terranigma_dmg_graph.lua

local xpos = 0
local ypos = 233-28

local timerOffset = 64
local baseColor   = 0x808080FF
local activeColor = 0x00FF00FF

local hidden = false

local function my_display()

  if hidden then
    return
  end

  gui.box(xpos,ypos-9,xpos+26,ypos-1,0x000000ff)
  gui.text(xpos+2,ypos-8,"Damage")

  gui.box(xpos,ypos,xpos+255,ypos+18,0x000000c0)
  gui.line(xpos+1+timerOffset,ypos+1,xpos+1+timerOffset,ypos+17,0xFF0000FF)

  local timer = AND(memory.readword(0x7e0042)-timerOffset,0x1ff)
  local graphy = ypos+9

  for i = 0,253 do

    local modSign
    if(AND(timer+i,0x100)==0) then
      modSign = 1
    else
     modSign = -1
    end

    local colorRatio = math.min(i/timerOffset,1)
    local mixedColor

    if(i>timerOffset) then
      mixedColor = baseColor
    else
      local mixedColorComponent = 0
      mixedColor = 0
      for n=0,3 do
        mixedColorComponent = (1-colorRatio)*AND(baseColor/math.pow(0x100,n),0xff)  +
                              (colorRatio)*AND(activeColor/math.pow(0x100,n),0xff)

        mixedColor = mixedColor + AND(math.min(mixedColorComponent,0xff),0xff)*math.pow(0x100,n)
      end
    end

    local graphx = xpos+i+1
    local amp = 4+AND(timer+i,0x4)

    if(AND(timer+i,0x8)==0) then
      gui.pixel(graphx,graphy,mixedColor)

    elseif(AND(timer+i,0xf)==0x8 or AND(timer+i,0xf)==0xf) then
      gui.line(graphx,graphy,graphx,graphy-modSign*amp,mixedColor)

    elseif(AND(timer+i,0xf)==0xc) then
      gui.line(graphx,graphy-modSign*4,graphx,graphy-modSign*8,mixedColor)

    else
      gui.pixel(graphx,graphy-modSign*amp,mixedColor)
    end
  end

end

-- Hook the display function to the GUI update
local on_gui_update_old = gui.register()
local function on_gui_update_new()
  if on_gui_update_old then
    on_gui_update_old()
  end
  my_display()
end
gui.register(on_gui_update_new)

-- Public functions
dmg_graph = {}

function dmg_graph.show()
  hidden = false
end

function dmg_graph.hide()
  hidden = true
end