ニコニコ生放送にて、30分で作ったお絵かきソフト

Main.cpp

//お絵かきソフト

# include <Siv3D.hpp>

void Main()
{
    Window::Resize({ 640, 640 });

    Graphics::SetBackground(Palette::Gray);

    Image image{ 640, 480, Palette::White };

    DynamicTexture texture{ image };

    const std::array<Color, 16> colors =
    {
        Palette::Black,
        Palette::Gray,
        Palette::Silver,
        Palette::White,
        Palette::Maroon,
        Palette::Red,
        Palette::Olive,
        Palette::Yellow,
        Palette::Green,
        Palette::Lime,
        Palette::Teal,
        Palette::Aqua,
        Palette::Navy,
        Palette::Blue,
        Palette::Purple,
        Palette::Fuchsia
    };

    std::array<Rect, 16> buttons;

    const Point areaSize{ 80, 80 };

    const Point margin{ 5, 5 };

    const Point buttonSize = areaSize - margin * 2;

    const Point firstPos = Point(0, 480) + areaSize / 2;

    for (int i = 0; i < buttons.size(); ++i)
    {
        buttons[i].setSize(buttonSize);

        buttons[i].setCenter(firstPos + Point((i % 8) * areaSize.x, (i / 8) * areaSize.y));
    }

    Color penColor;


    while (System::Update())
    {
        for (int i = 0; i < buttons.size(); ++i)
        {
            if (buttons[i].leftClicked)
            {
                penColor = colors[i];
            }
        }

        if (Input::MouseL.pressed)
        {
            const Point pos = Input::MouseL.clicked ? Mouse::Pos() : Mouse::PreviousPos();

            Line{ pos, Mouse::Pos() }.write(image, 8, penColor);

            texture.fill(image);
        }

        texture.draw();

        for (int i = 0; i < buttons.size(); ++i)
        {
            buttons[i].draw(colors[i]);

            buttons[i].drawFrame(1.0, 1.0, Palette::White);
        }
    }
}