1 files changed, 132 insertions, 0 deletions
diff --git a/src/lua/embed/debug.lua.h b/src/lua/embed/debug.lua.h
new file mode 100644
index 0000000..79c95ba
--- /dev/null
+++ b/src/lua/embed/debug.lua.h
@@ -0,0 +1,132 @@
+/* debug.lua */
+static const char* debug_lua = R"(
+--[[ 
+    for debug purpose 
+    +-------------------+
+    |debug msg old      |
+    |...                |
+    |...                |
+    |...                |
+    |debug msg new      |
+    +-------------------+
+]] 
+
+jin.debug = jin.debug or {} 
+
+-- render panel 
+local panel = nil 
+
+local debug = false
+
+-- debug msg buffer 
+local buffer = {} 
+
+-- configure 
+local bsize   = 10
+local fsize   = 15
+local lheight = 18
+local alpha   = 220
+local margin  = 10
+
+-- refresh buffer or not 
+local refresh = true 
+
+function jin.debug.init()
+    debug = true
+    panel = jin.graphics.Canvas(jin.graphics.size()) 
+end
+
+-- set buffer size 
+function jin.debug.size(c)
+    bsize = c
+end 
+
+function jin.debug.print(msg)
+    if not debug then return end 
+
+    msg = tostring(msg)
+    local tp = type(msg)
+    if tp ~= "string" and tp ~= "number" then 
+        msg = string.format("print failed, expect string or number but get a %s", tp)
+    end
+    
+    -- remove the first one (old msg)
+    if #buffer >= bsize then 
+        table.remove(buffer, 1)
+    end 
+    
+    buffer[#buffer + 1] = msg
+    refresh = true
+end
+
+-- clear debug buffer 
+function jin.debug.clear()
+    buffer = {} 
+end
+
+local function getStrHeight(str, lheight) 
+    local h = lheight
+    if #str == 0 then 
+        h = 0
+    end 
+    for i = 1, #str do 
+        local c = string.sub(str, i, i)
+        if c == '\n' then 
+            h = h + lheight
+        end 
+    end 
+    return h 
+end
+
+local  function getBgQuad() 
+    local width, height = 0, 0     
+    for i = 1, #buffer do
+        local w, h = jin.graphics.box( buffer[i], fsize, 1, lheight)
+        height = height + h 
+        if width < w then
+            width = w 
+        end 
+    end    
+    return width, height
+end 
+
+-- render to screen
+function jin.debug.render() 
+    if not debug then return end
+    
+    if refresh then 
+       
+        jin.graphics.bind(panel)
+
+            jin.graphics.clear(0, 0, 0, 0)
+            
+            jin.graphics.study()
+            
+            local ww, wh = jin.graphics.size()
+            local bgw, bgh = getBgQuad()
+            jin.graphics.color(0, 0, 0, alpha)
+            jin.graphics.rect("fill", 0, wh - bgh - margin, bgw + margin, bgh + margin)
+            
+            jin.graphics.color()
+            local y = wh 
+            for i = #buffer, 1, -1 do
+                local msg = buffer[i] 
+                local h = getStrHeight(msg, lheight)
+                y = y - h 
+                jin.graphics.write(msg, margin / 2, y - margin/ 2, fsize, 1, lheight) 
+            end
+    
+        jin.graphics.bind()
+    
+        refresh = false
+    end 
+    
+    jin.graphics.color()
+    jin.graphics.draw(panel, 0, 0)
+end
+
+function jin.debug.status() 
+    return debug 
+end
+
+)";
+\ No newline at end of file