pdf_utils.h

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#ifndef PDF_UTILS_H
#define PDF_UTILS_H
 
#include <hpdf.h>
#include <iostream>
#include <string>
 
#include "pdf_exception.h"
#include "../utils.h"

inline void
  error_handler (const HPDF_STATUS   error_no,
                 const HPDF_STATUS   detail_no,
                 void         *user_data)
{
    throw PDFException(error_no, detail_no);
}

inline HPDF_REAL calculate_text_height(const HPDF_Page page, const std::string &text, const HPDF_REAL max_width,
                                       const HPDF_REAL line_height, const HPDF_REAL max_lines = NULL) {
    HPDF_REAL real_width;
    std::string current_text = text;
    size_t total_lines = 0;
 
    while (!current_text.empty()) {
        const HPDF_UINT len = HPDF_Page_MeasureText(page, current_text.c_str(), max_width, HPDF_TRUE, &real_width);
        if (len == 0) {
            break;
        }
        total_lines++;
        current_text = current_text.substr(len);
        if (max_lines != NULL and total_lines == max_lines) {
            break;
        }
    }
 
    return total_lines * line_height;
}

inline HPDF_REAL writeText(const HPDF_Page page, std::string text, const HPDF_REAL left,
                    const HPDF_REAL top, const HPDF_REAL line_height, const HPDF_REAL max_width, const _HPDF_TextAlignment alignment, const HPDF_REAL max_height) {
 
    const HPDF_REAL bottom = (max_height == NULL) ? NULL : (top - max_height);
 
    text = UTF8toISO8859_1(text);
 
    const HPDF_REAL textHeight = calculate_text_height(page, text, max_width, line_height, max_height);
 
    HPDF_Page_BeginText(page);
    HPDF_Page_TextRect(page, left, top, left + max_width, bottom, text.c_str(), alignment,
                       nullptr);
    HPDF_Page_EndText(page);
    return textHeight;
}

inline HPDF_REAL writeTextIfNotHeightExceeded(const HPDF_Page page, std::string text, const HPDF_REAL left,
                    const HPDF_REAL top, const HPDF_REAL line_height, const HPDF_REAL max_width, const _HPDF_TextAlignment alignment, const HPDF_REAL max_height) {
 
    const HPDF_REAL bottom = (max_height == NULL) ? NULL : (top - max_height);
 
    text = UTF8toISO8859_1(text);
 
    const HPDF_REAL textHeight = calculate_text_height(page, text, max_width, line_height, NULL);
 
    if (textHeight > max_height) {
        return 0;
    }
 
    HPDF_Page_BeginText(page);
    HPDF_Page_TextRect(page, left, top, left + max_width, bottom, text.c_str(), alignment,
                       nullptr);
    HPDF_Page_EndText(page);
    return textHeight;
}

inline HPDF_REAL writeText(const HPDF_Page page, std::string text, const HPDF_REAL left,
                    const HPDF_REAL top, const HPDF_REAL line_height, const HPDF_REAL max_width, const _HPDF_TextAlignment alignment, const int max_lines = 0) {
 
    const HPDF_REAL bottom = (max_lines == NULL) ? NULL : (top - max_lines * line_height);
 
    text = UTF8toISO8859_1(text);
 
    const HPDF_REAL textHeight = calculate_text_height(page, text, max_width, line_height, max_lines);
 
    HPDF_Page_BeginText(page);
    HPDF_Page_TextRect(page, left, top, left + max_width, bottom, text.c_str(), alignment,
                       nullptr);
    HPDF_Page_EndText(page);
    return textHeight;
}

inline HPDF_REAL writeTextIfNotLinesExceeded(const HPDF_Page page, std::string text, const HPDF_REAL left,
                    const HPDF_REAL top, const HPDF_REAL line_height, const HPDF_REAL max_width, const _HPDF_TextAlignment alignment, const int max_lines = 0) {
 
    const HPDF_REAL bottom = (max_lines == NULL) ? NULL : (top - max_lines * line_height);
 
    text = UTF8toISO8859_1(text);
 
    const HPDF_REAL textHeight = calculate_text_height(page, text, max_width, line_height, NULL);
    std::cout << textHeight << " " << max_lines * line_height << std::endl;
    if (textHeight > max_lines * line_height) {
        return 0;
    }
    HPDF_Page_BeginText(page);
    HPDF_Page_TextRect(page, left, top, left + max_width, bottom, text.c_str(), alignment,
                       nullptr);
    HPDF_Page_EndText(page);
    return textHeight;
}

inline HPDF_REAL changeFont(const HPDF_Page page, const HPDF_REAL font_size, const HPDF_Font font) {
    const float line_height = font_size * 1.2;
    HPDF_Page_SetFontAndSize(page, font, font_size);
    HPDF_Page_SetTextLeading(page, line_height);
    return line_height;
}

inline void drawLine(const HPDF_Page page, const HPDF_REAL from_x, const HPDF_REAL from_y, const HPDF_REAL to_x, const HPDF_REAL to_y) {
    HPDF_Page_MoveTo(page, from_x, from_y);
    HPDF_Page_LineTo(page, to_x, to_y);
    HPDF_Page_Stroke(page);
}
 
#endif //PDF_UTILS_H