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Merge pull request #85080 from Cykyrios/draw-ellipse

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Add methods to draw ellipses
This commit is contained in:
Thaddeus Crews
2025-09-23 12:08:51 -05:00
parent 75f0f3dc55 9f7c3d00dd
commit c62356fcaa
9 changed files with 114 additions and 40 deletions
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62
servers/rendering/renderer_canvas_cull.cpp
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@@ -1429,56 +1429,56 @@ void RendererCanvasCull::canvas_item_add_rect(RID p_item, const Rect2 &p_rect, c
}
}
void RendererCanvasCull::canvas_item_add_circle(RID p_item, const Point2 &p_pos, float p_radius, const Color &p_color, bool p_antialiased) {
void RendererCanvasCull::canvas_item_add_ellipse(RID p_item, const Point2 &p_pos, float p_major, float p_minor, const Color &p_color, bool p_antialiased) {
Item *canvas_item = canvas_item_owner.get_or_null(p_item);
ERR_FAIL_NULL(canvas_item);
static const int circle_segments = 64;
static const int ellipse_segments = 64;
{
Item::CommandPolygon *circle = canvas_item->alloc_command<Item::CommandPolygon>();
ERR_FAIL_NULL(circle);
Item::CommandPolygon *ellipse = canvas_item->alloc_command<Item::CommandPolygon>();
ERR_FAIL_NULL(ellipse);
circle->primitive = RS::PRIMITIVE_TRIANGLES;
ellipse->primitive = RS::PRIMITIVE_TRIANGLES;
Vector<int> indices;
Vector<Vector2> points;
points.resize(circle_segments + 2);
points.resize(ellipse_segments + 2);
Vector2 *points_ptr = points.ptrw();
// Store circle center in the last point.
points_ptr[circle_segments + 1] = p_pos;
// Store ellipse center in the last point.
points_ptr[ellipse_segments + 1] = p_pos;
const real_t circle_point_step = Math::TAU / circle_segments;
const real_t ellipse_point_step = Math::TAU / ellipse_segments;
for (int i = 0; i < circle_segments + 1; i++) {
float angle = i * circle_point_step;
points_ptr[i].x = Math::cos(angle) * p_radius;
points_ptr[i].y = Math::sin(angle) * p_radius;
for (int i = 0; i < ellipse_segments + 1; i++) {
float angle = i * ellipse_point_step;
points_ptr[i].x = Math::cos(angle) * p_major;
points_ptr[i].y = Math::sin(angle) * p_minor;
points_ptr[i] += p_pos;
}
indices.resize(circle_segments * 3);
indices.resize(ellipse_segments * 3);
int *indices_ptr = indices.ptrw();
for (int i = 0; i < circle_segments; i++) {
indices_ptr[i * 3 + 0] = circle_segments + 1;
for (int i = 0; i < ellipse_segments; i++) {
indices_ptr[i * 3 + 0] = ellipse_segments + 1;
indices_ptr[i * 3 + 1] = i;
indices_ptr[i * 3 + 2] = i + 1;
}
Vector<Color> color;
color.push_back(p_color);
circle->polygon.create(indices, points, color);
ellipse->polygon.create(indices, points, color);
}
if (p_antialiased) {
float border_size = FEATHER_SIZE;
const float diameter = p_radius * 2.0f;
if (0.0f <= diameter && diameter < 1.0f) {
border_size *= p_radius;
const float max_axis = fmax(p_major, p_minor) * 2.0f;
if (0.0f <= max_axis && max_axis < 1.0f) {
border_size *= max_axis * 0.5f;
}
Item::CommandPolygon *feather = canvas_item->alloc_command<Item::CommandPolygon>();
@@ -1491,25 +1491,25 @@ void RendererCanvasCull::canvas_item_add_circle(RID p_item, const Point2 &p_pos,
Vector<Color> colors;
Vector<Vector2> points;
points.resize(2 * circle_segments + 2);
colors.resize(2 * circle_segments + 2);
points.resize(2 * ellipse_segments + 2);
colors.resize(2 * ellipse_segments + 2);
const real_t circle_point_step = Math::TAU / circle_segments;
const real_t ellipse_point_step = Math::TAU / ellipse_segments;
Vector2 *points_ptr = points.ptrw();
Color *colors_ptr = colors.ptrw();
for (int i = 0; i < circle_segments + 1; i++) {
const float angle = i * circle_point_step;
for (int i = 0; i < ellipse_segments + 1; i++) {
const float angle = i * ellipse_point_step;
const float c = Math::cos(angle);
const float s = Math::sin(angle);
points_ptr[i * 2].x = c * p_radius;
points_ptr[i * 2].y = s * p_radius;
points_ptr[i * 2].x = c * p_major;
points_ptr[i * 2].y = s * p_minor;
points_ptr[i * 2] += p_pos;
points_ptr[i * 2 + 1].x = c * (p_radius + border_size);
points_ptr[i * 2 + 1].y = s * (p_radius + border_size);
points_ptr[i * 2 + 1].x = c * (p_major + border_size);
points_ptr[i * 2 + 1].y = s * (p_minor + border_size);
points_ptr[i * 2 + 1] += p_pos;
colors_ptr[i * 2] = p_color;
@@ -1520,6 +1520,10 @@ void RendererCanvasCull::canvas_item_add_circle(RID p_item, const Point2 &p_pos,
}
}
void RendererCanvasCull::canvas_item_add_circle(RID p_item, const Point2 &p_pos, float p_radius, const Color &p_color, bool p_antialiased) {
canvas_item_add_ellipse(p_item, p_pos, p_radius, p_radius, p_color, p_antialiased);
}
void RendererCanvasCull::canvas_item_add_texture_rect(RID p_item, const Rect2 &p_rect, RID p_texture, bool p_tile, const Color &p_modulate, bool p_transpose) {
Item *canvas_item = canvas_item_owner.get_or_null(p_item);
ERR_FAIL_NULL(canvas_item);