libharu 0.1.5

extern crate libharu;
extern crate anyhow;

use libharu::prelude::*;

mod util;

fn show_stripe_pattern<T:Into<Point>>(page: &PageDescriptionMode, p: T) -> anyhow::Result<()> {
    let p = p.into();

    let mut iy = 0.0;
    while iy < 50.0 {
        page.set_rgb_stroke((0.0, 0.0, 0.5))?;
        page.set_line_width(1.0)?;
        page.run_path_mode(|page|{
            page.move_to((p.x, p.y + iy))?;
            page.line_to((p.x + page.text_width("ABCabc123")?, p.y + iy))?;
            page.stroke()?;
            Ok(())
        })?;
        iy = iy + 3.0;
    }

    Ok(())
}

fn show_description(page: &PageDescriptionMode, x: Real, y: Real, text: &str) -> anyhow::Result<()> {
    let fsize = page.current_font_size()?;
    let font = page.current_font()?;
    let color = page.rgb_fill()?;

    page.run_text_mode(|page|{
        page.set_rgb_fill((0.0, 0.0, 0.0))?;
        page.set_text_rendering_mode(TextRenderingMode::Fill)?;
        page.set_font_and_size(&font, 10.0)?;
        page.text_out((x, y - 12.0), text)?;
        Ok(())
    })?;

    page.set_font_and_size(&font, fsize)?;
    page.set_rgb_fill(color)?;

    Ok(())
}

fn main() -> anyhow::Result<()> {
    // http://libharu.sourceforge.net/demo/text_demo.c
    let samp_text = "abcdefgABCDEFG123!#$%&+-@?";
    let samp_text2 = "The quick brown fox jumps over the lazy dog.";

    let doc = Document::new(|err| {
        println!("err={:?}", err);
    })?;

    /* set compression mode */
    doc.set_compression_mode(CompressionMode::ALL)?;

    /* create default-font */
    let font = doc.font("Helvetica", None)?;

    /* add a new page object */
    let page = doc.add_page()?;
    let page = PageDescriptionMode::new(&page);

    /* draw grid to the page */
    util::print_grid(&doc, &page)?;

    /* print the title of the page (with positioning center) */
    let page_title = "Text Demo";
    page.set_font_and_size(&font, 24.0)?;
    let tw = page.text_width(page_title)?;
    page.run_text_mode(|page|{
        page.text_out(((page.width()? - tw)/2.0, page.height()? - 50.0), page_title)?;
        Ok(())
    })?;

    page.run_text_mode(|page|{
        page.move_text_pos((60.0, page.height()? - 60.0))?;
    
        /* font size */
        let mut fsize = 8.0;
        while fsize < 60.0 {
            /* set style and size of font */
            page.set_font_and_size(&font, fsize)?;
    
            /* set the position of the text */
            page.move_text_pos((0.0, -5.0 - fsize))?;
    
            /* measure the number of characters which included in the page. */
            let (len, _real_width) = page.measure_text(samp_text, page.width()? - 120.0, false)?;
    
            /* truncate the text */
            let samp_text_truncated = &samp_text[..len];
    
            page.show_text(samp_text_truncated)?;
    
            /* print the description */
            page.move_text_pos((0.0, -10.0))?;
            page.set_font_and_size(&font, 8.0)?;
            page.show_text(&format!("Fontsize={}", fsize))?;
    
            fsize = fsize * 1.5;
        }
        
        /* font color */
        page.set_font_and_size(&font, 8.0)?;
        page.move_text_pos((0.0, -30.0))?;
        page.show_text("Font color")?;
    
        page.set_font_and_size(&font, 18.0)?;
        page.move_text_pos((0.0, -20.0))?;
        for (i, ch) in samp_text.chars().enumerate() {
            let r = (i as f32) / (samp_text.len() as f32);
            let g = 1.0 - ((i as f32) / (samp_text.len() as f32));
    
            page.set_rgb_fill((r, g, 0.0))?;
            page.show_text(&format!("{}", ch))?;
        }
        page.move_text_pos((0.0, -25.0))?;
    
        for (i, ch) in samp_text.chars().enumerate() {
            let r = (i as f32) / (samp_text.len() as f32);
            let b = 1.0 - ((i as f32) / (samp_text.len() as f32));
    
            page.set_rgb_fill((r, 0.0, b))?;
            page.show_text(&format!("{}", ch))?;
        }
        page.move_text_pos((0.0, -25.0))?;
    
        for (i, ch) in samp_text.chars().enumerate() {
            let b = (i as f32) / (samp_text.len() as f32);
            let g = 1.0 - ((i as f32) / (samp_text.len() as f32));
    
            page.set_rgb_fill((0.0, g, b))?;
            page.show_text(&format!("{}", ch))?;
        }
    
        Ok(())
    })?;

    let ypos = 450.0;

    /* Font rendering mode */
    page.set_font_and_size(&font, 32.0)?;
    page.set_rgb_fill((0.5, 0.5, 0.0))?;
    page.set_line_width(1.5)?;

    /* PDF_FILL */
    show_description(&page, 60.0, ypos, "RenderingMode=PDF_FILL")?;
    page.set_text_rendering_mode(TextRenderingMode::Fill)?;
    page.run_text_mode(|page| {
        page.text_out((60.0, ypos), "ABCabc123")?;
        Ok(())
    })?;

    /* PDF_STROKE */
    show_description(&page, 60.0, ypos - 50.0, "RenderingMode=PDF_STROKE")?;
    page.set_text_rendering_mode(TextRenderingMode::Stroke)?;
    page.run_text_mode(|page| {
        page.text_out((60.0, ypos - 50.0), "ABCabc123")?;
        Ok(())
    })?;

    /* PDF_FILL_THEN_STROKE */
    show_description(&page, 60.0, ypos - 100.0, "RenderingMode=PDF_FILL_THEN_STROKE")?;
    page.set_text_rendering_mode(TextRenderingMode::FillThenStroke)?;
    page.run_text_mode(|page| {
        page.text_out((60.0, ypos - 100.0), "ABCabc123")?;
        Ok(())
    })?;

    /* PDF_FILL_CLIPPING */
    show_description(&page, 60.0, ypos - 150.0, "RenderingMode=PDF_FILL_CLIPPING")?;
    page.gsave()?;
    page.set_text_rendering_mode(TextRenderingMode::FillClipping)?;
    page.run_text_mode(|page| {
        page.text_out((60.0, ypos - 150.0), "ABCabc123")?;
        Ok(())
    })?;
    show_stripe_pattern(&page, (60.0, ypos - 150.0))?;
    page.grestore()?;

    /* PDF_STROKE_CLIPPING */
    show_description(&page, 60.0, ypos - 200.0, "RenderingMode=PDF_STROKE_CLIPPING")?;
    page.gsave()?;
    page.set_text_rendering_mode(TextRenderingMode::StrokeClipping)?;
    page.run_text_mode(|page| {
        page.text_out((60.0, ypos - 200.0), "ABCabc123")?;
        Ok(())
    })?;
    show_stripe_pattern(&page, (60.0, ypos - 200.0))?;
    page.grestore()?;

    /* PDF_FILL_STROKE_CLIPPING */
    show_description(&page, 60.0, ypos - 250.0, "RenderingMode=PDF_FILL_STROKE_CLIPPING")?;
    page.gsave()?;
    page.set_text_rendering_mode(TextRenderingMode::FillStrokeClipping)?;
    page.run_text_mode(|page| {
        page.text_out((60.0, ypos - 250.0), "ABCabc123")?;
        Ok(())
    })?;
    show_stripe_pattern(&page, (60.0, ypos - 250.0))?;
    page.grestore()?;

    /* Reset text attributes */
    page.set_text_rendering_mode(TextRenderingMode::Fill)?;
    page.set_rgb_fill((0.0, 0.0, 0.0))?;
    page.set_font_and_size(&font, 30.0)?;

    /* Rotating text */
    let angle1 = 30.0; /* A rotation of 30 degrees. */
    let rad1: Real = angle1 / 180.0 * 3.141592; /* Calcurate the radian value. */

    show_description(&page, 320.0, ypos - 60.0, "Rotating text")?;
    page.run_text_mode(|page| {
        page.set_text_matrix(rad1.cos(), rad1.sin(), -rad1.sin(), rad1.cos(), 330.0, ypos - 60.0)?;
        page.show_text("ABCabc123")?;
        Ok(())
    })?;

    /* skewing text */
    let angle1 = 10.0;
    let angle2 = 20.0;
    let rad1: Real = angle1 / 180.0 * 3.141592;
    let rad2: Real = angle2 / 180.0 * 3.141592;
    show_description(&page, 320.0, ypos - 120.0, "Skewing text")?;
    page.run_text_mode(|page| {
        page.set_text_matrix(1.0, rad1.tan(), rad2.tan(), 1.0, 320.0, ypos - 120.0)?;
        page.show_text("ABCabc123")?;
        Ok(())
    })?;

    /* scaling text (X direction) */
    show_description(&page, 320.0, ypos - 175.0, "Scaling text (X direction)")?;
    page.run_text_mode(|page| {
        page.set_text_matrix(1.5, 0.0, 0.0, 1.0, 320.0, ypos - 175.0)?;
        page.show_text("ABCabc123")?;
        Ok(())
    })?;

    /* scaling text (Y direction) */
    show_description(&page, 320.0, ypos - 250.0, "Scaling text (Y direction)")?;
    page.run_text_mode(|page| {
        page.set_text_matrix(1.0, 0.0, 0.0, 2.0, 320.0, ypos - 250.0)?;
        page.show_text("ABCabc123")?;
        Ok(())
    })?;

    /* char spacing, word spacing */
    show_description(&page, 60.0, 140.0, "char-spacing 0")?;
    show_description(&page, 60.0, 100.0, "char-spacing 1.5")?;
    show_description(&page, 60.0, 60.0, "char-spacing 1.5, word-spacing 2.5")?;

    /* char-spacing 0 */
    page.run_text_mode(|page| {
        page.text_out((60.9, 140.0), samp_text2)?;
        Ok(())
    })?;

    /* char-spacing 1.5 */
    page.set_char_space(1.5)?;
    page.run_text_mode(|page| {
        page.text_out((60.0, 100.0), samp_text2)?;
        Ok(())
    })?;

    /* char-spacing 1.5, word-spacing 2.5 */
    page.set_word_space(2.5)?;
    page.run_text_mode(|page| {
        page.text_out((60.0, 60.0), samp_text2)?;
        Ok(())
    })?;

    /* save the document to a file */
    doc.save_to_file("text_demo.pdf")?;

    Ok(())
}