Add prototype code for big text labels

big_text_labels.py

@@ -0,0 +1,93 @@
+#!/usr/bin/env python3
+
+from PIL import Image, ImageEnhance, ImageFont, ImageDraw
+from os import path
+
+def fit_text(text, script_dir, font_path, label_path, font_size, anchor="lt"):
+    img = Image.open(label_path)
+    draw = ImageDraw.Draw(img)
+    print(f"img.size: {img.size}")
+
+    font = ImageFont.truetype(font_path, size=font_size)
+    space_bbox = font.getbbox(" ", anchor=anchor)
+    [space_left, space_upper, space_right, space_lower] = space_bbox
+    space_width = abs(space_left) + abs(space_right)
+    space_height = abs(space_upper) + abs(space_lower)
+    print(f"font_size: {font_size} space_bbox: {space_bbox}")
+
+    text_cur = [0, 0]
+    line_bottom = 0
+
+    for word in text.split():
+        word_bbox = font.getbbox(word, anchor=anchor)
+        [word_left, word_upper, word_right, word_lower] = word_bbox
+        word_width = abs(word_left) + abs(word_right)
+        word_height = abs(word_upper) + abs(word_lower)
+
+        word_rec = [
+            word_left + text_cur[0],
+            word_upper + text_cur[1],
+            word_right + text_cur[0],
+            word_lower + text_cur[1],
+        ]
+        [rec_left, rec_upper, rec_right, rec_lower] = word_rec
+        line_bottom = max(rec_lower, line_bottom)
+
+        if rec_right > img.size[0]:
+            # new line, move down, start at left
+            text_cur = [0, line_bottom]
+            word_rec = [
+                word_left + text_cur[0],
+                word_upper + text_cur[1],
+                word_right + text_cur[0],
+                word_lower + text_cur[1],
+            ]
+            [rec_left, rec_upper, rec_right, rec_lower] = word_rec
+            line_bottom = max(rec_lower, line_bottom)
+
+
+        if rec_right > img.size[0]:
+            # word is currently extending off the right side of the page.
+            # despite doing a new line.
+            return False
+
+
+        # print(f"{word:>10}, word_bbox: {word_bbox}, word_rec: {word_rec}")
+        draw.text(text_cur, word, font=font, fill="black", anchor=anchor)
+        draw.rectangle(
+            word_rec, outline="#663399"
+        )  # optional. draw a border around the text.
+
+        # move over X direction
+        text_cur[0] += word_width + space_width
+
+    img.save(path.join(script_dir, "tmp.png"))
+
+    return line_bottom <= img.size[1]
+
+
+
+def main():
+    # I'm trying to make text as big as possible within a rectangle for generating labels
+    text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
+    #text = "UDIA"
+    text = 'a'*100
+    text = 'hello world sample sentence test'
+
+    script_dir = path.dirname(path.abspath(__file__))
+    label_path = path.join(script_dir, "label.png")
+    font_path = '/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf'
+
+    font_size_range = [1, 1000]
+    font_size = sum(font_size_range) // len(font_size_range)
+    while abs(font_size_range[0] - font_size_range[1]) > 1:
+        image_fit = fit_text(text, script_dir, font_path, label_path, font_size)
+        print(f"image_fit: {image_fit}, font_size: {font_size}, font_size_range={font_size_range}")
+        if image_fit:
+            font_size_range = [font_size, font_size_range[1]]
+        else:
+            font_size_range = [font_size_range[0], font_size]
+        font_size = sum(font_size_range) // len(font_size_range)
+
+if __name__ == "__main__":
+    main()