berikv’s gists

berikv / gifify

Last active December 21, 2021 16:51

Transform a movie file to a gif. Specialised for demo's of Mobile app screen recordings.

	#!/bin/bash

	FFMPEG=$(command -v ffmpeg)
	INFILE=$1
	OUTFILE="${INFILE}.gif"
	TMPFILE="${INFILE}_gifify_palette.png"

	if ! $FFMPEG -L > /dev/null 2>&1; then
	echo "Run: brew install ffmpeg"
	exit 1

berikv / UIColor+hex.swift

Created May 21, 2015 12:42

	//
	// UIColor+hex.swift
	//
	// Created by Berik Visschers on 05-21.
	// Copyright (c) 2015 Berik Visschers. All rights reserved.
	//

	import UIKit

	extension UIColor {

berikv / gist:f17b6e18a8de011ec71f

Created March 27, 2015 19:46

Is user a simulator


	let simulator = UIDevice.currentDevice().model.rangeOfString("Simulator") != nil

berikv / ExponentialMovingAverage.swift

Last active December 30, 2022 18:25

Exponential Moving Average

	func exponentialMovingAverage(currentAverage: Double, newValue: Double, smoothing: Double) -> Double {
	return smoothing * newValue + (1 - smoothing) * currentAverage
	}

	// Usage:
	// var a = 3
	// a = exponentialMovingAverage(a, 8, 0.5)


	// Swift 2

berikv / dispatch_after_swift.codesnippet

Last active August 29, 2015 14:17

Xcode snippet for dispatch_after in Swift. Move this file to ~/Library/Developer/Xcode/UserData/CodeSnippets. Use Finder CMD+Shift+G

	<?xml version="1.0" encoding="UTF-8"?>
	<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
	<plist version="1.0">
	<dict>
	<key>IDECodeSnippetCompletionPrefix</key>
	<string>dispatch_after</string>
	<key>IDECodeSnippetCompletionScopes</key>
	<array>
	<string>CodeExpression</string>
	</array>

berikv / example.txt

Created February 20, 2015 10:55

LLDB helper for printing the position of a view inside it's window

	(lldb) posinwindow 0x796a0e60
	(CGPoint) $58 = (x=711, y=205.5)

berikv / log.swift

Last active August 29, 2015 14:13

Simple logging in swift

	func log<T>(message: T, fileName: String = __FILE__, lineNumber: Int = __LINE__, args: CVarArgType...) {
	let date = NSDate()
	let processInfo = NSProcessInfo()
	let appName = processInfo.processName
	let combined = String(format: String(stringInterpolationSegment: message), arguments: args)

	println("\(date) \(appName) [\(fileName.lastPathComponent):\(lineNumber)] \(combined)")
	}

berikv / networkActivityIndicator

Last active August 29, 2015 14:09

Multiple concurrent networkActivityIndicators

	var applicationActivityIndicators = 0
	extension UIApplication {
	func startActivityIndicator() {
	applicationActivityIndicators++
	UIApplication.sharedApplication().networkActivityIndicatorVisible = true
	}

	func stopActivityIndicator() {
	applicationActivityIndicators--
	if applicationActivityIndicators <= 0 {

berikv / gist:6765119

Last active December 24, 2015 07:39

Check iOS version

	if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_6_1) {
	// Load resources for iOS 6.1 or earlier
	} else {
	// Load resources for iOS 7 or later
	}

	// But only in XCode 5

berikv / heading.py

Last active May 6, 2018 21:24 — forked from timtrueman/heading.py

- Fix wrap to allow for bigger angles - Replace the hardcoded declination correction with an argument

	def wrap(angle):
	while angle > 2 * pi:
	angle -= 2 * pi
	while angle < 0:
	angle += 2 * pi
	return angle

	def magnetometer_readings_to_tilt_compensated_heading(bx, by, bz, phi, theta, declinationRadians=0):
	""" Takes in raw magnetometer values, pitch and roll and turns it into a tilt-compensated heading value ranging from -pi to pi (everything in this function should be in radians).
	The correct value for declinationRadians can be found online: http://magnetic-declination.com/countries.php note that this value is in radians, not in degrees.

Berik Visschers berikv