beenull/ladybird
1
0
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2024-11-26 09:30:24 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 7

Mandelbrot: Implement color smoothing with gradients

Browse source 
This removes the color banding that happens for some of the
"outer" areas which all have the same iteration count.
This commit is contained in:
Gunnar Beutner 2021-05-17 17:01:05 +02:00 committed by Andreas Kling
parent c961616e6d
commit b429ee88f8
Notes: sideshowbarker 2024-07-18 17:52:12 +09:00 
Author: https://github.com/gunnarbeutner
Commit: https://github.com/SerenityOS/serenity/commit/b429ee88f8a
Pull-request: https://github.com/SerenityOS/serenity/pull/7214
Reviewed-by: https://github.com/bgianfo ✅
1 changed files with 20 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
Userland/Demos/Mandelbrot/Mandelbrot.cpp
View file

@ -45,7 +45,7 @@ public:
calculate();
}
i32 mandelbrot(double px, double py, i32 max_iterations)
double mandelbrot(double px, double py, i32 max_iterations)
{
// Based on https://en.wikipedia.org/wiki/Plotting_algorithms_for_the_Mandelbrot_set
const double x0 = px * (m_x_end - m_x_start) / m_bitmap->width() + m_x_start;
@ -64,15 +64,30 @@ public:
iteration++;
}
return iteration;
if (iteration == max_iterations)
return iteration;
auto lz = sqrt(x * x + y * y) / 2;
return 1 + iteration + log(lz / log(2)) / log(2);
}
static double linear_interpolate(double v0, double v1, double t)
{
return v0 + t * (v1 - v0);
}
void calculate_pixel(int px, int py, int max_iterations)
{
auto iterations = mandelbrot(px, py, max_iterations);
double hue = (double)iterations * 360.0 / (double)max_iterations;
if (hue == 360.0)
hue = 0.0;
auto whole_iterations = floor(iterations);
auto partial_iterations = fmod(iterations, 1);
double hue1 = whole_iterations * 360.0 / max_iterations;
if (hue1 >= 360.0)
hue1 = 0.0;
double hue2 = (whole_iterations + 1) * 360.0 / max_iterations;
if (hue2 >= 360.0)
hue2 = 0.0;
double hue = linear_interpolate(hue1, hue2, partial_iterations);
double saturation = 1.0;
double value = iterations < max_iterations ? 1.0 : 0;
m_bitmap->set_pixel(px, py, Color::from_hsv(hue, saturation, value));