How to prevent self.Health.bg from shining through in raid

[zork]

If a raid unit is out of range and you are using bright backgrounds the background will shine through and the whole frame will glow in light background color.

Example:


You can prevent this with two textures and some math.

createHealth

--create health frames
local createHealthFrame = function(self)
  
  -- health statusbar
  local h = CreateFrame("StatusBar", nil, self)
  h:SetAllPoints(self)
  h:SetStatusBarTexture("") --use transparent texture
  --save the width of the healthbar, important for later 
  h.w = self:GetWidth()
  
  --new bg texture
  local t = h:CreateTexture(nil,"BACKGROUND",nil,-6)
  t:SetPoint("TOPRIGHT",h,"TOPRIGHT",0,0)
  t:SetPoint("BOTTOMRIGHT",h,"BOTTOMRIGHT",0,0)
  t:SetWidth(0.01)
  t:SetTexture(self.cfg.health.texture)
  h.back = t
  
  --new fake statusbar
  local n = h:CreateTexture(nil,"BACKGROUND",nil,-6)
  n:SetPoint("TOPLEFT",h,"TOPLEFT",0,0)
  n:SetPoint("BOTTOMLEFT",h,"BOTTOMLEFT",0,0)
  n:SetPoint("RIGHT", t, "LEFT", 0, 0) --right point of n will anchor left point of t
  n:SetTexture(self.cfg.health.texture)
  h.new = n
 
  h.new:SetVertexColor(0.15,0.15,0.15,1)
  h.back:SetVertexColor(1,0,0,1)
  
  self.Health = h
  
end

postUpdateHealth

--post update health func
local postUpdateHealth = function(bar, unit, min, max)
  
  local d = floor(min/max*100)
  
  --apply bar width
  if d == 100 then
    bar.back:SetWidth(0.01) --fix (0) makes the bar go anywhere
  elseif d < 100 then
    local w = bar.w
    bar.back:SetWidth(w-(w*d/100)) --calc new width of bar based on size of healthbar
  end
 
end

Result:

[drakull]

Good solution, thanks for sharing it! I can see a couple of other uses for this fix.

This is the solution I came up with, change bg's color when not in range:

-- Create health bar
lib.addHealthBar = function(self)
    local health = CreateFrame('StatusBar', nil, self)
    health:SetStatusBarTexture(cfg.statusbar)
    health:GetStatusBarTexture():SetHorizTile(true)
    health:SetStatusBarColor(42/255,48/255,50/255)
 
    local healthBG = health:CreateTexture(nil, 'BORDER')
    healthBG:SetAllPoints(health)
    healthBG:SetTexture(cfg.statusbar)
    healthBG:SetVertexColor(1, 0.1, 0.1,1)
    health.bg = healthBG
 
    self.Health = health
end
 
-- Health Post Update
lib.PostUpdateRaidFrame = function(Health, unit, min, max)
    if not UnitInRange(unit) then
        Health.bg:SetVertexColor(0.6, 0.3, 0.3,1)
    else
        Health.bg:SetVertexColor(1, 0.1, 0.1,1)
    end
end

Not so classy, but works.