RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-27 02:27:43 +00:00
Code Issues Activity Actions

Starfield: Support variable speed

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

13
Userland/Demos/Starfield/Starfield.cpp
View file

@ -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();