HoraceBury’s gists

HoraceBury / catmull.lua

Created August 2, 2018 09:54

Takes a table of x,y points and returns a smooth catmull-rom spline table of x,y points.

	-- catmull-rom-spline library

	-- Resources:
	-- https://gist.github.com/1383576
	-- http://codeplea.com/simple-interpolation
	-- http://codeplea.com/introduction-to-splines

	require("tablelib") -- https://gist.github.com/HoraceBury/9307117
	require("mathlib") -- https://gist.github.com/HoraceBury/9431861

HoraceBury / Program.cs

Created April 4, 2018 12:54

Executing an equation in C# proven with nUnit.

	using System;
	using NUnit.Framework;
	using System.Data;

	namespace RandomTests
	{
	[TestFixture]
	public class NumberTests
	{
	public static void Main(string[] args)

HoraceBury / displaylib.lua

Created March 21, 2018 09:44

Display library, adding to and modifying the existing Corona display library.

	-- display lib

	local newShapeList = {
	"newCircle",
	"newContainer",
	"newEmbossedText",
	"newEmitter",
	"newGroup",
	"newImage",
	"newImageRect",

HoraceBury / cyclingants.lua

Last active March 11, 2018 18:56

Cycling ants. Takes a pattern to be used for a mask outline and generates a collection of display groups which can be used to animate the cyclic pattern around a path shape. https://youtu.be/4cwjTrpvnFU

	require("mathlib")
	require("graphicslib")
	require("tablelib")

	local function asPoint( x, y )
	return { x=x, y=y }
	end

	local function getPoint( path, index )
	return { x=path[index], y=path[index+1] }

HoraceBury / graphicslib.lua

Last active March 21, 2018 09:45

Graphics extension library.

	-- graphics extension library

	require("mathlib") -- https://gist.github.com/HoraceBury/9431861
	require("displaylib") -- https://gist.github.com/HoraceBury/1e2ce033e3441823038eb88b551ad981

	-- https://math.stackexchange.com/questions/2269589/calculate-angle-of-the-next-point-on-a-circle
	--[[
	Generates a table of points containing the outline of a circle with each point 'step' pixels from the previous.

	Parameters:

HoraceBury / _shadowlib.lua

Last active May 8, 2018 05:52

Shadow library. Given a display group, this will ensure that non-physics-based shadows will be updated to track their parent, whether the parent is physics-based or not. The test sample demonstrates using physics to provide a shadow, as well.

	local lib = {}

	function lib.newShadowLayer( shadowgroup )
	local function refresh()
	if (shadowgroup and shadowgroup.numChildren) then
	for i=1, shadowgroup.numChildren do
	local shadow = shadowgroup[i]
	local object = shadowgroup[i].shadowparent

	if (not shadow.isBodyActive) then

HoraceBury / Cache.cs

Created August 21, 2017 12:14

Generic caching mechanism which makes sliding expiration easy.

	using System;
	using System.Collections.Generic;
	using System.Runtime.Caching;

	namespace CacheServices
	{
	public class Cache
	{
	protected MemoryCache _cache = new MemoryCache("general");

HoraceBury / dragitemscrollview.lua

Created December 30, 2016 14:48

Provides a scrollview widget which can have items dragged off it.

	local widget = require("widget")

	local function angleOf( ax, ay, bx, by, adjust, positive )
	local angle = math.atan2( by-ay, bx-ax ) * 180/math.pi

	if (adjust) then
	if (type(adjust) ~= "number") then adjust = -90 end
	angle = angle - adjust
	if (angle < -180) then angle=angle+360 end
	if (angle > 180) then angle=angle-360 end

HoraceBury / simple drag and rotate demo.lua

Last active November 27, 2024 04:03

This code was an answer to a forum question asking for a touch to drag an object but a tap-touch to rotate the object. I kept it simple and without reference to my mathlib.lua for the sake of brevity.

	local function angleOnTarget( e )
	local a = math.atan2( e.y-e.target.y, e.x-e.target.x ) * 180 / (4*math.atan(1))
	if (a<0) then a=a+360 end
	return a
	end

	local function tap(e)
	e.target.touchMode = "drag"
	print("drag mode")
	e.target.dragtimer = timer.performWithDelay( 400, function()

HoraceBury / circlelib.lua

Last active October 26, 2017 00:13

Create a portion of a fill or unfilled circle as a polygon and move it by it's circle-centre. Requires image: http://content.screencast.com/users/HoraceBury/folders/Default/media/18ea951e-71a1-44f4-a148-f2109a1c9059/brush2.png Download full solution: https://www.dropbox.com/s/8472upw9w2cwkwi/CircleLib.2015-12-02.001.zip?dl=0

	-- circle lib

	require("mathlib")
	display.setDefault( "isAnchorClamped", false )

	local min, max = -10000000000000, 10000000000000

	local cache = {}

	local circlelib = {}

HB HoraceBury