Client side table management for supplier sections

app/assets/javascripts/supplier/app/models/section.js.coffee

@@ -6,3 +6,61 @@ App.Section = DS.Model.extend
   tables: DS.hasMany('table')
   section_elements: DS.hasMany('section-element')
   section_areas: DS.hasMany('section-area')
+  arrange_tables_in_grid: (tables)->
+    epsilon = 1e-10
+    tables ||= @get('tables').sortBy('number')
+    w = parseFloat(@get('width'))
+    h = parseFloat(@get('height'))
+    n = parseInt(tables.get('length'))
+    unless w > 0 and h > 0 and n > 0
+      console.log "Cannot arrange tables in grid since not all conditions are met"
+      return false
+    [lx, ly] = App.Distribution.distribute_lattice(w, h, n)
+    return unless lx > 0 and ly > 0
+    console.log "Distributing tables in grid using lx: #{lx}, ly: #{ly}"
+    x0 = lx/2
+    x = x0
+    y = ly/2
+    tables.forEach (table)->
+      if x > w + (1e4*epsilon) # New row,  error = epsilon times possible tables in a row
+        x = x0
+        y += ly
+      table.set 'position_x', x - table.get('width')/2 # Starting point of square + half the square (center) minus half the table size
+      table.set 'position_y', y - table.get('height')/2
+      x += lx
+  arrange_tables_in_rows_of: (n, tables)->
+    return false unless n
+    n = parseInt(n)
+    return false unless n > 0
+    tables ||= @get('tables').sortBy('number')
+    width = parseFloat(@get('width'))
+    height = parseFloat(@get('height'))
+    dx = width / n
+    dy = height / Math.ceil(tables.get('length')/n)
+    x = 0.0
+    y = 0.0
+    tables.forEach (table, i)->
+      table.set 'position_x', x + (dx/2) - (table.get('width')/2)
+      table.set 'position_y', y + (dy/2) - (table.get('height')/2)
+      x += dx
+      if (i + 1) % n  is 0
+        x = 0.0
+        y += dy
+  arrange_tables_in_columns_of: (n, tables)->
+    return false unless n
+    n = parseInt(n)
+    return false unless n > 0
+    tables ||= @get('tables').sortBy('number')
+    width = parseFloat(@get('width'))
+    height = parseFloat(@get('height'))
+    dx = width / Math.ceil(tables.get('length') / n)
+    dy = height / n
+    x = 0.0
+    y = 0.0
+    tables.forEach (table, i)->
+      table.set 'position_x', x + (dx/2) - (table.get('width')/2)
+      table.set 'position_y', y + (dy/2) - (table.get('height')/2)
+      y += dy
+      if (i + 1) % n  is 0
+        y = 0.0
+        x += dx