108 lines
4.6 KiB
Python
108 lines
4.6 KiB
Python
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import cv2
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def put_text(img, text, org, font_face, font_scale, color, thickness=1, line_type=8, bottom_left_origin=False):
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"""Utility for drawing text with line breaks
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:param img: Image.
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:param text: Text string to be drawn.
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:param org: Bottom-left corner of the first line of the text string in the image.
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:param font_face: Font type. One of FONT_HERSHEY_SIMPLEX, FONT_HERSHEY_PLAIN, FONT_HERSHEY_DUPLEX,
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FONT_HERSHEY_COMPLEX, FONT_HERSHEY_TRIPLEX, FONT_HERSHEY_COMPLEX_SMALL,
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FONT_HERSHEY_SCRIPT_SIMPLEX, or FONT_HERSHEY_SCRIPT_COMPLEX, where each of the font ID’s
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can be combined with FONT_ITALIC to get the slanted letters.
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:param font_scale: Font scale factor that is multiplied by the font-specific base size.
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:param color: Text color.
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:param thickness: Thickness of the lines used to draw a text.
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:param line_type: Line type. See the line for details.
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:param bottom_left_origin: When true, the image data origin is at the bottom-left corner.
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Otherwise, it is at the top-left corner.
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:return: None; image is modified in place
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"""
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# Break out drawing coords
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x, y = org
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# Break text into list of text lines
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text_lines = text.split('\n')
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# Get height of text lines in pixels (height of all lines is the same)
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_, line_height = cv2.getTextSize('', font_face, font_scale, thickness)[0]
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# Set distance between lines in pixels
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line_gap = line_height // 3
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for i, text_line in enumerate(text_lines):
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# Find total size of text block before this line
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line_y_adjustment = i * (line_gap + line_height)
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# Move text down from original line based on line number
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if not bottom_left_origin:
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line_y = y + line_y_adjustment
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else:
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line_y = y - line_y_adjustment
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# Draw text
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cv2.putText(img,
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text=text_lines[i],
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org=(x, line_y),
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fontFace=font_face,
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fontScale=font_scale,
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color=color,
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thickness=thickness,
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lineType=line_type,
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bottomLeftOrigin=bottom_left_origin)
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def put_centered_text(img, text, font_face, font_scale, color, thickness=1, line_type=8):
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"""Utility for drawing vertically & horizontally centered text with line breaks
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:param img: Image.
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:param text: Text string to be drawn.
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:param font_face: Font type. One of FONT_HERSHEY_SIMPLEX, FONT_HERSHEY_PLAIN, FONT_HERSHEY_DUPLEX,
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FONT_HERSHEY_COMPLEX, FONT_HERSHEY_TRIPLEX, FONT_HERSHEY_COMPLEX_SMALL,
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FONT_HERSHEY_SCRIPT_SIMPLEX, or FONT_HERSHEY_SCRIPT_COMPLEX, where each of the font ID’s
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can be combined with FONT_ITALIC to get the slanted letters.
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:param font_scale: Font scale factor that is multiplied by the font-specific base size.
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:param color: Text color.
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:param thickness: Thickness of the lines used to draw a text.
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:param line_type: Line type. See the line for details.
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:return: None; image is modified in place
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"""
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# Save img dimensions
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img_h, img_w = img.shape[:2]
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# Break text into list of text lines
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text_lines = text.split('\n')
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# Get height of text lines in pixels (height of all lines is the same; width differs)
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_, line_height = cv2.getTextSize('', font_face, font_scale, thickness)[0]
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# Set distance between lines in pixels
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line_gap = line_height // 3
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# Calculate total text block height for centering
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text_block_height = len(text_lines) * (line_height + line_gap)
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text_block_height -= line_gap # There's one less gap than lines
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for i, text_line in enumerate(text_lines):
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# Get width of text line in pixels (height of all lines is the same)
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line_width, _ = cv2.getTextSize(text_line, font_face, font_scale, thickness)[0]
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# Center line with image dimensions
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x = (img_w - line_width) // 2
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y = (img_h + line_height) // 2
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# Find total size of text block before this line
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line_adjustment = i * (line_gap + line_height)
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# Adjust line y and re-center relative to total text block height
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y += line_adjustment - text_block_height // 2 + line_gap
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# Draw text
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cv2.putText(img,
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text=text_lines[i],
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org=(x, y),
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fontFace=font_face,
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fontScale=font_scale,
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color=color,
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thickness=thickness,
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lineType=line_type)
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