def getFontSizeByLanguage(string, font, renderer_lib, remove_height_offset=False):
# get fontsize according to language
string = cgi.escape(string) # Here preparing string to render if any special symbol found then convert into html code for render like(& to &)
if int(renderer_lib) == 1:
size = font.getsize(string)
if remove_height_offset:
size[1] -= font.getoffset(string)[1]
else:
size = pyImage.text(string, dpi=font['normal_font_size'], fontfile=font['normal_font_file']).width, pyImage.text(string, dpi=font['normal_font_size'], fontfile=font['normal_font_file']).height
x = pyImage.text(string, dpi=font['normal_font_size'], fontfile=font['normal_font_file'])
return size
def renderTextOnImage(text, abs_x, abs_y, background_image, font_file, text_color, font_size, max_width, renderer_lib=1, manage_abs_y=None, manage_abs_x=None, max_height=None, text_resizable=False, hide_extra_text=False, font_family=None, get_details=False, custom_offset=2):
"""
draw text on image on the basis of height width of a particular box and also make resizable to make best fit to the box
The variables are used in method:
text: your input text
abs_x: absolute value of axis x to render text from
abs_y: ablsolute value of axis y to render text from
background_image: background or base image to render text on it
font_file: font_file to render text with this font
text_color: give your custom color for text
font_size: give your own font size
font_family: this is font family name of the given font(like "Arial Bold" for Arial_Bold font)
max_width: maximum width for given aria(box width where text is to render)
renderer_lib: this is text renderer library if value is "1" then it will use "pillow" lib and if vlaue is "2" then it will use pyvips to render the text
manage_abs_x and y: these variables are to manage axis x and y in the given box(hieght, width) on image if vlaue is "center" then text will be in center(with respect y) bellow:
by default manage x and y manage_x= default and y="center" manage_x= default and y="down" manage_x= "center" and y=default manage_x= "right" and y=default manage_x= "center" and y="center"
__________________ ______________________ _____________________ ______________________ ______________________ ______________________
|text | | | | | | text | | text| | |
| | |text | | | | | | | | text |
|________________| |_____________________| |text ________________| |_____________________| |_____________________| |_____________________|
max_height: maximun height of the given box
text_resizable: It enamble the text resize to fit in the box according to height anbd width
hide_extra_text: removes extra text wich is overlapping the given box(in this situation text will not resize automatic)
get_details: return only details like(font, text_width, text_total_hieght)
custom offset: custom offset between two lines
"""
if font_size is None:
# There are situation when "font_size" is not known but the maximum height that a text will occupy is known. So with "text_resizable" set to true by default
# the correct "font_size" will automatically be obtained. And so we make the task easy for the user by ignoring passing an explicit value for it.
if max_height is None:
raise Exception("Both 'font_size' and 'max_height' cannot be None")
if int(renderer_lib) == 1:
font_size = max_height
else:
font_size = max_height*7
if int(renderer_lib) == 1:
custom_offset = 0
# background_image = Image.open(background_image)
draw = ImageDraw.Draw(background_image)
font = ImageFont.truetype(font_file, size=font_size)
else:
# background_image = pyImage.new_from_file(background_image)
font = {'normal_font_file': font_file, 'normal_font_size': font_size}
wrapped_text_array, text_width, text_total_height = getWrappedTextMaxHeightWidth(text, font, max_width, renderer_lib)
if text_resizable:
while (text_width > max_width or text_total_height>max_height) and font_size>0: # Limiting lines count by decreasing font_size and text_writing_space_width_in_pixel
if int(renderer_lib) == 1:
font_size -= 1
font = ImageFont.truetype(font_file, size=font_size)
else:
font_size -= 1
font.update({'normal_font_size': font_size})
wrapped_text_array, text_width, text_total_height = getWrappedTextMaxHeightWidth(text, font, max_width, renderer_lib)
text_total_height = text_total_height + (custom_offset*(len(wrapped_text_array)-1))
if hide_extra_text:
copy_text = "".join(wrapped_text_array)
while (text_width > max_width or text_total_height>max_height) and font_size>0: # Limiting lines count by decreasing font_size and text_writing_space_width_in_pixel
text = text[:-1]
wrapped_text_array, text_width, text_total_height = getWrappedTextMaxHeightWidth(text, font, max_width, renderer_lib)
text_total_height = text_total_height + (custom_offset*(len(wrapped_text_array)-1))
if len("".join(wrapped_text_array)) != len(copy_text):
wrapped_text_array[-1] = wrapped_text_array[-1][:-3] + "..."
if get_details:
return font, text_width, text_total_height
if manage_abs_y and max_height:
if manage_abs_y=="center" and (max_height-text_total_height)>0:
abs_y = abs_y + (max_height-text_total_height)/2
if manage_abs_y=="down" and (max_height-text_total_height)>0:
abs_y = abs_y + (max_height-text_total_height)
reset_abs_x = abs_x
for line in wrapped_text_array:
if manage_abs_x:
text_line_width = getFontSizeByLanguage(line, font, renderer_lib)[0]
if manage_abs_x=="center" and (max_width-text_line_width)>0:
abs_x = reset_abs_x + (max_width-text_line_width)/2
if manage_abs_x=="right" and (max_width-text_line_width)>0:
abs_x = reset_abs_x + (max_width-text_line_width)
if int(renderer_lib) == 1:
text_height = font.getsize(line)[1]
abs_y -= font.getoffset(line)[1] # remove top y_offset value from abs_y to draw text from exact axis(x, y)
draw.text((abs_x, abs_y), line, fill=text_color, font=font)
abs_y += text_height + font.getoffset(line)[1]
else:
text_height = getFontSizeByLanguage(line, font, renderer_lib)[1]
line = cgi.escape(line) # Here preparing string to render if any special symbol found then convert into html code for render like(& to &)
text = pyImage.text(line, dpi=font['normal_font_size'], font=font_family, fontfile=font_file, align = "centre")
# print(font_file, line, font['normal_font_size'])
# we'll use that as the alpha scale down to make it transparent
alpha = (text).cast("uchar")
# make a blue rectangle the same size and tag as srgb
overlay = text.new_from_image(list(text_color)).copy(interpretation="srgb")
# attach the alpha
overlay = overlay.bandjoin(alpha)
# load an image and composite on the overlay
background_image = background_image.composite2(overlay, 'over', x = abs_x, y = abs_y)
abs_y += text_height + custom_offset
return font, background_image
