822

826

survey_animation = function()
---[[
	local minx, miny, maxx, maxy = surface_bounds(Definitions)
	local zoom = math.min(App.screen.width/(maxx-minx), App.screen.height/(maxy-miny))
	Animating = {
		{x=minx, y=miny, w=maxx-minx, h=maxy-miny, zoom=zoom},
		{x=Viewport.x, y=Viewport.y, w=Viewport.w, h=Viewport.h, zoom=Viewport.zoom},
	}
	Viewport.x = -App.screen.width/2
	Viewport.y = -App.screen.height/2
	Viewport.w = App.screen.width
	Viewport.h = App.screen.height
	Viewport.zoom = 1.0  --]]
end

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animate_next_frame = function(state, dt)
	if state.initial == nil then
		state.initial = from_viewport(state)
		-- once we've checked keys, pollute the keyspace
		state.step = 0
		state.frame_time = 0
		return
	end
	state.frame_time = state.frame_time + dt
	if state.frame_time > 0.01 then
		state.frame_time = state.frame_time - 0.01
		state.step = state.step+1
		interpolate_viewport(state.initial, state, state.step)
		B()
	end
end

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interpolate_viewport = function(initial, final, step)
	for k,v in pairs(initial) do
		Viewport[k] = (initial[k]*(10-step) + final[k]*step) / 10
	end
end

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from_viewport = function(state)
	local result = {}
	for k,v in pairs(state) do
		if Viewport[k] then
			result[k] = Viewport[k]
		end
	end
	return result
end