Implement label length restrictions, and label width recommendation

app.py

@@ -2,10 +2,10 @@
 from flask import Flask, render_template, request, redirect, url_for, session, send_from_directory
 from PIL import Image
 from gen_image import gen_image
-from printer_info import *
+from config import *
 from datetime import datetime
 from print import *
-from format_image import *
+from process_image import *
 from file_handler import *
 from colorama import Fore, Style
 import os
@@ -48,6 +48,15 @@ templates = {
 }
 
 
+def render_text_template(info=None, info_color=None):
+    return render_template('text.html', filename=session["text image path"], text1=session["text1"], text2=session["text2"], cut=session["cut"], info=info, info_color=info_color)
+
+
+
+def render_image_template(info=None, info_color=None):
+    return render_template('image.html', filename=session["uploaded image path"], cut=session["cut"], info=info, info_color=info_color, label_width=label_width)
+
+
 @app.route('/', methods=['GET', 'POST'])
 def base():
     check_for_new_user(session)
@@ -86,9 +95,18 @@ def image():
             filepath = get_file_path(session, session["uploaded image path"])
             file.save(filepath)
 
-            format_image(filepath).save(filepath)
+            message, status, img = process_image(filepath)
+            img.save(filepath)
 
-    return render_template('image.html', filename=session["uploaded image path"], cut=session["cut"])
+            if status == "Error":
+                session["uploaded image path"] = None
+                return render_image_template("Error: " + message, "red")
+
+            elif status == "Info":
+                session["text image path"] = None
+                return render_image_template("Info: " + message, "black")
+            
+    return render_image_template()
 
 
 #TODO: maybe merge some stuff with text-print
@@ -112,7 +130,7 @@ def image_print():
             print("printing")
             session["cut"] = False;
 
-    return render_template('image.html', filename=session["uploaded image path"], cut=session["cut"])
+    return render_image_template()
 
 
 @app.route('/text-template', methods=['GET', 'POST'])
@@ -128,7 +146,7 @@ def text_template():
         session["text2"] = template["text2"]
         session["cut"] = template["cut"]
 
-    return render_template('text.html', filename="text.png", text1=session["text1"], text2=session["text2"], cut=session["cut"])
+    return render_text_template()
 
 
 @app.route('/text-form', methods=['GET', 'POST'])
@@ -147,7 +165,11 @@ def text_form():
             "pos": int(request.form["pos2"]),
         }
 
-        img = gen_image(label_width, session["text1"], session["text2"])
+        message, status, img = gen_image(label_width, session["text1"], session["text2"])
+
+        if status == "Error":
+            session["text image path"] = None
+            return render_text_template(message, "red")
 
         get_folder_path(session)
 
@@ -156,14 +178,14 @@ def text_form():
         print()
         print(session["text image path"])
 
-    return render_template('text.html', filename=session["text image path"], text1=session["text1"], text2=session["text2"], cut=session["cut"])
+    return render_text_template()
 
 
 @app.route('/text', methods=['GET', 'POST'])
 def text():
     check_for_new_user(session)
 
-    return render_template('text.html', filename=session["text image path"], text1=session["text1"], text2=session["text2"], cut=session["cut"])
+    return render_text_template()
 
 
 @app.route('/text-print', methods=['GET', 'POST'])
@@ -173,8 +195,7 @@ def text_print():
     if request.method == 'POST':
         if session["text image path"] == None:
             print(Fore.YELLOW + "Warning, file doesn't exist" + Style.RESET_ALL)
-            return render_template('text.html', filename=session["text image path"], text1=session["text1"], text2=session["text2"], cut=session["cut"])
+            return render_text_template()
-
 
         image = format_image_to_label(get_file_path(session, session["text image path"]))
         print_image(image)
@@ -187,7 +208,7 @@ def text_print():
             print("printing")
             session["cut"] = False;
 
-    return render_template('text.html', filename=session["text image path"], text1=session["text1"], text2=session["text2"], cut=session["cut"])
+    return render_text_template()
 
 
 @app.route('/user_data/<filename>')
@@ -206,5 +227,5 @@ def generated_file(filename):
 
 
 if __name__ == "__main__":
-    app.run(debug=False)
+    app.run(debug=True)
 

config.py

@@ -2,3 +2,5 @@
 
 label_width = 213
 printer_width = 512
+
+max_label_length = 2000

gen_image.py

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 from PIL import Image, ImageDraw, ImageFont
 from colorama import Fore, Style
-from printer_info import *
+from config import *
 
 font = "resources/ComicMono.ttf"
 
@@ -27,14 +27,24 @@ def gen_image(height, text1, text2):
         print(Fore.YELLOW + "Warning, found situation where left corner of bbox of text != 0,", "text1_box:",  text1, "text2_box", text2)
     
     # the 1 here assures we don't get a 0 width image
-    img = Image.new('1', (max(text1_width, text2_width, 1), height), color=1)
+    width = max(text1_width, text2_width, 1)
+
+    img = Image.new('1', (width, height), color=1)
 
     draw = ImageDraw.Draw(img)
 
     draw.text((0, text1["pos"]), text1["string"], font=font1)
     draw.text((0, text2["pos"]), text2["string"], font=font2)
 
-    return img
+
+    if (width > max_label_length):
+        message = f"Label too long, max allowed length = {max_label_length}, yours = {width}."
+        status = "Error"
+    else:
+        message = None
+        status = None
+
+    return message, status, img
 
 Text1 = {
     "string": "Hello world",
@@ -48,4 +58,3 @@ Text2 = {
     "pos": 40,
 }
 
-gen_image(label_width, Text1, Text2).save('output.png')

print.py

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 dev_path="/dev/usb/lp0"
-from format_image import *
+from process_image import *
 from PIL import Image
 import ctypes
 import io

process_image.py

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 from PIL import Image
-from printer_info import *
+from config import *
 
 def format_image_to_label(path):
     image = Image.open(path)
@@ -11,10 +11,15 @@ def format_image_to_label(path):
 
     return new_image
 
-def format_image(path):
+def process_image(path):
     image = Image.open(path)
+    message = None
+    status = None
 
     if (image.height != label_width):
+        message = f"image height = {image.height} pixels, will be resized to fit {label_width}"
+        status = "Info"
+
         print("resizing image")
         new_height = label_width
         new_width = int(label_width * image.width / image.height)
@@ -22,7 +27,12 @@ def format_image(path):
         image = image.resize((new_width, new_height))
     
     image = image.convert('1', dither=Image.FLOYDSTEINBERG)
-    return image
+
+    if image.width > max_label_length:
+        message= f"Label too long, max allowed length = {max_label_length}, yours = {image.width}."
+        status = "Error"
+
+    return message, status, image
     
 
 #format_image("static/uploads/upload.png").save("output.png")

templates/base.html

@@ -29,6 +29,10 @@
         transition: background-color 0.3s ease;
     }
     
+    .info {
+        font-size: 20px;
+    }
+
     .box:hover {
         background-color: #f7a8b8; /* Softer pink on hover */
     }

templates/image.html

@@ -5,11 +5,15 @@
     <h1>Upload Image</h1>
     <form method="POST" action="/image" enctype="multipart/form-data">
         <input type="file" name="image">
-        <input type="submit" value="Generate preview">
+        <input type="submit" value="Generate preview"><br>
+        Recommended image height = {{label_width}}, taller images will be scaled
     </form>
 
+    {% if info %}
+    <p class="info" style="color: {{info_color}}">{{info}}</p>
+    {% endif %}
+
     {% if filename %}
-    <br><br>
     <img src="user_data/{{filename}}" alt="Uploaded image" style="height: 150px; width: auto;">
 
     <form method="POST" action="/image-print">

templates/text.html

@@ -32,8 +32,11 @@
         <input type="submit" value="Generate preview">
     </form>
 
+    {% if info %}
+    <p class="info" style="color: {{info_color}}">{{info}}</p>
+    {% endif %}
+
     {% if filename %}
-    <br><br>
     <img src="user_data/{{filename}}" alt="Generated Image" style="height: 150px; width: auto;">
 
     <form method="POST" action="/text-print">
@@ -48,5 +51,6 @@
     </form>
     {% endif %}
 
+
 {% endblock %}