nicolas-miari

- (nullable UIImage *)sampleImage {
  CGRect bounds = CGRectMake(0, 0, 50, 50);
  UIColor *color = [UIColor colorWithDisplayP3Red:1 green:0.5 blue:0.25 alpha:1];
  UIGraphicsBeginImageContextWithOptions(bounds.size, NO, 0);
  [color setFill];
  UIRectFill(bounds);
  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  return image;
}

nicolas-miari

import Foundation
import CoreImage

/**
 Based on: https://gist.github.com/SheffieldKevin/566dc048dd6f36716bcd
 Updated for Swift 5.5 (Xcode 13)
 */
class ImageDiff {

  func compare(leftImage: CGImage, rightImage: CGImage) throws -> Int {

nicolas-miari

/// Make the ViewController conform to this protocol 
///
protocol SceneKitViewController {
    var sceneKitView: SceneKitView! { get }
}

/// Make the ViewController conform to this protocol too
///
protocol SpriteSceneNavigationDelegate {
    func present(_ scene: BaseSpriteScene)

nicolas-miari

import UIKit
import MobileCoreServices // needed for kUTTypeGIF

extension Array where Element == UIImage {

    /**
     Writes a looping animated gif to the documents folder, using the receiver's elements as the frames.

    Based on [this answer](https://stackoverflow.com/a/46095888/433373) from Stack Overflow.
    

nicolas-miari

import UIKit

extension UIBezierPath {

    /**
     Draws the super-elliptic analog of a rounded rect. Unlike the regular rounded rect, the rounded corners
     are the quadrants of a superellipse (i.e., parabolic segments), _not_ circular arcs.
     If `rect` is a square and `cornerRadius` is equal to half the length or more, and actual superellipse is
     drawn (no straight sections along its boundary) just like doing the same with a rounded rect results in a
     circle being drawn.

nicolas-miari

import CoreGraphics

extension CGFloat {

    /// See this: https://tauday.com/tau-manifesto 
    static var tau: CGFloat {
        return 2 * CGFloat.pi
    }
}

nicolas-miari

/**
 Provides convenient shorthands for initializing `NSError` objects.
 */
extension NSError {
    /**
     Same as `init(domain:code:userInfo:)`, but `domain` defaults to the app's
     bundle indentifier.
     */
    convenience init(code: Int, userInfo: [NSObject : AnyObject]?) {
        let bundleIdentifier = NSBundle.mainBundle().bundleIdentifier!

nicolas-miari

extension UIImage {
     /**
     Calculates the resulting size (rendered on screen) of the receiver when it
     is displayed within a `UIImageView` instance of bounds size `containerSize`
     that has its `contentMode` property set to `.ScaleAspectFit`.
     
     - parameter contanerSize: The size of the hypothetical UIImageView instance
     that is to display the receiver on screen.
     - returns: the effective size at which the receiver would be rendered on 
     screen if displayed in said view.

nicolas-miari

import UIKit

extension UIColor {
    convenience init(
        redByte red: UInt8,
        greenByte green: UInt8,
        blueByte blue: UInt8,
        alphaByte alpha: UInt8
        ) {
        self.init(

nicolas-miari

- (CGFloat) imageScaleFactorFromFilename:(NSString*) imageFileName
{
    NSString* filename = [imageFileName stringByDeletingPathExtension];
    
    NSArray* components = [filename componentsSeparatedByString:@"@"];
    
    if ([components count] > 1) {
        // Hi res image
        
        NSString* scaleSubstring = [components objectAtIndex:1];    // e.g. @"2x"