epervier-old/birb/modules/gui/elements/canvas.lua

local Parent = require "birb.modules.gui.elements.parent"
local CanvasElement = Parent:extend()

function CanvasElement:new(name, x, y, w, h, r,sx,sy,ox,oy, opacity)
    self:initCanvas()
    CanvasElement.super.new(self, name, x, y, w, h)
    self.r = r or 0
    self.sx, self.sy = sx or 1, sy or 1
    self.ox, self.oy = self:parseOrigin(ox, w), self:parseOrigin(oy, h)
    self.opacity = opacity or 1
end

function CanvasElement:initCanvas()
  self.canvas = {}
  self.canvas.needRedraw = true
  self.canvas.texture = nil
  self.canvas.isAnimated = false
  self.canvas.padding = 8
  self.canvas.final = nil
  self.canvas.dual = false
end

function CanvasElement:updateElement(dt)
  CanvasElement.super.updateElement(self, dt)
end

function CanvasElement:getCanvasDimensions()
  return self:getDimensions()
end

function CanvasElement:redraw()
  if (self.canvas.needRedraw or self.canvas.isAnimated) then
    self:generateTexture()
  end

  if (self.canvas.dual) then
    local w, h = self:getDimensions()
    local canvas = love.graphics.newCanvas(w + (self.canvas.padding*2), h + (self.canvas.padding*2))
    love.graphics.setCanvas(canvas)

    love.graphics.draw(self.canvas.texture, 0, 0)
    self:drawFinalTexture()

    self.canvas.final = canvas
    love.graphics.setCanvas()
  end
end

function CanvasElement:generateTexture()
  local w, h = self:getDimensions()

  local canvas = love.graphics.newCanvas(w + (self.canvas.padding*2), h + (self.canvas.padding*2))
  love.graphics.setCanvas(canvas)

  self:drawTexture()
  self.canvas.needRedraw = false
  love.graphics.setCanvas()
  if (self.canvas.isAnimated) then
    self.canvas.texture = canvas
  else
    local imageData = canvas:newImageData()
    self.canvas.texture = love.graphics.newImage(imageData)
    canvas:release()
    imageData:release()
  end
end

function CanvasElement:drawTexture()

end

function CanvasElement:drawFinalTexture()

end

function CanvasElement:parseOrigin(origin, size)
    if (origin == "center") then
        return size/2
    elseif (origin == "end") then
        return size
    else
        return origin or 0
    end
end

function CanvasElement:draw()
    love.graphics.setColor(1, 1, 1, self.opacity)
    local texture = self.canvas.texture
    if (self.canvas.dual) then
      texture = self.canvas.final
    end
    love.graphics.draw(texture, self.x - self.canvas.padding,self.y - self.canvas.padding,self.r,self.sx,self.sy,self.ox,self.oy)
    love.graphics.setColor(1, 1, 1, 1)
end

return CanvasElement