jminor · February 12, 2019 08:36 · Feb 12, 2019
diff --git a/main.lua b/main.lua
@@ -0,0 +1,121 @@
+-- Sprite Editor
+
+-- Paste any sized sprite into this block to edit it.
+-- After drawing, copy the text from the console.
+img = [[
+...cc.ccc.
+.cccccccc.
+.cYYcYYYc.
+YYgWYYgWcY
+YYYYYYYYYY
+.YRYYYYRY.
+.YYRRRRY..
+....YY....
+.MmMYYmMm.
+.MmMmMmMm.
+]]
+
+sprite = am.sprite(img)
+pixels = sprite.spec.texture.image_buffer.buffer:view('uint')
+size = vec2(sprite.width, sprite.height)
+
+win = am.window{
+    title = "Sprite Editor",
+    width = size.x,
+    height = size.y,
+    clear_color = vec4(0, 0, 0, 1)
+}
+
+win.scene = sprite
+
+function rgba2uint(color)
+    return
+        math.floor(color.a * 255) * 16777216 + 
+        math.floor(color.b * 255) * 65536 + 
+        math.floor(color.g * 255) * 256 + 
+        math.floor(color.r * 255)
+end
+
+function uint2rgba(uint)
+    local a = math.floor(uint / 16777216) / 255
+    uint = uint - math.floor(a * 255) * 16777216
+
+    local b = math.floor(uint / 65536) / 255
+    uint = uint - math.floor(b * 255) * 65536
+
+    local g = math.floor(uint / 256) / 255
+    uint = uint - math.floor(g * 255) * 256
+
+    local r = math.floor(uint) / 255
+
+    return vec4(r,g,b,a)
+end
+
+-- add clear into the map, so we can draw with it
+am.ascii_color_map['.'] = vec4(0,0,0,0)
+
+-- starting color
+color = rgba2uint(am.ascii_color_map['W'])
+
+function lookup_color(c)
+    local cuint = rgba2uint(c)
+    for k,v in pairs(am.ascii_color_map) do
+        if rgba2uint(v) == cuint then
+            return k
+        end
+    end
+    return "?"
+end
+
+function handle_key(k)
+    if k == 'escape' then
+        pixels:set(0)
+        return
+    end
+    if k == 'period' then
+        k = '.'
+    end
+    if win:key_down("lshift") or win:key_down("rshift") then
+        k = string.upper(k)
+    end
+    local c = am.ascii_color_map[k]
+    if c ~= nil then
+        color = rgba2uint(c)
+        print("color", k, "=", c, string.format("%x",color))
+        return
+    else
+        print("unrecognized key:", k)
+    end
+end
+
+print("Available colors:")
+print(table.tostring(am.ascii_color_map))
+print("Press any of these keys to pick a color.")
+print("Press ESCAPE to clear.")
+
+sprite:action(function()
+    for _,k in ipairs(win:keys_pressed()) do
+        handle_key(k)
+    end
+    if win:mouse_down"left" then
+        local p = win:mouse_position() + size/2
+        p = vec2(math.floor(p.x), math.floor(p.y))
+        local i = p.x + p.y * win.width + 1
+        if i>=1 and i<=size.x*size.y then
+            pixels[i] = color
+        end
+    end
+    if win:mouse_released"left" then
+        print("img = [[")
+        for y = 0,size.y-1 do
+            local row=""
+            for x = 0,size.x-1 do
+                local i = x + (size.y - y - 1) * size.x + 1
+                local pix = pixels[i]
+                row = row .. lookup_color(uint2rgba(pix))
+            end
+            print(row)
+        end
+        print("]]")
+    end
+end)
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