Larger boxes ; avoid feedback on confusing letters

annotating_with_checks.py

@@ -8,8 +8,8 @@ import img2pdf
 from reportlab.pdfgen import canvas
 
 # Fix for Matplotlib in threads: Set backend to non-interactive 'Agg'
-import matplotlib
-matplotlib.use('Agg')
+# import matplotlib
+# matplotlib.use('Agg')
 
 from PIL import Image, ImageDraw, ImageFont
 import annotating
@@ -19,7 +19,7 @@ from annotating import MARGIN_LEFT, ANNOT_WIDTH
 LATEX_LOCK = threading.Lock()
 DPI = 100
 BOX_SIZE = 30
-SCORE_BOX_SIZE = 30
+SCORE_BOX_SIZE = 40
 SCORES = [x * 0.5 for x in range(9)]  # 0.0 to 4.0
 
 try:
@@ -60,12 +60,13 @@ class CheckboxRenderer:
                 # Draw score boxes
                 start_x = pos['w'] + 20
                 for val in SCORES:
-                    box = draw_checkbox(draw, start_x, pos['y'] + 25, BOX_SIZE, str(val))
+                    box = draw_checkbox(draw, start_x, pos['y'] + 25,
+                                        SCORE_BOX_SIZE, str(val))
                     self.checkboxes.append({
                         "type": "score", "label": self.label, "value": val,
                         "rel_box": box # Will be adjusted for global Y later
                     })
-                    start_x += BOX_SIZE + 60
+                    start_x += SCORE_BOX_SIZE + 60
             elif meta.get("type") == "global_fb":
                 # Draw delete box for global feedback
                 bx = pos['w'] - BOX_SIZE - 5

correction.py

@@ -71,6 +71,10 @@ isn't, provide the coordinates where the word «continuous» is. If a
 calculation went wrong, gives the coordinates of the step where it
 goes wrong, and as feedback, what went wrong.
 
+Avoid giving feedback about confusing letters `n` with `m`, `x` with
+`n` or `h` with `k`. If it looks wrong, assume you read it wrong,
+unless the distinction is very important.
+
 You should also give me a measure of confidence, from 0 to 1 that you
 were able to correctly understand the answer. A score below 0.5 means
 that you think it is likely that you couldn't understand an important