GE Lua Documentation

updateBoundaryAnimations

Definition

-- @/lua/ge/extensions/gameplay/crawl/boundary.lua:58

local function updateBoundaryAnimations(dtSim)
  if not boundaryObjects then
    return
  end

  local playerPos = nil
  if gameplay_crawl_utils and gameplay_crawl_utils.getPlayerPosition then
    playerPos = gameplay_crawl_utils.getPlayerPosition()
  else
    playerPos = core_camera.getPosition()
  end

  if not playerPos then
    return
  end

  if boundaryQuadtree then
    local visibleObjects = {}

    local queryX, queryY = playerPos.x, playerPos.y
    local queryRadius = visibilityRadius

    for objectId in boundaryQuadtree:queryNotNested(
      queryX - queryRadius, queryY - queryRadius,
      queryX + queryRadius, queryY + queryRadius
    ) do
      local objectInfo = boundaryObjects[objectId]
      if objectInfo and playerPos:distance(objectInfo.finalPosition) <= queryRadius then
        table.insert(visibleObjects, objectId)
      end
    end

    local visibleLookup = {}
    for _, objectId in ipairs(visibleObjects) do
      visibleLookup[objectId] = true
    end

    for objectId, objectInfo in pairs(boundaryObjects) do
      local obj = scenetree.findObjectById(objectId)
      if obj then
        local isCurrentlyVisible = visibleLookup[objectId] or false
        local wasVisible = objectInfo.lastVisible

        if isCurrentlyVisible and not wasVisible then
          objectInfo.animationState = "appearing"
          objectInfo.animationTimer = 0
          obj.hidden = false
        elseif not isCurrentlyVisible and wasVisible then
          objectInfo.animationState = "disappearing"
          objectInfo.animationTimer = 0
        end

        if objectInfo.animationState == "appearing" then
          objectInfo.animationTimer = objectInfo.animationTimer + dtSim

          if objectInfo.animationTimer >= animationDuration then
            objectInfo.animationState = "visible"
            objectInfo.animationTimer = 0
            obj:setScale(vec3(maxScale, maxScale, maxScale))
            obj:setField('instanceColor', 0, '1 1 1 1')
          else
            local scaleT = math.min(objectInfo.animationTimer / scaleUpDuration, 1.0)
            local alphaT = math.min(objectInfo.animationTimer / fadeInDuration, 1.0)

            local currentScale = lerp(minScale, maxScale, smootherstep(scaleT))
            local currentAlpha = lerp(0.0, 1.0, smootherstep(alphaT))

            obj:setScale(vec3(currentScale, currentScale, currentScale))
            obj:setField('instanceColor', 0, string.format('1 1 1 %.2f', currentAlpha))
          end

        elseif objectInfo.animationState == "disappearing" then
          objectInfo.animationTimer = objectInfo.animationTimer + dtSim

          if objectInfo.animationTimer >= fadeOutDuration then
            objectInfo.animationState = "hidden"
            objectInfo.animationTimer = 0
            obj.hidden = true
          else
            local alphaT = 1.0 - (objectInfo.animationTimer / fadeOutDuration)
            local currentAlpha = lerp(0.0, 1.0, smootherstep(alphaT))

            obj:setField('instanceColor', 0, string.format('1 1 1 %.2f', currentAlpha))
          end

        elseif objectInfo.animationState == "visible" then
          obj:setScale(vec3(maxScale, maxScale, maxScale))
          obj:setField('instanceColor', 0, '1 1 1 1')
        end

        objectInfo.lastVisible = isCurrentlyVisible

      else
        boundaryObjects[objectId] = nil
      end
    end
  end
end

Callers

local function updateCrawl(dtSim)
  gameplay_crawl_boundary.updateBoundaryAnimations(dtSim)