[Lib] Bump collision

[AndyGFX]

Lua collision-detection library for axis-aligned rectangles.

Download: LIB-BumpCollision.zip

Source and docs

Usage:

local bump = require 'Libraries/bump'


local retro_fnt = Font.new('Fonts/pixelmix.ttf',8)

-- DEBUG DATA and callbacks
local bump_debug = {}
local intensityColors = {Color.new(32,32,32),Color.new(64,64,64),Color.new(128,128,128),Color.new(200,200,200)}
local borderColor=Color.new(0,0,255)


local function getCellRect(world, cx,cy)
  local cellSize = world.cellSize
  local l,t = world:toWorld(cx,cy)
  return l,t,cellSize,cellSize
end

function bump_debug.draw(world)
  local cellSize = world.cellSize
  local fontHeight = 6
  local topOffset = (cellSize - fontHeight) / 2
  for cy, row in pairs(world.rows) do
    for cx, cell in pairs(row) do
      local l,t,w,h = getCellRect(world, cx,cy)
      local intensity = math.min(cell.itemCount,#intensityColors) 
      local color=intensityColors[intensity]

      
      rect(l,t,l+w,t+h, color)
      
      text(tostring(cell.itemCount),l+cellSize/2, t+topOffset, borderColor)
	  
    end
  end
end

UP=0
DOWN=1
LEFT=2
RIGHT=3

CELL_SIZE=32

BLOCK_COLOR= Color.new(0,255,0,255)
PLAYER_COLOR=Color.new(255,0,0,255)


local world = bump.newWorld(CELL_SIZE)
local blocks = {}

local function addBlock(block)
  blocks[#blocks+1] = block
  world:add(block,block.x,block.y,block.w,block.h)
end

local function drawBlocks()
  for _,block in ipairs(blocks) do
    rect(block.x,block.y,block.x+block.w,block.y+block.h,false,block.color)    
  end
end

local function drawPlayer(player)
  rect(player.x,player.y,player.x+player.w,player.y+player.h,false,player.color)  
end

local function addPlayer(player)
  world:add(player,player.x,player.y,player.w,player.h)
end  

local A = {name="A",x=80,y=80,w=20,h=20,color=BLOCK_COLOR}
local B = {name="B",x=10,y=10,w=32,h=32,color=BLOCK_COLOR}
local C = {name="B",x=25,y=55,w=15,h=15,color=BLOCK_COLOR}
local player = {name="Player",x=50,y=50,w=16,h=16,color=PLAYER_COLOR,speed=1}
local mouse_pos = Vec2.new(0,0)
local info_pos = Vec2.new(160, 32)

addBlock(A)
addBlock(B)
addBlock(C)
addPlayer(player)


local dx, dy = 0, 0
local info = ""


function setup()
	-- prepare canvas
	local canvas= nil
	--canvas = Canvas.main
	--canvas:resize(320,200)
	
	
end

function update(delta)
	-- set font
	font(retro_fnt)
	text('DEMO: Bump collision',0,0)
	
	-- UPDATE
	info =""

	local x,y,b1,b2,b3 = mouse(1)
	mouse_pos.x = x
	mouse_pos.y = y
	player.x = mouse_pos.x
	player.y = mouse_pos.y

	
    player.x, player.y, cols, cols_len = world:move(player, player.x, player.y)
    	
    	
    for i=1, tonumber(cols_len) do
      	local col = cols[i]
      	info = "col.other: "..col.other.name..", col.type: "..col.type..", col.normal: "..tostring(col.normal.x) ..","..tostring(col.normal.y)      	
    end
	
	-- RENDER
	bump_debug.draw(world)
    drawBlocks()
    drawPlayer(player)
   
   	text(info,info_pos.x,info_pos.y, COLOR_YELLOW);
	
	
end