jverkoey

Notice

This is an undocumented API. It may break at any time. Contributions welcome; please share in the comments and I will update the gist accordingly.

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jverkoey

// NOTE: I've decided to use a much simpler approach to this as the complexity was starting to consume
// too much energy. Leaving this here for historical context.

// Building an Underdamped Harmonic Oscillator
//
// All equations derived from this wonderful paper by David Morin:
// http://www.people.fas.harvard.edu/~djmorin/waves/oscillations.pdf
//
// Note on mass: In order to simplify our calculations I'll assume that mass (m) is always 1. Where
//               m would otherwise be written I've folded it into the expression.

jverkoey

@interface NSObject ()
- (void)generateSpringPropertiesForDuration:(float)arg1 damping:(float)arg2 velocity:(float)arg3;
- (id)_defaultAnimationForKey:(id)arg1;
@end

// This object calculates the damping and stiffness coefficients, given a damping value (0...1], a velocity, and a duration.
id obj = [[NSClassFromString(@"UIViewSpringAnimationState") alloc] init];

[obj generateSpringPropertiesForDuration:10 damping:0.5 velocity:10];

jverkoey

public func rubberBand(value: CGFloat, min: CGFloat, max: CGFloat, bandLength: CGFloat) -> CGFloat {
  if value >= min && value <= max {
    // While we're within range we don't rubber band the value.
    return value
  }

  if bandLength <= 0 {
    // The rubber band doesn't exist, return the minimum value so that we stay put.
    return min

jverkoey

static const CGFloat kFontWeightEpsilon = FLT_EPSILON;

@implementation UIFont (CustomizedDynamicType)

+ (nonnull UIFont *)preferredFontWithDefaultSize:(CGFloat)size
                                       textStyle:(nonnull UIFontTextStyle)textStyle {
  return [self preferredFontWithDefaultSize:size
                                  textStyle:textStyle
                                 fontWeight:UIFontWeightRegular
                                     italic:NO];

jverkoey

// Blogged at http://design.featherless.software/enumerate-midipacketlist-in-swift-part-1/
//        and http://design.featherless.software/enumerate-midipacketlist-in-swift-part-2/
extension MIDIPacketList: SequenceType {
  public func generate() -> AnyGenerator<MIDIPacket> {
    var iterator: MIDIPacket?
    var nextIndex: UInt32 = 0

    return anyGenerator {
      if nextIndex++ >= self.numPackets { return nil }
      if iterator != nil {

jverkoey

- (CGSize)sizeOfContentsWithSize:(CGSize)size
                    shouldLayout:(BOOL)shouldLayout {
  // Calculate frames.

  if (shouldLayout) {
    // Update frames.
  }

  return // size
}

jverkoey

## One-time setup

# Deletes references to remote branches during git fetch
git config --global fetch.prune true

## .bashrc

# Pushes the local branch to origin and makes the local branch track the remote
gpush() {
  git push origin $(git rev-parse --abbrev-ref HEAD) -u

jverkoey

import Foundation

extension Data {
  /**
   Returns the result of xor'ing self with the given Data.
   */
  public func xored(with rhs: Data) -> Data {
    return Data(zip(self, rhs).map { $0 ^ $1 })
  }
}

jverkoey

/** The returned generator will enumerate each value of the provided tuple. */
func generatorForTuple(tuple: Any) -> AnyGenerator<Any> {  
  return anyGenerator(Mirror(reflecting: tuple).children.lazy.map { $0.value }.generate())
}

// Blogged at http://design.featherless.software/enumerating-tuple-values-swift/