(旧Siv3D) 引き出し線を描く

https://gyazo.com/386b69c379ea9e910965131121ef4ae0

code:leadline.cpp

enum class LeadLineTextHAlign

{

Left,

Right,

};

enum class LeadLineTextVAlign

{

Top,

Middle,

Bottom,

};

void drawLeadLine(const Vec2& from, const Circular& lead1, const double lead2, const String text, const LeadLineTextHAlign halign, const LeadLineTextVAlign valign, const Font& font)

{

const Vec2 p1 = from;

const Vec2 p2 = p1 + lead1;

const Vec2 p3 = p2 + Circular(lead2, halign == LeadLineTextHAlign::Left ? 270_deg : 90_deg);

const Rect region = font(text).region();

Vec2 pText;

pText.x = halign == LeadLineTextHAlign::Left ? p3.x : p3.x - region.w;

switch (valign)

{

case LeadLineTextVAlign::Top: pText.y = p3.y - region.h; break;

case LeadLineTextVAlign::Middle: pText.y = p3.y - region.h / 2; break;

case LeadLineTextVAlign::Bottom: pText.y = p3.y; break;

}

Line(p1, p2).draw(Palette::White);

Line(p2, p3).draw(Palette::White);

font(text).draw(pText, Palette::White);

}

void Main()

{

Graphics::SetBackground(Palette::Black);

const Font font(12);

while (System::Update())

{

Circle(Window::Center(), 50.0).draw(Palette::Darkorange);

drawLeadLine(Window::Center(), Circular(100.0, 60_deg), 150.0, L"引き出し線", LeadLineTextHAlign::Right, LeadLineTextVAlign::Top, font);

drawLeadLine(Window::Center() + Circular(50.0, -45_deg), Circular(100.0, -45_deg), 150.0, L"左にも引ける", LeadLineTextHAlign::Left, LeadLineTextVAlign::Top, font);

}

}