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Starfield: Support variable speed

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This change allows us to modify the speed in which the Starfield is
generated. Increasing the speed also increases the length of each trail.
This commit is contained in:
Pedro Pereira 2021-11-21 10:38:56 +00:00 • committed by Linus Groh
parent d5c687b50f
commit 6ac97d4397
1 changed files with 11 additions and 2 deletions
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13
Userland/Demos/Starfield/Starfield.cpp
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@ -47,6 +47,7 @@ private:
Vector<Coordinate> m_stars;
int m_sweep_plane = 2000;
unsigned m_speed = 1;
};
Starfield::Starfield(int interval)
@ -102,18 +103,26 @@ void Starfield::timer_event(Core::TimerEvent&)
auto half_x = width() / 2;
auto half_y = height() / 2;
GUI::Painter painter(*m_bitmap);
for (auto star : m_stars) {
auto z = ((star.z + m_sweep_plane) % 2000) * 0.0005;
computed_point.set_x(half_x + star.x / z);
computed_point.set_y(half_y + star.y / z);
auto computed_end_point = Gfx::IntPoint();
auto z_end = ((star.z + m_sweep_plane - m_speed) % 2000) * 0.0005;
computed_end_point.set_x(half_x + star.x / z_end);
computed_end_point.set_y(half_y + star.y / z_end);
if (computed_point.x() < 0 || computed_point.x() >= width() || computed_point.y() < 0 || computed_point.y() >= height())
continue;
u8 falloff = (1 - z * z) * 255;
m_bitmap->set_pixel(computed_point, Color(falloff, falloff, falloff));
painter.draw_line(computed_point, computed_end_point, Color(falloff, falloff, falloff));
}
m_sweep_plane -= 1;
m_sweep_plane -= m_speed;
if (m_sweep_plane < 0)
m_sweep_plane = 2000;
update();