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/*--- waitForKeyElements():  A utility function, for Greasemonkey scripts,
    that detects and handles AJAXed content.

    Usage example:

        waitForKeyElements (
            "div.comments"
            , commentCallbackFunction
        );

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-- https://www.lexaloffle.com/dl/docs/pico-8_manual.html#FILLP

local dither={
 0b0000000000000000,
 0b1000000000000000,
 0b1000000000100000,
 0b1010000000100000,
 0b1010000010100000,
 0b1010010010100000,
 0b1010010010100001,

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local bayerMatrix = {
    0, 8, 2, 10,
    12, 4, 14, 6,
    3, 11, 1, 9,
    15, 7, 13, 5
}

function ditherPixel(x, y, col1, col2, level)
    local threshold = bayerMatrix[x % 4 + y % 4 * 4 +1] -- Remove the +1 for 0-based arrays
    return (level < threshold) and col1 % 15 or col2 % 15

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When exporting your game with TIC-80, a binary specific to your scripting language is downloaded, and your game is injected into it. If you'd like to to fork and customize TIC-80 itself, you need to build those binaries yourself, and host them on your own http server.

This process will explain the steps specific to build TIC-80, but you will have to install some dependencies yourself. It is a step-by-step process that can largely be automated — and actually is through this project's build.yml.

Preparation

• Clone TIC-80 and make your changes
• Change the TIC_WEBSITE & TIC_HOST statics
  • The new host MUST be accessible through http, and MUST NOT redirect to https. It can be a subdomain.

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--[[
	Original: https://gist.github.com/tesselode/e1bcf22f2c47baaedcfc472e78cac55e
	moves rectangle A by (dx, dy) and checks for a collision
	with rectangle B.
	if no collision occurs, returns false.
	if a collision does occur, returns:
	- the time within the movement when the collision occurs (from 0-1)
	- the x component of the normal vector
	- the y component of the normal vector
	the goal is to find the time range in which rectangle A

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--[[
The idea of this tweetcart was to get the "water ripple" effect with a grid of points.

Each point is applied a sinusoidal effect,
	depending on its distance from the center, and the elapsed time.

The points go up then down following that sinusoidal,
	and a color gradient is applied to get a nice pseudo-3d effect.

You can copy-paste this whole code inside PICO-8 and just run it.

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--[[
	moves rectangle A by (dx, dy) and checks for a collision
	with rectangle B.

	if no collision occurs, returns false.

	if a collision does occur, returns:
	- the time within the movement when the collision occurs (from 0-1)
	- the x component of the normal vector
	- the y component of the normal vector

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function setting_sun()
  -- set the palette with all the necessary color,
  -- in the right order
  pal({10,-7,8,-7,10,14,1},1)

  -- circle radius
  radius=40

  -- start loop
  ::_::

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function sunrect()
  -- rainbow palette
  pal({1,-15,-13,3,-5,11,-6,10,9,-7,8,-8},1)
  -- origin x,y and radius
  ox,oy,r=64,64,60
  ::_::
  cls()
  -- 12 points for the 12 colors
  for i=1,12 do
    -- the 12 points are equally spread on the circle's top half

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-- gobals and tools

left,right,up,down,fire1,fire2=0,1,2,3,4,5
black,dark_blue,dark_purple,dark_green,brown,dark_gray,light_gray,white,red,orange,yellow,green,blue,indigo,pink,peach=0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15

--
-- simple ecs
-- https://github.com/namuol/pico8-ecs
--
local ecs = {}