typography.cpp - master - SilovAndrey/easel_examples

typography.cpp
179 строк5 KB
Arch Hipper
to homepc
15 июл 2026, 06:36
15 июл 2026, 06:36231b8b3
module;

#include <string>
#include <filesystem>
#include <thorvg.h>

module App;

using namespace easel;
using namespace FontConstants;
auto constexpr window_size = point{640.0f, 480.0f};
auto constexpr bkd_color = rgb(44, 42, 45);

void background(canvas& cnv)
{
   cnv.fill_style(bkd_color);
   cnv.fill(path_rect({{0, 0}, window_size }));
}

void typography(canvas& cnv)
{
   background(cnv);

   cnv.fill_style(rgba(220, 220, 220, 200));
   cnv.stroke_style(rgba(220, 220, 220, 200));

   // Regular
   cnv.font(FontDescr{"Open Sans", 36});
   cnv.fill_text("Regular", {20, 40});

   // Bold
   cnv.font(FontDescr{"Open Sans", 36}.bold());
   cnv.fill_text("Bold", {160, 40});

   // Light
   cnv.font(FontDescr{"Open Sans", 36}.light());
   cnv.fill_text("Light", {250, 40});

   // Italic
   cnv.font(FontDescr{"Open Sans", 36}.italic());
   cnv.fill_text("Italic", {345, 40});

   // Condensed
   cnv.font(FontDescr{"Open Sans Condensed, Open Sans", 36}.condensed());
   cnv.fill_text("Condensed", 430, 40);

   // Condensed Italic
   cnv.font(FontDescr{"Open Sans Condensed, Open Sans", 36}.italic().condensed().light());
   cnv.fill_text("Condensed Italic", 20, 115);

   // In the last two cases, the font family 'Open Sans Condensed' already
   // describes the font as condensed, but we still add the font family 'Open
   // Sans' and styles because, depending on platform, the font family 'Open
   // Sans Condensed' is either grouped into the 'Open Sans' family (e.g.
   // Windows), or separate as a distinct family (e.g. MacOS).

   // Outline
   cnv.font(FontDescr{"Open Sans", 36}.bold());
   cnv.line_width(0.5);
   cnv.stroke_text("Outline", {210, 115});

   cnv.font(FontDescr{"Open Sans", 52}.bold());
   // Gradient Fill
   {
      auto gr = canvas::linear_gradient{{360, 90}, {360, 140}};
      gr.add_color_stop(0.0, colors::navy_blue);
      gr.add_color_stop(1.0, colors::maroon);
      cnv.fill_style(gr);
      cnv.fill_text("Gradient", {360, 115});
      cnv.stroke_text("Gradient", {360, 115});
   }

   // Outline Gradient Fill
   {
      auto gr = canvas::linear_gradient{{360, 165}, {360, 215}};
      gr.add_color_stop(0.0, colors::medium_blue);
      gr.add_color_stop(1.0, colors::medium_violet_red);
      cnv.line_width(1.5);
      cnv.stroke_style(gr);
      cnv.stroke_text("Outline Gradient", {20, 190});
   }

// #if defined(ARTIST_QUARTZ_2D) // CoreText supports ligatures right out of the box, but only for some fonts
//    cnv.font(FontDescr{"Lucida Grande", 52}.bold());
// #else
   cnv.font(FontDescr{"Open Sans", 52}.bold());
//#endif
   cnv.fill_style(rgba(220, 220, 220, 200));
   cnv.fill_text("fi fl", 500, 190);

   cnv.font(FontDescr{"Open Sans", 52}.weight(Weight::semi_bold));
   {
      auto state = cnv.new_state();

      // Shadow
      cnv.fill_style(rgba(220, 220, 220, 200));
      //cnv.shadow_style({5.0, 5.0}, 5, colors::black);
      cnv.fill_text("Shadow", {20, 265});

      // Glow
      cnv.fill_style(bkd_color);
      //cnv.shadow_style(8, colors::light_sky_blue);
      cnv.fill_text("Glow", {250, 265});
   }

    Path p;
   p.move_to({500, 220});
   p.line_to({500, 480});
   cnv.stroke_style(colors::red);
   cnv.line_width(0.5);
   cnv.stroke(p);

   cnv.fill_style(rgba(220, 220, 220, 200));
   cnv.font(FontDescr{"Open Sans", 14});

   char const* align_text[] = {
      "text_align(left)",
      "text_align(right)",
      "text_align(center)",
      "text_align(baseline)",
      "text_align(top)",
      "text_align(middle)",
      "text_align(bottom)"
   };

   int aligns[] = {
      cnv.left,
      cnv.right,
      cnv.center,
      cnv.baseline,
      cnv.top,
      cnv.middle,
      cnv.bottom
   };

   float vspace = 35;
   float vstart = 250-vspace;
   for (int i = 0; i != 7; ++i)
   {
      vstart += vspace;
      // cnv.move_to({400, vstart});
      // cnv.line_to({600, vstart});
      // cnv.stroke();
      cnv.text_align(aligns[i]);
      cnv.fill_text(align_text[i], {500, vstart});
   }

   std::string text =
      "Although I am a typical loner in daily life, my consciousness of "
      "belonging to the invisible community of those who strive for "
      "truth, beauty, and justice has preserved me from feeling isolated.\n\n"

      "The years of anxious searching in the dark, with their intense "
      "longing, their alternations of confidence and exhaustion, and "
      "final emergence into light—only those who have experienced it "
      "can understand that.\n\n"

      "⁠—Albert Einstein"
      ;

   // auto tlayout = text_layout{
   //    FontDescr{"Open Sans", 12}.italic()
   //  , text
   // };
   // tlayout.flow(350, true);
   // tlayout.draw(cnv, {20, 300}, rgba(220, 220, 220, 200));
}

void draw(canvas& cnv, int w, int h)
{
   typography(cnv);
}

int start(int argc, char const* argv[])
{
    namespace fs = std::filesystem;
    add_font_path(fs::current_path() / "resources/fonts");
    return run_app(argc, argv, window_size);
}