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author Hop311 <Hop3114@gmail.com>2024-08-30 23:30:12 +0200
committer GitHub <noreply@github.com>2024-08-30 23:30:12 +0200
commit2e0bc5b556b9c6df46a8cdd48d3f109e0ac76b63 (patch)
tree2c521b99fe6cd0a7fd5d6a29e55645b3415792b3 /extension/src/openvic-extension/classes/GFXPieChartTexture.cpp
parentf54e454afb90f8868e7c62529e2a388fdaadf20b (diff)
parentbdc2ba527bc02e7cdf977f6040f2ca85aa4f9a94 (diff)
Merge pull request #253 from OpenVicProject/tooltip
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Diffstat (limited to 'extension/src/openvic-extension/classes/GFXPieChartTexture.cpp')
-rw-r--r--extension/src/openvic-extension/classes/GFXPieChartTexture.cpp97
1 files changed, 53 insertions, 44 deletions
diff --git a/extension/src/openvic-extension/classes/GFXPieChartTexture.cpp b/extension/src/openvic-extension/classes/GFXPieChartTexture.cpp
index 417566d..5d955a3 100644
--- a/extension/src/openvic-extension/classes/GFXPieChartTexture.cpp
+++ b/extension/src/openvic-extension/classes/GFXPieChartTexture.cpp
@@ -7,6 +7,7 @@
using namespace godot;
using namespace OpenVic;
+using namespace OpenVic::Utilities::literals;
StringName const& GFXPieChartTexture::_slice_identifier_key() {
static const StringName slice_identifier_key = "identifier";
@@ -21,7 +22,35 @@ StringName const& GFXPieChartTexture::_slice_weight_key() {
return slice_weight_key;
}
-static constexpr float TWO_PI = 2.0f * std::numbers::pi_v<float>;
+GFXPieChartTexture::slice_t const* GFXPieChartTexture::get_slice(Vector2 const& position) const {
+ if (slices.empty() || position.length_squared() > 1.0_real) {
+ return nullptr;
+ }
+
+ static constexpr float TWO_PI = 2.0f * std::numbers::pi_v<float>;
+
+ /* 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(-position.y, position.x);
+ if (theta < 0.0f) {
+ theta += TWO_PI;
+ }
+
+ /* Rescale angle so that total_weight is a full rotation. */
+ theta *= total_weight / TWO_PI;
+
+ /* Find the slice theta lies in. */
+ for (slice_t const& slice : slices) {
+ theta -= slice.weight;
+
+ if (theta <= 0.0f) {
+ return &slice;
+ }
+ }
+
+ /* Default to the first slice in case theta never reaches 0 due to floating point inaccuracy. */
+ return &slices.front();
+}
Error GFXPieChartTexture::_generate_pie_chart_image() {
ERR_FAIL_NULL_V(gfx_pie_chart, FAILED);
@@ -30,60 +59,37 @@ Error GFXPieChartTexture::_generate_pie_chart_image() {
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();
+ const int32_t pie_chart_radius = gfx_pie_chart->get_size();
+ const int32_t pie_chart_diameter = 2 * pie_chart_radius;
/* 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;
+ const bool can_update = pie_chart_image.is_valid() && pie_chart_image->get_width() == pie_chart_diameter
+ && pie_chart_image->get_height() == pie_chart_diameter;
if (!can_update) {
- pie_chart_image = Image::create(pie_chart_size, pie_chart_size, false, Image::FORMAT_RGBA8);
+ pie_chart_image = Image::create(pie_chart_diameter, pie_chart_diameter, 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;
+ for (Vector2i point { 0, 0 }; point.y < pie_chart_diameter; ++point.y) {
- /* Default to the first colour in case theta never reaches 0 due to floating point inaccuracy. */
- Color colour = slices.front().first;
+ for (point.x = 0; point.x < pie_chart_diameter; ++point.x) {
- /* Find the slice theta lies in. */
- for (slice_t const& slice : slices) {
- theta -= slice.second;
+ Vector2 offset = point;
+ // Move to the centre of the pixel
+ offset += Vector2 { 0.5_real, 0.5_real };
+ // Normalise to [0, 2]
+ offset /= pie_chart_radius;
+ // Translate to [-1, 1]
+ offset -= Vector2 { 1.0_real, 1.0_real };
- if (theta <= 0.0f) {
- colour = slice.first;
- break;
- }
- }
+ slice_t const* slice = get_slice(offset);
- pie_chart_image->set_pixelv(point, colour);
- } else {
- pie_chart_image->set_pixelv(point, background_colour);
- }
+ pie_chart_image->set_pixelv(point, slice != nullptr ? slice->colour : background_colour);
}
}
} else {
@@ -107,12 +113,15 @@ Error GFXPieChartTexture::set_slices_array(godot_pie_chart_data_t const& new_sli
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()),
+ !slice_dict.has(_slice_identifier_key()) || !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;
+ const slice_t slice {
+ slice_dict[_slice_identifier_key()], slice_dict[_slice_colour_key()], slice_dict[_slice_weight_key()]
+ };
+ if (slice.weight > 0.0f) {
+ total_weight += slice.weight;
slices.push_back(slice);
}
}