使用RubyPDF::Writer或Ruport显示数学能力?

我写了一个快速算法来做我需要做的事情。希望它也能为你工作。唯一的要求是使用pdf::writer。下面的方法是使用pdf::writer和ruport。但是,如果您不使用ruport,您只需要更改“draw_-text”方法。将其替换为pdf::writer“text”方法。

def draw_text_with_exponent(text, left, font_size)
    exponent_offset = 1
    font_size_reduction = 5

    words = text.split(" ")

    buffer = ""
    words.each() do |word|
        if (word.gsub("**", '') == word)
            buffer += word + " "
        else
            number = word.split("**")
            base = number[0]
            exponent = number[1]

            buffer += base
            draw_text(buffer, :left => left, :font_size => font_size)
            left += pdf_writer.text_line_width(buffer, font_size)

            pdf_writer.y+=exponent_offset
            draw_text(exponent, :left => left, :font_size => font_size - font_size_reduction)
            left += pdf_writer.text_line_width(exponent, font_size)
            buffer = ""
            pdf_writer.y-=exponent_offset
        end
    end

    if (buffer.length > 0)
        draw_text(buffer, :left => left, :font_size => font_size)
    end
end

以下是一个示例调用:

draw_text_with_exponent("The numbers are x**2 and y**3 ok?", 50, 11)

如果你对这个方法有什么问题,或者你找到了我最初问题的答案,请告诉我。

JP