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#include "Utilities.hpp"
#include <numbers>
#include <godot_cpp/classes/resource_loader.hpp>
#include <godot_cpp/variant/utility_functions.hpp>
using namespace godot;
using namespace OpenVic;
Ref<Image> OpenVic::load_godot_image(String const& path) {
if (path.begins_with("res://")) {
ResourceLoader* loader = ResourceLoader::get_singleton();
return loader ? loader->load(path) : nullptr;
} else {
return Image::load_from_file(path);
}
}
// Get the polar coordinates of a pixel relative to the center
static Vector2 getPolar(Vector2 UVin, Vector2 center) {
Vector2 relcoord = (UVin - center);
float dist = relcoord.length();
float theta = std::numbers::pi / 2 + atan2(relcoord.y, relcoord.x);
if (theta < 0.0f) theta += std::numbers::pi * 2;
return { dist, theta };
}
// From thebookofshaders, returns a gradient falloff
static inline float parabola(float base, float x, float k) {
return powf(base * x * (1.0 - x), k);
}
static inline float parabola_shadow(float base, float x) {
return base * x * x;
}
static Color pie_chart_fragment(Vector2 UV, float radius, Array const& stopAngles, Array const& colours,
Vector2 shadow_displacement, float shadow_tightness, float shadow_radius, float shadow_thickness,
Color trim_colour, float trim_size, float gradient_falloff, float gradient_base,
bool donut, bool donut_inner_trim, float donut_inner_radius) {
Vector2 coords = getPolar(UV, { 0.5, 0.5 });
float dist = coords.x;
float theta = coords.y;
Vector2 shadow_polar = getPolar(UV, shadow_displacement);
float shadow_peak = radius + (radius - donut_inner_radius) / 2.0;
float shadow_gradient = shadow_thickness + parabola_shadow(shadow_tightness * -10.0, shadow_polar.x + shadow_peak - shadow_radius);
// Inner hole of the donut => make it transparent
if (donut && dist <= donut_inner_radius) {
return { 0.1, 0.1, 0.1, shadow_gradient };
}
// Inner trim
else if (donut && donut_inner_trim && dist <= donut_inner_radius + trim_size) {
return { trim_colour, 1.0 };
}
// Interior
else if (dist <= radius - trim_size) {
Color col { 1.0f, 0.0f, 0.0f };
for (int i = 0; i < stopAngles.size(); i++) {
if (theta <= float(stopAngles[i])) {
col = colours[i];
break;
}
}
float gradient = parabola(gradient_base, dist, gradient_falloff);
return { col * (1.0 - gradient), 1.0 };
}
// Outer trim
else if (dist <= radius) {
return { trim_colour, 1.0 };
}
// Outside the circle
else {
return { 0.1, 0.1, 0.1, shadow_gradient };
}
}
void OpenVic::draw_pie_chart(Ref<Image> image,
Array const& stopAngles, Array const& colours, float radius,
Vector2 shadow_displacement, float shadow_tightness, float shadow_radius, float shadow_thickness,
Color trim_colour, float trim_size, float gradient_falloff, float gradient_base,
bool donut, bool donut_inner_trim, float donut_inner_radius) {
ERR_FAIL_NULL_EDMSG(image, "Cannot draw pie chart to null image.");
const int32_t width = image->get_width();
const int32_t height = image->get_height();
ERR_FAIL_COND_EDMSG(width <= 0 || height <= 0, "Cannot draw pie chart to empty image.");
if (width != height) {
UtilityFunctions::push_warning("Drawing pie chart to non-square image: ", width, "x", height);
}
const int32_t size = std::min(width, height);
for (int32_t y = 0; y < size; ++y) {
for (int32_t x = 0; x < size; ++x) {
image->set_pixel(x, y, pie_chart_fragment(
{ static_cast<float>(x) / static_cast<float>(size),
static_cast<float>(y) / static_cast<float>(size) },
radius, stopAngles, colours,
shadow_displacement, shadow_tightness, shadow_radius, shadow_thickness,
trim_colour, trim_size, gradient_falloff, gradient_base,
donut, donut_inner_trim, donut_inner_radius));
}
}
}
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zaaarf