Преобразовать изображение в код (TikZ? PSTricks?)

Question

У меня есть ... pdf-файл, содержащий рисунки графиков, например, следующие:

Теперь второй график не так уж и сложно нарисовать на TikZ (я предполагаю... надеюсь? У меня нет никакого опыта, кроме рисования схем!), но вот такие фигуры, как на первой картинке, меня больше беспокоят. Я хочу перерисовать их в коде (например, в TikZ или любом другом пакете), чтобы они выглядели в более высоком качестве, чем если бы я просто сделал скриншот и выложил его в свой документ LaTeX.

Есть ли какие-либо инструменты, которые могут автоматически преобразовывать такие изображения в код? Он не должен быть идеальным, я могу подправить его по мере необходимости, я просто хотел бы, чтобы был хотя бы базовый код, чтобы мне не приходилось начинать каждый раз заново. Даже примеры, найденные в сети, не очень соответствуют чему-то вроде первой картинки, и я бы предпочел не просматривать горы примеров/pdf-файлов/инструкций, чтобы нарисовать что-то относительно простое. Так как же мне легко справиться с чем-то вроде первого рисунка в коде, т. е. преобразовать его в компилируемый код? Любая помощь будет оценена по достоинству!

Answer 1

Я бы рекомендовал комбинацию инструментов:

1. Инкскейп
2. svg2tikz

После установки Inkscape вы можете поместить svg2tikz в свой ./config/inkscape/extensionsкаталог и перезапустить программу, чтобы получить эту функциональность. Теперь вам просто нужно преобразовать растровое изображение в вектор. Inkscape имеет эту встроенную функциональность (версия 0.48).

Пошаговая инструкция:

1. Импортировать растровое изображениеFile->Import
2. Выберите растровое изображение и выберитеPath->Trace Bitmap
3. Настройте параметры по своему вкусу, в зависимости от изображения, мои параметры были
   • одиночное сканирование, порог яркости 0,8
   • подавить крапинку на 6px
   • Сглаживание углов на 1.00
   • Оптимизировать пути в 5.00
4. Выберите новый созданный путь. Вы можете выбрать Path->Simplifyна этом этапе, но я считаю алгоритм упрощения Inkscape слишком агрессивным.
5. Вы также можете захотеть разделить путь на области, используя Path->Break Apart. Это вызовет некоторую растерянность, когда у вас есть белое на черном, как в '0' или 'B'. Вам следует выбрать подпути, которые вам действительно нужны, и заново объединить их, используя Path->Exclusion.
6. Подправьте изображение. Я бы рекомендовал заменить буквы/цифры настоящим текстом, а также, возможно, заменить оси одинарными штриховыми линиями. Это значительно уменьшит общий размер вашего пути tikz.
7. Экспортируйте графику с помощью Extensions->Export->Export to TiKZ path Результаты приведены ниже.

Я сделал пару изменений, чтобы соответствовать лимиту SE в 40 000 символов. Я заменил текст перед экспортом, а затем вручную добавил метки осей. Я опубликовал только код для первого, но поместил оба выходных изображения ниже. Процедура та же самая. Я также обрезал десятичный выходной файл экспорта до 2 цифр (вместо 4) с помощью grep.

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