📦 plotter chart auto-resizing for #38

src/telem/lib/Backplane.lua

@@ -179,6 +179,28 @@ function Backplane:cycleEvery(seconds)
     return selfCycle
 end
 
+-- trigger eager layout updates on all attached outputs with updateLayout functions
+function Backplane:updateLayouts()
+    self:dlog('Backplane:updateLayouts :: Updating layouts...')
+
+    for _, key in pairs(self.outputKeys) do
+        local output = self.outputs[key]
+
+        if type(output.updateLayout) == 'function' then
+            self:dlog('Backplane:updateLayouts ::  - ' .. key)
+
+            local results = {pcall(output.updateLayout, output)}
+
+            if not table.remove(results, 1) then
+                t.log('Update layout fault for "' .. key .. '":')
+                t.pprint(table.remove(results, 1))
+            end
+        end
+    end
+
+    self:dlog('Backplane:updateLayouts :: Layouts updated')
+end
+
 function Backplane:debug(debug)
     self.debugState = debug and true or false
 

src/telem/lib/output/plotter/ChartLineOutputAdapter.lua

@@ -47,13 +47,21 @@ function ChartLineOutputAdapter:register ()
         self:dlog('ChartLineOutputAdapter:boot :: plotter ready.')
     end
 
-    self.plotter = plotterFactory(self.win)
+    self:updateLayout()
 
     for i = 1, self.MAX_ENTRIES do
         t.constrainAppend(self.plotData, self.plotter.NAN, self.MAX_ENTRIES)
     end
 end
 
+function ChartLineOutputAdapter:updateLayout (bypassRender)
+    self.plotter = plotterFactory(self.win)
+
+    if not bypassRender then
+        self:render()
+    end
+end
+
 function ChartLineOutputAdapter:write (collection)
     assert(o.instanceof(collection, MetricCollection), 'Collection must be a MetricCollection')
 
@@ -69,6 +77,18 @@ function ChartLineOutputAdapter:write (collection)
         self.gridOffsetX = 0
     end
 
+    -- lazy layout update
+    local winw, winh = self.win.getSize()
+    if winw ~= self.plotter.box.term_width or winh ~= self.plotter.box.term_height then
+        self:updateLayout(true)
+    end
+
+    self:render()
+
+    return self
+end
+
+function ChartLineOutputAdapter:render ()
     local dataw = #{self.plotData}
 
     local actualmin, actualmax = math.huge, -math.huge
@@ -134,8 +154,6 @@ function ChartLineOutputAdapter:write (collection)
     end
 
     self.win.setVisible(true)
-
-    return self
 end
 
 return ChartLineOutputAdapter