctly. 
// Thus we start by moving to point 1, then adding arcs through each pair of points that follows. 
// You could use a similar tecgnique to create any shape with rounded corners. 

// Start at 1 
CGContextMoveToPoint(context, minx, midy); 
// Add an arc through 2 to 3 
CGContextAddArcToPoint(context, minx, miny, midx, miny, radius); 
// Add an arc through 4 to 5 
CGContextAddArcToPoint(context, maxx, miny, maxx, midy, radius); 
// Add an arc through 6 to 7 
CGContextAddArcToPoint(context, maxx, maxy, midx, maxy, radius); 
// Add an arc through 8 to 9 
CGContextAddArcToPoint(context, minx, maxy, minx, midy, radius); 
// Close the path 
CGContextClosePath(context); 
// Fill & stroke the path 
CGContextDrawPath(context, kCGPathFillStroke); 

Answer 2

sağlamak olduğunu

İsterseniz, herhangi bir UIView (veya alt sınıf) üzerinde yuvarlatılmış köşelere sahip olmanın kolay yolu, cornerRadius özelliğini görünüm katmanında ayarlamaktır. Eğer

[UIBezierPath bezierPathWithRoundedRect:cornerRadius:] 

veya

[UIBezierPath bezierPathWithRoundedRect:byRoundingCorners:cornerRadii:] 

kullanabilirsiniz yerine çizgi ve yay üzerinden kendi yolunu yapma Preview rounded image in iphone

Answer 3

Bkz

(ikinci bir sen köşeleri yuvarlatılmış belirtmek sağlar)

iOS 3.2 veya daha üstü sürümü mevcuttur.

Answer 4

Burada yazdığım bir işlev, giriş köşesini bir köşe yarıçapı kullanarak yuvarlar.

CGMutablePathRef createRoundedCornerPath(CGRect rect, CGFloat cornerRadius) { 

    // create a mutable path 
    CGMutablePathRef path = CGPathCreateMutable(); 

    // get the 4 corners of the rect 
    CGPoint topLeft = CGPointMake(rect.origin.x, rect.origin.y); 
    CGPoint topRight = CGPointMake(rect.origin.x + rect.size.width, rect.origin.y); 
    CGPoint bottomRight = CGPointMake(rect.origin.x + rect.size.width, rect.origin.y + rect.size.height); 
    CGPoint bottomLeft = CGPointMake(rect.origin.x, rect.origin.y + rect.size.height); 

    // move to top left 
    CGPathMoveToPoint(path, NULL, topLeft.x + cornerRadius, topLeft.y); 

    // add top line 
    CGPathAddLineToPoint(path, NULL, topRight.x - cornerRadius, topRight.y); 

    // add top right curve 
    CGPathAddQuadCurveToPoint(path, NULL, topRight.x, topRight.y, topRight.x, topRight.y + cornerRadius); 

    // add right line 
    CGPathAddLineToPoint(path, NULL, bottomRight.x, bottomRight.y - cornerRadius); 

    // add bottom right curve 
    CGPathAddQuadCurveToPoint(path, NULL, bottomRight.x, bottomRight.y, bottomRight.x - cornerRadius, bottomRight.y); 

    // add bottom line 
    CGPathAddLineToPoint(path, NULL, bottomLeft.x + cornerRadius, bottomLeft.y); 

    // add bottom left curve 
    CGPathAddQuadCurveToPoint(path, NULL, bottomLeft.x, bottomLeft.y, bottomLeft.x, bottomLeft.y - cornerRadius); 

    // add left line 
    CGPathAddLineToPoint(path, NULL, topLeft.x, topLeft.y + cornerRadius); 

    // add top left curve 
    CGPathAddQuadCurveToPoint(path, NULL, topLeft.x, topLeft.y, topLeft.x + cornerRadius, topLeft.y); 

    // return the path 
    return path; 
} 

nasıl UIView alt sınıf varsayarak işlevini kullanın ve geçersiz kılmak için drawRect:

- (void)drawRect:(CGRect)rect { 

    // constants 
    const CGFloat outlineStrokeWidth = 20.0f; 
    const CGFloat outlineCornerRadius = 15.0f; 

    const CGColorRef whiteColor = [[UIColor whiteColor] CGColor]; 
    const CGColorRef redColor = [[UIColor redColor] CGColor]; 

    // get the context 
    CGContextRef context = UIGraphicsGetCurrentContext(); 

    // set the background color to white 
    CGContextSetFillColorWithColor(context, whiteColor); 
    CGContextFillRect(context, rect); 

    // inset the rect because half of the stroke applied to this path will be on the outside 
    CGRect insetRect = CGRectInset(rect, outlineStrokeWidth/2.0f, outlineStrokeWidth/2.0f); 

    // get our rounded rect as a path 
    CGMutablePathRef path = createRoundedCornerPath(insetRect, outlineCornerRadius); 

    // add the path to the context 
    CGContextAddPath(context, path); 

    // set the stroke params 
    CGContextSetStrokeColorWithColor(context, redColor); 
    CGContextSetLineWidth(context, outlineStrokeWidth); 

    // draw the path 
    CGContextDrawPath(context, kCGPathStroke); 

    // release the path 
    CGPathRelease(path); 
} 

Örnek çıkışı:

Answer 5

UIBezierPath *bezierPath = [UIBezierPath bezierPathWithRoundedRect:bubbleBounds cornerRadius:15.0]; 
CGContextSetStrokeColorWithColor(context, [UIColor grayColor].CGColor); 
[bezierPath stroke]; 

Answer 6

CGPathCreateWithRoundedRect() istediğini yapacağız. Mevcut

CGPathRef CGPathCreateWithRoundedRect(
    CGRect rect, 
    CGFloat cornerWidth, 
    CGFloat cornerHeight, 
    const CGAffineTransform *transform 
); 

Answer 7

Belki

... Üç iOS 7.0 ve daha? yıllar geç ama bu günlerde bunları sorunsuz kullanıyorum.

@import CoreGraphics; 

@interface YourViewController() 
@property (weak, nonatomic) IBOutlet UIButton *theButton; 
@end 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    self.theButton.layer.cornerRadius = 5.0f; 
    self.theButton.layer.masksToBounds = YES; 

    // Another useful ones 
    // Scaling the view (width, height) 
    self.theButton.transform = CGAfflineTransformMakeScale(1.50f, 1.50f); 

    // Setting an alpha value (transparency) - nice with Activity Indicator subviews 
    self.theButton.alpha  = 0.8f; 
} 

Answer 8

Swift: herkes, nasıl `CGContextAddArcToPoint()` eserler [bu] (http

let rect: CGRect = ... 

    let path = UIBezierPath(roundedRect: rect, cornerRadius: 5.0) 
    CGContextAddPath(context, path.CGPath) 
    CGContextSetStrokeColorWithColor(context, UIColor.clearColor().CGColor) 
    CGContextDrawPath(context, CGPathDrawingMode.FillStroke)