絵文字を含むテキストを文字単位で自由描画する

https://gyazo.com/fb4dce1f504959e1af6bc682f75730d7

code:draw_glyphs.cpp

# include <Siv3D.hpp> // OpenSiv3D v0.6.11

class GlyphsDrawer

{

Font& font_;

Font& emojiFont_;

// 絵文字とみなす文字

const String emojiList_ = U"🐣🐈🐶";

public:

GlyphsDrawer(Font& font, Font& emojiFont)

: font_(font)

, emojiFont_(emojiFont)

{

}

RectF region(StringView text) const

{

Vec2 charPos{ 0, 0 };

Array<Vec2> points;

{

const Glyph* glyph = &g;

Glyph glyphEmoji;

if (emojiList_.includes(g.codePoint))

{

glyphEmoji = emojiFont_.getGlyph(g.codePoint);

glyph = &glyphEmoji;

}

const auto rect = RectF{ charPos + glyph->getOffset(), glyph->texture.size };

points.push_back(rect.tl());

points.push_back(rect.br());

charPos.x += glyph->xAdvance;

}

return Geometry2D::BoundingRect(points);

}

void draw(StringView text, const Vec2& pos) const

{

Vec2 charPos = pos;

{

const Glyph* glyph = &g;

Glyph glyphEmoji;

if (emojiList_.includes(g.codePoint))

{

glyphEmoji = emojiFont_.getGlyph(g.codePoint);

glyph = &glyphEmoji;

}

const double t = Scene::Time() - index * 0.04;

const double alpha = Clamp(t * 8, 0.0, 1.0);

const double offsetY = (1 - Clamp(t * 20, 0.0, 1.0)) * 16;

glyph->texture.draw(Math::Round(charPos + glyph->getOffset() + Vec2(0, offsetY)), AlphaF(alpha));

charPos.x += glyph->xAdvance;

}

}

};

void Main()

{

Scene::SetBackground(ColorF{ 0.2, 0.2, 0.2 });

Font font{ 32, Typeface::Bold };

Font emojiFont{ 32, Typeface::MonochromeEmoji };

GlyphsDrawer glyphsDrawer{ font, emojiFont };

while (System::Update())

{

const String text = U"'o') < This text includes emojis 🐣🐈🐶 !";

const auto region = glyphsDrawer.region(text);

const Vec2 textPos = Scene::CenterF() - Vec2(region.w / 2, 0);

//region.movedBy(textPos).drawFrame(1.0, Palette::Lime);

glyphsDrawer.draw(text, textPos);

}

}