django_hello.py 文件源码

def general_image(self, image_format='PNG'):
        fm_width = self.cleaned_data['width']
        fm_height = self.cleaned_data['height']

        key = '{}.{}.{}'.format(fm_width, fm_height, image_format)
        content = cache.get(key)
        if content is None:
            image = Image.new('RGB', (fm_width, fm_height), color=122)

            draw = ImageDraw.Draw(image)
            text = '{}x{}'.format(fm_width, fm_height)
            text_width, text_height = draw.textsize(text)

            if text_width < fm_width and text_height < fm_height:
                text_top = (fm_height - text_height) // 2
                text_left = (fm_width - text_width) // 2

                draw.text((text_top, text_left), text, fill=(255, 255, 255))

            content = BytesIO()
            image.save(content, image_format)
            content.seek(0)
            cache.set(key, content, 60 * 60)

        return content