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@jordiboehme
jordiboehme / gist:3168819
Created July 24, 2012 08:25
iOS Pixel-to-Points conversion
+(CGFloat)pixelToPoints:(CGFloat)px {
CGFloat pointsPerInch = 72.0; // see: http://en.wikipedia.org/wiki/Point%5Fsize#Current%5FDTP%5Fpoint%5Fsystem
CGFloat scale = 1; // We dont't use [[UIScreen mainScreen] scale] as we don't want the native pixel, we want pixels for UIFont - it does the retina scaling for us
float pixelPerInch; // aka dpi
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
pixelPerInch = 132 * scale;
} else if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
pixelPerInch = 163 * scale;
} else {
pixelPerInch = 160 * scale;
@ndarville
ndarville / business-models.md
Last active January 13, 2024 17:27
Business models based on the compiled list at http://news.ycombinator.com/item?id=4924647. I find the link very hard to browse, so I made a simple version in Markdown instead.

Business Models

Advertising

Models Examples
Display ads Yahoo!
Search ads Google
@pcreux
pcreux / Gemfile
Last active December 11, 2023 20:24
Fast Rails + Heroku Configuration
group :production do
gem 'unicorn'
# Enable gzip compression on heroku, but don't compress images.
gem 'heroku-deflater'
# Heroku injects it if it's not in there already
gem 'rails_12factor'
end
@takuma7
takuma7 / opencv-fourcc-on-mac-os-x.md
Last active April 3, 2024 07:29
OpenCV Video Writer on Mac OS X
@alexruperez
alexruperez / UIImageTintCGExtension.swift
Last active March 2, 2021 13:54
UIImage tint with UIColor in Swift
extension UIImage
{
func tint(color: UIColor, blendMode: CGBlendMode) -> UIImage
{
let drawRect = CGRectMake(0.0, 0.0, size.width, size.height)
UIGraphicsBeginImageContextWithOptions(size, false, scale)
let context = UIGraphicsGetCurrentContext()
CGContextClipToMask(context, drawRect, CGImage)
color.setFill()
UIRectFill(drawRect)
@royshil
royshil / SimpleAdHocTracker.cpp
Created March 15, 2015 18:21
Ad-Hoc AR tracker from a planar scene without need for markers
/*
* SimpleAdHocTracker.cpp
*
* Created on: Mar 15, 2015
* Author: roy_shilkrot
*
* The MIT License (MIT)
*
* Copyright (c) 2015 Roy Shilkrot
*
@dynamicguy
dynamicguy / install-opencv-2.4.11-in-ubuntu.sh
Last active April 3, 2024 20:20
install opencv-2.4.11 in ubuntu
# install dependencies
sudo apt-get update
sudo apt-get install -y build-essential
sudo apt-get install -y cmake
sudo apt-get install -y libgtk2.0-dev
sudo apt-get install -y pkg-config
sudo apt-get install -y python-numpy python-dev
sudo apt-get install -y libavcodec-dev libavformat-dev libswscale-dev
sudo apt-get install -y libjpeg-dev libpng-dev libtiff-dev libjasper-dev
@acj
acj / ATTENTION.md
Last active May 5, 2023 12:23
Build a movie from jpeg images in Swift using AVFoundation

This code has moved

Please refer to the TimeLapseBuilder-Swift repository on GitHub from now on.

I will leave the original code here as a reference, but new comments may be removed. Please open an issue on GitHub if you have questions or would like to contribute.

Thanks!

//
// SimpleScrollingStack.swift
// A super-simple demo of a scrolling UIStackView in iOS 9
//
// Created by Paul Hudson on 10/06/2015.
// Learn Swift at www.hackingwithswift.com
// @twostraws
//
import UIKit
@travisnewby
travisnewby / CMDeviceMotion.swift
Last active November 12, 2022 17:13
Determine the direction of "gaze" of the device in any orientation
extension CMDeviceMotion {
func gaze(atOrientation orientation: UIInterfaceOrientation) -> SCNVector4 {
let attitude = self.attitude.quaternion
let aq = GLKQuaternionMake(Float(attitude.x), Float(attitude.y), Float(attitude.z), Float(attitude.w))
let final: SCNVector4
switch orientation {