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#include "GFXPieChartTexture.hpp"
#include <numbers>
#include "openvic-extension/utility/ClassBindings.hpp"
#include "openvic-extension/utility/UITools.hpp"
using namespace godot;
using namespace OpenVic;
using OpenVic::Utilities::std_view_to_godot_string;
StringName const& GFXPieChartTexture::_slice_identifier_key() {
static StringName const slice_identifier_key = "identifier";
return slice_identifier_key;
}
StringName const& GFXPieChartTexture::_slice_colour_key() {
static StringName const slice_colour_key = "colour";
return slice_colour_key;
}
StringName const& GFXPieChartTexture::_slice_weight_key() {
static StringName const slice_weight_key = "weight";
return slice_weight_key;
}
static constexpr float TWO_PI = 2.0f * std::numbers::pi_v<float>;
Error GFXPieChartTexture::_generate_pie_chart_image() {
ERR_FAIL_NULL_V(gfx_pie_chart, FAILED);
ERR_FAIL_COND_V_MSG(
gfx_pie_chart->get_size() <= 0, FAILED,
vformat("Invalid GFX::PieChart size for GFXPieChartTexture - %d", gfx_pie_chart->get_size())
);
const int32_t pie_chart_size = 2 * gfx_pie_chart->get_size();
/* Whether we've already set the ImageTexture to an image of the right dimensions,
* and so can update it without creating and setting a new image, or not. */
const bool can_update = pie_chart_image.is_valid() && pie_chart_image->get_width() == pie_chart_size
&& pie_chart_image->get_height() == pie_chart_size;
if (!can_update) {
pie_chart_image = Image::create(pie_chart_size, pie_chart_size, false, Image::FORMAT_RGBA8);
ERR_FAIL_NULL_V(pie_chart_image, FAILED);
}
static const Color background_colour { 0.0f, 0.0f, 0.0f, 0.0f };
if (!slices.empty()) {
const float pie_chart_radius = gfx_pie_chart->get_size();
const Vector2 centre_translation = Vector2 { 0.5f, 0.5f } - static_cast<Vector2>(pie_chart_image->get_size()) * 0.5f;
for (Vector2i point { 0, 0 }; point.y < pie_chart_image->get_height(); ++point.y) {
for (point.x = 0; point.x < pie_chart_image->get_width(); ++point.x) {
const Vector2 offset = centre_translation + point;
if (offset.length() <= pie_chart_radius) {
/* Calculate the anti-clockwise angle between the point and the centre of the image.
* The y coordinate is negated as the image coordinate system's y increases downwards. */
float theta = atan2(-offset.y, offset.x);
if (theta < 0.0f) {
theta += TWO_PI;
}
/* Rescale angle so that total_weight is a full rotation. */
theta *= total_weight / TWO_PI;
/* Default to the first colour in case theta never reaches 0 due to floating point inaccuracy. */
Color colour = slices.front().first;
/* Find the slice theta lies in. */
for (slice_t const& slice : slices) {
theta -= slice.second;
if (theta <= 0.0f) {
colour = slice.first;
break;
}
}
pie_chart_image->set_pixelv(point, colour);
} else {
pie_chart_image->set_pixelv(point, background_colour);
}
}
}
} else {
pie_chart_image->fill(background_colour);
}
if (can_update) {
update(pie_chart_image);
} else {
set_image(pie_chart_image);
}
return OK;
}
Error GFXPieChartTexture::set_slices_array(godot_pie_chart_data_t const& new_slices) {
slices.clear();
total_weight = 0.0f;
for (int32_t i = 0; i < new_slices.size(); ++i) {
Dictionary const& slice_dict = new_slices[i];
ERR_CONTINUE_MSG(
!slice_dict.has(_slice_colour_key()) || !slice_dict.has(_slice_weight_key()), vformat("Invalid slice keys at index %d", i)
);
const slice_t slice = std::make_pair(slice_dict[_slice_colour_key()], slice_dict[_slice_weight_key()]);
if (slice.second > 0.0f) {
total_weight += slice.second;
slices.push_back(slice);
}
}
return _generate_pie_chart_image();
}
void GFXPieChartTexture::_bind_methods() {
OV_BIND_METHOD(GFXPieChartTexture::clear);
OV_BIND_METHOD(GFXPieChartTexture::set_gfx_pie_chart_name, { "gfx_pie_chart_name" });
OV_BIND_METHOD(GFXPieChartTexture::get_gfx_pie_chart_name);
OV_BIND_METHOD(GFXPieChartTexture::set_slices_array, { "new_slices" });
}
GFXPieChartTexture::GFXPieChartTexture() : gfx_pie_chart { nullptr }, total_weight { 0.0f } {}
Ref<GFXPieChartTexture> GFXPieChartTexture::make_gfx_pie_chart_texture(GFX::PieChart const* gfx_pie_chart) {
Ref<GFXPieChartTexture> pie_chart_texture;
pie_chart_texture.instantiate();
ERR_FAIL_NULL_V(pie_chart_texture, nullptr);
ERR_FAIL_COND_V(pie_chart_texture->set_gfx_pie_chart(gfx_pie_chart) != OK, nullptr);
return pie_chart_texture;
}
void GFXPieChartTexture::clear() {
gfx_pie_chart = nullptr;
slices.clear();
total_weight = 0.0f;
pie_chart_image.unref();
}
Error GFXPieChartTexture::set_gfx_pie_chart(GFX::PieChart const* new_gfx_pie_chart) {
if (gfx_pie_chart == new_gfx_pie_chart) {
return OK;
}
if (new_gfx_pie_chart == nullptr) {
clear();
return OK;
}
gfx_pie_chart = new_gfx_pie_chart;
return _generate_pie_chart_image();
}
Error GFXPieChartTexture::set_gfx_pie_chart_name(String const& gfx_pie_chart_name) {
if (gfx_pie_chart_name.is_empty()) {
return set_gfx_pie_chart(nullptr);
}
GFX::Sprite const* sprite = UITools::get_gfx_sprite(gfx_pie_chart_name);
ERR_FAIL_NULL_V(sprite, FAILED);
GFX::PieChart const* new_pie_chart = sprite->cast_to<GFX::PieChart>();
ERR_FAIL_NULL_V_MSG(
new_pie_chart, FAILED, vformat(
"Invalid type for GFX sprite %s: %s (expected %s)", gfx_pie_chart_name,
std_view_to_godot_string(sprite->get_type()), std_view_to_godot_string(GFX::PieChart::get_type_static())
)
);
return set_gfx_pie_chart(new_pie_chart);
}
String GFXPieChartTexture::get_gfx_pie_chart_name() const {
return gfx_pie_chart != nullptr ? std_view_to_godot_string(gfx_pie_chart->get_name()) : String {};
}
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