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Note:
1) These may change in future versions of macOS.
2) Apple may also add more appearances or control accent colors in the future.
3) You probably don't want to hardcode color values.
4) Watch:
   https://developer.apple.com/videos/play/wwdc2018/210
   https://developer.apple.com/videos/play/wwdc2018/218

All colors specified in the sRGB color space.

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#include <math.h>
#include <Accelerate/Accelerate.h>

/* filter signal x with filter h and store the result in output. 
 * output must be at least as long as x
 */
 
void         
fft_fir_filter( const float *x, 
                unsigned x_length, 

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#!/usr/bin/ruby

s = ARGV[0]

if s =~ /^0x/ then
    n = s.hex
else
    n = s.to_i
end

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function ease(p) {
    p *= 5;

    if (p < 1) {
        return (-0.9 * Math.cos(p * (Math.PI / 2)) + 0.9 + (0.1 * p)) * 0.3;
    } else {
        p = ((p - 1) / 4);
        var p1 = p - 1;
        return (((p1 * p1 * p1 + 1) * 0.9) + p * 0.1) * 0.7 + 0.3;

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// Fade Ins:
    // Linear:
    for (let i = 0; i < length; i++) {
        array[i] = i / length;
    }

    // Exponential, Concave Up:
    let silence   = Math.pow(10.0, -120.0 / 20.0); // Silence is -120dB
    let fromValue = silence;

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#!/bin/sh

IFS=$'\n'
FORCE=0

compress_png () {
    more_args=""

    # Note: I use an "og_" prefix on a file to indicate "opaque and grayscale",
    # "g_" for grayscale, and "o_" for opaque.

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#!/bin/sh

IFS=$'\n'
FORCE=0

compress_png () {
    more_args=""

    if [[ $1 = og_* ]]; then
        more_args="-c 0"

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/*
    When MTSDebugTouchEvents() is called, -[UIApplication sendEvent:] will flash
    the views which receive touch events.
*/

@implementation UIApplication (MTSDebug)

- (void) mts_sendEvent_highlightTouches:(NSArray *)touches
{
    static NSMutableDictionary *sViewToWindowMap = nil;

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#
# Due to a change with the App Sandbox, Pixel Winch 1.1 cannot capture screenshots
# in the beta version of macOS Sierra.  As a workaround until Sierra GM, run the below commands.
#
# For more information, if you are a third party developer, check out:
# https://eternalstorms.wordpress.com/2016/08/01/screencapture-and-the-sandbox-in-macos-sierra/
# https://forums.developer.apple.com/message/152226#152226
#
# If you are an Apple engineer, check out:
# 27245600, 27610157, 27735823

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I tried to migrate to the non-MAS version of Sketch and had problems.

Steps I took:

1) I launched New Sketch.  I entered my e-mail address.  No e-mail received.
2) I launched MAS Sketch.  It crashed at launch and told me the app was damaged.
3) Ok, no problem, I trashed the app and reinstalled from the MAS's purchases tab
4) Download appeared in /Applications.  When MAS got to 100%, download disappeared.  I've seen this before with MAS software.
5) I had to trash the new version of Sketch as well, *and* empty trash.  
6) Re-download from the MAS.