キャラの少し前の方を2Dカメラで追従する

https://gyazo.com/b2e57627d98311efc31c021446e90e47

code:camera.cpp

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

class Siv3dkun

{

const int SpriteWidth = 20;

const int SpriteHeight = 28;

Texture m_texture;

Vec2 m_pos;

Vec2 m_speed;

double m_timeChangeSpeed;

Vec2 m_cameraTarget;

public:

Siv3dkun()

: m_texture(U"example/spritesheet/siv3d-kun-16.png")

, m_pos(Scene::Center())

, m_speed(30.0, 0)

, m_timeChangeSpeed(1.0)

, m_cameraTarget()

{

}

void update()

{

if (Scene::Time() > m_timeChangeSpeed)

{

m_speed.x = Math::Sign(m_speed.x) * (-1) * Random(40, 300);

m_timeChangeSpeed += Random(1.0, 3.0);

}

m_pos += m_speed * Scene::DeltaTime();

m_cameraTarget.x = Clamp(m_cameraTarget.x + Math::Sign(m_speed.x) * 120 * Scene::DeltaTime(), -60.0, 60.0);

}

void draw() const

{

const auto renderState = ScopedRenderStates2D{ SamplerState::ClampNearest };

const int animationFrame = (m_speed.x < 0 ? 6 : 12) + (int)(Periodic::Triangle0_1(0.5s) * 2.0 + 0.5);

m_texture((animationFrame % 6) * SpriteWidth, (animationFrame / 6) * SpriteHeight, SpriteWidth, SpriteHeight)

.scaled(8)

.drawAt(m_pos);

}

const Vec2& position() const

{

return m_pos;

}

Vec2 cameraTargetPosition() const

{

return m_pos + m_cameraTarget;

}

};

void Main()

{

Scene::SetBackground(ColorF{ 0, 0, 0 });

Siv3dkun siv3dkun;

Camera2D camera{ Scene::Center() };

Image bgImage{ 256, 256, ColorF{ 0.6, 0.6, 0.6 } };

Rect(0, 0, 128).overwrite(bgImage, ColorF{ 0.8, 0.8, 0.8 });

Rect(128, 128, 128).overwrite(bgImage, ColorF{ 0.8, 0.8, 0.8 });

const Texture bgTexture{ bgImage };

while (System::Update())

{

siv3dkun.update();

camera.jumpTo(siv3dkun.cameraTargetPosition(), 1.0);

//camera.update();

{

const auto transformer = camera.createTransformer();

// 背景

{

const ScopedRenderStates2D sampler{ SamplerState::RepeatLinear };

bgTexture.mapped(1920, Scene::Height()).draw(-1920 / 2, 0);

}

siv3dkun.draw();

}

}

}