HUD interpolation, and a POI marker test

mods/rgt_ui/init.lua

@@ -0,0 +1,46 @@
+-- The purpose of this module is to abstract away element theming in formspecs.
+-- While formspecs themselves are a good UI format, custom theming can become
+-- troublesome, especially when it needs to be added into every single formspec.
+-- This module also abstracts away the construction of some more complex widgets.
+
+ui = {}
+local ns = ui
+
+function ns.headers(w, h)
+    return "formspec_version[10]\
+        size["..w..","..h.."]\
+    "
+end
+
+function ns.container(x --[[Float]], y --[[Float]], body --[[String]]) --> String
+    return string.format("container[%f,%f]\
+    %s\
+    container_end[]\
+    ", x, y, body)
+end
+
+-- Note: This automatically creates the container's associated scrollbar, just in case scrollbar theming is ever added.
+function ns.scroll_container(x, y, width, height, name, orientation, factor, padding, body)
+    return string.format("scroll_container[%f,%f;%f,%f;%s;%s;%s;%s]\
+    %s\
+    scroll_container_end[]\
+    %s\
+    ", x, y, width, height, name or "", orientation or "", factor and tostring(factor) or "", padding or "", ns.scrollbar(x +width -0.25, y, 0.25, height, name, orientation))
+end
+
+function ns.scrollbar(x, y, width, height, name, value, main, max, smallstep, largestep, thumbsize, arrows)
+    local out = string.format("scrollbar[%f,%f;%f,%f;%s;%s]", x, y, width, height, name, value and tostring(value) or "")
+    return out
+end
+
+function ns.label(x --[[FLoat]], y --[[Float]], text --[[String]]) --> String
+    return string.format("label[%f,%f;%s]\n", x, y, text)
+end
+
+function ns.button(x --[[Float]], y --[[Float]], width --[[Float]], height --[[Float]], name --[[String?]], label --[[String?]]) --> String
+    return string.format("button[%f,%f;%f,%f;%s;%s]\n", x, y, name or "", label or "")
+end
+
+local function show_test_view()
+    ui.begin()
+end